Re: [Xen-devel] [PATCH for-4.7 2/4] x86/hvm: Raise #SS faults for %ss-based segmentation violations

[Wei Liu <wei.liu2@xxxxxxxxxx>]

CC George as well

On Mon, May 09, 2016 at 02:15:40PM +0100, Andrew Cooper wrote:
> Raising #GP under such circumstances is architecturally wrong.
> 
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> ---
> CC: Jan Beulich <JBeulich@xxxxxxxx>
> CC: Tim Deegan <tim@xxxxxxx>
> CC: Paul Durrant <paul.durrant@xxxxxxxxxx>
> CC: Wei Liu <wei.liu2@xxxxxxxxxx>
> ---
>  xen/arch/x86/hvm/emulate.c      | 3 ++-
>  xen/arch/x86/mm/shadow/common.c | 3 ++-
>  2 files changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/xen/arch/x86/hvm/emulate.c b/xen/arch/x86/hvm/emulate.c
> index be1e7c2..ee5cf1f 100644
> --- a/xen/arch/x86/hvm/emulate.c
> +++ b/xen/arch/x86/hvm/emulate.c
> @@ -566,7 +566,8 @@ static int hvmemul_virtual_to_linear(
>  
>      /* This is a singleton operation: fail it with an exception. */
>      hvmemul_ctxt->exn_pending = 1;
> -    hvmemul_ctxt->trap.vector = TRAP_gp_fault;
> +    hvmemul_ctxt->trap.vector =
> +        (seg == x86_seg_ss) ? TRAP_stack_error : TRAP_gp_fault;
>      hvmemul_ctxt->trap.type = X86_EVENTTYPE_HW_EXCEPTION;
>      hvmemul_ctxt->trap.error_code = 0;
>      hvmemul_ctxt->trap.insn_len = 0;
> diff --git a/xen/arch/x86/mm/shadow/common.c b/xen/arch/x86/mm/shadow/common.c
> index 559d4a4..226e32d 100644
> --- a/xen/arch/x86/mm/shadow/common.c
> +++ b/xen/arch/x86/mm/shadow/common.c
> @@ -148,7 +148,8 @@ static int hvm_translate_linear_addr(
>  
>      if ( !okay )
>      {
> -        hvm_inject_hw_exception(TRAP_gp_fault, 0);
> +        hvm_inject_hw_exception(
> +            (seg == x86_seg_ss) ? TRAP_stack_error : TRAP_gp_fault, 0);
>          return X86EMUL_EXCEPTION;
>      }
>  
> -- 
> 2.1.4
> 

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