On Fri, May 22, 2020 at 11:32:49AM -0500, Babu Moger wrote: > [Backported upstream commit 37486135d3a7b03acc7755b63627a130437f066a] > > Though rdpkru and wrpkru are contingent upon CR4.PKE, the PKRU > resource isn't. It can be read with XSAVE and written with XRSTOR. > So, if we don't set the guest PKRU value here(kvm_load_guest_xsave_state), > the guest can read the host value. > > In case of kvm_load_host_xsave_state, guest with CR4.PKE clear could > potentially use XRSTOR to change the host PKRU value. > > While at it, move pkru state save/restore to common code and the > host_pkru field to kvm_vcpu_arch. This will let SVM support protection keys. > > Cc: stable@xxxxxxxxxxxxxxx > Reported-by: Jim Mattson <jmattson@xxxxxxxxxx> > Signed-off-by: Babu Moger <babu.moger@xxxxxxx> > Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx> Now applied, thanks. greg k-h
