Re: [Qemu-devel] [PATCH] target-i386: Intel xsaves

[Paolo Bonzini <pbonzini@redhat.com>]

On 02/12/2014 13:19, Wanpeng Li wrote:
> Add xsaves related definition, it also add corresponding part to 
> kvm_get/put, and vmstate.
> 
> Signed-off-by: Wanpeng Li <wanpeng.li@linux.intel.com>
> ---
>  target-i386/cpu.h     |  2 ++
>  target-i386/kvm.c     | 15 +++++++++++++++
>  target-i386/machine.c |  3 ++-
>  3 files changed, 19 insertions(+), 1 deletion(-)
> 
> diff --git a/target-i386/cpu.h b/target-i386/cpu.h
> index 015f5b5..cff7433 100644
> --- a/target-i386/cpu.h
> +++ b/target-i386/cpu.h
> @@ -389,6 +389,7 @@
>  #define MSR_VM_HSAVE_PA                 0xc0010117
>  
>  #define MSR_IA32_BNDCFGS                0x00000d90
> +#define MSR_IA32_XSS                    0x00000da0
>  
>  #define XSTATE_FP                       (1ULL << 0)
>  #define XSTATE_SSE                      (1ULL << 1)
> @@ -1019,6 +1020,7 @@ typedef struct CPUX86State {
>      uint64_t xstate_bv;
>  
>      uint64_t xcr0;
> +    uint64_t xss;
>  
>      TPRAccess tpr_access_type;
>  } CPUX86State;
> diff --git a/target-i386/kvm.c b/target-i386/kvm.c
> index ccf36e8..c6fc417 100644
> --- a/target-i386/kvm.c
> +++ b/target-i386/kvm.c
> @@ -80,6 +80,7 @@ static bool has_msr_hv_hypercall;
>  static bool has_msr_hv_vapic;
>  static bool has_msr_hv_tsc;
>  static bool has_msr_mtrr;
> +static bool has_msr_xss;
>  
>  static bool has_msr_architectural_pmu;
>  static uint32_t num_architectural_pmu_counters;
> @@ -826,6 +827,10 @@ static int kvm_get_supported_msrs(KVMState *s)
>                      has_msr_bndcfgs = true;
>                      continue;
>                  }
> +                if (kvm_msr_list->indices[i] == MSR_IA32_XSS) {
> +                    has_msr_xss = true;
> +                    continue;
> +                }
>              }
>          }
>  
> @@ -1224,6 +1229,9 @@ static int kvm_put_msrs(X86CPU *cpu, int level)
>      if (has_msr_bndcfgs) {
>          kvm_msr_entry_set(&msrs[n++], MSR_IA32_BNDCFGS, env->msr_bndcfgs);
>      }
> +    if (has_msr_xss) {
> +        kvm_msr_entry_set(&msrs[n++], MSR_IA32_XSS, env->xss);
> +    }
>  #ifdef TARGET_X86_64
>      if (lm_capable_kernel) {
>          kvm_msr_entry_set(&msrs[n++], MSR_CSTAR, env->cstar);
> @@ -1570,6 +1578,10 @@ static int kvm_get_msrs(X86CPU *cpu)
>      if (has_msr_bndcfgs) {
>          msrs[n++].index = MSR_IA32_BNDCFGS;
>      }
> +    if (has_msr_xss) {
> +        msrs[n++].index = MSR_IA32_XSS;
> +    }
> +
>  
>      if (!env->tsc_valid) {
>          msrs[n++].index = MSR_IA32_TSC;
> @@ -1717,6 +1729,9 @@ static int kvm_get_msrs(X86CPU *cpu)
>          case MSR_IA32_BNDCFGS:
>              env->msr_bndcfgs = msrs[i].data;
>              break;
> +        case MSR_IA32_XSS:
> +            env->xss = msrs[i].data;
> +            break;
>          default:
>              if (msrs[i].index >= MSR_MC0_CTL &&
>                  msrs[i].index < MSR_MC0_CTL + (env->mcg_cap & 0xff) * 4) {
> diff --git a/target-i386/machine.c b/target-i386/machine.c
> index 1c13b14..43af33f 100644
> --- a/target-i386/machine.c
> +++ b/target-i386/machine.c
> @@ -689,7 +689,7 @@ static const VMStateDescription vmstate_avx512 = {
>  
>  VMStateDescription vmstate_x86_cpu = {
>      .name = "cpu",
> -    .version_id = 12,
> +    .version_id = 13,
>      .minimum_version_id = 3,
>      .pre_save = cpu_pre_save,
>      .post_load = cpu_post_load,
> @@ -786,6 +786,7 @@ VMStateDescription vmstate_x86_cpu = {
>          VMSTATE_UINT64_V(env.xcr0, X86CPU, 12),
>          VMSTATE_UINT64_V(env.xstate_bv, X86CPU, 12),
>          VMSTATE_YMMH_REGS_VARS(env.ymmh_regs, X86CPU, CPU_NB_REGS, 12),
> +        VMSTATE_UINT64_V(env.xss, X86CPU, 13),
>          VMSTATE_END_OF_LIST()
>          /* The above list is not sorted /wrt version numbers, watch out! */
>      },
> 

Please use a subsection instead of bumping the version number.
Otherwise looks good.

Thanks!

Paolo