linux/Documentation/virt, branch v6.7

Merge tag 'kvmarm-6.7' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into HEAD

2023-10-31T20:37:07Z

KVM/arm64 updates for 6.7 - Generalized infrastructure for 'writable' ID registers, effectively allowing userspace to opt-out of certain vCPU features for its guest - Optimization for vSGI injection, opportunistically compressing MPIDR to vCPU mapping into a table - Improvements to KVM's PMU emulation, allowing userspace to select the number of PMCs available to a VM - Guest support for memory operation instructions (FEAT_MOPS) - Cleanups to handling feature flags in KVM_ARM_VCPU_INIT, squashing bugs and getting rid of useless code - Changes to the way the SMCCC filter is constructed, avoiding wasted memory allocations when not in use - Load the stage-2 MMU context at vcpu_load() for VHE systems, reducing the overhead of errata mitigations - Miscellaneous kernel and selftest fixes

Merge tag 'kvm-x86-docs-6.7' of https://github.com/kvm-x86/linux into HEAD

2023-10-31T14:12:45Z

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.

Merge branch kvm-arm64/writable-id-regs into kvmarm/next

2023-10-30T20:21:09Z

* kvm-arm64/writable-id-regs: : Writable ID registers, courtesy of Jing Zhang : : This series significantly expands the architectural feature set that : userspace can manipulate via the ID registers. A new ioctl is defined : that makes the mutable fields in the ID registers discoverable to : userspace. KVM: selftests: Avoid using forced target for generating arm64 headers tools headers arm64: Fix references to top srcdir in Makefile KVM: arm64: selftests: Test for setting ID register from usersapce tools headers arm64: Update sysreg.h with kernel sources KVM: selftests: Generate sysreg-defs.h and add to include path perf build: Generate arm64's sysreg-defs.h and add to include path tools: arm64: Add a Makefile for generating sysreg-defs.h KVM: arm64: Document vCPU feature selection UAPIs KVM: arm64: Allow userspace to change ID_AA64ZFR0_EL1 KVM: arm64: Allow userspace to change ID_AA64PFR0_EL1 KVM: arm64: Allow userspace to change ID_AA64MMFR{0-2}_EL1 KVM: arm64: Allow userspace to change ID_AA64ISAR{0-2}_EL1 KVM: arm64: Bump up the default KVM sanitised debug version to v8p8 KVM: arm64: Reject attempts to set invalid debug arch version KVM: arm64: Advertise selected DebugVer in DBGDIDR.Version KVM: arm64: Use guest ID register values for the sake of emulation KVM: arm64: Document KVM_ARM_GET_REG_WRITABLE_MASKS KVM: arm64: Allow userspace to get the writable masks for feature ID registers Signed-off-by: Oliver Upton

KVM: arm64: Document vCPU feature selection UAPIs

2023-10-04T17:11:51Z

KVM/arm64 has a couple schemes for handling vCPU feature selection now, which is a lot to put on userspace. Add some documentation about how these interact and provide some recommendations for how to use the writable ID register scheme. Reviewed-by: Marc Zyngier Link: https://lore.kernel.org/r/20231003230408.3405722-11-oliver.upton@linux.dev Signed-off-by: Oliver Upton

KVM: arm64: Document KVM_ARM_GET_REG_WRITABLE_MASKS

2023-10-04T17:10:15Z

Add some basic documentation on how to get feature ID register writable masks from userspace. Signed-off-by: Jing Zhang Reviewed-by: Cornelia Huck Reviewed-by: Marc Zyngier Link: https://lore.kernel.org/r/20231003230408.3405722-3-oliver.upton@linux.dev Signed-off-by: Oliver Upton

LoongArch: KVM: Supplement kvm document about LoongArch-specific part

2023-10-02T02:01:29Z

Supplement kvm document about LoongArch-specific part, such as add api introduction for GET/SET_ONE_REG, GET/SET_FPU, GET/SET_MP_STATE, etc. Reviewed-by: Huacai Chen Signed-off-by: Tianrui Zhao Signed-off-by: Huacai Chen

KVM: arm64: Clarify the ordering requirements for vcpu/RD creation

2023-09-30T18:15:44Z

It goes without saying, but it is probably better to spell it out: If userspace tries to restore and VM, but creates vcpus and/or RDs in a different order, the vcpu/RD mapping will be different. Yes, our API is an ugly piece of crap and I can't believe that we missed this. If we want to relax the above, we'll need to define a new userspace API that allows the mapping to be specified, rather than relying on the kernel to perform the mapping on its own. Reviewed-by: Zenghui Yu Signed-off-by: Marc Zyngier Link: https://lore.kernel.org/r/20230927090911.3355209-12-maz@kernel.org Signed-off-by: Oliver Upton

KVM: x86/pmu: Add documentation for fixed ctr on PMU filter

2023-09-27T21:23:51Z

Update the documentation for the KVM_SET_PMU_EVENT_FILTER ioctl to include a detailed description of how fixed performance events are handled in the pmu filter. The action and fixed_counter_bitmap members of the pmu filter to determine whether fixed performance events can be programmed by the guest. This information is helpful for correctly configuring the fixed_counter_bitmap and action fields to filter fixed performance events. Suggested-by: Like Xu Reported-by: kernel test robot Link: https://lore.kernel.org/oe-kbuild-all/202304150850.rx4UDDsB-lkp@intel.com Signed-off-by: Jinrong Liang Link: https://lore.kernel.org/r/20230531075052.43239-1-cloudliang@tencent.com Signed-off-by: Sean Christopherson

KVM: Documentation: Add the missing description for tdp_mmu_page into kvm_mmu_page

2023-09-27T20:32:18Z

Add the description for tdp_mmu_page into kvm_mmu_page description. tdp_mmu_page is a field to differentiate shadow pages from TDP MMU and non-TDP MMU. Signed-off-by: Mingwei Zhang Reviewed-by: Kai Huang Link: https://lore.kernel.org/r/20230912184553.1887764-7-mizhang@google.com Signed-off-by: Sean Christopherson

KVM: Documentation: Add the missing description for mmu_valid_gen into kvm_mmu_page

2023-09-27T20:29:32Z

Add the description for mmu_valid_gen into kvm_mmu_page description. mmu_valid_gen is used in shadow MMU for fast zapping. Update the doc to reflect that. Signed-off-by: Mingwei Zhang Reviewed-by: Kai Huang Link: https://lore.kernel.org/r/20230912184553.1887764-6-mizhang@google.com Signed-off-by: Sean Christopherson