Linus, The following changes since commit 1b237f190eb3d36f52dffe07a40b5eb210280e00: Linux 6.17-rc3 (2025-08-24 12:04:12 -0400) are available in the Git repository at: https://git.kernel.org/pub/scm/virt/kvm/kvm.git tags/for-linus for you to fetch changes up to 42a0305ab114975dbad3fe9efea06976dd62d381: Merge tag 'kvmarm-fixes-6.17-1' of https://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into HEAD (2025-08-29 12:57:31 -0400) It's a whole bunch of stuff that has accumulated since the merge window. Mostly due to ARM changes involving sysreg context switching, it's quite on the larger side; there is a lot of unrelated fixed, but here is an excerpt of the commit message from the biggest issue: Volodymyr reports (again!) that under some circumstances (E2H==0, walking S1 PTs), PAR_EL1 doesn't report the value of the latest walk in the CPU register, but that instead the value is written to the backing store. Further investigation indicates that the root cause of this is that a group of registers (PAR_EL1, TPIDR*_EL{0,1}, the *32_EL2 dregs) should always be considered as "on CPU", as they are not remapped between EL1 and EL2. We fail to treat them accordingly, and end-up considering that the register (PAR_EL1 in this example) should be written to memory instead of in the register. Also, probably I won't be sending another until rc6 or rc7 unless there's something egregious. But with KVM Forum happening next week, I expect that things will stay relatively calm. Thanks, Paolo ---------------------------------------------------------------- ARM: - Correctly handle 'invariant' system registers for protected VMs - Improved handling of VNCR data aborts, including external aborts - Fixes for handling of FEAT_RAS for NV guests, providing a sane fault context during SEA injection and preventing the use of RASv1p1 fault injection hardware - Ensure that page table destruction when a VM is destroyed gives an opportunity to reschedule - Large fix to KVM's infrastructure for managing guest context loaded on the CPU, addressing issues where the output of AT emulation doesn't get reflected to the guest - Fix AT S12 emulation to actually perform stage-2 translation when necessary - Avoid attempting vLPI irqbypass when GICv4 has been explicitly disabled for a VM - Minor KVM + selftest fixes RISC-V: - Fix pte settings within kvm_riscv_gstage_ioremap() - Fix comments in kvm_riscv_check_vcpu_requests() - Fix stack overrun when setting vlenb via ONE_REG x86: - Use array_index_nospec() to sanitize the target vCPU ID when handling PV IPIs and yields as the ID is guest-controlled. - Drop a superfluous cpumask_empty() check when reclaiming SEV memory, as the common case, by far, is that at least one CPU will have entered the VM, and wbnoinvd_on_cpus_mask() will naturally handle the rare case where the set of have_run_cpus is empty. Selftests (not KVM): - Rename the is_signed_type() macro in kselftest_harness.h to is_signed_var() to fix a collision with linux/overflow.h. The collision generates compiler warnings due to the two macros having different meaning. ---------------------------------------------------------------- Arnd Bergmann (1): kvm: arm64: use BUG() instead of BUG_ON(1) Fangyu Yu (1): RISC-V: KVM: Fix pte settings within kvm_riscv_gstage_ioremap() Fuad Tabba (3): KVM: arm64: Handle AIDR_EL1 and REVIDR_EL1 in host for protected VMs KVM: arm64: Sync protected guest VBAR_EL1 on injecting an undef exception arm64: vgic-v2: Fix guest endianness check in hVHE mode Marc Zyngier (14): KVM: arm64: nv: Properly check ESR_EL2.VNCR on taking a VNCR_EL2 related fault KVM: arm64: selftest: Add standalone test checking for KVM's own UUID KVM: arm64: Correctly populate FAR_EL2 on nested SEA injection arm64: Add capability denoting FEAT_RASv1p1 KVM: arm64: Handle RASv1p1 registers KVM: arm64: Ignore HCR_EL2.FIEN set by L1 guest's EL2 KVM: arm64: Make ID_AA64PFR0_EL1.RAS writable KVM: arm64: Make ID_AA64PFR1_EL1.RAS_frac writable KVM: arm64: Get rid of ARM64_FEATURE_MASK() KVM: arm64: Check for SYSREGS_ON_CPU before accessing the 32bit state KVM: arm64: Simplify sysreg access on exception delivery KVM: arm64: Fix vcpu_{read,write}_sys_reg() accessors KVM: arm64: Remove __vcpu_{read,write}_sys_reg_{from,to}_cpu() KVM: arm64: nv: Fix ATS12 handling of single-stage translation Mark Brown (1): KVM: arm64: selftests: Sync ID_AA64MMFR3_EL1 in set_id_regs Oliver Upton (1): KVM: arm64: nv: Handle SEAs due to VNCR redirection Paolo Bonzini (3): Merge tag 'kvm-x86-fixes-6.17-rc7' of https://github.com/kvm-x86/linux into HEAD Merge tag 'kvm-riscv-fixes-6.17-1' of https://github.com/kvm-riscv/linux into HEAD Merge tag 'kvmarm-fixes-6.17-1' of https://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into HEAD Quan Zhou (1): RISC-V: KVM: Correct kvm_riscv_check_vcpu_requests() comment Radim Krčmář (1): RISC-V: KVM: fix stack overrun when loading vlenb Raghavendra Rao Ananta (3): KVM: arm64: Don't attempt vLPI mappings when vPE allocation is disabled KVM: arm64: Split kvm_pgtable_stage2_destroy() KVM: arm64: Reschedule as needed when destroying the stage-2 page-tables Sean Christopherson (1): selftests: harness: Rename is_signed_type() to avoid collision with overflow.h Thijs Raymakers (1): KVM: x86: use array_index_nospec with indices that come from guest Yury Norov (1): KVM: SEV: don't check have_run_cpus in sev_writeback_caches() arch/arm64/include/asm/kvm_host.h | 111 +----- arch/arm64/include/asm/kvm_mmu.h | 1 + arch/arm64/include/asm/kvm_pgtable.h | 30 ++ arch/arm64/include/asm/kvm_pkvm.h | 4 +- arch/arm64/include/asm/kvm_ras.h | 25 -- arch/arm64/include/asm/sysreg.h | 3 - arch/arm64/kernel/cpufeature.c | 24 ++ arch/arm64/kvm/arm.c | 8 +- arch/arm64/kvm/at.c | 6 +- arch/arm64/kvm/emulate-nested.c | 2 +- arch/arm64/kvm/hyp/exception.c | 20 +- arch/arm64/kvm/hyp/nvhe/list_debug.c | 2 +- arch/arm64/kvm/hyp/nvhe/sys_regs.c | 5 + arch/arm64/kvm/hyp/pgtable.c | 25 +- arch/arm64/kvm/hyp/vgic-v2-cpuif-proxy.c | 2 +- arch/arm64/kvm/hyp/vhe/switch.c | 5 +- arch/arm64/kvm/mmu.c | 65 +++- arch/arm64/kvm/nested.c | 5 +- arch/arm64/kvm/pkvm.c | 11 +- arch/arm64/kvm/sys_regs.c | 431 ++++++++++++++------- arch/arm64/kvm/vgic/vgic-mmio-v3.c | 8 + arch/arm64/kvm/vgic/vgic-mmio.c | 2 +- arch/arm64/kvm/vgic/vgic.h | 10 +- arch/arm64/tools/cpucaps | 1 + arch/riscv/kvm/mmu.c | 5 +- arch/riscv/kvm/vcpu.c | 2 +- arch/riscv/kvm/vcpu_vector.c | 2 + arch/x86/kvm/lapic.c | 2 + arch/x86/kvm/svm/sev.c | 10 +- arch/x86/kvm/x86.c | 7 +- tools/arch/arm64/include/asm/sysreg.h | 3 - tools/testing/selftests/kselftest_harness.h | 4 +- tools/testing/selftests/kvm/Makefile.kvm | 1 + .../testing/selftests/kvm/arm64/aarch32_id_regs.c | 2 +- .../testing/selftests/kvm/arm64/debug-exceptions.c | 12 +- tools/testing/selftests/kvm/arm64/kvm-uuid.c | 70 ++++ tools/testing/selftests/kvm/arm64/no-vgic-v3.c | 4 +- .../testing/selftests/kvm/arm64/page_fault_test.c | 6 +- tools/testing/selftests/kvm/arm64/set_id_regs.c | 9 +- .../selftests/kvm/arm64/vpmu_counter_access.c | 2 +- tools/testing/selftests/kvm/lib/arm64/processor.c | 6 +- 41 files changed, 585 insertions(+), 368 deletions(-) delete mode 100644 arch/arm64/include/asm/kvm_ras.h create mode 100644 tools/testing/selftests/kvm/arm64/kvm-uuid.c
