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Re: [XEN PATCH v2 13/15] x86/ioreq: guard VIO_realmode_completion with CONFIG_VMX
- To: Sergiy Kibrik <Sergiy_Kibrik@xxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 16 May 2024 14:11:28 +0200
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- Cc: Xenia Ragiadakou <burzalodowa@xxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Xenia Ragiadakou <xenia.ragiadakou@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 16 May 2024 12:11:37 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 15.05.2024 11:24, Sergiy Kibrik wrote:
> --- a/xen/arch/x86/hvm/emulate.c
> +++ b/xen/arch/x86/hvm/emulate.c
> @@ -2667,7 +2667,9 @@ static int _hvm_emulate_one(struct hvm_emulate_ctxt
> *hvmemul_ctxt,
> break;
>
> case VIO_mmio_completion:
> +#ifdef CONFIG_VMX
> case VIO_realmode_completion:
> +#endif
> BUILD_BUG_ON(sizeof(hvio->mmio_insn) <
> sizeof(hvmemul_ctxt->insn_buf));
> hvio->mmio_insn_bytes = hvmemul_ctxt->insn_buf_bytes;
> memcpy(hvio->mmio_insn, hvmemul_ctxt->insn_buf,
> hvio->mmio_insn_bytes);
This change doesn't buy us anything, does it?
> --- a/xen/arch/x86/hvm/ioreq.c
> +++ b/xen/arch/x86/hvm/ioreq.c
> @@ -33,6 +33,7 @@ bool arch_vcpu_ioreq_completion(enum vio_completion
> completion)
> {
> switch ( completion )
> {
> +#ifdef CONFIG_VMX
> case VIO_realmode_completion:
> {
> struct hvm_emulate_ctxt ctxt;
> @@ -43,6 +44,7 @@ bool arch_vcpu_ioreq_completion(enum vio_completion
> completion)
>
> break;
> }
> +#endif
>
> default:
> ASSERT_UNREACHABLE();
And while this change is needed for the goal of the series, I wonder whether
it wouldn't better be arch_vcpu_ioreq_completion() as whole that then gets
stubbed out.
Jan
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