[Xen-devel] [PATCH] hvm/x86: fix x2APIC APIC_ID read emulation

[Wangzhenguo <wangzhenguo@xxxxxxxxxx>]

From 769b64a379c9b447cf5ad8a6f93560dedeb26f2a Mon Sep 17 00:00:00 2001
From: Zhenguo Wang <wangzhenguo@xxxxxxxxxx>
Date: Sun, 9 Jun 2013 10:08:48 +0800
Subject: [PATCH] hvm/x86: fix x2APIC APIC_ID read emulation

APIC and x2APIC have different format for APIC_ID register. Need translation.

Signed-off-by: Zhenguo Wang <wangzhenguo@xxxxxxxxxx>
Signed-off-by: Xiaowei Yang <xiaowei.yang@xxxxxxxxxx>
---
 xen/arch/x86/hvm/vlapic.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/xen/arch/x86/hvm/vlapic.c b/xen/arch/x86/hvm/vlapic.c
index 8c6a7e2..e0f6f06 100644
--- a/xen/arch/x86/hvm/vlapic.c
+++ b/xen/arch/x86/hvm/vlapic.c
@@ -584,6 +584,8 @@ int hvm_x2apic_msr_read(struct vcpu *v, unsigned int msr, 
uint64_t *msr_content)
     vlapic_read_aligned(vlapic, offset, &low);
     if ( offset == APIC_ICR )
         vlapic_read_aligned(vlapic, APIC_ICR2, &high);
+    else if ( offset == APIC_ID)
+        low = VLAPIC_ID(vlapic);
 
     *msr_content = (((uint64_t)high) << 32) | low;
     return 0;
--

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