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x86/apic: Sanitize APIC address setup 

Convert places which just write mp_lapic_addr and let them register the
local APIC address directly instead of relying on magic other code to do
so.

Add a WARN_ON() into register_lapic_address() which is raised when
register_lapic_address() is invoked more than once during boot.

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 15:03:49 -07:00 committed by Dave Hansen
parent 5a88f354dc
commit 81287ad65d
3 changed files with 12 additions and 29 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/x86/include/asm/mpspec.h
View File

@ -41,7 +41,6 @@ extern DECLARE_BITMAP(mp_bus_not_pci, MAX_MP_BUSSES);
extern unsigned int boot_cpu_physical_apicid;
extern u8 boot_cpu_apic_version;
extern unsigned long mp_lapic_addr;
#ifdef CONFIG_X86_LOCAL_APIC
extern int smp_found_config;

29
arch/x86/kernel/apic/apic.c
View File

@ -172,7 +172,7 @@ static __init int setup_apicpmtimer(char *s)
__setup("apicpmtimer", setup_apicpmtimer);
#endif
unsigned long mp_lapic_addr __ro_after_init;
static unsigned long mp_lapic_addr __ro_after_init;
bool apic_is_disabled __ro_after_init;
/* Disable local APIC timer from the kernel commandline or via dmi quirk */
static int disable_apic_timer __initdata;
@ -2009,12 +2009,12 @@ static bool __init detect_init_APIC(void)
return false;
}
mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
register_lapic_address(APIC_DEFAULT_PHYS_BASE);
return true;
}
#else
static bool __init apic_verify(void)
static bool __init apic_verify(unsigned long addr)
{
u32 features, h, l;
@ -2028,15 +2028,15 @@ static bool __init apic_verify(void)
return false;
}
set_cpu_cap(&boot_cpu_data, X86_FEATURE_APIC);
mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
/* The BIOS may have set up the APIC at some other address */
if (boot_cpu_data.x86 >= 6) {
rdmsr(MSR_IA32_APICBASE, l, h);
if (l & MSR_IA32_APICBASE_ENABLE)
mp_lapic_addr = l & MSR_IA32_APICBASE_BASE;
addr = l & MSR_IA32_APICBASE_BASE;
}
register_lapic_address(addr);
pr_info("Found and enabled local APIC!\n");
return true;
}
@ -2063,7 +2063,7 @@ bool __init apic_force_enable(unsigned long addr)
enabled_via_apicbase = 1;
}
}
return apic_verify();
return apic_verify(addr);
}
/*
@ -2105,7 +2105,7 @@ static bool __init detect_init_APIC(void)
if (!apic_force_enable(APIC_DEFAULT_PHYS_BASE))
return false;
} else {
if (!apic_verify())
if (!apic_verify(APIC_DEFAULT_PHYS_BASE))
return false;
}
@ -2130,27 +2130,16 @@ void __init init_apic_mappings(void)
if (x2apic_mode)
return;
/* If no local APIC can be found return early */
if (!smp_found_config && !detect_init_APIC()) {
/* lets NOP'ify apic operations */
pr_info("APIC: disable apic facility\n");
apic_disable();
} else {
apic_phys = mp_lapic_addr;
/*
* If the system has ACPI MADT tables or MP info, the LAPIC
* address is already registered.
*/
if (!acpi_lapic && !smp_found_config)
register_lapic_address(apic_phys);
}
}
static __init void apic_set_fixmap(void)
{
set_fixmap_nocache(FIX_APIC_BASE, mp_lapic_addr);
apic_mmio_base = APIC_BASE;
apic_phys = 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);
@ -2158,6 +2147,8 @@ static __init void apic_set_fixmap(void)
void __init register_lapic_address(unsigned long address)
{
/* This should only happen once */
WARN_ON_ONCE(mp_lapic_addr);
mp_lapic_addr = address;
if (!x2apic_mode)

11
arch/x86/kernel/mpparse.c
View File

@ -374,11 +374,6 @@ static inline void __init construct_default_ISA_mptable(int mpc_default_type)
int linttypes[2] = { mp_ExtINT, mp_NMI };
int i;
/*
* local APIC has default address
*/
mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
/*
* 2 CPUs, numbered 0 & 1.
*/
@ -520,10 +515,8 @@ void __init default_get_smp_config(unsigned int early)
*/
if (mpf->feature1) {
if (early) {
/*
* local APIC has default address
*/
mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
/* Local APIC has default address */
register_lapic_address(APIC_DEFAULT_PHYS_BASE);
goto out;
}