Re: [PATCH v4 0/5] KVM: SVM: Add Bus Lock Detect support and refactor LBRV

[Sean Christopherson <seanjc@google.com>]

On Tue, Jul 21, 2026, Shivansh Dhiman wrote:
> Shivansh Dhiman (5):
>   KVM: SVM: Refactor svm_update_lbrv()
>   KVM: nSVM: Disable LBRV in nested control cache when unsupported
>   KVM: nSVM: Sanitize nested DR6 using kvm_dr6_fixed()
>   KVM: SVM: Turn DEBUGCTL_RESERVED_BITS into a helper
>   KVM: SVM: Add Bus Lock Detect support

I'll send a v5 as I have variety of changes (I already responded to each patch),
and I'm not in the mood to deal with another version as I'm quite grumpy that no
one bothered to follow up on Sashiko's bug report, or to write tests.

I'll also post a KUT testcase, which I created to verify the bug Sashiko pointed
out as well as the fix. 

>  arch/x86/kvm/regs.c       |  3 ++-
>  arch/x86/kvm/regs.h       |  1 +
>  arch/x86/kvm/svm/nested.c | 26 ++++++++++++++------------
>  arch/x86/kvm/svm/svm.c    | 28 ++++++++++++++++++++--------
>  arch/x86/kvm/svm/svm.h    | 13 +++++++++++--
>  5 files changed, 48 insertions(+), 23 deletions(-)