linux-kernel - Re: [GIT PULL] KVM: x86: Misc changes for 6.8

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Message-ID: <CABgObfbGtN5AZrqNAhwT7qawuNZA9UW_CoHDULzT191b=eb78Q@mail.gmail.com>
Date: Mon, 8 Jan 2024 13:58:12 +0100
From: Paolo Bonzini <pbonzini@...hat.com>
To: Sean Christopherson <seanjc@...gle.com>
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [GIT PULL] KVM: x86: Misc changes for 6.8

On Thu, Jan 4, 2024 at 8:33 PM Sean Christopherson <seanjc@...gle.com> wrote:
>
> A variety of one-off changes...
>
> The following changes since commit e9e60c82fe391d04db55a91c733df4a017c28b2f:
>
>   selftests/kvm: fix compilation on non-x86_64 platforms (2023-11-21 11:58:25 -0500)
>
> are available in the Git repository at:
>
>   https://github.com/kvm-x86/linux.git tags/kvm-x86-misc-6.8
>
> for you to fetch changes up to 15223c4f973a6120665ece9ce1ad17aec0be0e6c:
>
>   KVM: SVM,VMX: Use %rip-relative addressing to access kvm_rebooting (2023-11-30 12:51:54 -0800)
>
> ----------------------------------------------------------------
> KVM x86 misc changes for 6.8:
>
>  - Turn off KVM_WERROR by default for all configs so that it's not
>    inadvertantly enabled by non-KVM developers, which can be problematic for
>    subsystems that require no regressions for W=1 builds.
>
>  - Advertise all of the host-supported CPUID bits that enumerate IA32_SPEC_CTRL
>    "features".
>
>  - Don't force a masterclock update when a vCPU synchronizes to the current TSC
>    generation, as updating the masterclock can cause kvmclock's time to "jump"
>    unexpectedly, e.g. when userspace hotplugs a pre-created vCPU.
>
>  - Use RIP-relative address to read kvm_rebooting in the VM-Enter fault paths,
>    partly as a super minor optimization, but mostly to make KVM play nice with
>    position independent executable builds.
>
> ----------------------------------------------------------------

Pulled, thanks.

Paolo

> Jim Mattson (2):
>       KVM: x86: Advertise CPUID.(EAX=7,ECX=2):EDX[5:0] to userspace
>       KVM: x86: Use a switch statement and macros in __feature_translate()
>
> Sean Christopherson (2):
>       KVM: x86: Turn off KVM_WERROR by default for all configs
>       KVM: x86: Don't unnecessarily force masterclock update on vCPU hotplug
>
> Uros Bizjak (1):
>       KVM: SVM,VMX: Use %rip-relative addressing to access kvm_rebooting
>
>  arch/x86/kvm/Kconfig         | 14 +++++++-------
>  arch/x86/kvm/cpuid.c         | 21 ++++++++++++++++++---
>  arch/x86/kvm/reverse_cpuid.h | 33 ++++++++++++++++++++++-----------
>  arch/x86/kvm/svm/vmenter.S   | 10 +++++-----
>  arch/x86/kvm/vmx/vmenter.S   |  2 +-
>  arch/x86/kvm/x86.c           | 29 ++++++++++++++++-------------
>  6 files changed, 69 insertions(+), 40 deletions(-)
>