x86/HVM: attempts to emulate FPU insns need to set fpu_initialised

My original way of thinking here was that this would be set anyway at
the point state gets reloaded after the adjustments hvmemul_put_fpu()
does, but the flag should already be set before that - after all the
guest may never again touch the FPU before e.g. getting migrated/saved.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Paul Durrant <paul.durrant@citrix.com>
Release-acked-by: Juergen Gross <jgross@suse.com>
master commit: 3310e3cd648f3713c824790bd71d8ec405a09d05
master date: 2018-06-26 08:41:08 +0200

diff --git a/xen/arch/x86/hvm/emulate.c b/xen/arch/x86/hvm/emulate.c
index 03a4944e880c6e6643246f26598c76cc56e107d5..7ecee12ffc353c1767de11c9affe723ecbce8e6c 100644 (file)
--- a/xen/arch/x86/hvm/emulate.c
+++ b/xen/arch/x86/hvm/emulate.c
@@ -2053,6 +2053,7 @@ static int hvmemul_get_fpu(
          * masking of all exceptions by FNSTENV.)
          */
         save_fpu_enable();
+        curr->fpu_initialised = true;
         curr->fpu_dirtied = true;
         if ( (fpu_ctxt->fcw & 0x3f) != 0x3f )
         {