File 5b238b92-x86-HVM-account-for-fully-eager-FPU.patch of Package xen.openSUSE_Leap_42.3_Update
# Commit e23d2234e08872ac1c719f3e338994581483440f
# Date 2018-06-15 11:49:06 +0200
# Author Jan Beulich <jbeulich@suse.com>
# Committer Jan Beulich <jbeulich@suse.com>
x86/HVM: account for fully eager FPU mode in emulation
In fully eager mode we must not clear fpu_dirtied, set CR0.TS, or invoke
the fpu_leave() hook. Instead do what the mode's name says: Restore
state right away.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
--- a/xen/arch/x86/hvm/emulate.c
+++ b/xen/arch/x86/hvm/emulate.c
@@ -1833,13 +1833,20 @@ static void hvmemul_put_fpu(
if ( backout == X86EMUL_FPU_fpu )
{
/*
- * To back out changes to the register file simply adjust state such
- * that upon next FPU insn use by the guest we'll reload the state
- * saved (or freshly loaded) by hvmemul_get_fpu().
+ * To back out changes to the register file
+ * - in fully eager mode, restore original state immediately,
+ * - in lazy mode, simply adjust state such that upon next FPU insn
+ * use by the guest we'll reload the state saved (or freshly loaded)
+ * by hvmemul_get_fpu().
*/
- curr->fpu_dirtied = false;
- stts();
- hvm_funcs.fpu_leave(curr);
+ if ( curr->arch.fully_eager_fpu )
+ vcpu_restore_fpu_eager(curr);
+ else
+ {
+ curr->fpu_dirtied = false;
+ stts();
+ hvm_funcs.fpu_leave(curr);
+ }
}
}