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Message-ID: <20230801103815.982686364@linutronix.de>
Date: Tue, 1 Aug 2023 12:46:59 +0200 (CEST)
From: Thomas Gleixner <tglx@...utronix.de>
To: LKML <linux-kernel@...r.kernel.org>
Cc: x86@...nel.org, Andrew Cooper <andrew.cooper3@...rix.com>,
Tom Lendacky <thomas.lendacky@....com>,
Paolo Bonzini <pbonzini@...hat.com>,
Wei Liu <wei.liu@...nel.org>,
Arjan van de Ven <arjan@...ux.intel.com>,
Juergen Gross <jgross@...e.com>,
Michael Kelley <mikelley@...rosoft.com>,
Peter Keresztes Schmidt <peter@...esztesschmidt.de>,
"Peter Zijlstra (Intel)" <peterz@...radead.org>
Subject: [patch V3 15/60] 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@...utronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
arch/x86/include/asm/mpspec.h | 1 -
arch/x86/kernel/apic/apic.c | 29 ++++++++++-------------------
arch/x86/kernel/mpparse.c | 11 ++---------
3 files changed, 12 insertions(+), 29 deletions(-)
--- a/arch/x86/include/asm/mpspec.h
+++ b/arch/x86/include/asm/mpspec.h
@@ -41,7 +41,6 @@ extern DECLARE_BITMAP(mp_bus_not_pci, MA
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;
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -172,7 +172,7 @@ static __init int setup_apicpmtimer(char
__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 l
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)
--- a/arch/x86/kernel/mpparse.c
+++ b/arch/x86/kernel/mpparse.c
@@ -378,11 +378,6 @@ static inline void __init construct_defa
int i;
/*
- * local APIC has default address
- */
- mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
-
- /*
* 2 CPUs, numbered 0 & 1.
*/
processor.type = MP_PROCESSOR;
@@ -523,10 +518,8 @@ void __init default_get_smp_config(unsig
*/
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;
}
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