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authorSuthikulpanit, Suravee <Suravee.Suthikulpanit@amd.com>2019-03-20 08:12:28 +0000
committerPaolo Bonzini <pbonzini@redhat.com>2019-04-16 15:37:31 +0200
commit4a58038b9e420276157785afa0a0bbb4b9bc2265 (patch)
tree10df4ab0741861975425ea4a86f069255c915294 /.cocciconfig
parentbc8a3d8925a8fa09fa550e0da115d95851ce33c6 (diff)
downloadtalos-op-linux-4a58038b9e420276157785afa0a0bbb4b9bc2265.tar.gz
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Revert "svm: Fix AVIC incomplete IPI emulation"
This reverts commit bb218fbcfaaa3b115d4cd7a43c0ca164f3a96e57. As Oren Twaig pointed out the old discussion: https://patchwork.kernel.org/patch/8292231/ that the change coud potentially cause an extra IPI to be sent to the destination vcpu because the AVIC hardware already set the IRR bit before the incomplete IPI #VMEXIT with id=1 (target vcpu is not running). Since writting to ICR and ICR2 will also set the IRR. If something triggers the destination vcpu to get scheduled before the emulation finishes, then this could result in an additional IPI. Also, the issue mentioned in the commit bb218fbcfaaa was misdiagnosed. Cc: Radim Krčmář <rkrcmar@redhat.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Reported-by: Oren Twaig <oren@scalemp.com> Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> Cc: stable@vger.kernel.org Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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