[Xen-4.0][PATCH] xsave: move xsave initialization code to a common place

[Xen-4.0][PATCH] xsave: move xsave initialization code to a common place

[Wei Huang]

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Please apply this patch to xen-4.0 tree.


This patch moves xsave option setting and initilization to CPU common
file. Without this Xen would crash on __context_switch() on xsave-capable
AMD CPUs. The crash was due to cpu_has_xsave reports true in domain.c
while xsave space wasn't initialized. This patch is adopted from xen
upstream.

Signed-off-by: Wei Huang <wei.huang2@amd.com>



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# HG changeset patch
# User Wei Huang <wei.huang2@amd.com>
# Date 1319469115 18000
# Branch patches
# Node ID c863dbcd714987ca8f1ab93ffbf61ea64b394f23
# Parent  71b96c0b083f3de46f566a406e0aee16a427950f
xsave: Move xsave initialization code to a common place

This patch moves xsave option setting and initilization to CPU common
file. Without this Xen would crash on __context_switch() on xsave-capable
AMD CPUs. The crash was due to cpu_has_xsave reports true in domain.c
while xsave space wasn't initialized. This patch is adopted from xen
upstream.

Signed-off-by: Wei Huang <wei.huang2@amd.com>

diff -r 71b96c0b083f -r c863dbcd7149 xen/arch/x86/cpu/common.c
--- a/xen/arch/x86/cpu/common.c	Mon Oct 24 10:04:25 2011 -0500
+++ b/xen/arch/x86/cpu/common.c	Mon Oct 24 10:11:55 2011 -0500
@@ -22,6 +22,9 @@
 static int disable_x86_fxsr __cpuinitdata;
 static int disable_x86_serial_nr __cpuinitdata;
 
+static int use_xsave;
+boolean_param("xsave", use_xsave);
+
 struct cpu_dev * cpu_devs[X86_VENDOR_NUM] = {};
 
 /*
@@ -391,6 +394,13 @@
 	if (this_cpu->c_init)
 		this_cpu->c_init(c);
 
+        /* Initialize xsave/xrstor features */
+	if ( !use_xsave )
+		clear_bit(X86_FEATURE_XSAVE, boot_cpu_data.x86_capability);
+
+	if ( cpu_has_xsave )
+		xsave_init();
+
 	/* Disable the PN if appropriate */
 	squash_the_stupid_serial_number(c);
 
diff -r 71b96c0b083f -r c863dbcd7149 xen/arch/x86/cpu/intel.c
--- a/xen/arch/x86/cpu/intel.c	Mon Oct 24 10:04:25 2011 -0500
+++ b/xen/arch/x86/cpu/intel.c	Mon Oct 24 10:11:55 2011 -0500
@@ -30,9 +30,6 @@
 integer_param("cpuid_mask_ecx", opt_cpuid_mask_ecx);
 integer_param("cpuid_mask_edx", opt_cpuid_mask_edx);
 
-static int use_xsave;
-boolean_param("xsave", use_xsave);
-
 #ifdef CONFIG_X86_INTEL_USERCOPY
 /*
  * Alignment at which movsl is preferred for bulk memory copies.
@@ -219,12 +216,6 @@
 		set_bit(X86_FEATURE_ARAT, c->x86_capability);
 
 	start_vmx();
-
-	if ( !use_xsave )
-		clear_bit(X86_FEATURE_XSAVE, boot_cpu_data.x86_capability);
-
-	if ( cpu_has_xsave )
-		xsave_init();
 }
 
 

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