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Groups > linux.kernel > #1206887
| From | Paolo Bonzini <pbonzini@redhat.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH 2/2] KVM: x86: fix edge EOI and IOAPIC reconfig race |
| Date | 2015-08-13 17:00 +0200 |
| Message-ID | <pX294-6rZ-9@gated-at.bofh.it> (permalink) |
| References | <pX13j-4V5-3@gated-at.bofh.it> <pX13k-4V5-23@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
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@vger.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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[PATCH 0/2] KVM: x86: fix edge EOI and IOAPIC reconfig race Radim Krčmář <rkrcmar@redhat.com> - 2015-08-13 15:50 +0200
[PATCH 1/2] KVM: x86: return bool from x86_ops.sync_pir_to_irr Radim Krčmář <rkrcmar@redhat.com> - 2015-08-13 15:50 +0200
[PATCH 2/2] KVM: x86: fix edge EOI and IOAPIC reconfig race Radim Krčmář <rkrcmar@redhat.com> - 2015-08-13 15:50 +0200
Re: [PATCH 2/2] KVM: x86: fix edge EOI and IOAPIC reconfig race Paolo Bonzini <pbonzini@redhat.com> - 2015-08-13 17:00 +0200
Re: [PATCH 2/2] KVM: x86: fix edge EOI and IOAPIC reconfig race Radim Krčmář <rkrcmar@redhat.com> - 2015-08-14 10:40 +0200
Re: [PATCH 2/2] KVM: x86: fix edge EOI and IOAPIC reconfig race Paolo Bonzini <pbonzini@redhat.com> - 2015-08-15 02:10 +0200
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