linux-kernel - Re: [PATCH v7 4/8] KVM: VMX: dump_vmcs() reports tertiary_exec

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Message-ID: <YkYvSHcIrhRgU93l@google.com>
Date:   Thu, 31 Mar 2022 22:46:32 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Zeng Guang <guang.zeng@...el.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Tony Luck <tony.luck@...el.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Kim Phillips <kim.phillips@....com>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        Jethro Beekman <jethro@...tanix.com>,
        Kai Huang <kai.huang@...el.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, Robert Hu <robert.hu@...el.com>,
        Gao Chao <chao.gao@...el.com>,
        Robert Hoo <robert.hu@...ux.intel.com>
Subject: Re: [PATCH v7 4/8] KVM: VMX: dump_vmcs() reports
 tertiary_exec_control field as well

Nit, shortlog is funky, it'd read better as

  KVM: VMX: Report tertiary_exec_control field in dump_vmcs()

On Fri, Mar 04, 2022, Zeng Guang wrote:
> From: Robert Hoo <robert.hu@...ux.intel.com>
> 
> Add tertiary_exec_control field report in dump_vmcs()

Please call out the shuffling of PinBased and provide a sample dump.  It's not
mandatory to put that sort of info in the changelog, but it really does help
reviewers, e.g. I remember discussing the shuffling and seeing the sample output,
but other reviewers coming into this blind won't have that luxury.

> Reviewed-by: Maxim Levitsky <mlevitsk@...hat.com>
> Signed-off-by: Robert Hoo <robert.hu@...ux.intel.com>
> Signed-off-by: Zeng Guang <guang.zeng@...el.com>
> ---
>  arch/x86/kvm/vmx/vmx.c | 17 +++++++++++++----
>  1 file changed, 13 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
> index 8a5713d49635..7beba7a9f247 100644
> --- a/arch/x86/kvm/vmx/vmx.c
> +++ b/arch/x86/kvm/vmx/vmx.c
> @@ -5891,6 +5891,7 @@ void dump_vmcs(struct kvm_vcpu *vcpu)
>  	struct vcpu_vmx *vmx = to_vmx(vcpu);
>  	u32 vmentry_ctl, vmexit_ctl;
>  	u32 cpu_based_exec_ctrl, pin_based_exec_ctrl, secondary_exec_control;
> +	u64 tertiary_exec_control;
>  	unsigned long cr4;
>  	int efer_slot;
>  
> @@ -5904,9 +5905,16 @@ void dump_vmcs(struct kvm_vcpu *vcpu)
>  	cpu_based_exec_ctrl = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
>  	pin_based_exec_ctrl = vmcs_read32(PIN_BASED_VM_EXEC_CONTROL);
>  	cr4 = vmcs_readl(GUEST_CR4);
> -	secondary_exec_control = 0;
> +
>  	if (cpu_has_secondary_exec_ctrls())
>  		secondary_exec_control = vmcs_read32(SECONDARY_VM_EXEC_CONTROL);
> +	else
> +		secondary_exec_control = 0;
> +
> +	if (cpu_has_tertiary_exec_ctrls())
> +		tertiary_exec_control = vmcs_read64(TERTIARY_VM_EXEC_CONTROL);
> +	else
> +		tertiary_exec_control = 0;
>  
>  	pr_err("VMCS %p, last attempted VM-entry on CPU %d\n",
>  	       vmx->loaded_vmcs->vmcs, vcpu->arch.last_vmentry_cpu);
> @@ -6006,9 +6014,10 @@ void dump_vmcs(struct kvm_vcpu *vcpu)
>  		vmx_dump_msrs("host autoload", &vmx->msr_autoload.host);
>  
>  	pr_err("*** Control State ***\n");
> -	pr_err("PinBased=%08x CPUBased=%08x SecondaryExec=%08x\n",
> -	       pin_based_exec_ctrl, cpu_based_exec_ctrl, secondary_exec_control);
> -	pr_err("EntryControls=%08x ExitControls=%08x\n", vmentry_ctl, vmexit_ctl);
> +	pr_err("CPUBased=0x%08x SecondaryExec=0x%08x TertiaryExec=0x%016llx\n",
> +	       cpu_based_exec_ctrl, secondary_exec_control, tertiary_exec_control);
> +	pr_err("PinBased=0x%08x EntryControls=%08x ExitControls=%08x\n",
> +	       pin_based_exec_ctrl, vmentry_ctl, vmexit_ctl);
>  	pr_err("ExceptionBitmap=%08x PFECmask=%08x PFECmatch=%08x\n",
>  	       vmcs_read32(EXCEPTION_BITMAP),
>  	       vmcs_read32(PAGE_FAULT_ERROR_CODE_MASK),
> -- 
> 2.27.0
>