kernel/linux.git/Documentation/virt/kvm, branch v7.2-rc1

Merge tag 'kvm-s390-next-7.2-2' of https://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into HEAD

2026-06-24T11:41:41+00:00

* 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

KVM: s390: Fix typo in UCONTROL documentation

2026-06-24T08:01:57+00:00

Small typo noticed while writing the USER_OPEREXEC selftest. Signed-off-by: Eric Farman Reviewed-by: Hendrik Brueckner Reviewed-by: Claudio Imbrenda Message-ID: <20260507200836.3500368-4-farman@linux.ibm.com> Signed-off-by: Claudio Imbrenda

Merge tag 'kvm-s390-next-7.2-1' of https://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into HEAD

2026-06-15T13:36:43+00:00

KVM: s390: New features for 7.2 New features for 7.2 for KVM/s390: * KVM_PRE_FAULT_MEMORY support * Support for 2G hugepages * Support for the ASTFLEIE 2 facility * kvm_arch_set_irq_inatomic Fast Inject * Fix potential leak of uninitialized bytes

Merge tag 'kvmarm-7.2' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into HEAD

2026-06-12T08:51:42+00:00

KVM/arm64 updates for 7.2 * New features: - None. Zilch. Nada. Que dalle. * Fixes and other improvements: - 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.

Merge tag 'kvm-x86-svm-7.2' of https://github.com/kvm-x86/linux into HEAD

2026-06-12T08:16:59+00:00

KVM SVM changes for 7.2 - 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.

Merge tag 'kvm-x86-misc-7.2' of https://github.com/kvm-x86/linux into HEAD

2026-06-12T08:11:09+00:00

KVM misc x86 changes for 7.2 - Handle EXIT_FASTPATH_EXIT_USERSPACE in vendor code to ensure vendor code gets a chance to handle things like reaping the PML buffer. - Ensure KVM's copy of CR0 and CR3 are up-to-date on SVM prior to invoking fastpath handlers. - 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. - Misc fixes and cleanups.

Merge branch kvm-arm64/vgic-v5-PPI-fixes into kvmarm-master/next

2026-06-12T08:08:31+00:00

* kvm-arm64/vgic-v5-PPI-fixes: : . : Substantial cleanup of the vgic-v5 PPI support. From the original : cover letter: : : "With the GICv5 PPi support merged in, it has become obvious that a few : things could be improved, both from the correctness and maintainability : angles." : . KVM: arm64: Fix arch timer interrupts for GICv3-on-GICv5 guests irqchip/gic-v5: Immediately exec priority drop following activate Documentation: KVM: Clarify that PMU_V3_IRQ IntID requirements for GICv5 Documentation: KVM: Fix typos in VGICv5 documentation KVM: arm64: selftests: Improve error handling for GICv5 PPI selftest KVM: arm64: selftests: Cleanup unused vars in GICv5 PPI selftest KVM: arm64: selftests: Add missing GIC CDEN to no-vgic-v5 selftest KVM: arm64: vgic-v5: Atomically assign bits to PPI DVI bitmap KVM: arm64: vgic-v5: Add missing trap handing for NV triage KVM: arm64: vgic-v5: Limit support to 64 PPIs KVM: arm64: vgic: Rationalise per-CPU irq accessor KVM: arm64: vgic-v5: Drop defensive checks from vgic_v5_ppi_queue_irq_unlock() KVM: arm64: vgic: Consolidate vgic_allocate_private_irqs_locked() KVM: arm64: vgic: Constify struct irq_ops usage KVM: arm64: vgic-v5: Drop pointless ARM64_HAS_GICV5_CPUIF check KVM: arm64: vgic-v5: Remove use of __assign_bit() with a constant KVM: arm64: vgic-v5: Move PPI caps into kvm_vgic_global_state KVM: arm64: vgic-v5: Add for_each_visible_v5_ppi() iterator Signed-off-by: Marc Zyngier

KVM: s390: Document the KVM_CAP_S390_HPAGE_2G capability

2026-06-09T15:30:57+00:00

Document the KVM_CAP_S390_HPAGE_2G capability, which behaves very similarly to the existing KVM_CAP_S390_HPAGE_1M. Signed-off-by: Claudio Imbrenda Message-ID: <20260609150930.665370-5-imbrenda@linux.ibm.com>

Documentation: KVM: Synchronize x86 VM types

2026-06-08T16:20:19+00:00

KVM has reflected KVM_X86_SNP_VM to userspace since 1dfe571c12cf ("KVM: SEV: Add initial SEV-SNP support"), and KVM_X86_TDX_VM since 161d34609f9b ("KVM: TDX: Make TDX VM type supported"). Update the documentation to reflect this fact. Fixes: 1dfe571c12cf ("KVM: SEV: Add initial SEV-SNP support") Fixes: 161d34609f9b ("KVM: TDX: Make TDX VM type supported") Signed-off-by: Carlos López Reviewed-by: Binbin Wu Link: https://patch.msgid.link/20260603114504.814647-2-clopez@suse.de [sean: use one tab instead of two] Signed-off-by: Sean Christopherson

Merge branch 'kvm-ghcb-for-7.2' into HEAD

2026-06-03T15:00:06+00:00

Merge the final part of the GHCB 7.2 fixes at https://lore.kernel.org/kvm/20260529183549.1104619-1-pbonzini@redhat.com/. Patches 1-17 have already been included in Linux 7.1; these are minor cleanups, and fixes for behaviors that are suboptimal or contradicting the specification. Signed-off-by: Paolo Bonzini