KVM: SVM: detect opening of SMI window using STGI intercept

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Commit 05cade71cf ("KVM: nSVM: fix SMI injection in guest mode") made
KVM mask SMI if GIF=0 but it didn't do anything to unmask it when GIF is
enabled.

The issue manifests for me as a significantly longer boot time of Windows
guests when running with SMM-enabled OVMF.

This commit fixes it by intercepting STGI instead of requesting immediate
exit if the reason why SMM was masked is GIF.

Fixes: 05cade71cf ("KVM: nSVM: fix SMI injection in guest mode")
Signed-off-by: Ladi Prosek <lprosek@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>

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This commit is contained in:

Ladi Prosek 2017-10-17 16:02:39 +02:00 • committed by Radim Krčmář

parent 9b8ebbdb74

commit cc3d967f7e

4 changed files with 36 additions and 9 deletions

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1

arch/x86/include/asm/kvm_host.h

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16

arch/x86/kvm/svm.c

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6

arch/x86/kvm/vmx.c

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22

arch/x86/kvm/x86.c

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