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Re: [PATCH v6 06/11] tools/libacpi: Use LUT of APIC IDs rather than function pointer
- To: Alejandro Vallejo <alejandro.vallejo@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 14 Oct 2024 08:26:34 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Mon, 14 Oct 2024 06:26:51 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 11.10.2024 18:17, Alejandro Vallejo wrote:
> On Wed Oct 9, 2024 at 3:25 PM BST, Jan Beulich wrote:
>> On 01.10.2024 14:38, Alejandro Vallejo wrote:
>>> @@ -148,7 +148,7 @@ static struct acpi_20_madt *construct_madt(struct
>>> acpi_ctxt *ctxt,
>>> lapic->length = sizeof(*lapic);
>>> /* Processor ID must match processor-object IDs in the DSDT. */
>>> lapic->acpi_processor_id = i;
>>> - lapic->apic_id = config->lapic_id(i);
>>> + lapic->apic_id = config->cpu_to_apicid[i];
>>
>> Perhaps assert (like you do in an earlier patch) that the ID is small
>> enough?
>
> Actually, I just remembered why I didn't. libacpi is pulled into libxl, which
> is integrated into libvirt. A failed assert here would kill the application,
> which is not very nice.
>
> HVM is already protected by the mp tables assert, so I'm not terribly worried
> about it and, while PVH is not, it would crash pretty quickly due to the
> corruption.
>
> I'd rather have the domain crashing rather than virt-manager.
Fair enough.
Jan
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