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arm64: kexec: relocate in EL1 mode

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Since we are going to keep MMU enabled during relocation, we need to
keep EL1 mode throughout the relocation.

Keep EL1 enabled, and switch EL2 only before entering the new world.

Suggested-by: James Morse <james.morse@arm.com>
Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20210930143113.1502553-10-pasha.tatashin@soleen.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Pasha Tatashin
2021-09-30 14:31:07 +00:00
committed by Will Deacon
parent 08eae0ef61
commit ba959fe96a
3 changed files with 14 additions and 6 deletions
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13
arch/arm64/kernel/relocate_kernel.S
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@@ -13,6 +13,7 @@
#include <asm/kexec.h>
#include <asm/page.h>
#include <asm/sysreg.h>
#include <asm/virt.h>
/*
* arm64_relocate_new_kernel - Put a 2nd stage image in place and boot it.
@@ -61,12 +62,20 @@ SYM_CODE_START(arm64_relocate_new_kernel)
isb
/* Start new image. */
ldr x1, [x0, #KIMAGE_ARCH_EL2_VECTORS] /* relocation start */
cbz x1, .Lel1
ldr x1, [x0, #KIMAGE_START] /* relocation start */
ldr x2, [x0, #KIMAGE_ARCH_DTB_MEM] /* dtb address */
mov x3, xzr
mov x4, xzr
mov x0, #HVC_SOFT_RESTART
hvc #0 /* Jumps from el2 */
.Lel1:
ldr x4, [x0, #KIMAGE_START] /* relocation start */
ldr x0, [x0, #KIMAGE_ARCH_DTB_MEM] /* dtb address */
mov x1, xzr
mov x2, xzr
mov x3, xzr
br x4
br x4 /* Jumps from el1 */
SYM_CODE_END(arm64_relocate_new_kernel)
.align 3 /* To keep the 64-bit values below naturally aligned. */