[Xen-devel] [PATCH v3 2/8] x86/HVM: ignore guest INVD uses

[Jan Beulich <jbeulich@xxxxxxxx>]

The only place we'd expect the insn to be sensibly used is in
(virtualization unaware) firmware.

Suggested-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
---
v3: New.

--- a/xen/arch/x86/hvm/emulate.c
+++ b/xen/arch/x86/hvm/emulate.c
@@ -2210,11 +2210,18 @@ static int hvmemul_cache_op(
 
         hvmemul_unmap_linear_addr(mapping, addr, 0, hvmemul_ctxt);
         /* fall through */
-    case x86emul_invd:
     case x86emul_wbinvd:
     case x86emul_wbnoinvd:
         alternative_vcall(hvm_funcs.wbinvd_intercept);
         break;
+
+    case x86emul_invd:
+        /*
+         * Deliberately ignored: We don't want to issue INVD, and issuing 
WBINVD
+         * wouldn't match the request. And the only place we'd expect the insn
+         * to be sensibly used is in (virtualization unaware) firmware.
+         */
+        break;
     }
 
     return X86EMUL_OKAY;


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