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Re: [PATCH 16/17] Handle PCIe ECAM space access from guests


  • To: Thierry Escande <thierry.escande@xxxxxxxxxx>
  • From: Jan Beulich <jbeulich@xxxxxxxx>
  • Date: Mon, 4 May 2026 17:22:52 +0200
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  • Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
  • Delivery-date: Mon, 04 May 2026 15:22:54 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

On 13.03.2026 17:35, Thierry Escande wrote:
> @@ -298,6 +300,19 @@ bool arch_ioreq_server_get_type_addr(const struct domain 
> *d,
>                  *addr |= CF8_ADDR_HI(cf8);
>          }
>      }
> +    else if ( p->type == IOREQ_TYPE_COPY &&
> +              (mmio_start >= d->arch.ecam_addr &&
> +               mmio_start < (d->arch.ecam_addr + d->arch.ecam_size)) )
> +    {
> +        pci_sbdf_t sbdf;
> +        unsigned int reg = mmio_start & ~PAGE_MASK;

If you use PAGE_MASK here, ...

> +        sbdf.bdf =  (((mmio_start - d->arch.ecam_addr) & 0x0ffff000) >> 12);

... why not PAGE_SHIFT here? And why the masking by 0x0ffff000? Doesn't the
earlier range check make this unnecessary (as long as .ecam_size is plausible)?

Finally, nit: There's a stray blank after the =, and one pair of parentheses
could perhaps also be dropped.

Jan



 


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