[Xen-devel] [PATCH v4 04/11] nested vmx: fix rflags status in virtual vmexit

[Dongxiao Xu <dongxiao.xu@xxxxxxxxx>]

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>
---
 xen/arch/x86/hvm/vmx/vvmx.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/xen/arch/x86/hvm/vmx/vvmx.c b/xen/arch/x86/hvm/vmx/vvmx.c
index ec5e8a7..d8b7ce5 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);
-- 
1.7.1


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