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arm64: head: record CPU boot mode after enabling the MMU

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In order to avoid having to touch memory with the MMU and caches
disabled, and therefore having to invalidate it from the caches
explicitly, just defer storing the value until after the MMU has been
turned on, unless we are giving up with an error.

While at it, move the associated variable definitions into C code.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20220624150651.1358849-19-ardb@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Ard Biesheuvel 2022-06-24 17:06:48 +02:00 committed by Will Deacon
parent 6495b9ba62
commit 005e12676a
3 changed files with 23 additions and 39 deletions
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50
arch/arm64/kernel/head.S
View file

@ -82,6 +82,7 @@
* primary lowlevel boot path:
*
* Register Scope Purpose
* x20 primary_entry() .. __primary_switch() CPU boot mode
* x21 primary_entry() .. start_kernel() FDT pointer passed at boot in x0
* x22 create_idmap() .. start_kernel() ID map VA of the DT blob
* x23 primary_entry() .. start_kernel() physical misalignment/KASLR offset
@ -91,9 +92,9 @@
SYM_CODE_START(primary_entry)
bl preserve_boot_args
bl init_kernel_el // w0=cpu_boot_mode
mov x20, x0
adrp x23, __PHYS_OFFSET
and x23, x23, MIN_KIMG_ALIGN - 1 // KASLR offset, defaults to 0
bl set_cpu_boot_mode_flag
bl create_idmap
/*
@ -429,6 +430,9 @@ SYM_FUNC_START_LOCAL(__primary_switched)
sub x4, x4, x0 // the kernel virtual and
str_l x4, kimage_voffset, x5 // physical mappings
mov x0, x20
bl set_cpu_boot_mode_flag
// Clear BSS
adr_l x0, __bss_start
mov x1, xzr
@ -454,6 +458,7 @@ SYM_FUNC_START_LOCAL(__primary_switched)
ret // to __primary_switch()
0:
#endif
mov x0, x20
bl switch_to_vhe // Prefer VHE if possible
ldp x29, x30, [sp], #16
bl start_kernel
@ -553,52 +558,21 @@ SYM_FUNC_START_LOCAL(set_cpu_boot_mode_flag)
b.ne 1f
add x1, x1, #4
1: str w0, [x1] // Save CPU boot mode
dmb sy
dc ivac, x1 // Invalidate potentially stale cache line
ret
SYM_FUNC_END(set_cpu_boot_mode_flag)
/*
* These values are written with the MMU off, but read with the MMU on.
* Writers will invalidate the corresponding address, discarding up to a
* 'Cache Writeback Granule' (CWG) worth of data. The linker script ensures
* sufficient alignment that the CWG doesn't overlap another section.
*/
.pushsection ".mmuoff.data.write", "aw"
/*
* We need to find out the CPU boot mode long after boot, so we need to
* store it in a writable variable.
*
* This is not in .bss, because we set it sufficiently early that the boot-time
* zeroing of .bss would clobber it.
*/
SYM_DATA_START(__boot_cpu_mode)
.long BOOT_CPU_MODE_EL2
.long BOOT_CPU_MODE_EL1
SYM_DATA_END(__boot_cpu_mode)
/*
* The booting CPU updates the failed status @__early_cpu_boot_status,
* with MMU turned off.
*/
SYM_DATA_START(__early_cpu_boot_status)
.quad 0
SYM_DATA_END(__early_cpu_boot_status)
.popsection
/*
* This provides a "holding pen" for platforms to hold all secondary
* cores are held until we're ready for them to initialise.
*/
SYM_FUNC_START(secondary_holding_pen)
bl init_kernel_el // w0=cpu_boot_mode
bl set_cpu_boot_mode_flag
mrs x0, mpidr_el1
mrs x2, mpidr_el1
mov_q x1, MPIDR_HWID_BITMASK
and x0, x0, x1
and x2, x2, x1
adr_l x3, secondary_holding_pen_release
pen: ldr x4, [x3]
cmp x4, x0
cmp x4, x2
b.eq secondary_startup
wfe
b pen
@ -610,7 +584,6 @@ SYM_FUNC_END(secondary_holding_pen)
*/
SYM_FUNC_START(secondary_entry)
bl init_kernel_el // w0=cpu_boot_mode
bl set_cpu_boot_mode_flag
b secondary_startup
SYM_FUNC_END(secondary_entry)
@ -618,6 +591,7 @@ SYM_FUNC_START_LOCAL(secondary_startup)
/*
* Common entry point for secondary CPUs.
*/
mov x20, x0 // preserve boot mode
bl switch_to_vhe
bl __cpu_secondary_check52bitva
bl __cpu_setup // initialise processor
@ -629,6 +603,9 @@ SYM_FUNC_START_LOCAL(secondary_startup)
SYM_FUNC_END(secondary_startup)
SYM_FUNC_START_LOCAL(__secondary_switched)
mov x0, x20
bl set_cpu_boot_mode_flag
str_l xzr, __early_cpu_boot_status, x3
adr_l x5, vectors
msr vbar_el1, x5
isb
@ -691,7 +668,6 @@ SYM_FUNC_START(__enable_mmu)
b.lt __no_granule_support
cmp x3, #ID_AA64MMFR0_TGRAN_SUPPORTED_MAX
b.gt __no_granule_support
update_early_cpu_boot_status 0, x3, x4
phys_to_ttbr x2, x2
msr ttbr0_el1, x2 // load TTBR0
load_ttbr1 x1, x1, x3

4
arch/arm64/kernel/hyp-stub.S
View file

@ -223,11 +223,11 @@ SYM_FUNC_END(__hyp_reset_vectors)
/*
* Entry point to switch to VHE if deemed capable
*
* w0: boot mode, as returned by init_kernel_el()
*/
SYM_FUNC_START(switch_to_vhe)
// Need to have booted at EL2
adr_l x1, __boot_cpu_mode
ldr w0, [x1]
cmp w0, #BOOT_CPU_MODE_EL2
b.ne 1f

8
arch/arm64/mm/mmu.c
View file

@ -56,6 +56,14 @@ EXPORT_SYMBOL(kimage_vaddr);
u64 kimage_voffset __ro_after_init;
EXPORT_SYMBOL(kimage_voffset);
u32 __boot_cpu_mode[] = { BOOT_CPU_MODE_EL2, BOOT_CPU_MODE_EL1 };
/*
* The booting CPU updates the failed status @__early_cpu_boot_status,
* with MMU turned off.
*/
long __section(".mmuoff.data.write") __early_cpu_boot_status;
/*
* Empty_zero_page is a special page that is used for zero-initialized data
* and COW.