Re: [PATCH v2] KVM: VMX: add MSR_IA32_TSX_CTRL into msrs_to_save
From: Jim Mattson
Date: Mon May 08 2023 - 13:29:17 EST
On Sun, May 7, 2023 at 6:54 PM Xiaoyao Li <xiaoyao.li@xxxxxxxxx> wrote:
> On 5/5/2023 2:18 AM, Mingwei Zhang wrote:
> > Add MSR_IA32_TSX_CTRL into msrs_to_save to explicitly tell userspace to
> > save/restore the register value during migration. Missing this may cause
> > userspace that relies on KVM ioctl(KVM_GET_MSR_INDEX_LIST) fail to port the
> > value to the target VM.
> > In addition, there is no need to add MSR_IA32_TSX_CTRL when
> > ARCH_CAP_TSX_CTRL_MSR is not supported in guest. So add the checking in
> > kvm_probe_msr_to_save().
> > Fixes: b07a5c53d42a ("KVM: vmx: use MSR_IA32_TSX_CTRL to hard-disable TSX on guest that lack it")
> I wonder it's the fix for this commit.
> Apart from this,
> Reviewed-by: Xiaoyao Li <xiaoyao.li@xxxxxxxxx>
Fixes: ea732b38b341 ("KVM: vmx: implement MSR_IA32_TSX_CTRL disable
Reviewed-by: Jim Mattson <jmattson@xxxxxxxxxx>