Messages in this thread | | | From | Jim Mattson <> | Date | Wed, 31 Jan 2018 13:05:40 -0800 | Subject | Re: [PATCH v5 4/5] KVM: VMX: Allow direct access to MSR_IA32_SPEC_CTRL |
| |
On Wed, Jan 31, 2018 at 1:00 PM, Paolo Bonzini <pbonzini@redhat.com> wrote:
> Yes, but how would moving the field into struct loaded_vmcs do anything? > Only vmon/vmoff would change anything in vmx->nested.vmcs02.
My suggestion was that nested_vmx_merge_msr_bitmap should set the vmcs02 version of save_spec_ctrl_on_exit based on the calculated value of the write permission bit for IA32_SPEC_CTRL in the vmcs02 MSR permission bitmap.
> Even then, L1 vmexits will also be penalized because L1 has probably > done an RDMSR/WRMSR on L2->L1 vmexit. So I don't think it's an issue?
Yes, it sucks to be L1 in this situation.
| |