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SubjectRe: [PATCH v2 20/28] KVM: VMX: Add missing VMENTRY controls to vmcs_config
On Wed, Jun 29, 2022 at 8:07 AM Vitaly Kuznetsov <vkuznets@redhat.com> wrote:
>
> As a preparation to reusing the result of setup_vmcs_config() in
> nested VMX MSR setup, add the VMENTRY controls which KVM doesn't
> use but supports for nVMX to KVM_OPT_VMX_VM_ENTRY_CONTROLS and
> filter them out in vmx_vmentry_ctrl().
>
> No functional change intended.
>
> Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
> ---
> arch/x86/kvm/vmx/vmx.c | 3 +++
> arch/x86/kvm/vmx/vmx.h | 4 +++-
> 2 files changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
> index e5ab77ed37e4..b774b6391e0e 100644
> --- a/arch/x86/kvm/vmx/vmx.c
> +++ b/arch/x86/kvm/vmx/vmx.c
> @@ -4179,6 +4179,9 @@ static u32 vmx_vmentry_ctrl(void)
> {
> u32 vmentry_ctrl = vmcs_config.vmentry_ctrl;
>
> + /* Not used by KVM but supported for nesting. */
> + vmentry_ctrl &= ~(VM_ENTRY_SMM | VM_ENTRY_DEACT_DUAL_MONITOR);
> +

LOL! KVM does not emulate the dual-monitor treatment of SMIs and SMM.
Do we actually claim to support these VM-entry controls today?!?

> if (vmx_pt_mode_is_system())
> vmentry_ctrl &= ~(VM_ENTRY_PT_CONCEAL_PIP |
> VM_ENTRY_LOAD_IA32_RTIT_CTL);
> diff --git a/arch/x86/kvm/vmx/vmx.h b/arch/x86/kvm/vmx/vmx.h
> index d4503a38735b..7ada8410a037 100644
> --- a/arch/x86/kvm/vmx/vmx.h
> +++ b/arch/x86/kvm/vmx/vmx.h
> @@ -479,7 +479,9 @@ static inline u8 vmx_get_rvi(void)
> __KVM_REQ_VMX_VM_ENTRY_CONTROLS
> #endif
> #define KVM_OPT_VMX_VM_ENTRY_CONTROLS \
> - (VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL | \
> + (VM_ENTRY_SMM | \
> + VM_ENTRY_DEACT_DUAL_MONITOR | \
> + VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL | \
> VM_ENTRY_LOAD_IA32_PAT | \
> VM_ENTRY_LOAD_IA32_EFER | \
> VM_ENTRY_LOAD_BNDCFGS | \
> --
> 2.35.3
>

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