[5.15,0/2] KVM: x86: Fix for dirty logging emulated atomics

Message

Sean Christopherson April 4, 2024, 11:40 p.m. UTC

Two KVM x86 backports for 5.15.  Patch 2 is the primary motivation (fix
for potential guest data corruption after live migration).

Patch 1 is a (very) soft dependency to resolve a conflict.  It's not strictly
necessary (manually resolving the conflict wouldn't be difficult), but it
is a fix that has been in upstream for a long time.  The only reason I didn't
tag it for stable from the get-go is that the bug it fixes is very
theoretical.  At this point, the odds of the patch causing problems are
lower than the odds of me botching a manual backport.

Sean Christopherson (2):
  KVM: x86: Bail to userspace if emulation of atomic user access faults
  KVM: x86: Mark target gfn of emulated atomic instruction as dirty

 arch/x86/kvm/x86.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)


base-commit: 9465fef4ae351749f7068da8c78af4ca27e61928

Comments

Greg Kroah-Hartman April 5, 2024, 9:35 a.m. UTC | #1

On Thu, Apr 04, 2024 at 04:40:02PM -0700, Sean Christopherson wrote:
> Two KVM x86 backports for 5.15.  Patch 2 is the primary motivation (fix
> for potential guest data corruption after live migration).
> 
> Patch 1 is a (very) soft dependency to resolve a conflict.  It's not strictly
> necessary (manually resolving the conflict wouldn't be difficult), but it
> is a fix that has been in upstream for a long time.  The only reason I didn't
> tag it for stable from the get-go is that the bug it fixes is very
> theoretical.  At this point, the odds of the patch causing problems are
> lower than the odds of me botching a manual backport.
> 
> Sean Christopherson (2):
>   KVM: x86: Bail to userspace if emulation of atomic user access faults
>   KVM: x86: Mark target gfn of emulated atomic instruction as dirty
> 
>  arch/x86/kvm/x86.c | 12 +++++++++++-
>  1 file changed, 11 insertions(+), 1 deletion(-)
> 
> 
> base-commit: 9465fef4ae351749f7068da8c78af4ca27e61928
> -- 
> 2.44.0.478.gd926399ef9-goog

All now queued up, thanks.

greg k-h