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arm64: mm: Prevent mismatched 52-bit VA support 

For cases where there is a mismatch in ARMv8.2-LVA support between CPUs
we have to be careful in allowing secondary CPUs to boot if 52-bit
virtual addresses have already been enabled on the boot CPU.

This patch adds code to the secondary startup path. If the boot CPU has
enabled 52-bit VAs then ID_AA64MMFR2_EL1 is checked to see if the
secondary can also enable 52-bit support. If not, the secondary is
prevented from booting and an error message is displayed indicating why.

Technically this patch could be implemented using the cpufeature code
when considering 52-bit userspace support. However, we employ low level
checks here as the cpufeature code won't be able to run if we have
mismatched 52-bit kernel va support.

Signed-off-by: Steve Capper <steve.capper@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Steve Capper 2018-12-06 22:50:40 +00:00 committed by Will Deacon
parent e842dfb5a2
commit a96a33b1ca
2 changed files with 31 additions and 0 deletions
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26
arch/arm64/kernel/head.S
View File

@ -707,6 +707,7 @@ secondary_startup:
/*
* Common entry point for secondary CPUs.
*/
bl __cpu_secondary_check52bitva
bl __cpu_setup // initialise processor
adrp x1, swapper_pg_dir
bl __enable_mmu
@ -785,6 +786,31 @@ ENTRY(__enable_mmu)
ret
ENDPROC(__enable_mmu)
ENTRY(__cpu_secondary_check52bitva)
#ifdef CONFIG_ARM64_52BIT_VA
ldr_l x0, vabits_user
cmp x0, #52
b.ne 2f
mrs_s x0, SYS_ID_AA64MMFR2_EL1
and x0, x0, #(0xf << ID_AA64MMFR2_LVA_SHIFT)
cbnz x0, 2f
adr_l x0, va52mismatch
mov w1, #1
strb w1, [x0]
dmb sy
dc ivac, x0 // Invalidate potentially stale cache line
update_early_cpu_boot_status CPU_STUCK_IN_KERNEL, x0, x1
1: wfe
wfi
b 1b
#endif
2: ret
ENDPROC(__cpu_secondary_check52bitva)
__no_granule_support:
/* Indicate that this CPU can't boot and is stuck in the kernel */
update_early_cpu_boot_status CPU_STUCK_IN_KERNEL, x1, x2

5
arch/arm64/kernel/smp.c
View File

@ -108,6 +108,7 @@ static int boot_secondary(unsigned int cpu, struct task_struct *idle)
}
static DECLARE_COMPLETION(cpu_running);
bool va52mismatch __ro_after_init;
int __cpu_up(unsigned int cpu, struct task_struct *idle)
{
@ -137,6 +138,10 @@ int __cpu_up(unsigned int cpu, struct task_struct *idle)
if (!cpu_online(cpu)) {
pr_crit("CPU%u: failed to come online\n", cpu);
if (IS_ENABLED(CONFIG_ARM64_52BIT_VA) && va52mismatch)
pr_crit("CPU%u: does not support 52-bit VAs\n", cpu);
ret = -EIO;
}
} else {