On 8/10/23 18:49, Sean Christopherson wrote:
Fix a bug where KVM injects a bogus #UD for SEV guests when trying to skip
an INT3 as part of re-injecting the associated #BP that got kinda sorta
intercepted due to a #NPF occuring while vectoring/delivering the #BP.
I haven't actually confirmed that patch 1 fixes the bug, as it's a
different change than what I originally proposed. I'm 99% certain it will
work, but I definitely need verification that it fixes the problem
Patch 2 is a tangentially related cleanup to make NRIPS a requirement for
enabling SEV, e.g. so that we don't ever get "bug" reports of SEV guests
not working when NRIPS is disabled.
Sean Christopherson (2):
KVM: SVM: Don't inject #UD if KVM attempts emulation of SEV guest w/o
insn
KVM: SVM: Require nrips support for SEV guests (and beyond)
arch/x86/kvm/svm/sev.c | 2 +-
arch/x86/kvm/svm/svm.c | 37 ++++++++++++++++++++-----------------
arch/x86/kvm/svm/svm.h | 1 +
3 files changed, 22 insertions(+), 18 deletions(-)
We ran some stress tests against a version of the kernel without this fix
and we're able to reproduce the issue, but not reliably, after a few
hours. With this patch, it has not reproduced after running for a week.
Not as reliable a scenario as the original reporter, but this looks like
it resolves the issue.
So, for the series:
Reviewed-by: Tom Lendacky <thomas.lendacky@xxxxxxx>
base-commit: 240f736891887939571854bd6d734b6c9291f22e
