A truly miscellaneous collection of patches this time around. David M's PML fix obviously belongs in the MMU pull request, but I applied it to the wrong branch and didn't want to rebase for such a silly thing. The following changes since commit 5804c19b80bf625c6a9925317f845e497434d6d3: Merge tag 'kvm-riscv-fixes-6.6-1' of https://github.com/kvm-riscv/linux into HEAD (2023-09-23 05:35:55 -0400) are available in the Git repository at: https://github.com/kvm-x86/linux.git tags/kvm-x86-misc-6.7 for you to fetch changes up to 2770d4722036d6bd24bcb78e9cd7f6e572077d03: KVM: x86: Ignore MSR_AMD64_TW_CFG access (2023-10-19 10:55:14 -0700) ---------------------------------------------------------------- KVM x86 misc changes for 6.7: - Add CONFIG_KVM_MAX_NR_VCPUS to allow supporting up to 4096 vCPUs without forcing more common use cases to eat the extra memory overhead. - Add IBPB and SBPB virtualization support. - Fix a bug where restoring a vCPU snapshot that was taken within 1 second of creating the original vCPU would cause KVM to try to synchronize the vCPU's TSC and thus clobber the correct TSC being set by userspace. - Compute guest wall clock using a single TSC read to avoid generating an inaccurate time, e.g. if the vCPU is preempted between multiple TSC reads. - "Virtualize" HWCR.TscFreqSel to make Linux guests happy, which complain about a "Firmware Bug" if the bit isn't set for select F/M/S combos. - Don't apply side effects to Hyper-V's synthetic timer on writes from userspace to fix an issue where the auto-enable behavior can trigger spurious interrupts, i.e. do auto-enabling only for guest writes. - Remove an unnecessary kick of all vCPUs when synchronizing the dirty log without PML enabled. - Advertise "support" for non-serializing FS/GS base MSR writes as appropriate. - Use octal notation for file permissions through KVM x86. - Fix a handful of typo fixes and warts. ---------------------------------------------------------------- David Matlack (1): KVM: x86/mmu: Stop kicking vCPUs to sync the dirty log when PML is disabled David Woodhouse (1): KVM: x86: Refine calculation of guest wall clock to use a single TSC read Dongli Zhang (1): KVM: x86: remove always-false condition in kvmclock_sync_fn Jim Mattson (4): KVM: x86: Allow HWCR.McStatusWrEn to be cleared once set KVM: x86: Virtualize HWCR.TscFreqSel[bit 24] KVM: selftests: Test behavior of HWCR, a.k.a. MSR_K7_HWCR x86: KVM: Add feature flag for CPUID.80000021H:EAX[bit 1] Josh Poimboeuf (2): KVM: x86: Add IBPB_BRTYPE support KVM: x86: Add SBPB support Kyle Meyer (1): KVM: x86: Add CONFIG_KVM_MAX_NR_VCPUS to allow up to 4096 vCPUs Liang Chen (1): KVM: x86: remove the unused assigned_dev_head from kvm_arch Like Xu (1): KVM: x86: Don't sync user-written TSC against startup values Maciej S. Szmigiero (1): KVM: x86: Ignore MSR_AMD64_TW_CFG access Michal Luczaj (2): KVM: x86: Remove redundant vcpu->arch.cr0 assignments KVM: x86: Force TLB flush on userspace changes to special registers Mingwei Zhang (1): KVM: x86: Update the variable naming in kvm_x86_ops.sched_in() Nicolas Saenz Julienne (1): KVM: x86: hyper-v: Don't auto-enable stimer on write from user-space Peng Hao (1): KVM: x86: Use octal for file permission arch/x86/include/asm/cpufeatures.h | 1 + arch/x86/include/asm/kvm_host.h | 12 +- arch/x86/include/asm/msr-index.h | 1 + arch/x86/kvm/Kconfig | 11 ++ arch/x86/kvm/cpuid.c | 8 +- arch/x86/kvm/cpuid.h | 3 +- arch/x86/kvm/hyperv.c | 10 +- arch/x86/kvm/smm.c | 1 - arch/x86/kvm/svm/svm.c | 2 +- arch/x86/kvm/vmx/vmx.c | 20 +-- arch/x86/kvm/x86.c | 195 ++++++++++++++++----- arch/x86/kvm/x86.h | 1 + arch/x86/kvm/xen.c | 4 +- tools/testing/selftests/kvm/Makefile | 1 + tools/testing/selftests/kvm/x86_64/hwcr_msr_test.c | 47 +++++ 15 files changed, 251 insertions(+), 66 deletions(-) create mode 100644 tools/testing/selftests/kvm/x86_64/hwcr_msr_test.c
