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Re: [PATCH 1/3] acpi/processor: fix evaluating _PDC method when running as Xen dom0
- To: Roger Pau Monne <roger.pau@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 21 Nov 2022 15:02:30 +0100
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- Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, jgross@xxxxxxxx, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, x86@xxxxxxxxxx, "H. Peter Anvin" <hpa@xxxxxxxxx>, "Rafael J. Wysocki" <rafael@xxxxxxxxxx>, Len Brown <lenb@xxxxxxxxxx>, Alex Chiang <achiang@xxxxxx>, Venkatesh Pallipadi <venkatesh.pallipadi@xxxxxxxxx>, linux-acpi@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
- Delivery-date: Mon, 21 Nov 2022 14:02:53 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 21.11.2022 11:21, Roger Pau Monne wrote:
> @@ -47,6 +49,15 @@ static bool __init
> processor_physically_present(acpi_handle handle)
> return false;
> }
>
> + if (xen_initial_domain())
> + /*
> + * When running as a Xen dom0 the number of processors Linux
> + * sees can be different from the real number of processors on
> + * the system, and we still need to execute _PDC for all of
> + * them.
> + */
> + return xen_processor_present(acpi_id);
> +
> type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0;
> cpuid = acpi_get_cpuid(handle, type, acpi_id);
We had to deal with this in our XenoLinux forward ports as well, but at
the time it appeared upstream I decided to make use of acpi_get_apicid()
(which meanwhile was renamed to acpi_get_phys_id()). Wouldn't than be an
option, eliminating the need for a Xen-specific new function?
Jan
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