On Thu, May 22, 2025, Sean Christopherson wrote: > This is the combination of Kevin's WBNOINVD series[1] with Zheyun's targeted > flushing series[2]. The combined goal is to use WBNOINVD instead of WBINVD > when doing cached maintenance to prevent data corruption due to C-bit aliasing, > and to reduce the number of cache invalidations by only performing flushes on > CPUs that have entered the relevant VM since the last cache flush. > > All of the non-KVM patches are frontloaded and based on v6.15-rc7, so that > they can go through the tip tree (in a stable branch, please :-) ). Tip tree folks, any feedback/thoughts on this series (patches 1-4 in particular)? It'd be nice to get this into 6.17, and I'd really like land it by 6.18 at the latest. > Kevin Loughlin (2): > x86, lib: Add WBNOINVD helper functions > KVM: SEV: Prefer WBNOINVD over WBINVD for cache maintenance efficiency > > Sean Christopherson (3): > drm/gpu: Remove dead checks on wbinvd_on_all_cpus()'s return value > x86, lib: Drop the unused return value from wbinvd_on_all_cpus() > KVM: x86: Use wbinvd_on_cpu() instead of an open-coded equivalent > > Zheyun Shen (3): > x86, lib: Add wbinvd and wbnoinvd helpers to target multiple CPUs > KVM: SVM: Remove wbinvd in sev_vm_destroy() > KVM: SVM: Flush cache only on CPUs running SEV guest > > arch/x86/include/asm/smp.h | 23 +++++++- > arch/x86/include/asm/special_insns.h | 32 ++++++++++- > arch/x86/kvm/svm/sev.c | 85 +++++++++++++++++++--------- > arch/x86/kvm/svm/svm.h | 1 + > arch/x86/kvm/x86.c | 11 +--- > arch/x86/lib/cache-smp.c | 26 ++++++++- > drivers/gpu/drm/drm_cache.c | 9 +-- > 7 files changed, 140 insertions(+), 47 deletions(-) > > > base-commit: a5806cd506af5a7c19bcd596e4708b5c464bfd21 > -- > 2.49.0.1151.ga128411c76-goog >
