Re: [Xen-devel] [PATCH for-4.13 v4] x86/vmx: always sync PIR to IRR before vmentry

[Jürgen Groß <jgross@xxxxxxxx>]

On 27.11.19 16:48, Roger Pau Monne wrote:
> When using posted interrupts on Intel hardware it's possible that the
> vCPU resumes execution with a stale local APIC IRR register because
> depending on the interrupts to be injected vlapic_has_pending_irq
> might not be called, and thus PIR won't be synced into IRR.
>
> Fix this by making sure PIR is always synced to IRR in
> hvm_vcpu_has_pending_irq regardless of what interrupts are pending.
>
> Reported-by: Joe Jin <joe.jin@xxxxxxxxxx>
> Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
Release-acked-by: Juergen Gross <jgross@xxxxxxxx>


Juergen

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