On Fri, Nov 14, 2025 at 5:52 PM Yosry Ahmed yosry.ahmed@linux.dev wrote:
On Fri, Nov 14, 2025 at 08:34:54AM -0800, Sean Christopherson wrote:
On Wed, Nov 12, 2025, Yosry Ahmed wrote:
svm_update_lbrv() always updates LBR MSRs intercepts, even when they are already set correctly. This results in force_msr_bitmap_recalc always being set to true on every nested transition,
Nit, it's only on VMRUN, not on every transition (i.e. not on nested #VMEXIT).
How so? svm_update_lbrv() will also be called in nested_svm_vmexit(), and it will eventually lead to force_msr_bitmap_recalc being set to true.
I guess what you meant is the "undoing the Hyper-V optimization" part. That is indeed only affected by the svm_update_lbrv() call in the nested VMRUN path.
Yes, I'll make sure that's clear in the changelog.
Paolo, do you prefer a updated patch with the updated changelog, or fixing it up when you apply it?
I'll take care of it, thanks!
Paolo