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x86/apic: Split register_apic_address()

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Split the fixmap setup out of register_lapic_address() and reuse it when
the X2APIC is disabled during setup.

This avoids registering the APIC ID (setting 'mp_lapic_addr') twice.

[ dhansen: changelog wording tweak ]

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)
This commit is contained in:
Thomas Gleixner 2023-08-08 15:03:48 -07:00 • committed by Dave Hansen
parent 1751adedbd
commit 5a88f354dc
1 changed files with 14 additions and 8 deletions
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22
arch/x86/kernel/apic/apic.c
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@ -1852,6 +1852,8 @@ void x2apic_setup(void)
__x2apic_enable();
}
static __init void apic_set_fixmap(void);
static __init void x2apic_disable(void)
{
u32 x2apic_id, state = x2apic_state;
@ -1872,7 +1874,7 @@ static __init void x2apic_disable(void)
}
__x2apic_disable();
register_lapic_address(mp_lapic_addr);
apic_set_fixmap();
}
static __init void x2apic_enable(void)
@ -2145,17 +2147,21 @@ void __init init_apic_mappings(void)
}
}
static __init void apic_set_fixmap(void)
{
set_fixmap_nocache(FIX_APIC_BASE, mp_lapic_addr);
apic_mmio_base = APIC_BASE;
apic_printk(APIC_VERBOSE, "mapped APIC to %16lx (%16lx)\n",
apic_mmio_base, mp_lapic_addr);
apic_read_boot_cpu_id(false);
}
void __init register_lapic_address(unsigned long address)
{
mp_lapic_addr = address;
if (x2apic_mode)
return;
set_fixmap_nocache(FIX_APIC_BASE, address);
apic_mmio_base = APIC_BASE;
apic_printk(APIC_VERBOSE, "mapped APIC to %16lx (%16lx)\n", APIC_BASE, address);
apic_read_boot_cpu_id(false);
if (!x2apic_mode)
apic_set_fixmap();
}
/*