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

[Andrew Cooper <andrew.cooper3@citrix.com>]

Raising #GP under such circumstances is architecturally wrong.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
---
CC: Jan Beulich <JBeulich@suse.com>
CC: Tim Deegan <tim@xen.org>
CC: Paul Durrant <paul.durrant@citrix.com>
CC: Wei Liu <wei.liu2@citrix.com>
---
 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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