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From: Wanpeng Li <[email protected]> Advance lapic timer tries to hidden the hypervisor overhead between the host emulated timer fires and the guest awares the timer is fired. general protection fault in kvm_lapic_hv_timer_in_use Status: fixed on 2019/04/02 11:50 Reported-by: [email protected]

KVM: Accelerated apic support 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.g. there is no interrupt pending with a higher priority than the new tpr). 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. An example of LAPIC virtualization via software emulation can be found here. static int apic_set_eoi(struct kvm_lapic *apic) {int vector = apic_find_highest_isr(apic); Dec 17, 2013 · Iozone v3.42 was chosen to test the file I/O performance of a system. The beta version of the 64-bit Enterprise edition of Redhat* 7 was used with kvm* installed on a system with two pre-production Intel(R) Xeon(R) E5-2697 v2 processors and 64GB of RAM. The recalculate_apic_map function in arch/x86/kvm/lapic.c in the KVM subsystem in the Linux kernel through 3.12.5 allows guest OS users to cause a denial of service (host OS crash) via a crafted ICR write operation in x2apic mode.

*PATCH v2 2/2] KVM: LAPIC: Don't need to clear IPI delivery status in x2apic mode 2020-04-01 0:19 [PATCH v2 1/2] KVM: X86: Filter out the broadcast dest for IPI fastpath ... arch/x86/kvm/x86.c, line 1565 amazon-freertos arm-trusted-firmware barebox busybox coreboot dpdk glibc linux llvm mesa musl ofono qemu u-boot uclibc-ng zephyr Projects
I have a Windows 10 VM running under KVM on Linux. I'm using libvirt to manage it, if it matters. When the VM is idle (0-1% CPU utilization in Task Manager) the underlying qemu-system-x86_64 process is consuming 15-20% of a CPU core. Aug 17, 2011 · Thanks Avi, Marcelo, Kevin for comments, sorry for late reply (just come back from vacation). Avi Kivity wrote: > On 08/17/2011 07:19 AM, Liu, Jinsong wrote: >> From ...

To minimize the latency of timer interrupts as observed by the guest, KVM adjusts the values it programs into the host timers to account for the host's overhead of programming and handling the timer event. The format of the APIC ID register (bytes 32-35 of struct kvm_lapic_state’s regs field) depends on the state of the KVM_CAP_X2APIC_API capability. See the note in ... kvm_pv_send_ipi in arch/x86/kvm/lapic.c in the Linux kernel through 4.19.2 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. Source: MITRE

Dec 17, 2013 · Iozone v3.42 was chosen to test the file I/O performance of a system. The beta version of the 64-bit Enterprise edition of Redhat* 7 was used with kvm* installed on a system with two pre-production Intel(R) Xeon(R) E5-2697 v2 processors and 64GB of RAM. Hey, I just updated kvm to the latest head revision (userland and kernelspace) on a 32bit host runnig fedora 6. First my Ubuntu Lts guest panicked because of some acpi thing.

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Hey, I just updated kvm to the latest head revision (userland and kernelspace) on a 32bit host runnig fedora 6. First my Ubuntu Lts guest panicked because of some acpi thing. Yes, this is another one of those latency posts, I'm sorry. Yes I RTFM, I've done all of the typical tweaking. I've spent 20+ hours at this point trying to bring down my latency and stop the massive spikes. I've gotten to the point where I've been reading up on kvm_exits. I'm hoping someone can help me regain my sanity.

The affected function is kvm_lapic_expired_hv_timer() from arch/x86/kvm/lapic.c. Preemption can kick in here, but the function does not work well with this. So an okay-ish solution is to turn off preemption in the function.

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Fedora 28 has GCC 8.1.1 available (currently in ‘updates-testing‘ repo), and I tested this with Kernel 4.17-rc4, to see if there was any improvement in the horde of warnings generated with 8.0.1. Current Description. The kvm_apic_has_events function in arch/x86/kvm/lapic.h in the Linux kernel through 4.1.3 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.

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[email protected] wrote: > He, Qing wrote: >> KVM: in-kernel LAPIC save and restore support >>=20 >> This patch adds a new vcpu-based IOCTL to save and restore the >> local apic registers for a single vcpu. The kernel only copies >> the apic page as a whole, extraction of registers is left to >> userspace side. 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. An example of LAPIC virtualization via software emulation can be found here. static int apic_set_eoi(struct kvm_lapic *apic) {int vector = apic_find_highest_isr(apic); Apr 23, 2020 · On Thu, 23 Apr 2020 at 17:39, Paolo Bonzini <[email protected]> wrote: > > On 23/04/20 11:01, Wanpeng Li wrote: > > + > > +void kvm_set_lapic_tscdeadline_msr(struct kvm_vcpu *vcpu, u64 data)

I have a Windows 10 VM running under KVM on Linux. I'm using libvirt to manage it, if it matters. When the VM is idle (0-1% CPU utilization in Task Manager) the underlying qemu-system-x86_64 process is consuming 15-20% of a CPU core.  

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. Other files are also listed here. kvm_pv_send_ipi in arch/x86/kvm/lapic.c in the Linux kernel through 4.19.2 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. Source: MITRE

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Yes, this is another one of those latency posts, I'm sorry. Yes I RTFM, I've done all of the typical tweaking. I've spent 20+ hours at this point trying to bring down my latency and stop the massive spikes. I've gotten to the point where I've been reading up on kvm_exits. I'm hoping someone can help me regain my sanity. Using GNU GLOBAL and gtags-cscope in vim. Ask Question ... Assume that I am editing the file arch/x86/kvm/x86.c and the cursor is on the function call kvm_lapic ...

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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
The correct way of fixing this would be to save and restore the > full 32 bit register, but because x2APIC LDR is a function of x2APIC ID, > we can also compute it and keep the migration format untouched. > > KVM always expected the LDR format to follow the xAPIC/x2APIC standard, > but pre 4.1 KVMs used non-standard x2APIC ID in case the OS ...

The recalculate_apic_map function in arch/x86/kvm/lapic.c in the KVM subsystem in the Linux kernel through 3.12.5 allows guest OS users to cause a denial of service (host OS crash) via a crafted ICR write operation in x2apic mode. CVE-2013-6368 Kvm lapic - fredandgingercoffee.co.uk ... Kvm lapic Dec 17, 2013 · Iozone v3.42 was chosen to test the file I/O performance of a system. The beta version of the 64-bit Enterprise edition of Redhat* 7 was used with kvm* installed on a system with two pre-production Intel(R) Xeon(R) E5-2697 v2 processors and 64GB of RAM.

APIC Timer Modes . The timer has 2 or 3 modes. The first 2 modes (periodic and one-shot) are supported by all local APICs. The third mode (TSC-Deadline mode) is an extension that is only supported on recent CPUs. Current Description. The kvm_apic_has_events function in arch/x86/kvm/lapic.h in the Linux kernel through 4.1.3 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. Aug 17, 2011 · Thanks Avi, Marcelo, Kevin for comments, sorry for late reply (just come back from vacation). Avi Kivity wrote: > On 08/17/2011 07:19 AM, Liu, Jinsong wrote: >> From ... general protection fault in kvm_lapic_hv_timer_in_use Status: fixed on 2019/04/02 11:50 Reported-by: [email protected] The affected function is kvm_lapic_expired_hv_timer() from arch/x86/kvm/lapic.c. Preemption can kick in here, but the function does not work well with this. So an okay-ish solution is to turn off preemption in the function.

Using GNU GLOBAL and gtags-cscope in vim. Ask Question ... Assume that I am editing the file arch/x86/kvm/x86.c and the cursor is on the function call kvm_lapic ... In the last article, I write something about the software interrupt virtualization, the implementation of pic/ioapic/apic emulation in kvm. We know that in software emulation, for every guest-interrupt a VM-exit is needed, this is a very remarkable overhead for virtualization. From: Wanpeng Li <[email protected]> Introduce interrupt delivery fastpath, I observe kvm_x86_ops.deliver_posted_interrupt() has more latency then vmx_sync_pir_to_irr in my case, since it needs to wait vmentry, after that it can handle external interrupt, ack the notification vector, read posted-interrupt desciptor etc, it is slower than evaluate and delivery during vmentry method. Nov 26, 2018 · “kvm_pv_send_ipi in arch/x86/kvm/lapic.c in the Linux kernel through 4.19.2 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.” reads the security advisory. general protection fault in kvm_lapic_hv_timer_in_use Status: fixed on 2019/04/02 11:50 Reported-by: [email protected]

Kernel.org Bugzilla – Bug 207315 Out of bounds access in search_memslots() in include/linux/kvm_host.h Last modified: 2020-04-19 13:06:20 UTC Yes, this is another one of those latency posts, I'm sorry. Yes I RTFM, I've done all of the typical tweaking. I've spent 20+ hours at this point trying to bring down my latency and stop the massive spikes. I've gotten to the point where I've been reading up on kvm_exits. I'm hoping someone can help me regain my sanity.

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Va osdbuHey, I just updated kvm to the latest head revision (userland and kernelspace) on a 32bit host runnig fedora 6. First my Ubuntu Lts guest panicked because of some acpi thing. APIC Timer Modes . The timer has 2 or 3 modes. The first 2 modes (periodic and one-shot) are supported by all local APICs. The third mode (TSC-Deadline mode) is an extension that is only supported on recent CPUs. 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.

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Hey, I just updated kvm to the latest head revision (userland and kernelspace) on a 32bit host runnig fedora 6. First my Ubuntu Lts guest panicked because of some acpi thing. Aug 17, 2011 · Thanks Avi, Marcelo, Kevin for comments, sorry for late reply (just come back from vacation). Avi Kivity wrote: > On 08/17/2011 07:19 AM, Liu, Jinsong wrote: >> From ... Using GNU GLOBAL and gtags-cscope in vim. Ask Question ... Assume that I am editing the file arch/x86/kvm/x86.c and the cursor is on the function call kvm_lapic ...

Actual results: kernel crash Expected results: no crash Additional info: after spent several days on reading the kernel/kvm code and kdump, I think the problem is in the kvm, when vcpu_enter_guest() disable the irq, the page_fault from copy_to_user of this cpu will call flush_tlb_others_ipi() to send a ipi to other cpu, at the same time ... The vulnerability is in kvm_lapic_sync_from_vapic() and kvm_lapic_sync_to_vapic() functions of the arch/x86/kvm/lapic.c source file, which may use the vcpu->arch.apic->vapic_addr variable to compute the offset in a memory page. A local attacker could exploit this vulnerability by providing a crafted vapic_addr value that is at the end of a ...

I have a Windows 10 VM running under KVM on Linux. I'm using libvirt to manage it, if it matters. When the VM is idle (0-1% CPU utilization in Task Manager) the underlying qemu-system-x86_64 process is consuming 15-20% of a CPU core.

Actual results: kernel crash Expected results: no crash Additional info: after spent several days on reading the kernel/kvm code and kdump, I think the problem is in the kvm, when vcpu_enter_guest() disable the irq, the page_fault from copy_to_user of this cpu will call flush_tlb_others_ipi() to send a ipi to other cpu, at the same time ...