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Re: [PATCH v3] x86/hvmloader: select xenpci MMIO BAR UC or WB MTRR cache attribute
- To: Roger Pau Monne <roger.pau@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 10 Jun 2025 17:45:52 +0200
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- Cc: Anthony PERARD <anthony.perard@xxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Anthoine Bourgeois <anthoine.bourgeois@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Tue, 10 Jun 2025 15:46:11 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 05.06.2025 18:16, Roger Pau Monne wrote:
> @@ -271,6 +279,43 @@ void pci_setup(void)
> if ( bar_sz == 0 )
> continue;
>
> + if ( !xenpci_bar_uc &&
> + ((bar_data & PCI_BASE_ADDRESS_SPACE) ==
> + PCI_BASE_ADDRESS_SPACE_MEMORY) &&
> + vendor_id == 0x5853 &&
> + (device_id == 0x0001 || device_id == 0x0002) )
> + {
> + if ( is_64bar )
> + {
> + printf("xenpci dev %02x:%x unexpected MMIO 64bit
> BAR%u\n",
> + devfn >> 3, devfn & 7, bar);
> + continue;
> + }
> +
> + if ( bar_sz > pci_mem_end ||
> + ((pci_mem_end - bar_sz) & ~(bar_sz - 1)) <
> pci_mem_start )
> + {
> + printf("xenpci dev %02x:%x BAR%u size %llx overflows
> low PCI hole\n",
> + devfn >> 3, devfn & 7, bar, bar_sz);
> + continue;
> + }
Is "continue" really the right way of handling the problem here? We didn't
skip this BAR prior to your changes just because of either of these being
true.
Jan
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