[lkml]   [2021]   [Dec]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRE: [PATCH v3 22/22] kvm: x86: Disable interception for IA32_XFD on demand
> From: Sean Christopherson <>
> Sent: Wednesday, December 29, 2021 9:05 AM
> > + if (vcpu->arch.xfd_out_of_sync)
> Rather than adding a flag that tracks whether or not the MSR can be written
> by
> the guest, can't this be:
> if (!vmx_test_msr_bitmap_write(vcpu->loaded_vmcs->msr_bitmap))
> fpu_sync_guest_vmexit_xfd_state();

and forgot to mention a change different from above. It's in x86
common exit path but above is vmx specific check. I'm not sure
whether it's worthy of introducing another kvm_x86_ops callback
just for this minor usage.

Introducing an extra flag (e.g. vcpu->arch.xfd_disable_interception)
sounds simpler here.


 \ /
  Last update: 2021-12-29 08:38    [W:0.174 / U:0.152 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site