Re: [GIT PULL] KVM: x86 and selftests fixes for 6.12-rcN

[Paolo Bonzini]

On Wed, Nov 6, 2024 at 5:12 PM Sean Christopherson <seanjc@xxxxxxxxxx> wrote:
>
> Please pull several fixes for 6.12, and to save us both effort, please also
> apply several fixes that should probably go into 6.12 (the selftest fix
> definitely needs to land in 6.12).
>
>   https://lore.kernel.org/all/20241106034031.503291-1-jsperbeck@xxxxxxxxxx
>   https://lore.kernel.org/all/20241105010558.1266699-2-dionnaglaze@xxxxxxxxxx
>   https://lore.kernel.org/all/20241106015135.2462147-1-seanjc@xxxxxxxxxx

Done.

> And while I have your attention, I'd also like your input on a proposed "fix"
> for Intel PT virtualization, which is probably belongs in 6.12 too, if you
> agree with the direction.
>
>   https://lore.kernel.org/all/20241101185031.1799556-2-seanjc@xxxxxxxxxx

Yep, pulled it as well.

Paolo

> Note, this is based on v6.12-rc5 in order to pull in the necessary base for
> the -march=x86-64-v2 fix.
>
> The following changes since commit 81983758430957d9a5cb3333fe324fd70cf63e7e:
>
>   Linux 6.12-rc5 (2024-10-27 12:52:02 -1000)
>
> are available in the Git repository at:
>
>   https://github.com/kvm-x86/linux.git tags/kvm-x86-fixes-6.12-rcN
>
> for you to fetch changes up to e5d253c60e9627a22940e00a05a6115d722f07ed:
>
>   KVM: SVM: Propagate error from snp_guest_req_init() to userspace (2024-11-04 22:03:04 -0800)
>
> ----------------------------------------------------------------
> KVM x86 and selftests fixes for 6.12:
>
>  - Increase the timeout for the memslot performance selftest to avoid false
>    failures on arm64 and nested x86 platforms.
>
>  - Fix a goof in the guest_memfd selftest where a for-loop initialized a
>    bit mask to zero instead of BIT(0).
>
>  - Disable strict aliasing when building KVM selftests to prevent the
>    compiler from treating things like "u64 *" to "uint64_t *" cases as
>    undefined behavior, which can lead to nasty, hard to debug failures.
>
>  - Force -march=x86-64-v2 for KVM x86 selftests if and only if the uarch
>    is supported by the compiler.
>
>  - When emulating a guest TLB flush for a nested guest, flush vpid01, not
>    vpid02, if L2 is active but VPID is disabled in vmcs12, i.e. if L2 and
>    L1 are sharing VPID '0' (from L1's perspective).
>
>  - Fix a bug in the SNP initialization flow where KVM would return '0' to
>    userspace instead of -errno on failure.
>
> ----------------------------------------------------------------
> Maxim Levitsky (1):
>       KVM: selftests: memslot_perf_test: increase guest sync timeout
>
> Patrick Roy (1):
>       KVM: selftests: fix unintentional noop test in guest_memfd_test.c
>
> Sean Christopherson (4):
>       KVM: selftests: Disable strict aliasing
>       KVM: selftests: Don't force -march=x86-64-v2 if it's unsupported
>       KVM: nVMX: Treat vpid01 as current if L2 is active, but with VPID disabled
>       KVM: SVM: Propagate error from snp_guest_req_init() to userspace
>
>  arch/x86/kvm/svm/sev.c                          |  7 ++++--
>  arch/x86/kvm/vmx/nested.c                       | 30 ++++++++++++++++++++-----
>  arch/x86/kvm/vmx/vmx.c                          |  2 +-
>  tools/testing/selftests/kvm/Makefile            | 10 +++++----
>  tools/testing/selftests/kvm/guest_memfd_test.c  |  2 +-
>  tools/testing/selftests/kvm/memslot_perf_test.c |  2 +-
>  6 files changed, 39 insertions(+), 14 deletions(-)
>