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Re: [Xen-devel] [PATCH 1/2] x86/HVM: drop hvm_fetch_from_guest_linear()
- To: Jan Beulich <JBeulich@xxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Thu, 30 Aug 2018 12:18:48 +0100
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- Cc: Tim Deegan <tim@xxxxxxx>, Olaf Hering <olaf@xxxxxxxxx>, Paul Durrant <paul.durrant@xxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>
- Delivery-date: Thu, 30 Aug 2018 11:18:59 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 30/08/18 12:09, Jan Beulich wrote:
> It can easily be expressed through hvm_copy_from_guest_linear(), and in
> two cases this even simplifies callers.
>
> Suggested-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
I really like this piece of cleanup, but...
> ---
> v2: New.
>
> --- a/xen/arch/x86/hvm/emulate.c
> +++ b/xen/arch/x86/hvm/emulate.c
> @@ -1060,6 +1060,8 @@ static int __hvmemul_read(
> pfec |= PFEC_implicit;
> else if ( hvmemul_ctxt->seg_reg[x86_seg_ss].dpl == 3 )
> pfec |= PFEC_user_mode;
> + if ( access_type == hvm_access_insn_fetch )
> + pfec |= PFEC_insn_fetch;
>
> rc = hvmemul_virtual_to_linear(
> seg, offset, bytes, &reps, access_type, hvmemul_ctxt, &addr);
> @@ -1071,9 +1073,7 @@ static int __hvmemul_read(
> (vio->mmio_gla == (addr & PAGE_MASK)) )
> return hvmemul_linear_mmio_read(addr, bytes, p_data, pfec,
> hvmemul_ctxt, 1);
>
> - rc = ((access_type == hvm_access_insn_fetch) ?
> - hvm_fetch_from_guest_linear(p_data, addr, bytes, pfec, &pfinfo) :
> - hvm_copy_from_guest_linear(p_data, addr, bytes, pfec, &pfinfo));
> + rc = hvm_copy_from_guest_linear(p_data, addr, bytes, pfec, &pfinfo);
>
> switch ( rc )
> {
> @@ -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.
~Andrew
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