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Re: [Xen-devel] [PATCH 1/2] x86/HVM: drop hvm_fetch_from_guest_linear()


  • To: Jan Beulich <JBeulich@xxxxxxxx>
  • From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • Date: Thu, 30 Aug 2018 13:22:44 +0100
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  • Cc: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Olaf Hering <olaf@xxxxxxxxx>, Paul Durrant <paul.durrant@xxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, Tim Deegan <tim@xxxxxxx>
  • Delivery-date: Thu, 30 Aug 2018 12:23:05 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
  • Openpgp: preference=signencrypt

On 30/08/18 13:02, Jan Beulich wrote:
>>>> On 30.08.18 at 13:18, <andrew.cooper3@xxxxxxxxxx> wrote:
>> On 30/08/18 12:09, Jan Beulich wrote:
>>> @@ -2512,9 +2512,10 @@ void hvm_emulate_init_per_insn(
>>>                                          hvm_access_insn_fetch,
>>>                                          &hvmemul_ctxt->seg_reg[x86_seg_cs],
>>>                                          &addr) &&
>>> -             hvm_fetch_from_guest_linear(hvmemul_ctxt->insn_buf, addr,
>>> -                                         sizeof(hvmemul_ctxt->insn_buf),
>>> -                                         pfec, NULL) == HVMTRANS_okay) ?
>>> +             hvm_copy_from_guest_linear(hvmemul_ctxt->insn_buf, addr,
>>> +                                        sizeof(hvmemul_ctxt->insn_buf),
>>> +                                        pfec | PFEC_insn_fetch, NULL,
>>> +                                        NULL) == HVMTRANS_okay) ?
>> Does this even compile?  You seem to have an extra NULL here and several
>> later places.
> It does - with "x86/HVM: implement memory read caching" also
> applied. IOW - I'm sorry, insufficient re-ordering work done
> when moving these two ahead.

Does it?  This patch has a mix of callers with 4 and 5 parameters, which
is why I noticed it in the first place.

With it fixed up to compile, and preferably with the other adjustment
included, Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

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