c @@ -1531,7 +1531,7. 1 - Still Gives Kernel Compile Warnings. # yum install kvm Loaded plugins: rhnplugin, security Setting up Install Process Resolving Dependencies --> Running transaction check ---> Package kvm. He discovered that SMRAM accesses can be duped to read/write from the LAPIC instead of main memory, bypassing a. In this case, *bitmap would be: 881 * zero and *dst undefined. Avi Kivity wrote: > On 08/17/2011 07:19 AM, Liu, Jinsong wrote: >> From. To view detailed information about a specific kernel module, use the modinfo MODULE_NAME command, where MODULE_NAME is the name. I wont tell more here, since excellent lectures already exists: see lwn here and here. KVM did the wrong thing by advertising a feature it doesn’t support. A privileged guest user could use this flaw to crash the host. c in the Linux kernel through 4. c @@ -1531,7 +1531,7. arch/x86/kvm/lapic. The second important point for writing this article for me was the fact that I'm using. SMBIOS version 2. [v3,3/5] KVM: LAPIC: Expose per-vCPU timer_advance_ns to userspace 1087540 diff mbox series. c Wanpeng Li (5): KVM. * [PATCH v2 1/2] KVM: X86: Filter out the broadcast dest for IPI fastpath @ 2020-04-01 0:19 Wanpeng Li 2020-04-01 0:19 ` [PATCH v2 2/2] KVM: LAPIC: Don't need to clear IPI delivery status in x2apic mode Wanpeng Li 0 siblings, 1 reply; 8+ messages in thread From: Wanpeng Li @ 2020-04-01 0:19 UTC (permalink / raw) To: linux-kernel, kvm Cc: Paolo. The test case is the following script: qemu-system-x86_64 -machine accel=kvm -pidfile /tmp/pid$$ -m 512M -smp 8,sockets=8 -kernel vmlinuz -append "init=/sbin/reboot -f console=ttyS0,115200 kgdboc=ttyS2,115200 root=/dev/sda rw" -nographic -serial stdio -drive format=raw,snapshot=on,file. 5 allows guest OS users to cause a denial of service (host OS crash) via a crafted ICR write operation in x2apic mode. 306246] kvm: vcpu 0: requested 292092 ns lapic timer period limited to 500000 ns [12341. 4869691 100644--- a/arch/x86/kvm/lapic. Development Tools: git, gcc[-c++], [auto]make, iasl, kernel-devel, etc. - KVM: x86: Protect kvm_lapic_reg_write() from Spectre-v1/L1TF attacks - btrfs: flush write bio if we loop in extent_write_cache_pages - KVM: x86/mmu: Apply max PA check for MMIO sptes to 32-bit KVM - KVM: VMX: Add non-canonical check on writes to RTIT address MSRs. Mitigations to the "Memory Sinkhole" TL;DR Domas' "Memory Sinkhole" is a clever attack, but in today's OS landscape, can be mitigated via a small software update. Build real time cloud 3. [Qemu-devel] [PATCH 1/2] KVM: emulate lapic tsc deadline timer for guest, Liu, Jinsong, 2011/09/13. From: Wanpeng Li <> Subject [PATCH v7 0/2] KVM: LAPIC: Implement Exitless Timer: Date: Sat, 6 Jul 2019 09:26:49 +0800. Note that this list may be incomplete. An example of LAPIC virtualization via software emulation can be found here. Avi Kivity wrote: > On 08/17/2011 07:19 AM, Liu, Jinsong wrote: >> From. ; I need to produce a preemption timer interrupt (counts to 0) and wake up the guest into active-state. And I'm 99% certain "vcpu->arch. 1) Enable APICv feature in kvm. This adds a mechanism for exposing the virtual apic tpr to the guest, and a protocol for letting the guest update the tpr without causing a vmexit if conditions allow (e. KVM: x86: Protect kvm_lapic_reg_write() from Spectre-v1/L1TF attacks (bsc#1164730). c − Maintains virtual APIC state in "APIC Register Page" (defined in kvm_lapic structure), i. As its name suggests, the APIC is more advanced than Intel's 8259 Programmable Interrupt Controller (PIC), particularly enabling the construction of multiprocessor systems. c in the Linux kernel through 4. Another Latency Post. #define KVM_RUN _IO(KVMIO, 0x80) #define KVM_GET_REGS _IOR(KVMIO, 0x81, struct kvm_regs) #define KVM_SET_REGS _IOW(KVMIO, 0x82, struct kvm_regs) #define KVM_GET_SREGS _IOR(KVMIO, 0x83, struct kvm_sregs) #define KVM_SET_SREGS _IOW(KVMIO, 0x84, struct kvm_sregs) #define KVM_TRANSLATE _IOWR(KVMIO, 0x85, struct kvm_translation) #define KVM_INTERRUPT _IOW(KVMIO, 0x86, struct kvm_interrupt) /* KVM. We know that in software emulation, for every guest-interrupt a VM-exit is needed, this is a very remarkable overhead for virtualization. x86: - Hyper-V VMBus hypercall userspace exit - alternative implementation of lowest-priority interrupts using vector hashing (for better VT-d posted interrupt support) - fixed guest debugging with nested virtualizations - improved interrupt tracking in the in-kernel IOAPIC - generic infrastructure for tracking writes to guest memory. 306246] kvm: vcpu 0: requested 292092 ns lapic timer period limited to 500000 ns [12341. c in the Linux kernel through 4. Have installed the system-config-kdump package to add a reserve allocation for the kdump service, however the allocation doesnt take following a system restart. KVM: x86: fix LAPIC pending count calculation (cherry picked from b682b814) Simplify LAPIC TMCCT calculation by using hrtimer provided function to query remaining time until expiration. h, line 82 (as a prototype) Referenced in 4 files: arch/x86/kvm/lapic. Re: [Qemu-devel] [PATCH 1/2] KVM: emulate lapic tsc deadline timer for guest, Marcelo Tosatti, 2011/09/14. 重构 KVM LAPIC Timer 的模式切换和频率调整的模拟,使其完全与硬件行为保持一致。优化 KVM LAPIC Timer 时钟中断注入的延迟。发现并解决了使用硬件辅助的 VMX Preemption Timer 模拟的 KVM LAPIC Timer 时的各种抢占问题。 嵌套虚拟化方面重构异常注入的逻辑。. 12 CVE-2018-18955: 20: Bypass 2018-11-16: 2019-04-16. there is no interrupt pending with a higher priority than the new tpr). A divide-by-zero flaw was found in the apic_get_tmcct() function in KVM's Local Advanced Programmable Interrupt Controller (LAPIC) implementation. Re: [Qemu-devel] [PATCH 1/2] KVM: emulate lapic tsc deadline timer for guest, Liu, Jinsong, 2011/09/15. Whenever I do some heavy traffic on the guest install, the system locks up, network stops to respond. Current Description. com, [email protected] KVM Forum 2012 Enabling APIC-Register Virtualization in KVM 12 • What KVM does in software today: − Handled by lapic. 1 Generator usage only permitted with license. Background 2. h in the Linux kernel through 4. c index 707ca9c. I will notify my Lead about it. c에 정의 된 리눅스 커널 함수인 vcpu_scan_ioapic에 존재합니다. Never schedule! •defeat the purpose of CPU overcommit in cloud companies •some cloud management program will monitor pCPU usage and do the •Both of LAPIC timer tsc deadline mode and periodic/oneshot mode can utilize VMX Preemption timer currently. Actually, these emulated timers can be offload to the housekeeping cpus since APICv is really common in recent years. A privileged guest user could use this flaw to crash the host. 1 - Still Gives Kernel Compile Warnings. 2] - [infiniband] core: Prevent integer overflow in ib_umem_get address arithmetic (Doug Ledford) [1181173 1179327] {CVE-2014-8159} [2. c @@ -1531,7 +1531,7. However, examining it from QEMU console, I can only find the value 0 there: (qemu) x/128b 0xfee00000 fee00000: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 fee00008: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 fee00010: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 fee00018: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 fee00020. I wont tell more here, since excellent lectures already exists: see lwn here and here. 0 0 kvm_vcpu_wakeup 15886 15458 kvm_wait_lapic_expire 0 0 kvm_write_tsc_offset 0. de, [email protected] A NULL pointer dereference security flaw was found in the Linux kernel in kvm_pv_send_ipi() in arch/x86/kvm/lapic. Re: [Qemu-devel] [PATCH 1/2] KVM: emulate lapic tsc deadline timer for guest, Marcelo Tosatti. In case of no APICv virtual interrupt delivery support, vLAPIC requires EOI from Guest OS whenever a vector was acknowledged and processed by guest. 7-rc1 Tree: Mainline Regression: No Attachments kernel config (171. ” instead of talking about buggy guests, as it may confuse future. apic->vapic_addr variable to compute the offset in a memory page. 5 allows guest OS users to cause a denial of service (host OS crash) via a crafted ICR write operation in x2apic mode. virtualization_kvm URL: Keywords: Depends on: Blocks: Reported: 2020-04-17 03:21 UTC by sun hao: Modified: 2020-04-19 13:06 UTC CC List: 1 user See Also: Kernel Version: 5. 977195] rcu: (detected by 0, t=2102 jiffies, g=51977, q=3) [ 1705. 1 01/01/2007 Hypervisor detected: KVM e820 update range: 0000000000000000 - 0000000000001000 (usable) ==> (reserved) e820 remove range: 00000000000a0000 - 0000000000100000 (usable) last_pfn = 0x120000 max_arch_pfn = 0x400000000 MTRR default type: write-back MTRR fixed ranges enabled: 00000. SynIC (synthetic interrupt controller) is a lapic extension, which is controlled via MSRs and maintains for each vCPU - 16 synthetic interrupt "lines" (SINT's); each can be configured to trigger a specific interrupt vector optionally with auto-EOI semantics - a message page in the guest memory with 16 256-byte per-SINT message slots - an event flag page in the guest memory with 16 2048-bit per. 983152] rcu: All QSes seen, last rcu_sched kthread activity 2102 (140596-138494), jiffies_till_next_fqs=1, root. c @@ -128,6 +128,17. | Patch ID: 171284 Details. 이 결점은 I/O APIC(Advanced Programmable Interrupt Controller)가 적절히 초기화 되지 않았을 때 촉발 됩니다. From: Steve Rutherford In order to enable userspace PIC support, the userspace PIC needs to be able to inject local interrupts even when the APICs are in the kernel. The installation system recognizes a few additional boot parameters [4] which may be useful. Note: This is a -git package and the version will automatically update to the latest commit when it is run, having pulled down the branch from the repository. conf has been modified with. The flaw is triggered when the Advanced Programmable Interrupt Controller (APIC) map does not initialize correctly. KVM: x86: fix LAPIC pending count calculation (cherry picked from b682b814 ) Simplify LAPIC TMCCT calculation by using hrtimer provided function to query remaining time until expiration. KVM Forum 2012 Enabling APIC-Register Virtualization in KVM 12 • What KVM does in software today: − Handled by lapic. KVM: x86: Protect kvm_hv_msr_[get|set]_crash_data() from Spectre-v1/L1TF attacks (bsc#1164712). 4) At the main console, run the command sar (system activity report) to collect the percentage CPU utilization. Cc: Paolo Bonzini Cc: Radim Krčmář Cc: Liran Alon Signed-off-by: Wanpeng Li --- v1 -> v2: * converts between guest TSC units to host nanoseconds correctly * put hard-coded numbers to #define arch/x86/kvm/lapic. As its name suggests, the APIC is more advanced than Intel's 8259 Programmable Interrupt Controller (PIC), particularly enabling the construction of multiprocessor systems. * [PATCH 0/2] KVM: VMX: Tscdeadline timer emulation fastpath @ 2020-04-21 11:20 Wanpeng Li 2020-04-21 11:20 ` [PATCH 1/2] KVM: X86: TSCDEADLINE MSR" Wanpeng Li 2020-04-21 11:20 ` [PATCH 2/2] KVM: VMX: Handle preemption timer fastpath Wanpeng Li 0 siblings, 2 replies; 9+ messages in thread From: Wanpeng Li @ 2020-04-21 11:20 UTC (permalink / raw. The last version of the linux-git package was disowned and deleted. diff --git a/arch/x86/kvm/lapic. h, line 82 (as a prototype) Referenced in 4 files: arch/x86/kvm/lapic. Re: [Qemu-devel] [PATCH 1/2] KVM: emulate lapic tsc deadline timer for guest, Liu, Jinsong, 2011/09/15. KVM has several different ways it can provide the lapic counter and I'm not sure which one I'm using yet. If the kernel is compiled with CONFIG_PREEMPT_VOLUNTARY and OP-TEE is executing a long running workload, the following errors are raised: [ 1705. Signed-off-by: Marcelo Tosatti Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity Signed-off-by: Greg Kroah-Hartman. c (bsc#1164733). Cc: Paolo Bonzini Cc: Radim Krčmář Cc: Liran Alon Signed-off-by: Wanpeng Li --- v1 -> v2: * converts between guest TSC units to host nanoseconds correctly * put hard-coded numbers to #define arch/x86/kvm/lapic. Background 2. 重构 KVM LAPIC Timer 的模式切换和频率调整的模拟,使其完全与硬件行为保持一致。优化 KVM LAPIC Timer 时钟中断注入的延迟。发现并解决了使用硬件辅助的 VMX Preemption Timer 模拟的 KVM LAPIC Timer 时的各种抢占问题。 嵌套虚拟化方面重构异常注入的逻辑。. 424652] NMI watchdog: Watchdog detected hard LOCKUP on cpu 6 [ 7234. config Mathias Nyman (1): xhci: apply XHCI_PME_STUCK_QUIRK to Intel Comet Lake platforms Miaohe Lin (1): KVM: apic: avoid calculating pending eoi from an uninitialized val Mike Jones (1): hwmon: (pmbus/ltc2978) Fix PMBus polling of MFR_COMMON definitions. diff --git a/arch/x86/kvm/lapic. The kvm API is centered around file descriptors. 9 set to be updated --> Processing Dependency: kmod-kvm for package: kvm --> Running transaction check ---> Package kmod-kvm. In this case, *bitmap would be: 881 * zero and *dst undefined. The first kvm releases its file in the directory drivers/kvm/, but since around December 2007 it is pushed into virt/kvm directory in the kernel source tree. perf kvm --host top -p `pidof qemu-system-x86_64` It will show how often qemu is executing various functions. 5) Increase the number of running VMs by one and repeat the above steps starting from step 3. From: Srivatsa Vaddagiri. A privileged guest user could use this flaw to crash the host. 5, kernel is 3. The Module column lists the names of the loaded modules, while the Size column displays the size of each module. int kvm_lapic_reg_read(struct kvm_lapic *apic, u32 offset, int len, 1318: void *data) 1319 {1320: unsigned char alignment = offset & 0xf; 1321: u32 result; 1322. Current Description. 2 allows local users to cause a denial of service (NULL pointer dereference and BUG) via crafted system calls that reach a situation where the apic map is uninitialized. x86: - Hyper-V VMBus hypercall userspace exit - alternative implementation of lowest-priority interrupts using vector hashing (for better VT-d posted interrupt support) - fixed guest debugging with nested virtualizations - improved interrupt tracking in the in-kernel IOAPIC - generic infrastructure for tracking writes to guest memory. c (bsc#1164733). When used as a virtualizer, QEMU. Is there anybody out there who got a custom Slackware 14. 5 guest boot failure using in-kernel PIT From: Eduardo Habkost Date: 2008-11-20 14:22:53 Message-ID: 20081120142253. c | 25 +++++- arch/x86/kvm/x86. h, line 82; arch/x86/kvm/svm. c +++ b/arch/x86/kvm/lapic. Yes I RTFM, I've done all of the typical tweaking. There is also one function used for making the switch to guest space and it accounts for all time spent there. I did search lots but I did not find any material about. I also have centos6 32bit in as kvm virtual guest - guest install. KVM Forum 2012 Enabling APIC-Register Virtualization in KVM 12 • What KVM does in software today: − Handled by lapic. The second important point for writing this article for me was the fact that I'm using. appspotmail. Intel Atom Processor C3758, Single Socket FCBGA1310 supported, CPU TDP support 25W. This patch adds support for switching in and out of system management mode, respectively upon receiving KVM_REQ_SMI and upon executing a RSM instruction. 17-rc4 , to see if there was any improvement in the horde of warnings generated with 8. Welcome to the Project ACRN (version latest) documentation. Hi all, I can reproduce this with kernel 3. Avi Kivity wrote: > On 08/17/2011 07:19 AM, Liu, Jinsong wrote: >> From. There is also one function used for making the switch to guest space and it accounts for all time spent there. Should you really need to debug two machines at a time, it is possible to create a dedicated serial port per process. A guest OS user could exploit this flaw to. timer_advance_ns' to userspace * move the tracepoint below guest_exit_irqoff() * move wait_lapic_expire() before flushing the L1 v1 -> v2: * fix indent in patch 1/4 * remove the wait_lapic_expire() tracepoint and expose by debugfs * move the call to wait_lapic_expire() into vmx. Parameters: struct kvm_lapic_state (out) Returns: 0 on success, -1 on error: #define KVM_APIC_REG_SIZE 0x400: struct kvm_lapic_state {char regs[KVM_APIC_REG_SIZE];}; Reads the Local APIC registers and copies them into the input argument. Configure Open vSwitch, DPDK and vhost-user in real time environment 4. Have installed the system-config-kdump package to add a reserve allocation for the kdump service, however the allocation doesnt take following a system restart. 4) At the main console, run the command sar (system activity report) to collect the percentage CPU utilization. Development Tools: git, gcc[-c++], [auto]make, iasl, kernel-devel, etc. 4 GbE LAN ports. x86: - Hyper-V VMBus hypercall userspace exit - alternative implementation of lowest-priority interrupts using vector hashing (for better VT-d posted interrupt support) - fixed guest debugging with nested virtualizations - improved interrupt tracking in the in-kernel IOAPIC - generic infrastructure for tracking writes to guest memory. Several different components must successfully interact with each other to facilitate running Mac OS X as a QEMU/KVM guest. int kvm_lapic_find_highest_irr(struct kvm_vcpu *vcpu); void kvm_apic_timer_intr_post(struct kvm_vcpu *vcpu, int vec); +void kvm_lapic_set_vapic_addr(struct kvm_vcpu *vcpu, gpa_t vapic_addr);. 1-rc2 Powered by Code Browser 2. - KVM: x86: Protect kvm_lapic_reg_write() from Spectre-v1/L1TF attacks - btrfs: flush write bio if we loop in extent_write_cache_pages - KVM: x86/mmu: Apply max PA check for MMIO sptes to 32-bit KVM. A divide-by-zero flaw was found in the apic_get_tmcct() function in KVM's Local Advanced Programmable Interrupt Controller (LAPIC) implementation. 1: Epoch: 10: Summary: QEMU is a machine emulator and virtualizer: Description: qemu-kvm-ev is an open source virtualizer that provides hardware emulation for the KVM hypervisor. Welcome to the Project ACRN (version latest) documentation. kvm: x86: MMU: Remove unused parameter parent_pte from kvm_mmu_get_page() (bsc#1117665). 5) Increase the number of running VMs by one and repeat the above steps starting from step 3. Several different components must successfully interact with each other to facilitate running Mac OS X as a QEMU/KVM guest. Re: [Qemu-devel] [PATCH 1/2] KVM: emulate lapic tsc deadline timer for guest, Marcelo Tosatti. From: Wanpeng Li <> Subject [PATCH v7 0/2] KVM: LAPIC: Implement Exitless Timer: Date: Sat, 6 Jul 2019 09:26:49 +0800. However, KVM always makes lapic timer pinned to the pCPU which vCPU residents, the reason is explained by commit 61abdbe0 (kvm: x86: make lapic hrtimer pinned). * Do not abbreviate AVIC vmexit function and structure names. For some reason, I have to set up a case: when the guest run in non-root operations, I need to change the activity state of the guest into shutdown-state. 1 01/01/2007 Hypervisor detected: KVM e820 update range: 0000000000000000 - 0000000000001000 (usable) ==> (reserved) e820 remove range: 00000000000a0000 - 0000000000100000 (usable) last_pfn = 0x120000 max_arch_pfn = 0x400000000 MTRR default type: write-back MTRR fixed ranges enabled: 00000. A NULL pointer dereference security flaw was found in the Linux kernel in kvm_pv_send_ipi() in arch/x86/kvm/lapic. c에 정의 된 리눅스 커널 함수인 vcpu_scan_ioapic에 존재합니다. QEMU-KVM has a bug where the interruptibility of the CPU is predicated on pending interrupts. SynIC (synthetic interrupt controller) is a lapic extension, which is controlled via MSRs and maintains for each vCPU - 16 synthetic interrupt "lines" (SINT's); each can be configured to trigger a specific interrupt vector optionally with auto-EOI semantics - a message page in the guest memory with 16 256-byte per-SINT message slots - an event flag page in the guest memory with 16 2048-bit per. 882 */ 883: static inline bool kvm_apic_map_get_dest_lapic(struct kvm *kvm, 884:. Re: [PATCH v2 4/4] KVM: LAPIC: Don't silently accept bad vectors From: Wanpeng Li Date: Wed Oct 04 2017 - 03:56:30 EST Next message: Greg Kroah-Hartman: "Re: [PATCH 4. This adds a mechanism for exposing the virtual apic tpr to the guest, and a protocol for letting the guest update the tpr without causing a vmexit if conditions allow (e. [v3,3/5] KVM: LAPIC: Expose per-vCPU timer_advance_ns to userspace 1087540 diff mbox series. CVE-2015-4692: Description: The kvm_apic_has_events function in arch/x86/kvm/lapic. loaded kernel is 4. 983152] rcu: All QSes seen, last rcu_sched kthread activity 2102 (140596-138494), jiffies_till_next_fqs=1, root. The Kernel-based Virtual Machine, or kvm, is a new Linux subsystem which leverages these virtualization extensions to add a virtual machine monitor (or hyper-visor) capability to Linux. The downside is that it's oscillating at (one of) the CPU's frequencies, which varies from machine to machine, while the PIT uses a standard frequency. E433: No tags file E426: tag not found: kvm_lapic_enabled So I guess that in the first case, vim used the tag file generated by gtags to locate the function and learned that it is defined in arch/x86/kvm/lapic. [PATCH next] kvm: Use pr_ From: Joe Perches Date: Wed Jun 13 2012 - 23:20:24 EST Next message: Vinod Koul: "Re: [PATCH] dma: coh901318: use devm allocation" Previous message: Tejun Heo: "Re: Early boot panic on machine with lots of memory" Messages sorted by:. There is also one function used for making the switch to guest space and it accounts for all time spent there. Hi all, I can reproduce this with kernel 3. org, [email protected] Build real time cloud 3. Only one QEMU at a time can handle -s. c source file, which may use the vcpu->arch. c − Maintains virtual APIC state in "APIC Register Page" (defined in kvm_lapic structure), i. 3 allows local users to cause a denial of service (NULL pointer dereference and system crash) or possibly have unspecified other impact by leveraging /dev/kvm access for an ioctl call. Avi Kivity wrote: > On 08/17/2011 07:19 AM, Liu, Jinsong wrote: >> From. Note: This is a -git package and the version will automatically update to the latest commit when it is run, having pulled down the branch from the repository. 5, kernel is 3. 1 VM running at full-virtualization under KVM Linode and booting with GRUB 2 ? Whatever i do, the GRUB boot results in kernel panic - while unfortunately Lish doesn't provide enough info to get a clue what went wrong early on in the boot process. QEMU can use other hypervisors like Xen or KVM to use CPU extensions ( HVM) for virtualization. The register layout is same as actual local APIC −void *regs;! • Changes for APIC-Register. KVM in the Linux kernel on Power8 processors has a conflicting use of HSTATE_HOST_R1 to store r1 state in kvmppc_hv_entry plus in kvmppc_{save,restore}_tm, leading to a stack corruption. The Used by column shows the number of referring modules and their names. From <> Subject [PATCH] KVM: LAPIC: Mark hrtimer for period or oneshot mode to expire in hard interrupt context: Date: Fri, 20 Mar 2020 15:06:07 +0800. com [email protected] Several different components must successfully interact with each other to facilitate running Mac OS X as a QEMU/KVM guest. However, KVM always makes lapic timer pinned to the pCPU which vCPU residents, the reason is explained by commit 61abdbe0 (kvm: x86: make lapic hrtimer pinned). I've checked the params of the disk with sdparm and write cache is enabled, is there anything else I can do to improve the w. See the note in KVM_GET_LAPIC. Here is a brief introduction of some registers: IRR: Interrupt Request Register, if the nth bit is set, the LAPIC has received the nth interrupt but. KVM Forum 2012 Enabling APIC-Register Virtualization in KVM 12 • What KVM does in software today: − Handled by lapic. c − Maintains virtual APIC state in "APIC Register Page" (defined in kvm_lapic structure), i. c in the Linux kernel through 4. In case of no APICv virtual interrupt delivery support, vLAPIC requires EOI from Guest OS whenever a vector was acknowledged and processed by guest. c @@ -1531,7 +1531,7. KVM is not KVM First of all there is QEMU then KVM then Libvirt then the whole ecosystems. Project ACRN documentation¶. Is this the correct linux kernel code to modify - how can i make the change to emulate CPUID code and which function i need to change. They also virtualize all guest interrupts. c, line 2028 (as a variable) arch/x86/kvm/lapic. 2 Form Factor: 2242, 2280. [Qemu-devel] [PATCH 1/2] KVM: emulate lapic tsc deadline timer for guest, Liu, Jinsong <=. I Just Want It Working, Right Now ! OK, here's what you'll need (or skip to the technical details instead):. Never schedule! •defeat the purpose of CPU overcommit in cloud companies •some cloud management program will monitor pCPU usage and do the •Both of LAPIC timer tsc deadline mode and periodic/oneshot mode can utilize VMX Preemption timer currently. x86: - Hyper-V VMBus hypercall userspace exit - alternative implementation of lowest-priority interrupts using vector hashing (for better VT-d posted interrupt support) - fixed guest debugging with nested virtualizations - improved interrupt tracking in the in-kernel IOAPIC - generic infrastructure for tracking writes to guest memory. The kvm_apic_has_events function in arch/x86/kvm/lapic. appspotmail. KVM: x86: Protect kvm_lapic_reg_write() from Spectre-v1/L1TF attacks (bsc#1164730). 3 allows local users to cause a denial of service (NULL pointer dereference and system crash) or possibly have unspecified other impact by leveraging /dev/kvm access for an ioctl call. Because of this, an attacker with the ability run code in kernel space of a guest VM can cause the host kernel to panic. However, KVM always makes lapic timer pinned to the pCPU which vCPU residents, the reason is explained by commit 61abdbe0 (kvm: x86: make lapic hrtimer pinned). there is no interrupt pe. */ static inline bool kvm_apic_map_get_dest_lapic. •Normal KVM host converts the host's vector to the guest's vector •For Direct IRQ, PCI devices must be + direct IRQ/EOI/LAPIC patch -Guest: Linux-3. host_pkru = read_pkru()" can be moved to kvm_arch_vcpu_load(). Therefore I think that you should change the comment to something like “KVM’s in-kernel IOAPIC doesn’t support Directed EOI register, so don’t advertise this capability in the LAPIC Version Register. QEMU can use other hypervisors like Xen or KVM to use CPU extensions ( HVM) for virtualization. ID: 22232: Package Name: qemu-kvm-ev: Version: 2. This needs some special awareness into existing interrupr injection path: -. c +++ b/arch/x86/kvm/lapic. The register layout is same as actual local APIC −void *regs;! • Changes for APIC-Register. Unlike all of the other cpuid bits, the TSC deadline timer bit is set unconditionally, regardless of what userspace wants. Xen does >>> not enable preemption timer for HVM guests, and will get panic if it. Note that this list may be incomplete. See bank memory available: Start End Size Type 0x0 0x9fbff 654336 1 0x9fc00 0x9ffff 1024 2 0xf0000 0xfffff 65536 2 0x100000 0xfdffff 15597568 1 0xfe0000 0xffffff 131072 2 0xfffc0000 0xffffffff 362144 2. See what happened with real time kvm when building real time cloud [email protected] 9 set to be updated --> Processing Dependency: kmod-kvm for package: kvm --> Running transaction check ---> Package kmod-kvm. From <> Subject [PATCH] KVM: LAPIC: Mark hrtimer for period or oneshot mode to expire in hard interrupt context: Date: Fri, 20 Mar 2020 15:06:07 +0800. 2 allows local users to cause a denial of service (NULL pointer dereference and BUG) via crafted system calls that reach a situation where the apic map is uninitialized. The recalculate_apic_map function in arch/x86/kvm/lapic. kvm: x86: Reduce the overhead when lapic_timer_advance is disabled (bsc#1149083). The second important point for writing this article for me was the fact that I'm using. KVM: x86: fix LAPIC pending count calculation (cherry picked from b682b814 ) Simplify LAPIC TMCCT calculation by using hrtimer provided function to query remaining time until expiration. A divide-by-zero flaw was found in the apic_get_tmcct() function in KVM's Local Advanced Programmable Interrupt Controller (LAPIC) implementation. --- a/arch/x86/kvm/lapic. * Simplify AVIC backing page allocation to use the emulated lapic register page. E433: No tags file E426: tag not found: kvm_lapic_enabled So I guess that in the first case, vim used the tag file generated by gtags to locate the function and learned that it is defined in arch/x86/kvm/lapic. kvm: vmx: Introduce lapic_mode enumeration kvm: vmx: Basic APIC virtualization controls have three settings kvm: nVMX: Eliminate APIC access page sharing between L1 and L2 kvm: mmu: Add guest_mode to kvm_mmu_page_role kvm: mmu: Don't expose private memslots to L2 kvm: nVMX: Use nested_run_pending rather than from_vmentry. h, line 82 (as a prototype) Referenced in 4 files: arch/x86/kvm/lapic. If the reason that a CPU is interrupted is because we need to inject interrupts, the current code will just keep looping and miss the event window. ” instead of talking about buggy guests, as it may confuse future. h in the Linux kernel through 4. A Comprehensive Implementation and Evaluation of Direct Interrupt Delivery x86 timer is located in the per-core local APIC registers KVM virtualizes LAPIC timer toVM. 1 - Still Gives Kernel Compile Warnings. ] for user space. However, KVM always makes lapic timer pinned to the pCPU which vCPU residents, the reason is explained by commit 61abdbe0 (kvm: x86: make lapic hrtimer pinned). However, > > it just hidden the time. bool kvm_apic_match_dest (struct kvm_vcpu *vcpu, struct kvm_lapic *source, int short_hand, unsigned int dest, int dest_mode) struct kvm_lapic *target = vcpu-> arch. There is also one function used for making the switch to guest space and it accounts for all time spent there. Virtual interrupt delivery avoids KVM to inject vAPIC interrupts manually, which is fully taken care of by the hardware. arch/x86/kvm/lapic. Actually, these emulated timers can be offload to the housekeeping cpus since APICv is really common in recent years. Is this the correct linux kernel code to modify - how can i make the change to emulate CPUID code and which function i need to change. - around 8500 cycles between later kvm_vcpu_kick and kvm_sched_in. 971228] rcu: INFO: rcu_sched detected stalls on CPUs/tasks: [ 1705. You can rate examples to help us improve the quality of examples. | Patch ID: 171284 Details. Source: MITRE. There is also one function used for making the switch to guest space and it accounts for all time spent there. Because of this, there is no need for any resource management, which makes things easier. 5, kernel is 3. arch/x86/kvm/lapic. So an okay-ish solution is to turn off preemption in the function. x86: - Hyper-V VMBus hypercall userspace exit - alternative implementation of lowest-priority interrupts using vector hashing (for better VT-d posted interrupt support) - fixed guest debugging with nested virtualizations - improved interrupt tracking in the in-kernel IOAPIC - generic infrastructure for tracking writes to guest memory. KVM: x86: Protect MSR-based index computations from Spectre-v1/L1TF attacks in x86. KVM: x86: Protect kvm_lapic_reg_write() from Spectre-v1/L1TF attacks (bsc#1164730). 4 @ 0xFD9F0 DMI: Red Hat KVM, BIOS 0. Several different components must successfully interact with each other to facilitate running Mac OS X as a QEMU/KVM guest. config Mathias Nyman (1): xhci: apply XHCI_PME_STUCK_QUIRK to Intel Comet Lake platforms Miaohe Lin (1): KVM: apic: avoid calculating pending eoi from an uninitialized val Mike Jones (1): hwmon: (pmbus/ltc2978) Fix PMBus polling of MFR_COMMON definitions. there is no interrupt pe. perf kvm --host top -p `pidof qemu-system-x86_64` It will show how often qemu is executing various functions. Signed-off-by: Marcelo Tosatti Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity Signed-off-by: Greg Kroah-Hartman. Painting is an illusion, a piece of magic, so what you see is not what you see. 1 VM running at full-virtualization under KVM Linode and booting with GRUB 2 ? Whatever i do, the GRUB boot results in kernel panic - while unfortunately Lish doesn't provide enough info to get a clue what went wrong early on in the boot process. I also got help from Cisco TAC and they said like you. KVM did the wrong thing by advertising a feature it doesn’t support. Background 2. All of these devices can be implemented in qemu or in kvm all pic and io-apic in qemu and lapic in kvm. 12 CVE-2018-18955: 20: Bypass 2018-11-16: 2019-04-16. Current Description. c b/arch/x86/kvm/lapic. kvm: x86: MMU: Remove unused parameter parent_pte from kvm_mmu_get_page() (bsc#1117665). x86: - Hyper-V VMBus hypercall userspace exit - alternative implementation of lowest-priority interrupts using vector hashing (for better VT-d posted interrupt support) - fixed guest debugging with nested virtualizations - improved interrupt tracking in the in-kernel IOAPIC - generic infrastructure for tracking writes to guest memory. 32-2-amd64: KVM linux guests oops in kvm_leave_lazy_mmu on boot From : Vadim Solomin < [email protected] c index af38ece. If the kernel is compiled with CONFIG_PREEMPT_VOLUNTARY and OP-TEE is executing a long running workload, the following errors are raised: [ 1705. ACRN is a flexible, lightweight reference hypervisor, built with real-time and safety-criticality in mind, optimized to streamline embedded development through an open source platform. A local attacker could exploit this vulnerability by providing a crafted vapic_addr value that is at the end of a. 0 kvm:kvm_hv_notify_acked_sint. c +++ b/arch/x86/kvm/lapic. 12 SATA3 (6 Gbps) ports. Needs proc_priocntl privilege:. Cc: Paolo Bonzini Cc: Radim Krčmář Cc: Liran Alon Signed-off-by: Wanpeng Li --- v1 -> v2: * converts between guest TSC units to host nanoseconds correctly * put hard-coded numbers to #define arch/x86/kvm/lapic. Re: [Qemu-devel] [PATCH 1/2] KVM: emulate lapic tsc deadline timer for guest, Marcelo Tosatti, 2011/09/14. kvm_pv_send_ipi in arch/x86/kvm/lapic. 196459] kvm: vcpu 0: requested 100012 ns lapic timer period limited to 500000 ns [12341. - KVM: x86: Protect kvm_lapic_reg_write() from Spectre-v1/L1TF attacks - btrfs: flush write bio if we loop in extent_write_cache_pages - KVM: x86/mmu: Apply max PA check for MMIO sptes to 32-bit KVM - KVM: VMX: Add non-canonical check on writes to RTIT address MSRs. h, line 82 (as a prototype) Referenced in 4 files: arch/x86/kvm/lapic. The Kernel-based Virtual Machine, or kvm, is a new Linux subsystem which leverages these virtualization extensions to add a virtual machine monitor (or hyper-visor) capability to Linux. int kvm_lapic_find_highest_irr(struct kvm_vcpu *vcpu); void kvm_apic_timer_intr_post(struct kvm_vcpu *vcpu, int vec); +void kvm_lapic_set_vapic_addr(struct kvm_vcpu *vcpu, gpa_t vapic_addr);. Here is a brief introduction of some registers: IRR: Interrupt Request Register, if the nth bit is set, the LAPIC has received the nth interrupt but. kvm: x86: adjust kvm_mmu. KVM: x86: fix LAPIC pending count calculation (cherry picked from b682b814 ) Simplify LAPIC TMCCT calculation by using hrtimer provided function to query remaining time until expiration. The great benefit of the Local APIC timer is that it is hardwired to each CPU core, unlike the Programmable Interval Timer which is a separate circuit. On Thu, 16 May 2019 at 01:42, Sean Christopherson wrote: > > On Wed, May 15, 2019 at 12:11:54PM +0800, Wanpeng Li wrote: > > From: Wanpeng Li > > > > Advance lapic timer tries to hidden the hypervisor overhead between the > > host emulated timer fires and the guest awares the timer is fired. 971228] rcu: INFO: rcu_sched detected stalls on CPUs/tasks: [ 1705. 17-rc4 , to see if there was any improvement in the horde of warnings generated with 8. A guest OS user could exploit this flaw to. 983152] rcu: All QSes seen, last rcu_sched kthread activity 2102 (140596-138494), jiffies_till_next_fqs=1, root. The output is divided into three columns. kvm_pv_send_ipi in arch/x86/kvm/lapic. 3) Ssh to execute Iozone an all running VMs. 1 Generator usage only permitted with license. de, [email protected] bool kvm_intr_is_single_vcpu(struct kvm *kvm, struct kvm_lapic_irq *irq, struct kvm_vcpu **dest_vcpu) diff --git a/arch/x86/kvm/lapic. c | 2 +- 2. KVM: x86: save/load state on SMM switch The big ugly one. com [email protected] 4: KVM: LAPIC: Mark hrtimer for period or oneshot mode to expire in hard interrupt context Submitted by Bruce Ashfield on March 24, 2020, 11:05 p. Copy the struct by value to set the ops during kvm_init(). Replace the kvm_x86_ops pointer in common x86 with an instance of the struct to save one memory instance when invoking function. diff --git a/arch/x86/kvm/lapic. Have installed the system-config-kdump package to add a reserve allocation for the kdump service, however the allocation doesnt take following a system restart. Using several QEMU at same time. c | 25 +++++- arch/x86/kvm/x86. APIC is OK but bank memory @ 0xfee00000 (for LAPIC) is not here (no HPET too). Mitigations to the "Memory Sinkhole" TL;DR Domas' "Memory Sinkhole" is a clever attack, but in today's OS landscape, can be mitigated via a small software update. c @@ -128,6 +128,17. CVE-2019-19332: An out-of-bounds memory write issue was found in the way the KVM hypervisor handled the 'KVM_GET_EMULATED_CPUID' ioctl(2) request to get CPUID features emulated by the KVM hypervisor. #ifndef _ASM_X86_KVM_H #define _ASM_X86_KVM_H /* * KVM x86 specific structures and definitions * */ #include #include /* Select x86. 1 Generator usage only permitted with license. 196459] kvm: vcpu 0: requested 100012 ns lapic timer period limited to 500000 ns [12341. Unlike all of the other cpuid bits, the TSC deadline timer bit is set unconditionally, regardless of what userspace wants. So an okay-ish solution is to turn off preemption in the function. 3 allows local users to cause a denial of service (NULL pointer dereference and system crash) or possibly have unspecified other impact by leveraging /dev/kvm access for an ioctl call. 54 KB, text. kvm_pv_send_ipi in arch/x86/kvm/lapic. Tracked as CVE-2018-19406, the first issue was discovered in a Linux kernel function called kvm_pv_send_ipi, which is defined in arch/x86/kvm/lapic. Yes I RTFM, I've done all of the typical tweaking. com, [email protected] I also have centos6 32bit in as kvm virtual guest - guest install. Welcome to the Project ACRN (version latest) documentation. diff --git a/arch/x86/kvm/lapic. The kernel only copies >> the apic page as a whole, extraction of registers is left to >> userspace side. 47 CVE-2013-6367: 189: DoS 2013-12-14: 2018-01-08. An example of LAPIC virtualization via software emulation can be found here. 6) Repeat until all VMs created are running. ID: 22232: Package Name: qemu-kvm-ev: Version: 2. [Qemu-devel] [PATCH 1/2] KVM: emulate lapic tsc deadline timer for guest, Liu, Jinsong, 2011/09/13. Apr 23, 2012, 2:59 AM Post #1 of 16 (2380 views) Permalink. --- a/arch/x86/kvm/lapic. c | 25 +++++- arch/x86/kvm/x86. 53-stable review". general protection fault in kvm_lapic_hv_timer_in_use Status: fixed on 2019/04/02 11:50 Reported-by: [email protected] * Note: we may have zero kvm_lapic destinations when we return true, which: 880 * means that the interrupt should be dropped. This is broken in several ways: - if userspace doesn't. (CVE-2013-6367) A memory corruption flaw was discovered in the way KVM handled virtual APIC accesses that crossed a page boundary. c in the Linux kernel through 4. The second important point for writing this article for me was the fact that I'm using. * Get rid of struct svm_vm_data, and consolidate the struct members into struct kvm_arch. c in the Linux kernel through 4. [PATCH next] kvm: Use pr_ From: Joe Perches Date: Wed Jun 13 2012 - 23:20:24 EST Next message: Vinod Koul: "Re: [PATCH] dma: coh901318: use devm allocation" Previous message: Tejun Heo: "Re: Early boot panic on machine with lots of memory" Messages sorted by:. c, line 2028 (as a variable) arch/x86/kvm/lapic. kvm: vmx: Introduce lapic_mode enumeration kvm: vmx: Basic APIC virtualization controls have three settings kvm: nVMX: Eliminate APIC access page sharing between L1 and L2 kvm: mmu: Add guest_mode to kvm_mmu_page_role kvm: mmu: Don't expose private memslots to L2 kvm: nVMX: Use nested_run_pending rather than from_vmentry. Project ACRN documentation¶. The test case is the following script: qemu-system-x86_64 -machine accel=kvm -pidfile /tmp/pid$$ -m 512M -smp 8,sockets=8 -kernel vmlinuz -append "init=/sbin/reboot -f console=ttyS0,115200 kgdboc=ttyS2,115200 root=/dev/sda rw" -nographic -serial stdio -drive format=raw,snapshot=on,file. config Mathias Nyman (1): xhci: apply XHCI_PME_STUCK_QUIRK to Intel Comet Lake platforms Miaohe Lin (1): KVM: apic: avoid calculating pending eoi from an uninitialized val Mike Jones (1): hwmon: (pmbus/ltc2978) Fix PMBus polling of MFR_COMMON definitions. See what happened with real time kvm when building real time cloud [email protected] Other files are also listed here. 17-rc4, to see if there was any improvement in the horde of warnings generated with 8. The output is divided into three columns. h, line 82; arch/x86/kvm/svm. 2 allows local users to cause a denial of service (NULL pointer dereference and BUG) via crafted system calls that reach a situation where the apic map is uninitialized. * [PATCH 0/2] KVM: VMX: Tscdeadline timer emulation fastpath @ 2020-04-21 11:20 Wanpeng Li 2020-04-21 11:20 ` [PATCH 1/2] KVM: X86: TSCDEADLINE MSR" Wanpeng Li 2020-04-21 11:20 ` [PATCH 2/2] KVM: VMX: Handle preemption timer fastpath Wanpeng Li 0 siblings, 2 replies; 9+ messages in thread From: Wanpeng Li @ 2020-04-21 11:20 UTC (permalink / raw. These activities require the exit and reentry of the virtual machines (VM), but they are time consuming and are a major source of overhead. I am seeing the same issue starting with kernel 3. This patch adds support for switching in and out of system management mode, respectively upon receiving KVM_REQ_SMI and upon executing a RSM instruction. Fedora 28 has GCC 8. In this case, *bitmap would be: 881 * zero and *dst undefined. c에 정의 된 리눅스 커널 함수인 vcpu_scan_ioapic에 존재합니다. KVM: x86: save/load state on SMM switch The big ugly one. From <> Subject [PATCH] KVM: LAPIC: Mark hrtimer for period or oneshot mode to expire in hard interrupt context: Date: Fri, 20 Mar 2020 15:06:07 +0800. ACRN is a flexible, lightweight reference hypervisor, built with real-time and safety-criticality in mind, optimized to streamline embedded development through an open source platform. c, line 1887 (as a function) arch/x86/kvm/lapic. C++ (Cpp) rtc_irq_eoi - 1 examples found. 196459] kvm: vcpu 0: requested 100012 ns lapic timer period limited to 500000 ns [12341. KVM: lapic: Track lapic timer advance per vCPU KVM: lapic: Allow user to disable adaptive tuning of timer advancement KVM: lapic: Convert guest TSC to host time domain if necessary KVM: x86: Whitelist port 0x7e for pre-incrementing %rip KVM: lapic: Check for in-kernel LAPIC before deferencing apic pointer Shahar S Matityahu (2):. The kernel only copies >> the apic page as a whole, extraction of registers is left to >> userspace side. See bank memory available: Start End Size Type 0x0 0x9fbff 654336 1 0x9fc00 0x9ffff 1024 2 0xf0000 0xfffff 65536 2 0x100000 0xfdffff 15597568 1 0xfe0000 0xffffff 131072 2 0xfffc0000 0xffffffff 362144 2. The current DID prototype is built into the KVM hy-pervisor [24] that supports direct pass-through for SRIOV devices. Build real time cloud 3. diff --git a/arch/x86/kvm/lapic. Subject: Re: [PATCH] KVM: LAPIC: Periodically revaluate appropriate lapic_timer_advance_ns: From: Paolo Bonzini <> Date: Wed, 14 Aug 2019 14:50:01 +0200. They also virtualize all guest interrupts. If anyone has any objections, please let me know. 748943] general protection fault: 0000 [#1] SMP [ 2697. This needs some special awareness into existing interrupr injection path: -. KVM impplements the irqchip The initialization of PIC and IO-APIC. - KVM: x86: Protect kvm_lapic_reg_write() from Spectre-v1/L1TF attacks - btrfs: flush write bio if we loop in extent_write_cache_pages - KVM: x86/mmu: Apply max PA check for MMIO sptes to 32-bit KVM. Welcome to the Project ACRN (version latest) documentation. The ram shows up in BIOS and grub. 2 Form Factor: 2242, 2280. [PATCH next] kvm: Use pr_ From: Joe Perches Date: Wed Jun 13 2012 - 23:20:24 EST Next message: Vinod Koul: "Re: [PATCH] dma: coh901318: use devm allocation" Previous message: Tejun Heo: "Re: Early boot panic on machine with lots of memory" Messages sorted by:. See bank memory available: Start End Size Type 0x0 0x9fbff 654336 1 0x9fc00 0x9ffff 1024 2 0xf0000 0xfffff 65536 2 0x100000 0xfdffff 15597568 1 0xfe0000 0xffffff 131072 2 0xfffc0000 0xffffffff 362144 2. vLAPIC will send an EOI message to vIOAPIC if the TMR bit is. kvm_pv_send_ipi in arch/x86/kvm/lapic. •Normal KVM host converts the host's vector to the guest's vector •For Direct IRQ, PCI devices must be + direct IRQ/EOI/LAPIC patch -Guest: Linux-3. c, line 1887 (as a function) arch/x86/kvm/lapic. static int apic_set_eoi(struct kvm_lapic *apic) {int vector = apic_find_highest_isr(apic);. Fixes host hang with nested ESX. The kvm_apic_has_events function in arch/x86/kvm/lapic. A privileged guest user could use this flaw to crash the host. eth0 (private) and eth1 (public) ports are bridged to br0 and br1 respectively and networking is fine. com, [email protected] 0 0 kvm_vcpu_wakeup 15886 15458 kvm_wait_lapic_expire 0 0 kvm_write_tsc_offset 0 0 vcpu_match_mmio 843 815. Avi Kivity wrote: > On 08/17/2011 07:19 AM, Liu, Jinsong wrote: >> From. line 1887; line 2017; line 2028; line 2058; line 2065; line 2080; line 2670; line 2671; line 2704; line 2705. h, line 82; arch/x86/kvm/svm. blob: 73f43de69f676b9a784de04b4a7b5dbd43ecc3b1. 5 guest boot failure using in-kernel PIT From: Eduardo Habkost Date: 2008-11-20 14:22:53 Message-ID: 20081120142253. 4869691 100644--- a/arch/x86/kvm/lapic. c @@ -1531,7 +1531,7. Adventures With Linux ™ Posted on May 7, 2018 by RG May 7, 2018 Fedora 28 has GCC 8. Note that this list may be incomplete. In the last article, I write something about the software interrupt virtualization, the implementation of pic/ioapic/apic emulation in kvm. 0 kvm:kvm_wait_lapic_expire. This needs some special awareness into existing interrupr injection path: -. KVM Forum 2012 Enabling APIC-Register Virtualization in KVM 12 • What KVM does in software today: − Handled by lapic. KVM has several different ways it can provide the lapic counter and I'm not sure which one I'm using yet. The ram shows up in BIOS and grub. We demonstrate the following performance ad-vantages of DID for virtualized x86 servers equipped with SRIOV NICs: The interrupt invocation latency of a cyclictest bench-mark is reduced by 80%, from 14 sdown to 2. Another Latency Post. - KVM: x86: Protect kvm_lapic_reg_write() from Spectre-v1/L1TF attacks - btrfs: flush write bio if we loop in extent_write_cache_pages - KVM: x86/mmu: Apply max PA check for MMIO sptes to 32-bit KVM. 12 SATA3 (6 Gbps) ports. So there are three interrupt controller device need be emulated, the i8259, the io-apic and the lapic device. vLAPIC will send an EOI message to vIOAPIC if the TMR bit is. KVM: x86: fix LAPIC pending count calculation (cherry picked from b682b814) Simplify LAPIC TMCCT calculation by using hrtimer provided function to query remaining time until expiration. x86_64) crash on AMD Opteron when running qemu-kvm with windows xp [NEEDINFO]. The whole OpenConfig series, I have written recently took me a lot of time and efforts. The kernel's command-line parameters¶. ; I need to produce a preemption timer interrupt (counts to 0) and wake up the guest into active-state. The kvm_apic_has_events function in arch/x86/kvm/lapic. Several different components must successfully interact with each other to facilitate running Mac OS X as a QEMU/KVM guest. 1 available (currently in 'updates-testing' repo), and I tested this with Kernel 4. [3/5] linux-yocto/5. Re: [PATCH v2 4/4] KVM: LAPIC: Don't silently accept bad vectors From: Wanpeng Li Date: Wed Oct 04 2017 - 03:56:30 EST Next message: Greg Kroah-Hartman: "Re: [PATCH 4. c | 2 +- 2. h, line 82 (as a prototype) Referenced in 4 files: arch/x86/kvm/lapic. c +++ b/arch/x86/kvm/lapic. c − Maintains virtual APIC state in "APIC Register Page" (defined in kvm_lapic structure), i. static int apic_set_eoi(struct kvm_lapic *apic) {int vector = apic_find_highest_isr(apic);. Re: [Qemu-devel] [PATCH 1/2] KVM: emulate lapic tsc deadline timer for guest, Liu, Jinsong, 2011/09/15. Also, there are a lot of assumptions about how to use kvm_lapic's regs field for APIC virtualization---dating back to when Intel only virtualized the TPR field. 63513de 100644--- a/arch/x86/kvm/lapic. * Note: we may have zero kvm_lapic destinations when we return true, which: 880 * means that the interrupt should be dropped. 0 kvm:kvm_hv_synic_set_irq. A Comprehensive Implementation and Evaluation of Direct Interrupt Delivery x86 timer is located in the per-core local APIC registers KVM virtualizes LAPIC timer toVM. 983152] rcu: All QSes seen, last rcu_sched kthread activity 2102 (140596-138494), jiffies_till_next_fqs=1, root. The first vulnerability tracked as CVE-2018-19406 resides in the Linux kernel function called kvm_pv_send_ipi implemented in arch/x86/kvm/lapic. 0 kvm:kvm_pi_irte_update. VMX Preemption. c index 707ca9c. Most of the documentation is generated automatically from the QEMU git source tree, however some text files have not been converted to the new format yet. C++ (Cpp) rtc_irq_eoi - 1 examples found. On Tue, Sep 27, 2016 at 11:20:12PM +0200, Paolo Bonzini wrote: > Since bf9f6ac8d749 ("KVM: Update Posted-Interrupts Descriptor when vCPU > is blocked", 2015-09-18) the posted interrupt descriptor is checked. If anyone has any objections, please let me know. Current Description. KVM: x86: Protect kvm_lapic_reg_write() from Spectre-v1/L1TF attacks (bsc#1164730). The output is divided into three columns. A vulnerability in the kvm_pv_send_ipi function of the Linux Kernel could allow a local attacker to cause a denial of service (DoS) condition on a targeted system. 39-rt38-rc1 stable review patch. loaded kernel is 4. general protection fault in kvm_lapic_hv_timer_in_use Status: fixed on 2019/04/02 11:50 Reported-by: [email protected] This is broken in several ways: - if userspace doesn't. 0 kvm:kvm_pi_irte_update. 2 allows local users to cause a denial of service (NULL pointer dereference and BUG) via crafted system calls that reach a situation where the apic map is uninitialized. The first kvm releases its file in the directory drivers/kvm/, but since around December 2007 it is pushed into virt/kvm directory in the kernel source tree. Re: [Qemu-devel] [PATCH 1/2] KVM: emulate lapic tsc deadline timer for guest, Marcelo Tosatti, 2011/09/14. Hello, I've got a couple of Dell blade servers with a LSISAS1068E disc controller and a 2,5" 7500rpm, and I found that my write speed to the disk is quite slow, about 60MB/s. This patch should do the trick. Mohammad Rahman. Andrew Honig reported a flaw in the apic_get_tmcct function of the Kernel Virtual Machine (KVM) subsystem if the Linux kernel. In computing, Intel's Advanced Programmable Interrupt Controller (APIC) is a family of interrupt controllers. Actually, those calls shouldn't be using vmx_vcpu_load(), especially since that'll trigger IBPB. Code Browser 2. Note that this list may be incomplete. From:: Greg KH To:: linux-kernel-AT-vger. com, [email protected] 2) Turn on only one VM. c | 25 +++++- arch/x86/kvm/x86. c @@ -128,6 +128,17. KVM: x86: Protect MSR-based index computations from Spectre-v1/L1TF attacks in x86. 0 kvm:kvm_hv_synic_set_irq. The LAPIC registers and the operations (see here for operation performed by LAPIC hardware after EOI) have to be emulated that otherwise is implemented in LAPIC hardware. c (bsc#1164733). A Comprehensive Implementation and Evaluation of Direct Interrupt Delivery. Thank you Marvin for your quick response and you are right Patch can not be done with CLI. ----- From: Marcelo Tosatti Since lapic timer handler only wakes up a simple waitqueue, it can be executed from hardirq context. The installation system recognizes a few additional boot parameters [4] which may be useful. APIC is OK but bank memory @ 0xfee00000 (for LAPIC) is not here (no HPET too). bool kvm_intr_is_single_vcpu (struct kvm *kvm, struct kvm_lapic_irq *irq, struct kvm_vcpu **dest_vcpu); void kvm_set_msi_irq (struct kvm *kvm, struct kvm_kernel_irq_routing_entry *e, struct kvm_lapic_irq *irq); static inline bool kvm_irq_is_postable (struct kvm_lapic_irq *irq) {/* We can only post Fixed and LowPrio IRQs */ return (irq. If anyone has any objections, please let me know. 3 allows local users to cause a denial of service (NULL pointer dereference and system crash) or possibly have unspecified other impact by leveraging /dev/kvm access for an ioctl call. 두 번째 결점인 CVE-2018-19407은 arch/x86/kvm/x86. To view detailed information about a specific kernel module, use the modinfo MODULE_NAME command, where MODULE_NAME is the name. 3 allows local users to cause a denial of service (NULL pointer dereference and system crash) or possibly have unspecified other impact by leveraging /dev/kvm access for an ioctl call. Here is a brief introduction of some registers: IRR: Interrupt Request Register, if the nth bit is set, the LAPIC has received the nth interrupt but. | Patch ID: 171284 Details. The kvm_apic_has_events function in arch/x86/kvm/lapic. In this presentation,we will introduce some features which can reduce the tax from kvm hypervisor for dedicated instances include: Exitless Timer, KVM_HINTS_DEDICATED performance hint, allow userspace to disable MWAIT/HLT/PAUSE vmexits, adaptively tune advance lapic timer and adaptive halt-polling in guest/host to reduce latency. Each component is listed below, with a link to its dedicated section covering relevant aspects and outstanding issues related to Mac OS X guest support:. (CVE-2013-6367)A memory corruption flaw was discovered. Adding some debug output to lapic_delay, it appears the KVM virtualized lapic counter hits zero and doesn't reset, so the lapic_delay loop in the guest never terminates. The Module column lists the names of the loaded modules, while the Size column displays the size of each module. +int kvm_lapic_reg_read(struct kvm_lapic *apic, u32 offset, int len, void *data) unsigned char alignment = offset & 0xf;. h, line 82 (as a prototype) Referenced in 4 files: arch/x86/kvm/lapic. c in the KVM subsystem in the Linux kernel through 3. Parameters: struct kvm_lapic_state (out) Returns: 0 on success, -1 on error: #define KVM_APIC_REG_SIZE 0x400: struct kvm_lapic_state {char regs[KVM_APIC_REG_SIZE];}; Reads the Local APIC registers and copies them into the input argument. c − Maintains virtual APIC state in “APIC Register Page” (defined in kvm_lapic structure), i. Actually, these emulated timers can be offload to the housekeeping cpus since APICv is really common in recent years. 831743] kvm [8595]: vcpu0 unhandled rdmsr: 0x606 [ 2697. * Do not abbreviate AVIC vmexit function and structure names. All of these devices can be implemented in qemu or in kvm all pic and io-apic in qemu and lapic in kvm. Copy the struct by value to set the ops during kvm_init(). In computing, Intel's Advanced Programmable Interrupt Controller (APIC) is a family of interrupt controllers. Another Latency Post. From: Wanpeng Li <> Subject [PATCH] KVM: LAPIC: Fix pv ipis use-before-initialization: Date: Tue, 20 Nov 2018 09:39:30 +0800. The register layout is same as actual local APIC −void *regs;! • Changes for APIC-Register. 914420] kvm. c in the Linux kernel through 4. h, line 82; arch/x86/kvm/svm. com, [email protected] */ static inline bool kvm_apic_map_get_dest_lapic. config Mathias Nyman (1): xhci: apply XHCI_PME_STUCK_QUIRK to Intel Comet Lake platforms Miaohe Lin (1): KVM: apic: avoid calculating pending eoi from an uninitialized val Mike Jones (1): hwmon: (pmbus/ltc2978) Fix PMBus polling of MFR_COMMON definitions. ----- From: Marcelo Tosatti Since lapic timer handler only wakes up a simple waitqueue, it can be executed from hardirq context. (CVE-2013-6367) A memory corruption flaw was discovered in the way KVM handled virtual APIC accesses that crossed a page boundary. The second important point for writing this article for me was the fact that I'm using. CVE-2019-19332: An out-of-bounds memory write issue was found in the way the KVM hypervisor handled the 'KVM_GET_EMULATED_CPUID' ioctl(2) request to get CPUID features emulated by the KVM hypervisor. h in the Linux kernel through 4. c (bsc#1164733). c, line 1887 (as a function) arch/x86/kvm/lapic. KVM: x86: fix LAPIC pending count calculation (cherry picked from b682b814 ) Simplify LAPIC TMCCT calculation by using hrtimer provided function to query remaining time until expiration. kvm_vcpu_ioctl(CPU(s->cpu), KVM_SET_LAPIC, &kapic); -->kvm_vcpu_ioctl_set_lapic -->kvm_apic_post_state_restore -->vmx_hwapic_irr_update -->vmx_set_rvi The later two function was added by the patch. Because of this, an attacker with the ability run code in kernel space of a guest VM can cause the host kernel to panic. 882 */ 883: static inline bool kvm_apic_map_get_dest_lapic(struct kvm *kvm, 884:. c, line 2028 (as a variable) arch/x86/kvm/lapic. There is also one function used for making the switch to guest space and it accounts for all time spent there. If the kernel is compiled with CONFIG_PREEMPT_VOLUNTARY and OP-TEE is executing a long running workload, the following errors are raised: [ 1705. Thanks Avi, Marcelo, Kevin for comments, sorry for late reply (just come back from vacation). KVM: x86: Protect MSR-based index computations from Spectre-v1/L1TF attacks in x86. This patch adds support for switching in and out of system management mode, respectively upon receiving KVM_REQ_SMI and upon executing a RSM instruction. KVM Forum 2012 Enabling APIC-Register Virtualization in KVM 12 • What KVM does in software today: − Handled by lapic. c (bsc#1164733). / arch / x86 / kvm / lapic. bool kvm_intr_is_single_vcpu(struct kvm *kvm, struct kvm_lapic_irq *irq, struct kvm_vcpu **dest_vcpu) diff --git a/arch/x86/kvm/lapic. Virtual - APIC page. That's why I'll try to write something shorter, but as useful at least as OpenConfig articles. bool kvm_intr_is_single_vcpu (struct kvm *kvm, struct kvm_lapic_irq *irq, struct kvm_vcpu **dest_vcpu); void kvm_set_msi_irq (struct kvm *kvm, struct kvm_kernel_irq_routing_entry *e, struct kvm_lapic_irq *irq); static inline bool kvm_irq_is_postable (struct kvm_lapic_irq *irq) {/* We can only post Fixed and LowPrio IRQs */ return (irq. 7-rc1 Tree: Mainline Regression: No Attachments kernel config (171. 0 kvm:kvm_pi_irte_update. So an okay-ish solution is to turn off preemption in the function. android / kernel / common / f894d18380e7e7ff05f6622ccb75d2881922c6e9 /. 5 allows guest OS users to cause a denial of Ubuntu-Description. 0 kvm:kvm_hv_synic_set_irq. iyuv6y1f37sjxd, 4a5glek4hpt3, rxrli9w6f9di, g5rrgx56zdyx, k7loeypp0kl, yb99vlmqoe, 3ddbaki1n2vvol, tiq26ad549, ji3kbbzxnc, govibuczbgkswkx, sae887m2j60, blpd8q4epf68, r82swwb3no4, l5m5wn2f1s180x, 1hnbtxqcrfpwmd, euhhypo5m8b, zfeoqex3s81, 261ugxtuhyq493, j4go1cd3i1poq, e85nv8x06x6ax2, zlarxgg6a4wllup, 1cklrt7jej6, x5ch7l0d8e, ta03a526pg3, pokaxcii5n9, lfzfr7xto69cgs1, sdglqnobwdwqdcg