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Message-ID: <fb05e1cf-e847-11cf-c01e-fc07202229ad@redhat.com>
Date:   Mon, 18 Oct 2021 14:41:09 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Xiaoyao Li <xiaoyao.li@...el.com>
Cc:     Sean Christopherson <seanjc@...gle.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,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/7] KVM: VMX: Rename pt_desc.addr_range to
 pt_desc.nr_addr_range

On 27/08/21 09:02, Xiaoyao Li wrote:
> To better self explain the meaning of this field.
> 
> Suggested-by: Sean Christopherson <seanjc@...gle.com>
> Signed-off-by: Xiaoyao Li <xiaoyao.li@...el.com>

Let's use num_addr_ranges to map the PT_CAP constant.

Paolo

>   arch/x86/kvm/vmx/vmx.c | 26 +++++++++++++-------------
>   arch/x86/kvm/vmx/vmx.h |  2 +-
>   2 files changed, 14 insertions(+), 14 deletions(-)
> 
> diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
> index 96a2df65678f..c54b99cec0e6 100644
> --- a/arch/x86/kvm/vmx/vmx.c
> +++ b/arch/x86/kvm/vmx/vmx.c
> @@ -1059,8 +1059,8 @@ static void pt_guest_enter(struct vcpu_vmx *vmx)
>   	rdmsrl(MSR_IA32_RTIT_CTL, vmx->pt_desc.host.ctl);
>   	if (vmx->pt_desc.guest.ctl & RTIT_CTL_TRACEEN) {
>   		wrmsrl(MSR_IA32_RTIT_CTL, 0);
> -		pt_save_msr(&vmx->pt_desc.host, vmx->pt_desc.addr_range);
> -		pt_load_msr(&vmx->pt_desc.guest, vmx->pt_desc.addr_range);
> +		pt_save_msr(&vmx->pt_desc.host, vmx->pt_desc.nr_addr_ranges);
> +		pt_load_msr(&vmx->pt_desc.guest, vmx->pt_desc.nr_addr_ranges);
>   	}
>   }
>   
> @@ -1070,8 +1070,8 @@ static void pt_guest_exit(struct vcpu_vmx *vmx)
>   		return;
>   
>   	if (vmx->pt_desc.guest.ctl & RTIT_CTL_TRACEEN) {
> -		pt_save_msr(&vmx->pt_desc.guest, vmx->pt_desc.addr_range);
> -		pt_load_msr(&vmx->pt_desc.host, vmx->pt_desc.addr_range);
> +		pt_save_msr(&vmx->pt_desc.guest, vmx->pt_desc.nr_addr_ranges);
> +		pt_load_msr(&vmx->pt_desc.host, vmx->pt_desc.nr_addr_ranges);
>   	}
>   
>   	/*
> @@ -1460,16 +1460,16 @@ static int vmx_rtit_ctl_check(struct kvm_vcpu *vcpu, u64 data)
>   	 * cause a #GP fault.
>   	 */
>   	value = (data & RTIT_CTL_ADDR0) >> RTIT_CTL_ADDR0_OFFSET;
> -	if ((value && (vmx->pt_desc.addr_range < 1)) || (value > 2))
> +	if ((value && (vmx->pt_desc.nr_addr_ranges < 1)) || (value > 2))
>   		return 1;
>   	value = (data & RTIT_CTL_ADDR1) >> RTIT_CTL_ADDR1_OFFSET;
> -	if ((value && (vmx->pt_desc.addr_range < 2)) || (value > 2))
> +	if ((value && (vmx->pt_desc.nr_addr_ranges < 2)) || (value > 2))
>   		return 1;
>   	value = (data & RTIT_CTL_ADDR2) >> RTIT_CTL_ADDR2_OFFSET;
> -	if ((value && (vmx->pt_desc.addr_range < 3)) || (value > 2))
> +	if ((value && (vmx->pt_desc.nr_addr_ranges < 3)) || (value > 2))
>   		return 1;
>   	value = (data & RTIT_CTL_ADDR3) >> RTIT_CTL_ADDR3_OFFSET;
> -	if ((value && (vmx->pt_desc.addr_range < 4)) || (value > 2))
> +	if ((value && (vmx->pt_desc.nr_addr_ranges < 4)) || (value > 2))
>   		return 1;
>   
>   	return 0;
> @@ -1889,7 +1889,7 @@ static int vmx_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
>   	case MSR_IA32_RTIT_ADDR0_A ... MSR_IA32_RTIT_ADDR3_B:
>   		index = msr_info->index - MSR_IA32_RTIT_ADDR0_A;
>   		if (!vmx_pt_mode_is_host_guest() ||
> -		    (index >= 2 * vmx->pt_desc.addr_range))
> +		    (index >= 2 * vmx->pt_desc.nr_addr_ranges))
>   			return 1;
>   		if (index % 2)
>   			msr_info->data = vmx->pt_desc.guest.addr_b[index / 2];
> @@ -2204,7 +2204,7 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
>   		if (!pt_can_write_msr(vmx))
>   			return 1;
>   		index = msr_info->index - MSR_IA32_RTIT_ADDR0_A;
> -		if (index >= 2 * vmx->pt_desc.addr_range)
> +		if (index >= 2 * vmx->pt_desc.nr_addr_ranges)
>   			return 1;
>   		if (is_noncanonical_address(data, vcpu))
>   			return 1;
> @@ -3880,7 +3880,7 @@ void pt_update_intercept_for_msr(struct kvm_vcpu *vcpu)
>   	vmx_set_intercept_for_msr(vcpu, MSR_IA32_RTIT_OUTPUT_BASE, MSR_TYPE_RW, flag);
>   	vmx_set_intercept_for_msr(vcpu, MSR_IA32_RTIT_OUTPUT_MASK, MSR_TYPE_RW, flag);
>   	vmx_set_intercept_for_msr(vcpu, MSR_IA32_RTIT_CR3_MATCH, MSR_TYPE_RW, flag);
> -	for (i = 0; i < vmx->pt_desc.addr_range; i++) {
> +	for (i = 0; i < vmx->pt_desc.nr_addr_ranges; i++) {
>   		vmx_set_intercept_for_msr(vcpu, MSR_IA32_RTIT_ADDR0_A + i * 2, MSR_TYPE_RW, flag);
>   		vmx_set_intercept_for_msr(vcpu, MSR_IA32_RTIT_ADDR0_B + i * 2, MSR_TYPE_RW, flag);
>   	}
> @@ -7113,7 +7113,7 @@ static void update_intel_pt_cfg(struct kvm_vcpu *vcpu)
>   	}
>   
>   	/* Get the number of configurable Address Ranges for filtering */
> -	vmx->pt_desc.addr_range = intel_pt_validate_cap(vmx->pt_desc.caps,
> +	vmx->pt_desc.nr_addr_ranges = intel_pt_validate_cap(vmx->pt_desc.caps,
>   						PT_CAP_num_address_ranges);
>   
>   	/* Initialize and clear the no dependency bits */
> @@ -7161,7 +7161,7 @@ static void update_intel_pt_cfg(struct kvm_vcpu *vcpu)
>   		vmx->pt_desc.ctl_bitmask &= ~RTIT_CTL_FABRIC_EN;
>   
>   	/* unmask address range configure area */
> -	for (i = 0; i < vmx->pt_desc.addr_range; i++)
> +	for (i = 0; i < vmx->pt_desc.nr_addr_ranges; i++)
>   		vmx->pt_desc.ctl_bitmask &= ~(0xfULL << (32 + i * 4));
>   }
>   
> diff --git a/arch/x86/kvm/vmx/vmx.h b/arch/x86/kvm/vmx/vmx.h
> index 4858c5fd95f2..f48eafbbed0e 100644
> --- a/arch/x86/kvm/vmx/vmx.h
> +++ b/arch/x86/kvm/vmx/vmx.h
> @@ -62,7 +62,7 @@ struct pt_ctx {
>   
>   struct pt_desc {
>   	u64 ctl_bitmask;
> -	u32 addr_range;
> +	u32 nr_addr_ranges;
>   	u32 caps[PT_CPUID_REGS_NUM * PT_CPUID_LEAVES];
>   	struct pt_ctx host;
>   	struct pt_ctx guest;
> 


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