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openSUSE:Maintenance:8484
xen.openSUSE_Leap_42.3_Update
5b238b92-x86-HVM-account-for-fully-eager-FPU.patch
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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); + } } }
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