blaster4385/linux-IllusionX/Documentation/virt, branch v6.12.1

KVM: x86: Clean up documentation for KVM_X86_QUIRK_SLOT_ZAP_ALL

2024-10-20T11:31:05Z

Massage the documentation for KVM_X86_QUIRK_SLOT_ZAP_ALL to call out that it applies to moved memslots as well as deleted memslots, to avoid KVM's "fast zap" terminology (which has no meaning for userspace), and to reword the documented targeted zap behavior to specifically say that KVM _may_ zap a subset of all SPTEs. As evidenced by the fix to zap non-leafs SPTEs with gPTEs, formally documenting KVM's exact internal behavior is risky and unnecessary. Signed-off-by: Sean Christopherson Message-ID: <20241009192345.1148353-4-seanjc@google.com> Signed-off-by: Paolo Bonzini

KVM: Remove unused kvm_vcpu_gfn_to_pfn_atomic

2024-10-20T11:05:51Z

The last use of kvm_vcpu_gfn_to_pfn_atomic was removed by commit 1bbc60d0c7e5 ("KVM: x86/mmu: Remove MMU auditing") Remove it. Signed-off-by: Dr. David Alan Gilbert Message-ID: <20241001141354.18009-3-linux@treblig.org> [Adjust Documentation/virt/kvm/locking.rst. - Paolo] Signed-off-by: Paolo Bonzini

Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

2024-09-28T16:20:14Z

Pull x86 kvm updates from Paolo Bonzini: "x86: - KVM currently invalidates the entirety of the page tables, not just those for the memslot being touched, when a memslot is moved or deleted. This does not traditionally have particularly noticeable overhead, but Intel's TDX will require the guest to re-accept private pages if they are dropped from the secure EPT, which is a non starter. Actually, the only reason why this is not already being done is a bug which was never fully investigated and caused VM instability with assigned GeForce GPUs, so allow userspace to opt into the new behavior. - Advertise AVX10.1 to userspace (effectively prep work for the "real" AVX10 functionality that is on the horizon) - Rework common MSR handling code to suppress errors on userspace accesses to unsupported-but-advertised MSRs This will allow removing (almost?) all of KVM's exemptions for userspace access to MSRs that shouldn't exist based on the vCPU model (the actual cleanup is non-trivial future work) - Rework KVM's handling of x2APIC ICR, again, because AMD (x2AVIC) splits the 64-bit value into the legacy ICR and ICR2 storage, whereas Intel (APICv) stores the entire 64-bit value at the ICR offset - Fix a bug where KVM would fail to exit to userspace if one was triggered by a fastpath exit handler - Add fastpath handling of HLT VM-Exit to expedite re-entering the guest when there's already a pending wake event at the time of the exit - Fix a WARN caused by RSM entering a nested guest from SMM with invalid guest state, by forcing the vCPU out of guest mode prior to signalling SHUTDOWN (the SHUTDOWN hits the VM altogether, not the nested guest) - Overhaul the "unprotect and retry" logic to more precisely identify cases where retrying is actually helpful, and to harden all retry paths against putting the guest into an infinite retry loop - Add support for yielding, e.g. to honor NEED_RESCHED, when zapping rmaps in the shadow MMU - Refactor pieces of the shadow MMU related to aging SPTEs in prepartion for adding multi generation LRU support in KVM - Don't stuff the RSB after VM-Exit when RETPOLINE=y and AutoIBRS is enabled, i.e. when the CPU has already flushed the RSB - Trace the per-CPU host save area as a VMCB pointer to improve readability and cleanup the retrieval of the SEV-ES host save area - Remove unnecessary accounting of temporary nested VMCB related allocations - Set FINAL/PAGE in the page fault error code for EPT violations if and only if the GVA is valid. If the GVA is NOT valid, there is no guest-side page table walk and so stuffing paging related metadata is nonsensical - Fix a bug where KVM would incorrectly synthesize a nested VM-Exit instead of emulating posted interrupt delivery to L2 - Add a lockdep assertion to detect unsafe accesses of vmcs12 structures - Harden eVMCS loading against an impossible NULL pointer deref (really truly should be impossible) - Minor SGX fix and a cleanup - Misc cleanups Generic: - Register KVM's cpuhp and syscore callbacks when enabling virtualization in hardware, as the sole purpose of said callbacks is to disable and re-enable virtualization as needed - Enable virtualization when KVM is loaded, not right before the first VM is created Together with the previous change, this simplifies a lot the logic of the callbacks, because their very existence implies virtualization is enabled - Fix a bug that results in KVM prematurely exiting to userspace for coalesced MMIO/PIO in many cases, clean up the related code, and add a testcase - Fix a bug in kvm_clear_guest() where it would trigger a buffer overflow _if_ the gpa+len crosses a page boundary, which thankfully is guaranteed to not happen in the current code base. Add WARNs in more helpers that read/write guest memory to detect similar bugs Selftests: - Fix a goof that caused some Hyper-V tests to be skipped when run on bare metal, i.e. NOT in a VM - Add a regression test for KVM's handling of SHUTDOWN for an SEV-ES guest - Explicitly include one-off assets in .gitignore. Past Sean was completely wrong about not being able to detect missing .gitignore entries - Verify userspace single-stepping works when KVM happens to handle a VM-Exit in its fastpath - Misc cleanups" * tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (127 commits) Documentation: KVM: fix warning in "make htmldocs" s390: Enable KVM_S390_UCONTROL config in debug_defconfig selftests: kvm: s390: Add VM run test case KVM: SVM: let alternatives handle the cases when RSB filling is required KVM: VMX: Set PFERR_GUEST_{FINAL,PAGE}_MASK if and only if the GVA is valid KVM: x86/mmu: Use KVM_PAGES_PER_HPAGE() instead of an open coded equivalent KVM: x86/mmu: Add KVM_RMAP_MANY to replace open coded '1' and '1ul' literals KVM: x86/mmu: Fold mmu_spte_age() into kvm_rmap_age_gfn_range() KVM: x86/mmu: Morph kvm_handle_gfn_range() into an aging specific helper KVM: x86/mmu: Honor NEED_RESCHED when zapping rmaps and blocking is allowed KVM: x86/mmu: Add a helper to walk and zap rmaps for a memslot KVM: x86/mmu: Plumb a @can_yield parameter into __walk_slot_rmaps() KVM: x86/mmu: Move walk_slot_rmaps() up near for_each_slot_rmap_range() KVM: x86/mmu: WARN on MMIO cache hit when emulating write-protected gfn KVM: x86/mmu: Detect if unprotect will do anything based on invalid_list KVM: x86/mmu: Subsume kvm_mmu_unprotect_page() into the and_retry() version KVM: x86: Rename reexecute_instruction()=>kvm_unprotect_and_retry_on_failure() KVM: x86: Update retry protection fields when forcing retry on emulation failure KVM: x86: Apply retry protection to "unprotect on failure" path KVM: x86: Check EMULTYPE_WRITE_PF_TO_SP before unprotecting gfn ...

Merge tag 'uml-for-linus-6.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/uml/linux

2024-09-27T19:48:48Z

Pull UML updates from Richard Weinberger: - Removal of dead code (TT mode leftovers, etc) - Fixes for the network vector driver - Fixes for time-travel mode * tag 'uml-for-linus-6.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/uml/linux: um: fix time-travel syscall scheduling hack um: Remove outdated asm/sysrq.h header um: Remove the declaration of user_thread function um: Remove the call to SUBARCH_EXECVE1 macro um: Remove unused mm_fd field from mm_id um: Remove unused fields from thread_struct um: Remove the redundant newpage check in update_pte_range um: Remove unused kpte_clear_flush macro um: Remove obsoleted declaration for execute_syscall_skas user_mode_linux_howto_v2: add VDE vector support in doc vector_user: add VDE support um: remove ARCH_NO_PREEMPT_DYNAMIC um: vector: Fix NAPI budget handling um: vector: Replace locks guarding queue depth with atomics um: remove variable stack array in os_rcv_fd_msg()

Documentation: KVM: fix warning in "make htmldocs"

2024-09-27T15:45:50Z

The warning Documentation/virt/kvm/locking.rst:31: ERROR: Unexpected indentation. is caused by incorrectly treating a line as the continuation of a paragraph, rather than as the first line in a bullet list. Fixed: 44d174596260 ("KVM: Use dedicated mutex to protect kvm_usage_count to avoid deadlock") Signed-off-by: Paolo Bonzini

Merge tag 'kvm-x86-vmx-6.12' of https://github.com/kvm-x86/linux into HEAD

2024-09-17T16:41:23Z

KVM VMX changes for 6.12: - Set FINAL/PAGE in the page fault error code for EPT Violations if and only if the GVA is valid. If the GVA is NOT valid, there is no guest-side page table walk and so stuffing paging related metadata is nonsensical. - Fix a bug where KVM would incorrectly synthesize a nested VM-Exit instead of emulating posted interrupt delivery to L2. - Add a lockdep assertion to detect unsafe accesses of vmcs12 structures. - Harden eVMCS loading against an impossible NULL pointer deref (really truly should be impossible). - Minor SGX fix and a cleanup.

Merge tag 'docs-6.12' of git://git.lwn.net/linux

2024-09-17T14:44:08Z

Pull documentation update from Jonathan Corbet: "Another relatively mundane cycle for docs: - The beginning of an EEVDF scheduler document - More Chinese translations - A rethrashing of our bisection documentation ...plus the usual array of smaller fixes, and more than the usual number of typo fixes" * tag 'docs-6.12' of git://git.lwn.net/linux: (48 commits) Remove duplicate "and" in 'Linux NVMe docs. docs:filesystems: fix spelling and grammar mistakes docs:filesystem: fix mispelled words on autofs page docs:mm: fixed spelling and grammar mistakes on vmalloc kernel stack page Documentation: PCI: fix typo in pci.rst docs/zh_CN: add the translation of kbuild/gcc-plugins.rst docs/process: fix typos docs:mm: fix spelling mistakes in heterogeneous memory management page accel/qaic: Fix a typo docs/zh_CN: update the translation of security-bugs docs: block: Fix grammar and spelling mistakes in bfq-iosched.rst Documentation: Fix spelling mistakes Documentation/gpu: Fix typo in Documentation/gpu/komeda-kms.rst scripts: sphinx-pre-install: remove unnecessary double check for $cur_version Loongarch: KVM: Add KVM hypercalls documentation for LoongArch Documentation: Document the kernel flag bdev_allow_write_mounted docs: scheduler: completion: Update member of struct completion docs: kerneldoc-preamble.sty: Suppress extra spaces in CJK literal blocks docs: submitting-patches: Advertise b4 docs: update dev-tools/kcsan.rst url about KTSAN ...

Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

2024-09-16T04:55:07Z

Pull arm64 updates from Will Deacon: "The highlights are support for Arm's "Permission Overlay Extension" using memory protection keys, support for running as a protected guest on Android as well as perf support for a bunch of new interconnect PMUs. Summary: ACPI: - Enable PMCG erratum workaround for HiSilicon HIP10 and 11 platforms. - Ensure arm64-specific IORT header is covered by MAINTAINERS. CPU Errata: - Enable workaround for hardware access/dirty issue on Ampere-1A cores. Memory management: - Define PHYSMEM_END to fix a crash in the amdgpu driver. - Avoid tripping over invalid kernel mappings on the kexec() path. - Userspace support for the Permission Overlay Extension (POE) using protection keys. Perf and PMUs: - Add support for the "fixed instruction counter" extension in the CPU PMU architecture. - Extend and fix the event encodings for Apple's M1 CPU PMU. - Allow LSM hooks to decide on SPE permissions for physical profiling. - Add support for the CMN S3 and NI-700 PMUs. Confidential Computing: - Add support for booting an arm64 kernel as a protected guest under Android's "Protected KVM" (pKVM) hypervisor. Selftests: - Fix vector length issues in the SVE/SME sigreturn tests - Fix build warning in the ptrace tests. Timers: - Add support for PR_{G,S}ET_TSC so that 'rr' can deal with non-determinism arising from the architected counter. Miscellaneous: - Rework our IPI-based CPU stopping code to try NMIs if regular IPIs don't succeed. - Minor fixes and cleanups" * tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (94 commits) perf: arm-ni: Fix an NULL vs IS_ERR() bug arm64: hibernate: Fix warning for cast from restricted gfp_t arm64: esr: Define ESR_ELx_EC_* constants as UL arm64: pkeys: remove redundant WARN perf: arm_pmuv3: Use BR_RETIRED for HW branch event if enabled MAINTAINERS: List Arm interconnect PMUs as supported perf: Add driver for Arm NI-700 interconnect PMU dt-bindings/perf: Add Arm NI-700 PMU perf/arm-cmn: Improve format attr printing perf/arm-cmn: Clean up unnecessary NUMA_NO_NODE check arm64/mm: use lm_alias() with addresses passed to memblock_free() mm: arm64: document why pte is not advanced in contpte_ptep_set_access_flags() arm64: Expose the end of the linear map in PHYSMEM_END arm64: trans_pgd: mark PTEs entries as valid to avoid dead kexec() arm64/mm: Delete __init region from memblock.reserved perf/arm-cmn: Support CMN S3 dt-bindings: perf: arm-cmn: Add CMN S3 perf/arm-cmn: Refactor DTC PMU register access perf/arm-cmn: Make cycle counts less surprising perf/arm-cmn: Improve build-time assertion ...

user_mode_linux_howto_v2: add VDE vector support in doc

2024-09-12T18:18:51Z

Add a description of the VDE vector transport in user_mode_linux_howto_v2.rst. Signed-off-by: Renzo Davoli Signed-off-by: Renzo Davoi Acked-by: Randy Dunlap Signed-off-by: Richard Weinberger

Merge tag 'hyperv-fixes-signed-20240908' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux

2024-09-09T16:31:55Z

Pull hyperv fixes from Wei Liu: - Add a documentation overview of Confidential Computing VM support (Michael Kelley) - Use lapic timer in a TDX VM without paravisor (Dexuan Cui) - Set X86_FEATURE_TSC_KNOWN_FREQ when Hyper-V provides frequency (Michael Kelley) - Fix a kexec crash due to VP assist page corruption (Anirudh Rayabharam) - Python3 compatibility fix for lsvmbus (Anthony Nandaa) - Misc fixes (Rachel Menge, Roman Kisel, zhang jiao, Hongbo Li) * tag 'hyperv-fixes-signed-20240908' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux: hv: vmbus: Constify struct kobj_type and struct attribute_group tools: hv: rm .*.cmd when make clean x86/hyperv: fix kexec crash due to VP assist page corruption Drivers: hv: vmbus: Fix the misplaced function description tools: hv: lsvmbus: change shebang to use python3 x86/hyperv: Set X86_FEATURE_TSC_KNOWN_FREQ when Hyper-V provides frequency Documentation: hyperv: Add overview of Confidential Computing VM support clocksource: hyper-v: Use lapic timer in a TDX VM without paravisor Drivers: hv: Remove deprecated hv_fcopy declarations