[Xen-changelog] [xen staging] x86emul: unconditionally deliver #UD for LWP insns

[patchbot@xxxxxxx]

commit ca5ecd9207af9ca03e5e49f7279b1ec089e494ea
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Tue Jul 23 16:52:19 2019 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Jul 23 16:52:19 2019 +0200

    x86emul: unconditionally deliver #UD for LWP insns
    
    This is to accompany commit 91f86f8634 ("x86/svm: Drop support for AMD's
    Lightweight Profiling").
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/arch/x86/x86_emulate/x86_emulate.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/xen/arch/x86/x86_emulate/x86_emulate.c 
b/xen/arch/x86/x86_emulate/x86_emulate.c
index a0e203f5ae..2543661243 100644
--- a/xen/arch/x86/x86_emulate/x86_emulate.c
+++ b/xen/arch/x86/x86_emulate/x86_emulate.c
@@ -10525,6 +10525,16 @@ x86_emulate(
         }
         goto unrecognized_insn;
 
+    case X86EMUL_OPC_XOP(09, 0x12): /* XOP Grp3 */
+        switch ( modrm_reg & 7 )
+        {
+        case 0: /* llwpcb r */
+        case 1: /* slwpcb r */
+            /* LWP is unsupported, so produce #UD unconditionally. */
+            generate_exception(EXC_UD);
+        }
+        goto unrecognized_insn;
+
     case X86EMUL_OPC_XOP(09, 0x82): /* vfrczss xmm/m128,xmm */
     case X86EMUL_OPC_XOP(09, 0x83): /* vfrczsd xmm/m128,xmm */
         generate_exception_if(vex.l, EXC_UD);
@@ -10609,6 +10619,16 @@ x86_emulate(
         break;
     }
 
+    case X86EMUL_OPC_XOP(0a, 0x12): /* XOP Grp4 */
+        switch ( modrm_reg & 7 )
+        {
+        case 0: /* lwpins $imm32,r/m,r */
+        case 1: /* lwpval $imm32,r/m,r */
+            /* LWP is unsupported, so produce #UD unconditionally. */
+            generate_exception(EXC_UD);
+        }
+        goto unrecognized_insn;
+
     default:
     unimplemented_insn:
         rc = X86EMUL_UNIMPLEMENTED;
--
generated by git-patchbot for /home/xen/git/xen.git#staging

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