[Xen-devel] [PATCH v2 1/2] hvm/vmx: save dr7 during vmx_vmcs_save

[Tamas K Lengyel <tlengyel@xxxxxxxxxxx>]

Sending the dr7 register during vm_events is useful for various applications,
but the current way the register value is gathered is incorrent. In this patch
we extend vmx_vmcs_save so that we get the correct value.

Suggested-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Signed-off-by: Tamas K Lengyel <tlengyel@xxxxxxxxxxx>
Cc: Jun Nakajima <jun.nakajima@xxxxxxxxx>
Cc: Kevin Tian <kevin.tian@xxxxxxxxx>
Cc: Keir Fraser <keir@xxxxxxx>
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/arch/x86/hvm/vmx/vmx.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/xen/arch/x86/hvm/vmx/vmx.c b/xen/arch/x86/hvm/vmx/vmx.c
index b9f340c..ae05794 100644
--- a/xen/arch/x86/hvm/vmx/vmx.c
+++ b/xen/arch/x86/hvm/vmx/vmx.c
@@ -490,6 +490,7 @@ static void vmx_vmcs_save(struct vcpu *v, struct hvm_hw_cpu 
*c)
     __vmread(GUEST_SYSENTER_CS, &c->sysenter_cs);
     __vmread(GUEST_SYSENTER_ESP, &c->sysenter_esp);
     __vmread(GUEST_SYSENTER_EIP, &c->sysenter_eip);
+    __vmread(GUEST_DR7, &c->dr7);
 
     c->pending_event = 0;
     c->error_code = 0;
-- 
2.1.4


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