On Tue, May 12, 2020 at 11:08:12PM +0200, Joerg Roedel wrote:
> No, this is a recent addition, otherwise this breaks out-of-tree builds
> (make O=/some/path ...) because inat-tables.c (included from inat.c) is
> generated during build and ends up in the $(objtree).
Please add a blurb about this above it otherwise no one would have a
clue why it is there.
> Because the immediate is the last part of the instruction which is
> decoded (even if there is no immediate). The .got field is set when
> either the immediate was decoded successfully or, in case the
> instruction has no immediate, when the rest of the instruction was
> decoded successfully. So testing immediate.got is the indicator whether
> decoding was successful.
Hm, whether the immediate was parsed correctly or it wasn't there and
using that as the sign whether the instruction was decoded successfully
sounds kinda arbitrary.
@Masami: shouldn't that insn_get_length() thing return a value to denote
whether the decode was successful or not instead of testing arbitrary
fields?
Pasting for you the code sequence again:
...
insn_get_length(&ctxt->insn);
ret = ctxt->insn.immediate.got ? ES_OK : ES_DECODE_FAILED;
...
I wonder if one would be able to do instead:
if (insn_get_length(&ctxt->insn))
return ES_OK;
return ES_DECODE_FAILED;
to have it straight-forward...
> Probably better rename the function, it also does the sev-es protocol
> version negotiation and all other related setup tasks. Maybe
> sev_es_setup() is a better name?
Sure.
> If the above call fails its the end of the systems lifetime, because we
> can't continue to boot an SEV-ES guest when we have no GHCB.
>
> BUG_ON() and friends are also not available in the pre-decompression
> boot stage.
Oh ok, error() does hlt the system.
Thx.
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
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