On Fri, May 9, 2025 at 9:01 PM Sean Christopherson <seanjc@xxxxxxxxxx> wrote: > Please pull a random variety of fixes for 6.15. The SRSO change is the > most urgent fix, everything else has either existed for some time, or isn't > actively causing problems. Cool, thanks; pulled. Paolo > The following changes since commit 2d7124941a273c7233849a7a2bbfbeb7e28f1caa: > > Merge tag 'kvmarm-fixes-6.15-2' of https://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into HEAD (2025-04-24 13:28:53 -0400) > > are available in the Git repository at: > > https://github.com/kvm-x86/linux.git tags/kvm-x86-fixes-6.15-rcN > > for you to fetch changes up to e3417ab75ab2e7dca6372a1bfa26b1be3ac5889e: > > KVM: SVM: Set/clear SRSO's BP_SPEC_REDUCE on 0 <=> 1 VM count transitions (2025-05-08 07:17:10 -0700) > > ---------------------------------------------------------------- > KVM x86 fixes for 6.15-rcN > > - Forcibly leave SMM on SHUTDOWN interception on AMD CPUs to avoid causing > problems due to KVM stuffing INIT on SHUTDOWN (KVM needs to sanitize the > VMCB as its state is undefined after SHUTDOWN, emulating INIT is the > least awful choice). > > - Track the valid sync/dirty fields in kvm_run as a u64 to ensure KVM > KVM doesn't goof a sanity check in the future. > > - Free obsolete roots when (re)loading the MMU to fix a bug where > pre-faulting memory can get stuck due to always encountering a stale > root. > > - When dumping GHCB state, use KVM's snapshot instead of the raw GHCB page > to print state, so that KVM doesn't print stale/wrong information. > > - When changing memory attributes (e.g. shared <=> private), add potential > hugepage ranges to the mmu_invalidate_range_{start,end} set so that KVM > doesn't create a shared/private hugepage when the the corresponding > attributes will become mixed (the attributes are commited *after* KVM > finishes the invalidation). > > - Rework the SRSO mitigation to enable BP_SPEC_REDUCE only when KVM has at > least one active VM. Effectively BP_SPEC_REDUCE when KVM is loaded led > to very measurable performance regressions for non-KVM workloads. > > ---------------------------------------------------------------- > Dan Carpenter (1): > KVM: x86: Check that the high 32bits are clear in kvm_arch_vcpu_ioctl_run() > > Mikhail Lobanov (1): > KVM: SVM: Forcibly leave SMM mode on SHUTDOWN interception > > Sean Christopherson (2): > KVM: x86/mmu: Prevent installing hugepages when mem attributes are changing > KVM: SVM: Set/clear SRSO's BP_SPEC_REDUCE on 0 <=> 1 VM count transitions > > Tom Lendacky (1): > KVM: SVM: Update dump_ghcb() to use the GHCB snapshot fields > > Yan Zhao (1): > KVM: x86/mmu: Check and free obsolete roots in kvm_mmu_reload() > > arch/x86/kvm/mmu.h | 3 ++ > arch/x86/kvm/mmu/mmu.c | 70 +++++++++++++++++++++++++++++++++++----------- > arch/x86/kvm/smm.c | 1 + > arch/x86/kvm/svm/sev.c | 32 ++++++++++++--------- > arch/x86/kvm/svm/svm.c | 75 ++++++++++++++++++++++++++++++++++++++++++++++---- > arch/x86/kvm/svm/svm.h | 2 ++ > arch/x86/kvm/x86.c | 4 +-- > 7 files changed, 150 insertions(+), 37 deletions(-) >
