[Xen-changelog] [xen stable-4.8] x86/VT-x: Fix determination of EFER.LMA in vmcs_dump_vcpu()

[patchbot@xxxxxxx]

commit 957ff3006e52cb185eb577ab1843bb25121c9284
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Wed Apr 18 16:50:55 2018 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Apr 18 16:50:55 2018 +0200

    x86/VT-x: Fix determination of EFER.LMA in vmcs_dump_vcpu()
    
    The LMA setting comes from the entry controls.
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Acked-by: Kevin Tian <kevin.tian@xxxxxxxxx>
    master commit: 82540b66ceb9318aa185f2488cbbbe479694de8f
    master date: 2018-04-11 11:06:55 +0100
---
 xen/arch/x86/hvm/vmx/vmcs.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/xen/arch/x86/hvm/vmx/vmcs.c b/xen/arch/x86/hvm/vmx/vmcs.c
index 8d7bd7b226..98a601f7fd 100644
--- a/xen/arch/x86/hvm/vmx/vmcs.c
+++ b/xen/arch/x86/hvm/vmx/vmcs.c
@@ -1780,7 +1780,10 @@ void vmcs_dump_vcpu(struct vcpu *v)
     vmentry_ctl = vmr32(VM_ENTRY_CONTROLS),
     vmexit_ctl = vmr32(VM_EXIT_CONTROLS);
     cr4 = vmr(GUEST_CR4);
-    efer = vmr(GUEST_EFER);
+
+    /* EFER.LMA is read as zero, and is loaded from vmentry_ctl on entry. */
+    BUILD_BUG_ON(VM_ENTRY_IA32E_MODE << 1 != EFER_LMA);
+    efer = vmr(GUEST_EFER) | ((vmentry_ctl & VM_ENTRY_IA32E_MODE) << 1);
 
     printk("*** Guest State ***\n");
     printk("CR0: actual=0x%016lx, shadow=0x%016lx, gh_mask=%016lx\n",
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.8

_______________________________________________
Xen-changelog mailing list
Xen-changelog@xxxxxxxxxxxxxxxxxxxx
https://lists.xenproject.org/xen-changelog