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  1. 31 Oct, 2023 10 commits
    • Paolo Bonzini's avatar
      Merge tag 'kvm-x86-svm-6.7' of https://github.com/kvm-x86/linux into HEAD · be479419
      Paolo Bonzini authored 
      KVM SVM changes for 6.7:

 - Report KVM_EXIT_SHUTDOWN instead of EINVAL if KVM intercepts SHUTDOWN while
   running an SEV-ES guest.

 - Clean up handling "failures" when KVM detects it can't emulate the "skip"
   action for an instruction that has already been partially emulated.  Drop a
   hack in the SVM code that was fudging around the emulator code not giving
   SVM enough information to do the right thing.
      be479419
    • Paolo Bonzini's avatar
      Merge tag 'kvm-x86-pmu-6.7' of https://github.com/kvm-x86/linux into HEAD · d5cde2e0
      Paolo Bonzini authored 
      KVM PMU change for 6.7:

 - Handle NMI/SMI requests after PMU/PMI requests so that a PMI=>NMI doesn't
   require redoing the entire run loop due to the NMI not being detected until
   the final kvm_vcpu_exit_request() check before entering the guest.
      d5cde2e0
    • Paolo Bonzini's avatar
      Merge tag 'kvm-x86-xen-6.7' of https://github.com/kvm-x86/linux into HEAD · e122d7a1
      Paolo Bonzini authored 
      KVM x86 Xen changes for 6.7:

 - Omit "struct kvm_vcpu_xen" entirely when CONFIG_KVM_XEN=n.

 - Use the fast path directly from the timer callback when delivering Xen timer
   events.  Avoid the problematic races with using the fast path by ensuring
   the hrtimer isn't running when (re)starting the timer or saving the timer
   information (for userspace).

 - Follow the lead of upstream Xen and ignore the VCPU_SSHOTTMR_future flag.
      e122d7a1
    • Paolo Bonzini's avatar
      Merge tag 'kvm-x86-mmu-6.7' of https://github.com/kvm-x86/linux into HEAD · f0f59d06
      Paolo Bonzini authored 
      KVM x86 MMU changes for 6.7:

 - Clean up code that deals with honoring guest MTRRs when the VM has
   non-coherent DMA and host MTRRs are ignored, i.e. EPT is enabled.

 - Zap EPT entries when non-coherent DMA assignment stops/start to prevent
   using stale entries with the wrong memtype.

 - Don't ignore guest PAT for CR0.CD=1 && KVM_X86_QUIRK_CD_NW_CLEARED=y, as
   there's zero reason to ignore guest PAT if the effective MTRR memtype is WB.
   This will also allow for future optimizations of handling guest MTRR updates
   for VMs with non-coherent DMA and the quirk enabled.

 - Harden the fast page fault path to guard against encountering an invalid
   root when walking SPTEs.
      f0f59d06
    • Paolo Bonzini's avatar
      Merge tag 'kvm-x86-misc-6.7' of https://github.com/kvm-x86/linux into HEAD · f292dc8a
      Paolo Bonzini authored 
      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.
      f292dc8a
    • Paolo Bonzini's avatar
      Merge tag 'kvm-x86-docs-6.7' of https://github.com/kvm-x86/linux into HEAD · fadaf574
      Paolo Bonzini authored 
      KVM x86 Documentation updates for 6.7:

 - Fix various typos, notably a confusing reference to the non-existent
   "struct kvm_vcpu_event" (the actual structure is kvm_vcpu_events, plural).

 - Update x86's kvm_mmu_page documentation to bring it closer to the code
   (this raced with the removal of async zapping and so the documentation is
   already stale; my bad).

 - Document the behavior of x86 PMU filters on fixed counters.
      fadaf574
    • Paolo Bonzini's avatar
      Merge tag 'kvm-x86-apic-6.7' of https://github.com/kvm-x86/linux into HEAD · f2336467
      Paolo Bonzini authored 
      KVM x86 APIC changes for 6.7:

 - Purge VMX's posted interrupt descriptor *before* loading APIC state when
   handling KVM_SET_LAPIC.  Purging the PID after loading APIC state results in
   lost APIC timer IRQs as the APIC timer can be armed as part of loading APIC
   state, i.e. can immediately pend an IRQ if the expiry is in the past.

 - Clear the ICR.BUSY bit when handling trap-like x2APIC writes.  This avoids a
   WARN, due to KVM expecting the BUSY bit to be cleared when sending IPIs.
      f2336467
    • Paolo Bonzini's avatar
      Merge tag 'kvm-s390-next-6.7-1' of... · 140139c5
      Paolo Bonzini authored 
      Merge tag 'kvm-s390-next-6.7-1' of https://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into HEAD

- nested page table management performance counters
      140139c5
    • Paolo Bonzini's avatar
      Merge tag 'kvm-riscv-6.7-1' of https://github.com/kvm-riscv/linux into HEAD · 957eedc7
      Paolo Bonzini authored 
      KVM/riscv changes for 6.7

- Smstateen and Zicond support for Guest/VM
- Virtualized senvcfg CSR for Guest/VM
- Added Smstateen registers to the get-reg-list selftests
- Added Zicond to the get-reg-list selftests
- Virtualized SBI debug console (DBCN) for Guest/VM
- Added SBI debug console (DBCN) to the get-reg-list selftests
      957eedc7
    • Paolo Bonzini's avatar
      Merge tag 'loongarch-kvm-6.7' of... · ef12ea62
      Paolo Bonzini authored 
      Merge tag 'loongarch-kvm-6.7' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson into HEAD

LoongArch KVM changes for v6.7

Add LoongArch's KVM support. Loongson 3A5000/3A6000 supports hardware
assisted virtualization. With cpu virtualization, there are separate
hw-supported user mode and kernel mode in guest mode. With memory
virtualization, there are two-level hw mmu table for guest mode and host
mode. Also there is separate hw cpu timer with consant frequency in
guest mode, so that vm can migrate between hosts with different freq.
Currently, we are able to boot LoongArch Linux Guests.

Few key aspects of KVM LoongArch added by this series are:
1. Enable kvm hardware function when kvm module is loaded.
2. Implement VM and vcpu related ioctl interface such as vcpu create,
   vcpu run etc. GET_ONE_REG/SET_ONE_REG ioctl commands are use to
   get general registers one by one.
3. Hardware access about MMU, timer and csr are emulated in kernel.
4. Hardwares such as mmio and iocsr device are emulated in user space
   such as IPI, irqchips, pci devices etc.
      ef12ea62
  3. 30 Oct, 2023 1 commit
  5. 28 Oct, 2023 15 commits
  7. 27 Oct, 2023 14 commits
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