From: Avi Kivity <avi@redhat.com>
Date: Wed, 13 Jun 2012 13:30:53 +0000 (+0300)
Subject: KVM: x86 emulator: make loading TR set the busy bit
X-Git-Tag: next-20120724~30^2~20
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=869be99c7579c857885643ba2aed87ced339c6a2;p=karo-tx-linux.git

KVM: x86 emulator: make loading TR set the busy bit

Guest software doesn't actually depend on it, but vmx will refuse us
entry if we don't.  Set the bit in both the cached segment and memory,
just to be nice.

Signed-off-by: Avi Kivity <avi@redhat.com>
---

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 99e3df2bf880..92a1adde0b44 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -1335,7 +1335,7 @@ static int write_segment_descriptor(struct x86_emulate_ctxt *ctxt,
 static int load_segment_descriptor(struct x86_emulate_ctxt *ctxt,
 				   u16 selector, int seg)
 {
-	struct desc_struct seg_desc;
+	struct desc_struct seg_desc, old_desc;
 	u8 dpl, rpl, cpl;
 	unsigned err_vec = GP_VECTOR;
 	u32 err_code = 0;
@@ -1422,6 +1422,12 @@ static int load_segment_descriptor(struct x86_emulate_ctxt *ctxt,
 	case VCPU_SREG_TR:
 		if (seg_desc.s || (seg_desc.type != 1 && seg_desc.type != 9))
 			goto exception;
+		old_desc = seg_desc;
+		seg_desc.type |= 2; /* busy */
+		ret = ctxt->ops->cmpxchg_emulated(ctxt, desc_addr, &old_desc, &seg_desc,
+						  sizeof(seg_desc), &ctxt->exception);
+		if (ret != X86EMUL_CONTINUE)
+			return ret;
 		break;
 	case VCPU_SREG_LDTR:
 		if (seg_desc.s || seg_desc.type != 2)