[GIT PULL] KVM/arm64 fixes for 7.1, take #4

[Paolo Bonzini]

On Fri, May 29, 2026 at 12:54 PM Marc Zyngier <maz at kernel.org> wrote:
>
> Paolo,
>
> This is hopefully the last round of fixes for 7.1 on the KVM/arm64
> front.
>
> We have yet another batch of fixes for the newly introduced tracing
> code (memory leaks), a fix for a config symbol misspelled in the
> source code (therefore being permanently disabled), a fix for an
> embarrassing bug in the PMU emulation (write any value as long as it
> is zero), and an SVE sanitisation bug in nested virt resulting in a
> guest being able to access more than it really should.
>
> I've purposely refrained from adding another lot of fixes for more
> benign issues since His Majesty has announced he'd be picky about
> that. Fear not, they'll be in the 7.2 pull request.

I'm afraid I'll already have enough reasons to be shouted at this
week. :)  Pulled, thanks.

Paolo

> Please pull,
>
>         M.
>
> The following changes since commit 1702da76e017ae0fbe1a92b07bc332972c293e89:
>
>   KVM: arm64: Fix nVHE/pKVM hyp tracing error on invalid desc (2026-05-20 08:08:37 +0100)
>
> are available in the Git repository at:
>
>   git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm.git tags/kvmarm-fixes-7.1-4
>
> for you to fetch changes up to 83726330748981372bde86ed5411d7b306612991:
>
>   KVM: arm64: Correctly cap ZCR_EL2 provided by a guest hypervisor (2026-05-29 10:04:00 +0100)
>
> ----------------------------------------------------------------
> KVM/arm64 fixes for 7.1, take #4
>
> - Restore CONFIG_PKVM_DISABLE_STAGE2_ON_PANIC to its former glory by
>   making sure the config symbol is correctly spelled out in the code
>
> - Don't reset the AArch32 view of the PMU counters to zero when the
>   guest is writing to them
>
> - Fix an assorted collection of memory leaks in the newly added tracing
>   code
>
> - Fix the capping of ZCR_EL2 which could be used in an unsanitised way
>   by an L2 guest
>
> ----------------------------------------------------------------
> Mark Brown (1):
>       KVM: arm64: Correctly cap ZCR_EL2 provided by a guest hypervisor
>
> Qiang Ma (1):
>       KVM: arm64: PMU: Preserve AArch32 counter low bits
>
> Vincent Donnefort (4):
>       KVM: arm64: Fix CONFIG_PKVM_DISABLE_STAGE2_ON_PANIC
>       KVM: arm64: Fix meta-page unsharing in pKVM hyp tracing
>       KVM: arm64: Fix rollback in hyp_trace_buffer_share_hyp()
>       KVM: arm64: Fix memory leak in hyp_trace_unload()
>
>  arch/arm64/include/asm/kvm_host.h       |  2 +-
>  arch/arm64/kvm/hyp/include/hyp/switch.h | 16 ++++++++++------
>  arch/arm64/kvm/hyp/nvhe/host.S          |  2 +-
>  arch/arm64/kvm/hyp_trace.c              |  9 ++++++---
>  arch/arm64/kvm/nested.c                 |  5 +++++
>  arch/arm64/kvm/pmu-emul.c               |  4 ++--
>  arch/arm64/kvm/sys_regs.c               | 11 +++--------
>  7 files changed, 28 insertions(+), 21 deletions(-)
>