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Re: [PATCH v2 for-4.20? 6/6] PCI: drop pci_segments_init()
- To: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 4 Feb 2025 08:45:32 +0100
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Volodymyr Babchuk <volodymyr_babchuk@xxxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>
- Delivery-date: Tue, 04 Feb 2025 07:45:43 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 03.02.2025 18:18, Roger Pau Monné wrote:
> On Mon, Feb 03, 2025 at 05:27:24PM +0100, Jan Beulich wrote:
>> --- a/xen/arch/x86/x86_64/mmconfig-shared.c
>> +++ b/xen/arch/x86/x86_64/mmconfig-shared.c
>> @@ -402,6 +402,9 @@ void __init acpi_mmcfg_init(void)
>> {
>> bool valid = true;
>>
>> + if ( pci_add_segment(0) )
>> + panic("Could not initialize PCI segment 0\n");
>
> Do you still need the pci_add_segment() call here?
>
> pci_add_device() will already add the segments as required, and
> acpi_parse_mcfg() does also add the segments described in the MCFG.
Well, in principle you're right. It's more the action in case of
failure that makes me want to keep it: We won't fare very well on
about every system if we can't register segment 0.
Jan
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