[Xen-changelog] [xen stable-4.3] x86/xsave: also save/restore XCR0 across suspend (ACPI S3)

[patchbot@xxxxxxx]

commit 92503639bd8bedd7f9097629f77e2de5a31659b2
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Fri Nov 15 11:20:04 2013 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Fri Nov 15 11:20:04 2013 +0100

    x86/xsave: also save/restore XCR0 across suspend (ACPI S3)
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Acked-by: Keir Fraser <keir@xxxxxxx>
    master commit: e47a90e6dca491c0ceea6ffa18055e7e32565e8e
    master date: 2013-10-21 17:26:16 +0200
---
 xen/arch/x86/acpi/suspend.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/xen/arch/x86/acpi/suspend.c b/xen/arch/x86/acpi/suspend.c
index c690b45..f4cc041 100644
--- a/xen/arch/x86/acpi/suspend.c
+++ b/xen/arch/x86/acpi/suspend.c
@@ -13,12 +13,14 @@
 #include <asm/hvm/hvm.h>
 #include <asm/hvm/support.h>
 #include <asm/i387.h>
+#include <asm/xstate.h>
 #include <xen/hypercall.h>
 
 static unsigned long saved_lstar, saved_cstar;
 static unsigned long saved_sysenter_esp, saved_sysenter_eip;
 static unsigned long saved_fs_base, saved_gs_base, saved_kernel_gs_base;
 static uint16_t saved_segs[4];
+static uint64_t saved_xcr0;
 
 void save_rest_processor_state(void)
 {
@@ -38,6 +40,8 @@ void save_rest_processor_state(void)
         rdmsrl(MSR_IA32_SYSENTER_ESP, saved_sysenter_esp);
         rdmsrl(MSR_IA32_SYSENTER_EIP, saved_sysenter_eip);
     }
+    if ( cpu_has_xsave )
+        saved_xcr0 = get_xcr0();
 }
 
 
@@ -77,6 +81,9 @@ void restore_rest_processor_state(void)
         do_set_segment_base(SEGBASE_GS_USER_SEL, saved_segs[3]);
     }
 
+    if ( cpu_has_xsave && !set_xcr0(saved_xcr0) )
+        BUG();
+
     /* Maybe load the debug registers. */
     BUG_ON(is_hvm_vcpu(curr));
     if ( !is_idle_vcpu(curr) && curr->arch.debugreg[7] )
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.3

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