On Tue, Jan 24, 2023 at 11:49:02PM +0000, Sean Christopherson wrote:
> Move all potential to-be-saved PMU MSRs into a separate array so that a
> future patch can easily omit all PMU MSRs from the list when the PMU is
> disabled.
>
> No functional change intended.
>
> Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
> ---
> arch/x86/kvm/x86.c | 153 ++++++++++++++++++++++++---------------------
> 1 file changed, 82 insertions(+), 71 deletions(-)
>
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index d4a610ffe2b8..9b6e1af63531 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -1419,7 +1419,7 @@ EXPORT_SYMBOL_GPL(kvm_emulate_rdpmc);
> * may depend on host virtualization features rather than host cpu features.
> */
>
> -static const u32 msrs_to_save_all[] = {
> +static const u32 msrs_to_save_base[] = {
I guess the comments relating to msr_to_save_all should be updated as well. :)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 186cb6a81643..4bce96cd615e 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1413,7 +1413,7 @@ EXPORT_SYMBOL_GPL(kvm_emulate_rdpmc);
*
* The three MSR lists(msrs_to_save, emulated_msrs, msr_based_features)
* extract the supported MSRs from the related const lists.
- * msrs_to_save is selected from the msrs_to_save_all to reflect the
+ * msrs_to_save is selected from the msrs_to_save_base to reflect the
* capabilities of the host cpu. This capabilities test skips MSRs that are
* kvm-specific. Those are put in emulated_msrs_all; filtering of emulated_msrs
* may depend on host virtualization features rather than host cpu features.
@@ -1516,7 +1516,7 @@ static const u32 emulated_msrs_all[] = {
* by arch/x86/kvm/vmx/nested.c based on CPUID or other MSRs.
* We always support the "true" VMX control MSRs, even if the host
* processor does not, so I am putting these registers here rather
- * than in msrs_to_save_all.
+ * than in msrs_to_save_base.
*/
MSR_IA32_VMX_BASIC,
MSR_IA32_VMX_TRUE_PINBASED_CTLS,
For the comments of emulated_msrs_all, after renaming msrs_to_save_all to
msrs_to_save_base, maybe we do not need to take pains to explain that?
B.R.
Yu
