kernel/git/next/linux-next.git/virt/kvm, branch master

Merge branch 'next' of https://github.com/kvm-x86/linux.git

2026-07-10T12:28:18+00:00

Merge branch 'fixes' of https://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm.git

2026-07-10T10:46:38+00:00

Merge branches 'fixes', 'generic', 'irq_test', 'misc', 'svm' and 'vmx'

2026-07-09T14:47:56+00:00

* fixes: (13454 commits) KVM: nVMX: Don't use vmcs01.GUEST_CR3 to snapshot L1's CR3 when EPT is disabled KVM: nVMX: Move vTPR vs. TPR Threshold consistency check into "normal" checks KVM: x86: Ignore pending PV EOI if the vCPU has since disabled PV EOIs KVM: x86: Nullify irqfd->producer if updating IRTE for bypass fails Linux 7.2-rc2 netfs: Fix barriering when walking subrequest list Replace by more specific (c files) Replace by more specific (headers) parisc: #include for unlikely() in media: em28xx: Add include for struct usb_device_id LoongArch: KVM: Add include defining struct cpu_feature ALSA: hda/core: Add include defining struct hda_device_id usb: dwc2: Add include defining struct pci_device_id platform/x86: int3472: Add include defining struct dmi_system_id platform/x86: x86-android-tablets: Add include defining struct dmi_system_id i2c: Let i2c-core.h include of: Explicitly include and platform/x86: msi-ec: Ensure dmi_system_id is defined usb: serial: Include in driver core: platform: Include header for struct platform_device_id ... * generic: KVM: Remove kvm_debugfs_dir on kvm_init() error paths * irq_test: (13471 commits) KVM: selftests: Fix a spelling error in an xapic_ipi_test comment KVM: selftests: Add xAPIC support in eventfd IRQ test KVM: selftests: Make number of vCPUs configurable in IRQ test KVM: selftests: Verify vCPU migration during IRQ delivery in IRQ test KVM: selftests: Add a utility to pin a task to a random CPU, given a CPU set KVM: selftests: Add kvm_sched_getaffinity() wrapper and convert users KVM: selftests: Add kvm_gettid() wrapper and convert users KVM: selftests: Verify non-postable IRQ remapping in IRQ test KVM: selftests: Make number of IRQs configurable in IRQ test KVM: selftests: Add option to set empty routing between IRQs in eventfd IRQ test KVM: selftests: Verify interrupts are received when IRQ affinity changes in IRQ test KVM: selftests: Add a helper to set proc IRQ affinity for IRQ test KVM: selftests: Add VFIO device support to eventfd IRQ test KVM: selftests: Add helper to get host IRQ from device MSI-X for IRQ bypass test KVM: selftests: Add an irqfd send+receive (and later IRQ bypass) test KVM: selftests: Add helper to generate random u64 in range [min,max] KVM: selftests: Seed libc's RNG before using it to generate a seed for KVM's pRNG KVM: selftests: Initialize the default/global pRNG during kvm_selftest_init() KVM: selftests: Rename guest_rng to kvm_rng KVM: selftests: Add macros to read/write+sync to/from guest memory ... * misc: (38 commits) KVM: x86: Move nested_ops out of kvm_x86_ops, to global kvm_nested_ops KVM: x86: Add static calls for nested virtualization ops KVM: x86: Reject nested CAP enablement if nested virtualization is disabled KVM: x86: Move "struct kvm_vcpu_hv" and all children from kvm_host.h => hyperv.h KVM: x86: Move "struct kvm_apic_map" definition from kvm_host.h => lapic.h KVM: x86: Move KVM's arbitrary task switch reason enums to x86.h KVM: x86: Add static asserts to document connection b/w TSS structs and macros KVM: x86: Move KVM_GUESTDBG_VALID_MASK from kvm_host.h => x86.c KVM: x86: Move CR and DR macro definitions from kvm_host.h => regs.h KVM: x86: Pluralize the macro guard name for msrs.h KVM: x86/mmu: Annotate tdp_enabled as being read-mostly KVM: x86: Move the "APIC attention" macros from kvm_host.h => lapic.c KVM: Remove kvm_debugfs_dir on kvm_init() error paths KVM: x86/hyperv: Use {READ,WRITE}_ONCE for cross-task synic->active accesses KVM: x86/hyperv: Assert vCPU's mutex is held in to_hv_vcpu() KVM: x86: Treat a vCPU as unreachable if its index is invalid KVM: Move nVMX's lockdep logic for vcpu->mutex to a common helper KVM: Initialize a vCPU's index to '-1' while it's being created KVM: x86/xen: Punt singleshot timer hcalls to userspace if Xen vCPU ID isn't set KVM: x86/xen: Consolidate checks on Xen vCPU ID for singleshot timer hypercalls ... * svm: KVM: SVM: Remove redundant ret = 0 in svm_set_nested_state KVM: selftests: Verify SNP VMs are rejected from migration and mirroring KVM: SEV: Do not allow intra-host migration/mirroring of SNP VMs KVM: SVM: Remove VM from the GA Log notifier list before VM destruction KVM: SVM: Do all per-VM AVIC initialization during vCPU precreation phase KVM: SVM: Make kvm_x86_ops.vcpu_precreate() hook fully AVIC specific * vmx: KVM: VMX: Use cached vcpu_vmx pointer in MSR and segment helpers

KVM: Remove kvm_debugfs_dir on kvm_init() error paths

2026-07-08T20:42:51+00:00

kvm_init_debug() runs before several steps that can fail (kvm_vfio_ops_init(), kvm_gmem_init(), kvm_init_virtualization() and misc_register()), but none of the corresponding error labels remove the "kvm" debugfs directory. Any failure after kvm_init_debug() therefore leaks the directory and its stat files for the lifetime of the boot. kvm_exit() already calls debugfs_remove_recursive(kvm_debugfs_dir); add the same at the err_vfio label, whose fall-through covers every path taken after kvm_init_debug(). Fixes: 2b0128127373 ("KVM: Register /dev/kvm as the _very_ last thing during initialization") Signed-off-by: leixiang Link: https://patch.msgid.link/20260706095910.39798-1-leixiang@kylinos.cn Signed-off-by: Sean Christopherson

KVM: Remove kvm_debugfs_dir on kvm_init() error paths

2026-07-08T20:41:15+00:00

KVM: Initialize a vCPU's index to '-1' while it's being created

2026-07-08T20:41:12+00:00

Invalidate a vCPU's index immediately after allocating storage for the vCPU so that KVM doesn't incorrectly treat a vCPU that is the process of being created as being vCPU0. This will also allow detecting that a vCPU is in the process of being created and thus otherwise unreachable, which is useful for avoiding false positives in lockdep assertions on vcpu->mutex. Unwind the index back to -1 if inserting the vCPU into the array or adding the vCPU to the fd table fails, so that kvm_arch_vcpu_destroy() sees the vCPU as unreachable, i.e. so that teardown logic doesn't hit false positive lockdep assertions. Opportunistically add a comment to call out that the "real" index needs to be set before making the vCPU visible to other tasks. Note, kvm_wait_for_vcpu_online() naturally does the right thing thanks to vcpu->vcpu_idx and kvm->online_vcpus being signed values. Reviewed-by: Philippe Mathieu-Daudé Link: https://patch.msgid.link/20260630225619.511632-8-seanjc@google.com Signed-off-by: Sean Christopherson

KVM: Move kvm_io_bus_get_dev() locking responsibilities to callers

2026-07-06T16:15:57+00:00

kvm_io_bus_get_dev() returns a device that is only matched by the address, and nothing else. This can cause a lifetime issue if the matched device is not the expected type, as by the time the caller can introspect the object, it might be gone (the srcu lock having been dropped). Given that there is only a single user of this helper, the simplest option is to move the locking responsibility to the caller, which can keep the srcu lock held for as long as it wants. Note that this aligns with other kvm_io_bus*() helpers, which already require the srcu lock to be held by the callers. Reported-by: Will Deacon Fixes: 8a39d00670f07 ("KVM: kvm_io_bus: Add kvm_io_bus_get_dev() call") Link: https://lore.kernel.org/all/20260626111344.802555-1-maz@kernel.org Cc: stable@vger.kernel.org Reviewed-by: Oliver Upton Link: https://patch.msgid.link/20260627105105.1005990-1-maz@kernel.org Signed-off-by: Marc Zyngier

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

2026-06-25T17:21:13+00:00

Pull kvm fixes from Paolo Bonzini: "s390: - Fix S390_USER_OPEREXEC so it can now be enabled regardless of other unrelated capabilities - Fix handling of the _PAGE_UNUSED pte bit that could lead to guest memory corruption in some scenarios - A bunch of misc gmap fixes (locking, behaviour under memory pressure) - Fix CMMA dirty tracking x86: - Tidy up some WARN_ON() and BUG_ON(), replacing them with WARN_ON_ONCE() or KVM_BUG_ON(). All of these have obviously never triggered, or somebody would have been annoyed earlier, but still... - Fix missing interrupt due to stale CR8 intercept - Add a statistic that can come in handy to debug leaks as well as the vulnerability to a class of recently-discovered issues - Do not ask arch/x86/kernel to export default_cpu_present_to_apicid() just for KVM" * tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (22 commits) x86/apic: KVM: Use cpu_physical_id() to get APIC ID of running vCPU for AVIC KVM: x86/mmu: Expose number of shadow MMU shadow pages as a stat KVM: x86: Unconditionally recompute CR8 intercept on PPR update KVM: VMX: Grab vmcs12 on CR8 interception update iff vCPU is in guest mode KVM: x86: WARN (once) if RTC pending EOI tracking goes off the rails KVM: x86: WARN and fail kvm_set_irq() if a PIC or I/O APIC vector is invalid KVM: x86: Bug the VM, not the kernel, if the ISR count {under,over}flows KVM: x86/mmu: Bug the VM, not the host kernel, if KVM write-protects upper SPTEs KVM: x86: Replace BUG_ON() with WARN_ON_ONCE() on "bad" nested GPA translation KVM: Replace guest-triggerable BUG_ON() in ioeventfd datamatch with get_unaligned() KVM: s390: Return failure in case of failure in kvm_s390_set_cmma_bits() KVM: s390: selftests: Fix cmma selftest KVM: s390: Fix cmma dirty tracking KVM: s390: Fix locking in kvm_s390_set_mem_control() KVM: s390: Fix handle_{sske,pfmf} under memory pressure KVM: s390: Fix code typo in gmap_protect_asce_top_level() KVM: s390: Do not set special large pages dirty KVM: s390: Fix dat_peek_cmma() overflow s390/mm: Fix handling of _PAGE_UNUSED pte bit KVM: s390: Fix typo in UCONTROL documentation ...

KVM: Replace guest-triggerable BUG_ON() in ioeventfd datamatch with get_unaligned()

2026-06-24T09:25:14+00:00

Drop a BUG_ON() that has been reachable since it was first added, way back in 2009, and instead use get_unaligned() to perform potentially-unaligned accesses. For a given store, KVM x86's emulator tracks the entire value in the destination operand, x86_emulate_ctxt.dst. If the destination is memory, and the target splits multiple pages and/or is emulated MMIO, then KVM handles each fragment independently. E.g. on a page split starting at page offset 0xffc, KVM writes 4 bytes to the first page, then the remaining bytes to the second page, using ctxt->dst as the source for both (with appropriate offsets). If the destination splits a page *and* hits emulated MMIO on the second page, then KVM will complete the write to the first page, then emulate the MMIO access to the second page. If there is a datamatch-enabled ioeventfd at offset 0 of the second page, then KVM will process the remainder of the store as a potential ioeventfd signal. Putting it all together, if the guest emits a store that splits a page starting at page offset N, and the second page has a datamatch-enabled ioeventfd at offset 0, then KVM will check for datamatch using &dst.valptr[N] as the source. Due to dst (and thus dst.valptr) being 32-byte aligned, if N is not aligned to @len, the BUG_ON() fires. E.g. with a 16-byte store at page offset 0xffc, to an ioeventfd of len 8, all initial checks in ioeventfd_in_range() will succeed, and the BUG_ON() fires due to @val being 4-byte aligned, but not 8-byte aligned. ------------[ cut here ]------------ kernel BUG at arch/x86/kvm/../../../virt/kvm/eventfd.c:783! Oops: invalid opcode: 0000 [#1] SMP CPU: 0 UID: 1000 PID: 615 Comm: repro Not tainted 7.1.0-rc2-ff238429d1ea #365 PREEMPT Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015 RIP: 0010:ioeventfd_write+0x6c/0x70 [kvm] Call Trace: __kvm_io_bus_write+0x85/0xb0 [kvm] kvm_io_bus_write+0x53/0x80 [kvm] vcpu_mmio_write+0x66/0xf0 [kvm] emulator_read_write_onepage+0x12a/0x540 [kvm] emulator_read_write+0x109/0x2b0 [kvm] x86_emulate_insn+0x4f8/0xfb0 [kvm] x86_emulate_instruction+0x181/0x790 [kvm] kvm_mmu_page_fault+0x313/0x630 [kvm] vmx_handle_exit+0x18a/0x590 [kvm_intel] kvm_arch_vcpu_ioctl_run+0xc81/0x1c90 [kvm] kvm_vcpu_ioctl+0x2d5/0x970 [kvm] __x64_sys_ioctl+0x8a/0xd0 do_syscall_64+0xb7/0x890 entry_SYSCALL_64_after_hwframe+0x4b/0x53 RIP: 0033:0x7f19c931a9bf Modules linked in: kvm_intel kvm irqbypass ---[ end trace 0000000000000000 ]--- In a perfect world, the fix would be to simply delete the BUG_ON(), as KVM x86 doesn't perform alignment checks on "normal" memory accesses at CPL0. Sadly, C99 ruins all the fun; while the x86 architecture plays nice, dereferencing an unaligned pointer directly is undefined behavior in C, e.g. triggers splats when running with CONFIG_UBSAN_ALIGNMENT=y. Fixes: d34e6b175e61 ("KVM: add ioeventfd support") Cc: stable@vger.kernel.org Signed-off-by: Sean Christopherson Message-ID: <20260612225241.678509-1-seanjc@google.com> Signed-off-by: Paolo Bonzini

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

2026-06-19T15:56:49+00:00

Pull kvm updates from Paolo Bonzini: "arm64: This is a bit of an odd merge window on the KVM/arm64 front. There is absolutely no new feature in the pull request. It is purely fixes, because it is simply becoming too hard to review new stuff when so many AI-fuelled fixes hit the list. - Significant cleanup of the vgic-v5 PPI support which was merged in 7.1. This makes the code more maintainable, and squashes a couple of bugs in the meantime - Set of fixes for the handling of the MMU in an NV context, particularly VNCR-triggered faults. S1POE support is fixed as well - Large set of pKVM fixes, mostly addressing recurring issues around hypervisor tracking of donated pages in obscure cases where the donation could fail and leave things in a bizarre state - Fixes for the so-called "lazy vgic init", which resulted in sleeping operations in non-preemptible sections. This turned out to be far more invasive than initially expected.. - Reduce the overhead of L1/L2 context switch by not touching the FP registers - Fix the way non-implemented page sizes are dealt with when a guest insist on using them for S2 translation - The usual set of low-impact fixes and cleanups all over the map Loongarch: - On a request for lazy FPU load, load all FPU state that the VM supports instead of enabling only the part (FPU, LSX or LASX) that caused the FPU load request - Some enhancements about interrupt injection - Some bug fixes and other small changes RISC-V: - Batch G-stage TLB flushes for GPA range based page table updates - Convert HGEI line management to fully per-HART - Fix missing CSR dirty marking when FWFT state updated via ONE_REG - Fix stale FWFT feature exposure to Guest/VM - Speed up dirty logging write faults using MMU rwlock and atomic PTE updates using cmpxchg() for permission-only changes - Use flexible array for APLIC IRQ state - Use kvm_slot_dirty_track_enabled() for logging enable check on a memslot - Avoid skipping valid pages in kvm_riscv_gstage_wp_range() - Avoid skipping valid pages in kvm_riscv_gstage_unmap_range() - Use endian-specific __lelong for NACL shared memory S390: - KVM_PRE_FAULT_MEMORY support - Support for 2G hugepages - Support for the ASTFLEIE 2 facility - Support for fast inject using kvm_arch_set_irq_inatomic - Fix potential leak of uninitialized bytes - A few more misc gmap fixes x86: - Generic support for the more granular permissions allowed by EPT, namely "read" (which was previously usurping the U bit) and separate execution bits for kernel and userspace - Do not assume that all page tables start with U=1/W=1/NX=0 at the root, as AMD GMET needs to have U=0 at the root - Introduce common assembly macros for use within Intel and AMD vendor-specific vmentry code. This touches the SPEC_CTRL handling, which is now entirely done in assembly for Intel (by reusing the AMD code that already existed), and register save/restore which uses some macro magic to compute the offsets in the struct. Both of these are preparatory changes for upcoming APX support - Clean up KVM's register tracking and storage, primarily to prepare for APX support, which expands the maximum number of GPRs from 16 to 32 - Keep a single copy of the PDPTRs rather than two, since architecturally there is just one - Handle EXIT_FASTPATH_EXIT_USERSPACE in vendor code to ensure vendor code gets a chance to handle things like reaping the PML buffer - Update KVM's view of PV async enabling if and only if the MSR write fully succeeds - Fix a variety of issues where the emulator doesn't honor guest-debug state, and clean up related code along the way - Synthesize EPT Violation and #NPF "error code" bits when injecting faults into L1 that didn't originate in hardware (in which case the VMCS/VMCB doesn't hold relevant information) - Add support for virtualizing (well, emulating) AMD's flavor of CPL>0 CPUID faulting - Clean up the GPR APIs so that KVM's use of "raw" is consistent, and fix a variety of minor bugs along the way - Fix an OOB memory access due to not checking the VP ID when handling a Hyper-V PV TLB flush for L2 - Fix a bug in the mediated PMU's handling of fixed counters that allowed the guest to bypass the PMU event filter - Allow userspace to return EAGAIN when handling SNP and TDX hypercalls, so the KVM can forward a "retry" status code to the guest, and reserve all unused error codes for future usage - Overhaul the TDP MMU => S-EPT code to move as much S-EPT specific logic as possible into the TDX code, and to funnel (almost) all S-EPT updates into a single chokepoint. The motivation is largely to prepare for upcoming Dynamic PAMT support, but the cleanups are nice to have on their own - Plug a hole in shadow page table handling, where KVM fails to recursively zap nested EPT/NPT shadow page tables when the nested hypervisor tears down its own EPT/NPT page tables from the bottom up x86 (Intel): - Support for nested MBEC (Mode-Based Execute Control), see above in the generic section; also run with MBEC enabled even for non-nested mode - Use the kernel's "enum pg_level" in the TDX APIs instead of the TDX-Module's level definitions (which are 0-based) - Rework the TDX memory APIs to not require/assume that guest memory is backed by "struct page" (in prepartion for guest_memfd hugepage support) - Fix a largely benign bug where KVM TDX would incorrectly state it could emulate several x2APIC MSRs - Use the "safe" WRMSR API when proxying LBR MSR writes as the to-be-written value is guest controlled and completely unvalidated x86 (AMD): - Support for nested GMET (Guest Mode Execution Trap), see above in the generic section; also run with GMET enabled even for non-nested mode - Fixes and minor cleanups to GHCB handling, on top of the earlier work already merged into 7.1-rc - Ensure KVM's copy of CR0 and CR3 are up-to-date prior to invoking fastpath handlers - Add support for virtualizing gPAT (KVM previously just used L1's PAT when running L2) - Fix goofs where KVM mishandles side effects (e.g. single-step and PMC updates) when emulating VMRUN - Fix a variety of bugs in AVIC's handling of x2APIC MSR interception, most notably where KVM didn't disable interception of IRR, ISR, and TMR regs - Add support for virtualizing Host-Only/Guest-Only bits in the mediated PMU - Don't advertise support for unusable VM types, and account for VM types that are disabled by firmware, e.g. to mitigate security vulnerabilities - Rewrite the SEV {en,de}crypt debug ioctls as they were riddle with bugs and unnecessarily complicated, and add comprehensive tests - Clean up and deduplicate the SEV page pinning code - Fix minor goofs related to writing back CPUID information after firmware rejects a CPUID page for an SNP vCPU Generic: - Rename invalidate_begin() to invalidate_start() throughout KVM to follow the kernel's nomenclature, e.g. for mmu_notifiers - Use guard() to cleanup up various KVM+VFIO flows - Minor cleanups guest_memfd: - Return -EEXIST instead of -EINVAL if userspace attempts to bind a gmem range to multiple memslots, and fix the test that was supposed to ensure KVM returns -EEXIST - Treat memslot binding offsets and sizes as unsigned values to fix a bug where KVM interprets a large "offset + size" as a negative value and allows a nonsensical offset - Use the inode number instead of the page offset for the NUMA interleaving index to fix a bug where the effective index would jump by two for consecutive pages (the caller also adds in the page offset) Selftests: - Randomize the dirty log test's delay when reaping the bitmap on the first pass, as always waiting only 1ms hid a KVM RISC-V bug as the test reaped the bitmap before KVM could build up enough state to hit the bug - A pile of one-off fixes and cleanups" * tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (326 commits) KVM: x86/mmu: Ensure hugepage is in by slot before checking max mapping level KVM: x86: Fix shadow paging use-after-free due to unexpected role KVM: s390: Introducing kvm_arch_set_irq_inatomic fast inject KVM: s390: Enable adapter_indicators_set to use mapped pages KVM: s390: Add map/unmap ioctl and clean mappings post-guest riscv: kvm: Use endian-specific __lelong for NACL shared memory KVM: selftests: access_tracking_perf_test: bump number of NUMA nodes to 32 KVM: s390: vsie: Implement ASTFLEIE facility 2 KVM: s390: vsie: Refactor handle_stfle s390/sclp: Detect ASTFLEIE 2 facility KVM: s390: Minor refactor of base/ext facility lists KVM: x86/mmu: move pdptrs out of the MMU KVM: x86: check that kvm_handle_invpcid is only invoked with shadow paging KVM: nSVM: invalidate cached PDPTRs across nested NPT transitions KVM: nVMX: remove unnecessary code in prepare_vmcs02_rare KVM: x86: remove nested_mmu from mmu_is_nested() KVM: arm64: vgic-its: Make ABI commit helpers return void KVM: s390: Initialize KVM_S390_GET_CMMA_BITS memory LoongArch: KVM: Add missing slots_lock for device register/unregister LoongArch: KVM: Validate irqchip index in irqfd routing ...