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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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4
arch/arm64/kernel/hyp-stub.S
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@@ -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