From: Andrew Cooper <andrew.cooper3@citrix.com>
Date: Wed, 23 May 2018 16:53:17 +0000 (+0000)
Subject: x86/vmx: Drop VMX signal for full real-mode
X-Git-Tag: archive/raspbian/4.14.0+80-gd101b417b7-1+rpi1^2~63^2~3724
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=95a86b2a0582b59ce9e736d45f9191b79d655cbf;p=xen.git

x86/vmx: Drop VMX signal for full real-mode

The hvmloader code which used this signal was deleted 10 years ago (c/s
50b12df83 "x86 vmx: Remove vmxassist").  Furthermore, the value gets discarded
anyway because the HVM domain builder unconditionally sets %rax to 0 in the
same action it uses to set %rip to the appropriate entrypoint.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
---

diff --git a/xen/arch/x86/hvm/vmx/vmx.c b/xen/arch/x86/hvm/vmx/vmx.c
index 610c8d6eb9..20a8a69fbe 100644
--- a/xen/arch/x86/hvm/vmx/vmx.c
+++ b/xen/arch/x86/hvm/vmx/vmx.c
@@ -462,10 +462,6 @@ static int vmx_vcpu_initialise(struct vcpu *v)
 
     vmx_install_vlapic_mapping(v);
 
-    /* %eax == 1 signals full real-mode support to the guest loader. */
-    if ( v->vcpu_id == 0 )
-        v->arch.user_regs.rax = 1;
-
     return 0;
 }