Re: [PATCH v3 4/5] KVM: selftests: Add a test for KVM_RUN+rseq to detect task migration bugs

- On Sep 1, 2021, at 4:30 PM, Sean Christopherson sea...@google.com wrote: > Add a test to verify an rseq's CPU ID is updated correctly if the task is > migrated while the kernel is handling KVM_RUN. This is a regression test > for a bug introduced by commit 72c3c0fe54a3 ("x86/kvm: Use

[PATCH v3 4/5] KVM: selftests: Add a test for KVM_RUN+rseq to detect task migration bugs

Add a test to verify an rseq's CPU ID is updated correctly if the task is migrated while the kernel is handling KVM_RUN. This is a regression test for a bug introduced by commit 72c3c0fe54a3 ("x86/kvm: Use generic xfer to guest work function"), where TIF_NOTIFY_RESUME would be cleared by KVM