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KVM x86 misc changes for 6.8:

Browse source 
- 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.
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Merge tag 'kvm-x86-misc-6.8' of https://github.com/kvm-x86/linux into HEAD

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.
This commit is contained in:
Paolo Bonzini 2024-01-08 08:10:04 -05:00
commit 33d0403fda
6 changed files with 70 additions and 41 deletions
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