[Xen-devel] [PATCH v4 06/11] nested vmx: fix DR access VM exit

[Dongxiao Xu <dongxiao.xu@xxxxxxxxx>]

For DR register, we use lazy restore mechanism when access it. Therefore
when receiving such VM exit, L0 should be responsible to switch to the
right DR values, then inject to L1 hypervisor.

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 dab9551..02a7052 100644
--- a/xen/arch/x86/hvm/vmx/vvmx.c
+++ b/xen/arch/x86/hvm/vmx/vvmx.c
@@ -1641,7 +1641,8 @@ int nvmx_n2_vmexit_handler(struct cpu_user_regs *regs,
         break;
     case EXIT_REASON_DR_ACCESS:
         ctrl = __n2_exec_control(v);
-        if ( ctrl & CPU_BASED_MOV_DR_EXITING )
+        if ( (ctrl & CPU_BASED_MOV_DR_EXITING) &&
+            v->arch.hvm_vcpu.flag_dr_dirty )
             nvcpu->nv_vmexit_pending = 1;
         break;
     case EXIT_REASON_INVLPG:
-- 
1.7.1


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