linux-kernel - Re: [PATCH v7 08/13] KVM: x86: Add Intel processor trace context for each vcpu

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Date:   Thu, 3 May 2018 14:39:09 +0300
From:   Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To:     Luwei Kang <luwei.kang@...el.com>
Cc:     kvm@...r.kernel.org, tglx@...utronix.de, mingo@...hat.com,
        hpa@...or.com, x86@...nel.org, pbonzini@...hat.com,
        rkrcmar@...hat.com, linux-kernel@...r.kernel.org, joro@...tes.org,
        peterz@...radead.org, chao.p.peng@...ux.intel.com
Subject: Re: [PATCH v7 08/13] KVM: x86: Add Intel processor trace context for
 each vcpu

On Thu, May 03, 2018 at 08:08:38PM +0800, Luwei Kang wrote:
> From: Chao Peng <chao.p.peng@...ux.intel.com>
> 
> Add a data structure to save Intel Processor Trace context.
> It mainly include the value of Intel PT host/guest MSRs
> and guest CPUID information.

I'd say that code and data should be in the same patch.

> Signed-off-by: Chao Peng <chao.p.peng@...ux.intel.com>
> Signed-off-by: Luwei Kang <luwei.kang@...el.com>
> ---
>  arch/x86/kvm/vmx.c | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
> 
> diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
> index 27cf417..9a5c26d 100644
> --- a/arch/x86/kvm/vmx.c
> +++ b/arch/x86/kvm/vmx.c
> @@ -597,6 +597,23 @@ static inline int pi_test_sn(struct pi_desc *pi_desc)
>  			(unsigned long *)&pi_desc->control);
>  }
>  
> +struct pt_ctx {
> +	u64 ctl;
> +	u64 status;
> +	u64 output_base;
> +	u64 output_mask;
> +	u64 cr3_match;
> +	u64 addrs[MSR_IA32_RTIT_ADDR_COUNT];
> +};
> +
> +struct pt_desc {
> +	u64 ctl_bitmask;
> +	u32 range_cnt;
> +	u32 caps[PT_CPUID_REGS_NUM * PT_CPUID_LEAVES];
> +	struct pt_ctx host;
> +	struct pt_ctx guest;
> +};
> +
>  struct vcpu_vmx {
>  	struct kvm_vcpu       vcpu;
>  	unsigned long         host_rsp;
> @@ -693,6 +710,8 @@ struct vcpu_vmx {
>  	 */
>  	u64 msr_ia32_feature_control;
>  	u64 msr_ia32_feature_control_valid_bits;
> +
> +	struct pt_desc pt_desc;
>  };
>  
>  enum segment_cache_field {
> -- 
> 1.8.3.1
>