... just like e.g. SHLD/SHRD don't (see commit dee231b5a8 [x86emul: improve LOCK handling]).
Signed-off-by: Jan Beulich <[email protected]> --- a/xen/arch/x86/x86_emulate/x86_emulate.c +++ b/xen/arch/x86/x86_emulate/x86_emulate.c @@ -3853,6 +3853,7 @@ x86_emulate( break; case 0xc0 ... 0xc1: grp2: /* Grp2 */ + generate_exception_if(lock_prefix, EXC_UD); switch ( modrm_reg & 7 ) { case 0: /* rol */
x86emul: shifts/rotates don't allow LOCK prefix ... just like e.g. SHLD/SHRD don't (see commit dee231b5a8 [x86emul: improve LOCK handling]). Signed-off-by: Jan Beulich <[email protected]> --- a/xen/arch/x86/x86_emulate/x86_emulate.c +++ b/xen/arch/x86/x86_emulate/x86_emulate.c @@ -3853,6 +3853,7 @@ x86_emulate( break; case 0xc0 ... 0xc1: grp2: /* Grp2 */ + generate_exception_if(lock_prefix, EXC_UD); switch ( modrm_reg & 7 ) { case 0: /* rol */
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