2018-02-27 06:57+0000, Tianyu Lan: > From: Lan Tianyu <Tianyu.Lan@xxxxxxxxxxxxx> > > This patch is to check sreg value first and then load vcpu in order > to avoid redundant loading/putting vcpu. > > Signed-off-by: Lan Tianyu <Tianyu.Lan@xxxxxxxxxxxxx> > --- Patch "KVM: x86: KVM_CAP_SYNC_REGS" made significant changes to the sregs setter, so the patch cannot be applied in current form. I think that moving the X86_CR4_OSXSAVE check to guest_cpuid_has still makes sense, but avoiding the vcpu_load/put would produce worse code elsewhere and avoiding the load/put is not critical as any error is probably going to be the end for this VM. Thanks.
