[Xen-changelog] [xen-unstable] nested vmx: fix rflags status in virtual vmexit

[Xen patchbot-unstable <patchbot@xxxxxxx>]

# HG changeset patch
# User Dongxiao Xu <dongxiao.xu@xxxxxxxxx>
# Date 1354812866 0
# Node ID 312f0713dfc98635fd9ed4b42481581489faa28f
# Parent  bfd8e96fa3f157630f9698401a1f040ca1776c8e
nested vmx: fix rflags status in virtual vmexit

As stated in SDM, all bits (except for those 1-reserved) in rflags
would be set to 0 in VM exit. Therefore we need to follow this logic
in virtual_vmexit.

Signed-off-by: Xiantao Zhang <xiantao.zhang@xxxxxxxxx>
Signed-off-by: Dongxiao Xu <dongxiao.xu@xxxxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
Committed-by: Keir Fraser <keir@xxxxxxx>
---


diff -r bfd8e96fa3f1 -r 312f0713dfc9 xen/arch/x86/hvm/vmx/vvmx.c
--- a/xen/arch/x86/hvm/vmx/vvmx.c       Thu Dec 06 16:53:57 2012 +0000
+++ b/xen/arch/x86/hvm/vmx/vvmx.c       Thu Dec 06 16:54:26 2012 +0000
@@ -991,7 +991,8 @@ static void virtual_vmexit(struct cpu_us
 
     regs->eip = __get_vvmcs(nvcpu->nv_vvmcx, HOST_RIP);
     regs->esp = __get_vvmcs(nvcpu->nv_vvmcx, HOST_RSP);
-    regs->eflags = __vmread(GUEST_RFLAGS);
+    /* VM exit clears all bits except bit 1 */
+    regs->eflags = 0x2;
 
     /* updating host cr0 to sync TS bit */
     __vmwrite(HOST_CR0, v->arch.hvm_vmx.host_cr0);

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