On Tue, Jul 19, 2022 at 6:55 PM Sean Christopherson <seanjc@xxxxxxxxxx> wrote: > > On Tue, Jul 19, 2022, Paolo Bonzini wrote: > > On 7/14/22 18:13, Aaron Lewis wrote: > > > --- > > > > > > Posting as an RFC to get feedback whether it's too late to protect the > > > unused flag bits. My hope is this feature is still new enough, and not > > > widely used enough, and this change is reasonable enough to be able to be > > > corrected. These bits should have been protected from the start, but > > > unfortunately they were not. > > > > > > Another option would be to correct this by adding a quirk, but fixing > > > it that has its down sides. It complicates the code more than it > > > would otherwise be, and complicates the usage for anyone using any new > > > features introduce in the future because they would also have to enable > > > a quirk. For long term simplicity my hope is to be able to just patch > > > the original change. > > > > Yes, let's do it this way. > > Heh, which way is "this way"? > > (a) Fix KVM_CAP_X86_USER_SPACE_MSR and cross our fingers > (b) Add a quirk > (c) ??? I hope we're talking about (a). I should have a patchset out later today with fixes and selftest.
