On 14.07.2025 18:19, Andrew Cooper wrote:
> On 14/07/2025 5:02 pm, Jan Beulich wrote:
>> --- a/xen/arch/x86/x86_emulate/x86_emulate.c
>> +++ b/xen/arch/x86/x86_emulate/x86_emulate.c
>> @@ -5270,62 +5270,26 @@ x86_emulate(
>> break;
>>
>> case X86EMUL_OPC(0x0f, 0xbc): /* bsf or tzcnt
On 14.07.2025 18:19, Andrew Cooper wrote:
> On 14/07/2025 5:02 pm, Jan Beulich wrote:
>> SDM revision 087 points out that apparently as of quite some time ago on
>> Intel hardware BSF and BSR may alter all arithmetic flags, not just ZF.
>> Because of the inconsistency (and because documentation doe
On 14/07/2025 5:02 pm, Jan Beulich wrote:
> SDM revision 087 points out that apparently as of quite some time ago on
> Intel hardware BSF and BSR may alter all arithmetic flags, not just ZF.
> Because of the inconsistency (and because documentation doesn't look to
It's probably worth saying errata
SDM revision 087 points out that apparently as of quite some time ago on
Intel hardware BSF and BSR may alter all arithmetic flags, not just ZF.
Because of the inconsistency (and because documentation doesn't look to
be quite right about PF), best we can do is simply take the flag values
from what
