[Xen-devel] [PATCH] s3: recover pat value for bsp after S3 resume.

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

recover pat value for bsp after S3 resume.

host pat is set to cover all memory types by Xen, which is
necessary to support guest mtrr/pat, especially when device
is passthroughed with VT-d. However pat on bsp is not 
recovered which could make assigned device defunct after S3
resume

Signed-off-by Kevin Tian <kevin.tian@xxxxxxxxx>

diff -r 0894164a95f4 xen/arch/x86/acpi/suspend.c
--- a/xen/arch/x86/acpi/suspend.c       Wed Feb 04 22:41:20 2009 -0500
+++ b/xen/arch/x86/acpi/suspend.c       Wed Feb 04 22:54:33 2009 -0500
@@ -65,6 +65,9 @@
     /* Reload FPU state on next FPU use. */
     stts();
 
+    if (cpu_has_pat)
+        wrmsrl(MSR_IA32_CR_PAT, host_pat);
+
     mtrr_ap_init();
     mcheck_init(&boot_cpu_data);
 }
diff -r 0894164a95f4 xen/include/asm-x86/processor.h
--- a/xen/include/asm-x86/processor.h   Wed Feb 04 22:41:20 2009 -0500
+++ b/xen/include/asm-x86/processor.h   Wed Feb 04 22:54:33 2009 -0500
@@ -188,6 +188,7 @@
 #define current_cpu_data boot_cpu_data
 #endif
 
+extern u64 host_pat;
 extern int phys_proc_id[NR_CPUS];
 extern int cpu_core_id[NR_CPUS];

s3_bsp_pat.patch
Description: s3_bsp_pat.patch

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