KVM: nSVM: Disable intercept of VINTR if saved L1 host RFLAGS.IF is 0

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Disable intercept of virtual interrupts (used to detect interrupt windows)
if the saved host (L1) RFLAGS.IF is '0', as the effective RFLAGS.IF for L1
interrupts will never be set while L2 is running (L2's RFLAGS.IF doesn't
affect L1 IRQs when virtual interrupts are enabled).

Suggested-by: Sean Christopherson <seanjc@google.com>
Link: https://lkml.kernel.org/r/Y9hybI65So5X2LFg%40google.com
Signed-off-by: Santosh Shukla <Santosh.Shukla@amd.com>
Link: https://lore.kernel.org/r/20230227084016.3368-3-santosh.shukla@amd.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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This commit is contained in:

Santosh Shukla 2023-02-27 14:10:07 +05:30 • committed by Sean Christopherson

parent 5faaffab5b

commit 7334ede457

2 changed files with 20 additions and 5 deletions

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15

arch/x86/kvm/svm/nested.c

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10

arch/x86/kvm/svm/svm.c

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