From: Jan Beulich <jbeulich@suse.com>
To: Roger Pau Monne <roger.pau@citrix.com>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>, Wei Liu <wl@xen.org>,
xen-devel@lists.xenproject.org
Subject: Re: [PATCH] x86/x2apic: remove usage of ACPI_FADT_APIC_CLUSTER
Date: Mon, 30 Oct 2023 15:13:50 +0100 [thread overview]
Message-ID: <77a0297d-3b47-6679-94a3-1463f642aa72@suse.com> (raw)
In-Reply-To: <20231024102630.47691-1-roger.pau@citrix.com>
On 24.10.2023 12:26, Roger Pau Monne wrote:
> The ACPI FADT APIC_CLUSTER flag mandates that when the interrupt delivery is
> Logical mode APIC must be configured for Cluster destination model. However in
> apic_x2apic_probe() such flag is incorrectly used to gate whether Physical mode
> can be used.
>
> Since Xen when in x2APIC mode only uses Logical mode together with Cluster
> model completely remove checking for ACPI_FADT_APIC_CLUSTER, as Xen always
> fulfills the requirement signaled by the flag.
Actually, one remark: The text in the 6.5 spec really only mentions xAPIC
mode, so it's not entirely clear whether the two flags actually have any
meaning for x2APIC mode.
Jan
next prev parent reply other threads:[~2023-10-30 14:14 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-24 10:26 [PATCH] x86/x2apic: remove usage of ACPI_FADT_APIC_CLUSTER Roger Pau Monne
2023-10-30 14:12 ` Jan Beulich
2023-10-30 14:13 ` Jan Beulich [this message]
2023-10-30 16:19 ` Roger Pau Monné
2023-10-30 16:32 ` Jan Beulich
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