Re: [PATCH] KVM: SVM: fix interrupt injection (apic->isr_count always 0)

[Borislav Petkov]

On Wed, Feb 25, 2015 at 08:41:41PM +0100, Radim KrÄmÃÅ wrote:
> this patch should fix it.

Yap, seems so :-)

> ---8<---
> In commit b4eef9b36db4, we started to use hwapic_isr_update() != NULL
> instead of kvm_apic_vid_enabled(vcpu->kvm).  This didn't work because
> SVM had it defined and "apicv" path in apic_{set,clear}_isr() does not
> change apic->isr_count, because it should always be 1.  The initial
> value of apic->isr_count was based on kvm_apic_vid_enabled(vcpu->kvm),
> which is always 0 for SVM, so KVM could have injected interrupts when it
> shouldn't.
> 
> Fix it by setting SVM's hwapic_isr_update to NULL and make the initial
> isr_count depend on hwapic_isr_update() for good measure.
> 
> Fixes: b4eef9b36db4 ("kvm: x86: vmx: NULL out hwapic_isr_update() in case of !enable_apicv")
> Reported-by: Borislav Petkov <bp@xxxxxxxxx>

Reported-and-tested-by: Borislav Petkov <bp@xxxxxxx>

> Signed-off-by: Radim KrÄmÃÅ <rkrcmar@xxxxxxxxxx>

Thanks.

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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