From: Dongxiao Xu <dongxiao.xu@intel.com>
Date: Thu, 6 Dec 2012 16:54:26 +0000 (+0000)
Subject: nested vmx: fix rflags status in virtual vmexit
X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~7552
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=3d605ee7378409ed1d52a0591df963313bb8b4c5;p=xen.git

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@intel.com>
Signed-off-by: Dongxiao Xu <dongxiao.xu@intel.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Committed-by: Keir Fraser <keir@xen.org>
---

diff --git a/xen/arch/x86/hvm/vmx/vvmx.c b/xen/arch/x86/hvm/vmx/vvmx.c
index ec5e8a74f2..d8b7ce58c7 100644
--- a/xen/arch/x86/hvm/vmx/vvmx.c
+++ b/xen/arch/x86/hvm/vmx/vvmx.c
@@ -991,7 +991,8 @@ static void virtual_vmexit(struct cpu_user_regs *regs)
 
     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);