[Xen-changelog] [xen master] x86emul: correct {, v}{ld, st}mxcsr handling

[patchbot@xxxxxxx]

commit ff0bced09f91d0698c8a9b2b3c3c0b885cdff7e0
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Tue Mar 14 18:20:27 2017 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Mar 14 18:20:27 2017 +0100

    x86emul: correct {,v}{ld,st}mxcsr handling
    
    Calls to get_fpu() were missing. Calls to put_fpu() are deliberately
    not being added: Neither instruction can raise #XM, so the catch-all
    _put_fpu() is just fine here.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/arch/x86/x86_emulate/x86_emulate.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/xen/arch/x86/x86_emulate/x86_emulate.c 
b/xen/arch/x86/x86_emulate/x86_emulate.c
index 0cbeb31..4872f19 100644
--- a/xen/arch/x86/x86_emulate/x86_emulate.c
+++ b/xen/arch/x86/x86_emulate/x86_emulate.c
@@ -6509,6 +6509,7 @@ x86_emulate(
             vcpu_must_have(sse);
         ldmxcsr:
             generate_exception_if(src.type != OP_MEM, EXC_UD);
+            get_fpu(vex.opcx ? X86EMUL_FPU_ymm : X86EMUL_FPU_xmm, &fic);
             generate_exception_if(src.val & ~mxcsr_mask, EXC_GP, 0);
             asm volatile ( "ldmxcsr %0" :: "m" (src.val) );
             break;
@@ -6518,6 +6519,7 @@ x86_emulate(
             vcpu_must_have(sse);
         stmxcsr:
             generate_exception_if(dst.type != OP_MEM, EXC_UD);
+            get_fpu(vex.opcx ? X86EMUL_FPU_ymm : X86EMUL_FPU_xmm, &fic);
             asm volatile ( "stmxcsr %0" : "=m" (dst.val) );
             break;
 
--
generated by git-patchbot for /home/xen/git/xen.git#master

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