KVM: x86: Sync the pending Posted-Interrupts

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Some Posted-Interrupts from passthrough devices may be lost or
overwritten when the vCPU is in runnable state.

The SN (Suppress Notification) of PID (Posted Interrupt Descriptor) will
be set when the vCPU is preempted (vCPU in KVM_MP_STATE_RUNNABLE state
but not running on physical CPU). If a posted interrupt coming at this
time, the irq remmaping facility will set the bit of PIR (Posted
Interrupt Requests) without ON (Outstanding Notification).
So this interrupt can't be sync to APIC virtualization register and
will not be handled by Guest because ON is zero.

Signed-off-by: Luwei Kang <luwei.kang@intel.com>
[Eliminate the pi_clear_sn fast path. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

...

This commit is contained in:

Luwei Kang 2019-01-31 16:52:02 +08:00 • committed by Paolo Bonzini

parent c029b5deb0

commit 81b016676e

3 changed files with 18 additions and 22 deletions

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26

arch/x86/kvm/vmx/vmx.c

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16

arch/x86/kvm/vmx/vmx.h

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2

arch/x86/kvm/x86.c

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