[Xen-changelog] [xen-unstable] x86: recover pat value for bsp after S3 resume.

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1233836049 0
# Node ID 8303bd33d0304ed4f4edc94960c874eabad60563
# Parent  4c92a04f4f5ec6bfc07ff39783bf8a45765bb418
x86: 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=20
recovered which could make assigned device defunct after S3
resume

Signed-off-by Kevin Tian <kevin.tian@xxxxxxxxx>
---
 xen/arch/x86/acpi/suspend.c     |    3 +++
 xen/include/asm-x86/processor.h |    1 +
 2 files changed, 4 insertions(+)

diff -r 4c92a04f4f5e -r 8303bd33d030 xen/arch/x86/acpi/suspend.c
--- a/xen/arch/x86/acpi/suspend.c       Thu Feb 05 12:13:25 2009 +0000
+++ b/xen/arch/x86/acpi/suspend.c       Thu Feb 05 12:14:09 2009 +0000
@@ -65,6 +65,9 @@ void restore_rest_processor_state(void)
     /* 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 4c92a04f4f5e -r 8303bd33d030 xen/include/asm-x86/processor.h
--- a/xen/include/asm-x86/processor.h   Thu Feb 05 12:13:25 2009 +0000
+++ b/xen/include/asm-x86/processor.h   Thu Feb 05 12:14:09 2009 +0000
@@ -188,6 +188,7 @@ extern struct cpuinfo_x86 cpu_data[];
 #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];
 

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