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Date: Thu, 13 Aug 2015 16:53:17 +0200 From: Paolo Bonzini <pbonzini@...hat.com> To: Radim Krčmář <rkrcmar@...hat.com>, linux-kernel@...r.kernel.org Cc: kvm@...r.kernel.org, Steve Rutherford <srutherford@...gle.com>, stable@...r.kernel.org Subject: Re: [PATCH 2/2] KVM: x86: fix edge EOI and IOAPIC reconfig race On 13/08/2015 15:46, Radim Krčmář wrote: > 1) IOAPIC inject a vector from i8254 > 2) guest reconfigures that vector's VCPU and therefore eoi_exit_bitmap > on original VCPU gets cleared > 3) guest's handler for the vector does EOI > 4) KVM's EOI handler doesn't pass that vector to IOAPIC because it is > not in that VCPU's eoi_exit_bitmap > 5) i8254 stops working > > This creates an unwanted situation if the vector is reused by a > non-IOAPIC source, but I think it is so rare that we don't want to make > the solution more sophisticated. What happens if the vector is changed in step 2? __kvm_ioapic_update_eoi won't match the redirection table entry. How do you reproduce the bug? Paolo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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