x86/apic: Prepare x2APIC for using apic::max_apic_id

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In order to remove the apic::apic_id_valid() callback and switch to
checking apic::max_apic_id, it is required to update apic::max_apic_id when
the APIC initialization code overrides it via x2apic_set_max_apicid().

Make the existing booleans a bitfield and add a flag which lets the update
function and the core code which switches the driver detect whether the
apic instance wants to have that update or not and apply it if required.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Michael Kelley <mikelley@microsoft.com>
Tested-by: Sohil Mehta <sohil.mehta@intel.com>
Tested-by: Juergen Gross <jgross@suse.com> # Xen PV (dom0 and unpriv. guest)

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This commit is contained in:

Thomas Gleixner 2023-08-08 15:04:11 -07:00 • committed by Dave Hansen

parent a9d608c22a

commit b5a5ce58d3

5 changed files with 14 additions and 4 deletions

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7

arch/x86/include/asm/apic.h

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1

arch/x86/kernel/apic/local.h

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4

arch/x86/kernel/apic/probe_64.c

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1

arch/x86/kernel/apic/x2apic_cluster.c

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5

arch/x86/kernel/apic/x2apic_phys.c

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