Re: [Xen-devel] [V0 PATCH] pvh: expose feature flags from tools for domUs

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

On 25/01/14 02:13, Mukesh Rathor wrote:
> Expose features for pvh domUs from tools.
> 
> Signed-off-by: Mukesh Rathor <mukesh.rathor@xxxxxxxxxx>
> ---
>  tools/libxc/xc_cpuid_x86.c |   26 ++++++++++++++++----------
>  tools/libxc/xc_domain.c    |    1 +
>  tools/libxc/xenctrl.h      |    2 +-
>  3 files changed, 18 insertions(+), 11 deletions(-)
> 
> diff --git a/tools/libxc/xc_cpuid_x86.c b/tools/libxc/xc_cpuid_x86.c
> index bbbf9b8..33f6829 100644
> --- a/tools/libxc/xc_cpuid_x86.c
> +++ b/tools/libxc/xc_cpuid_x86.c
> @@ -433,7 +433,7 @@ static void xc_cpuid_hvm_policy(
>  
>  static void xc_cpuid_pv_policy(
>      xc_interface *xch, domid_t domid,
> -    const unsigned int *input, unsigned int *regs)
> +    const unsigned int *input, unsigned int *regs, int is_pvh)
>  {
>      DECLARE_DOMCTL;
>      unsigned int guest_width;
> @@ -455,13 +455,16 @@ static void xc_cpuid_pv_policy(
>  
>      if ( (input[0] & 0x7fffffff) == 0x00000001 )
>      {
> -        clear_bit(X86_FEATURE_VME, regs[3]);
> -        clear_bit(X86_FEATURE_PSE, regs[3]);
> -        clear_bit(X86_FEATURE_PGE, regs[3]);
> -        clear_bit(X86_FEATURE_MCE, regs[3]);
> -        clear_bit(X86_FEATURE_MCA, regs[3]);
> +        if ( !is_pvh )
> +        {
> +            clear_bit(X86_FEATURE_VME, regs[3]);
> +            clear_bit(X86_FEATURE_PSE, regs[3]);
> +            clear_bit(X86_FEATURE_PGE, regs[3]);
> +            clear_bit(X86_FEATURE_MCE, regs[3]);
> +            clear_bit(X86_FEATURE_MCA, regs[3]);

Should we enable MCA/MCE flags for PVH DomUs? It looks to me like Dom0
is the only domain that can make use of MCE/MCA.

Roger.


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