Re: [Xen-devel] [PATCH v12 for-xen-4.5 03/20] x86/VPMU: Set MSR bitmaps only for HVM/PVH guests

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Thu, Sep 25, 2014 at 03:28:39PM -0400, Boris Ostrovsky wrote:
> In preparation for making VPMU code shared with PV make sure that we we update
> MSR bitmaps only for HVM/PVH guests
> 
> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
> Acked-by: Kevin Tian <kevin.tian@xxxxxxxxx>

Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
> ---
>  xen/arch/x86/hvm/svm/vpmu.c       | 21 +++++++++++++--------
>  xen/arch/x86/hvm/vmx/vpmu_core2.c |  8 +++++---
>  2 files changed, 18 insertions(+), 11 deletions(-)
> 
> diff --git a/xen/arch/x86/hvm/svm/vpmu.c b/xen/arch/x86/hvm/svm/vpmu.c
> index 8e07a98..c7e0946 100644
> --- a/xen/arch/x86/hvm/svm/vpmu.c
> +++ b/xen/arch/x86/hvm/svm/vpmu.c
> @@ -244,7 +244,8 @@ static int amd_vpmu_save(struct vcpu *v)
>  
>      context_save(v);
>  
> -    if ( !vpmu_is_set(vpmu, VPMU_RUNNING) && ctx->msr_bitmap_set )
> +    if ( !vpmu_is_set(vpmu, VPMU_RUNNING) &&
> +         has_hvm_container_domain(v->domain) && ctx->msr_bitmap_set )
>          amd_vpmu_unset_msr_bitmap(v);
>  
>      return 1;
> @@ -287,8 +288,9 @@ static int amd_vpmu_do_wrmsr(unsigned int msr, uint64_t 
> msr_content,
>      ASSERT(!supported);
>  
>      /* For all counters, enable guest only mode for HVM guest */
> -    if ( (get_pmu_reg_type(msr) == MSR_TYPE_CTRL) &&
> -        !(is_guest_mode(msr_content)) )
> +    if ( has_hvm_container_domain(v->domain) &&
> +         (get_pmu_reg_type(msr) == MSR_TYPE_CTRL) &&
> +         !is_guest_mode(msr_content) )
>      {
>          set_guest_mode(msr_content);
>      }
> @@ -303,8 +305,9 @@ static int amd_vpmu_do_wrmsr(unsigned int msr, uint64_t 
> msr_content,
>          apic_write(APIC_LVTPC, PMU_APIC_VECTOR);
>          vpmu->hw_lapic_lvtpc = PMU_APIC_VECTOR;
>  
> -        if ( !((struct amd_vpmu_context *)vpmu->context)->msr_bitmap_set )
> -            amd_vpmu_set_msr_bitmap(v);
> +        if ( has_hvm_container_domain(v->domain) &&
> +             !((struct amd_vpmu_context *)vpmu->context)->msr_bitmap_set )
> +             amd_vpmu_set_msr_bitmap(v);
>      }
>  
>      /* stop saving & restore if guest stops first counter */
> @@ -314,8 +317,9 @@ static int amd_vpmu_do_wrmsr(unsigned int msr, uint64_t 
> msr_content,
>          apic_write(APIC_LVTPC, PMU_APIC_VECTOR | APIC_LVT_MASKED);
>          vpmu->hw_lapic_lvtpc = PMU_APIC_VECTOR | APIC_LVT_MASKED;
>          vpmu_reset(vpmu, VPMU_RUNNING);
> -        if ( ((struct amd_vpmu_context *)vpmu->context)->msr_bitmap_set )
> -            amd_vpmu_unset_msr_bitmap(v);
> +        if ( has_hvm_container_domain(v->domain) &&
> +             ((struct amd_vpmu_context *)vpmu->context)->msr_bitmap_set )
> +             amd_vpmu_unset_msr_bitmap(v);
>          release_pmu_ownship(PMU_OWNER_HVM);
>      }
>  
> @@ -406,7 +410,8 @@ static void amd_vpmu_destroy(struct vcpu *v)
>      if ( !vpmu_is_set(vpmu, VPMU_CONTEXT_ALLOCATED) )
>          return;
>  
> -    if ( ((struct amd_vpmu_context *)vpmu->context)->msr_bitmap_set )
> +    if ( has_hvm_container_domain(v->domain) &&
> +         ((struct amd_vpmu_context *)vpmu->context)->msr_bitmap_set )
>          amd_vpmu_unset_msr_bitmap(v);
>  
>      xfree(vpmu->context);
> diff --git a/xen/arch/x86/hvm/vmx/vpmu_core2.c 
> b/xen/arch/x86/hvm/vmx/vpmu_core2.c
> index 68b6272..c9f6ae4 100644
> --- a/xen/arch/x86/hvm/vmx/vpmu_core2.c
> +++ b/xen/arch/x86/hvm/vmx/vpmu_core2.c
> @@ -335,7 +335,8 @@ static int core2_vpmu_save(struct vcpu *v)
>      __core2_vpmu_save(v);
>  
>      /* Unset PMU MSR bitmap to trap lazy load. */
> -    if ( !vpmu_is_set(vpmu, VPMU_RUNNING) && cpu_has_vmx_msr_bitmap )
> +    if ( !vpmu_is_set(vpmu, VPMU_RUNNING) &&
> +         has_hvm_container_domain(v->domain) && cpu_has_vmx_msr_bitmap )
>          core2_vpmu_unset_msr_bitmap(v->arch.hvm_vmx.msr_bitmap);
>  
>      return 1;
> @@ -448,7 +449,8 @@ static int core2_vpmu_msr_common_check(u32 msr_index, int 
> *type, int *index)
>      {
>          __core2_vpmu_load(current);
>          vpmu_set(vpmu, VPMU_CONTEXT_LOADED);
> -        if ( cpu_has_vmx_msr_bitmap )
> +        if ( has_hvm_container_domain(current->domain) &&
> +             cpu_has_vmx_msr_bitmap )
>              core2_vpmu_set_msr_bitmap(current->arch.hvm_vmx.msr_bitmap);
>      }
>      return 1;
> @@ -822,7 +824,7 @@ static void core2_vpmu_destroy(struct vcpu *v)
>          return;
>      xfree(core2_vpmu_cxt->pmu_enable);
>      xfree(vpmu->context);
> -    if ( cpu_has_vmx_msr_bitmap )
> +    if ( has_hvm_container_domain(v->domain) && cpu_has_vmx_msr_bitmap )
>          core2_vpmu_unset_msr_bitmap(v->arch.hvm_vmx.msr_bitmap);
>      release_pmu_ownship(PMU_OWNER_HVM);
>      vpmu_reset(vpmu, VPMU_CONTEXT_ALLOCATED);
> -- 
> 1.8.1.4
> 
> 
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