linux-kernel - Re: [PATCH 1/5] KVM: nVMX: Fix VMX controls MSRs setup when nested VMX enabled

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Date:   Tue, 1 Sep 2020 11:27:29 +0800
From:   Xiaoyao Li <xiaoyao.li@...el.com>
To:     Chenyi Qiang <chenyi.qiang@...el.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/5] KVM: nVMX: Fix VMX controls MSRs setup when nested
 VMX enabled

On 8/28/2020 4:56 PM, Chenyi Qiang wrote:
> KVM supports the nested VM_{EXIT, ENTRY}_LOAD_IA32_PERF_GLOBAL_CTRL and
> VM_{ENTRY_LOAD, EXIT_CLEAR}_BNDCFGS, but they doesn't expose during
> the setup of nested VMX controls MSR.
> 
> Signed-off-by: Chenyi Qiang <chenyi.qiang@...el.com>

Reviewed-by: Xiaoyao Li <xiaoyao.li@...el.com>

> ---
>   arch/x86/kvm/vmx/nested.c | 6 ++++--
>   1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
> index 23b58c28a1c9..6e0e71f4d45f 100644
> --- a/arch/x86/kvm/vmx/nested.c
> +++ b/arch/x86/kvm/vmx/nested.c
> @@ -6310,7 +6310,8 @@ void nested_vmx_setup_ctls_msrs(struct nested_vmx_msrs *msrs, u32 ept_caps)
>   #ifdef CONFIG_X86_64
>   		VM_EXIT_HOST_ADDR_SPACE_SIZE |
>   #endif
> -		VM_EXIT_LOAD_IA32_PAT | VM_EXIT_SAVE_IA32_PAT;
> +		VM_EXIT_LOAD_IA32_PAT | VM_EXIT_SAVE_IA32_PAT |
> +		VM_EXIT_CLEAR_BNDCFGS | VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL;
>   	msrs->exit_ctls_high |=
>   		VM_EXIT_ALWAYSON_WITHOUT_TRUE_MSR |
>   		VM_EXIT_LOAD_IA32_EFER | VM_EXIT_SAVE_IA32_EFER |
> @@ -6329,7 +6330,8 @@ void nested_vmx_setup_ctls_msrs(struct nested_vmx_msrs *msrs, u32 ept_caps)
>   #ifdef CONFIG_X86_64
>   		VM_ENTRY_IA32E_MODE |
>   #endif
> -		VM_ENTRY_LOAD_IA32_PAT;
> +		VM_ENTRY_LOAD_IA32_PAT | VM_ENTRY_LOAD_BNDCFGS |
> +		VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL;
>   	msrs->entry_ctls_high |=
>   		(VM_ENTRY_ALWAYSON_WITHOUT_TRUE_MSR | VM_ENTRY_LOAD_IA32_EFER);
>   
>