Re: [Xen-devel] [PATCH v2 1/2] x86/mm: Add information about faulted page's presence to npfec structure

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 17.12.15 at 21:22, <boris.ostrovsky@xxxxxxxxxx> wrote:
> This is provided explicitly in SVM and implicitly in VMX (when neither of
> the three EPT_EFFECTIVE_* bits is set).
> 
> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>

Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>

Retaining full context since you failed to Cc the VMX maintainers,
which I've no done.

Jan

> ---
>  xen/arch/x86/hvm/svm/svm.c |    3 ++-
>  xen/arch/x86/hvm/vmx/vmx.c |    5 ++++-
>  xen/include/xen/mm.h       |    1 +
>  3 files changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/xen/arch/x86/hvm/svm/svm.c b/xen/arch/x86/hvm/svm/svm.c
> index 0078100..a66d854 100644
> --- a/xen/arch/x86/hvm/svm/svm.c
> +++ b/xen/arch/x86/hvm/svm/svm.c
> @@ -1491,7 +1491,8 @@ static void svm_do_nested_pgfault(struct vcpu *v,
>      struct npfec npfec = {
>          .read_access = !(pfec & PFEC_insn_fetch),
>          .write_access = !!(pfec & PFEC_write_access),
> -        .insn_fetch = !!(pfec & PFEC_insn_fetch)
> +        .insn_fetch = !!(pfec & PFEC_insn_fetch),
> +        .present = !!(pfec & PFEC_page_present),
>      };
>  
>      /* These bits are mutually exclusive */
> diff --git a/xen/arch/x86/hvm/vmx/vmx.c b/xen/arch/x86/hvm/vmx/vmx.c
> index 2922673..7ea1882 100644
> --- a/xen/arch/x86/hvm/vmx/vmx.c
> +++ b/xen/arch/x86/hvm/vmx/vmx.c
> @@ -2746,7 +2746,10 @@ static void ept_handle_violation(unsigned long 
> qualification, paddr_t gpa)
>          .read_access = !!(qualification & EPT_READ_VIOLATION) ||
>                         !!(qualification & EPT_WRITE_VIOLATION),
>          .write_access = !!(qualification & EPT_WRITE_VIOLATION),
> -        .insn_fetch = !!(qualification & EPT_EXEC_VIOLATION)
> +        .insn_fetch = !!(qualification & EPT_EXEC_VIOLATION),
> +        .present = !!(qualification & (EPT_EFFECTIVE_READ |
> +                                       EPT_EFFECTIVE_WRITE |
> +                                       EPT_EFFECTIVE_EXEC))
>      };
>  
>      if ( tb_init_done )
> diff --git a/xen/include/xen/mm.h b/xen/include/xen/mm.h
> index 5d4b64b..a795dd6 100644
> --- a/xen/include/xen/mm.h
> +++ b/xen/include/xen/mm.h
> @@ -159,6 +159,7 @@ struct npfec {
>      unsigned int read_access:1;
>      unsigned int write_access:1;
>      unsigned int insn_fetch:1;
> +    unsigned int present:1;
>      unsigned int gla_valid:1;
>      unsigned int kind:2;  /* npfec_kind_t */
>  };
> -- 
> 1.7.1




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