diff options
| author | Marc Zyngier <maz@kernel.org> | 2021-02-08 09:57:14 +0000 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2021-02-09 13:47:07 +0000 |
| commit | 0c93df9622d4d921bcd0dc83f71fed9e98f5119f (patch) | |
| tree | 73019ad94842d05353ba18096698a48be9e38631 /arch/arm64/kernel/head.S | |
| parent | f359182291c757cdf77bcd014c025d1ed6b87662 (diff) | |
arm64: Initialise as nVHE before switching to VHE
As we are aiming to be able to control whether we enable VHE or
not, let's always drop down to EL1 first, and only then upgrade
to VHE if at all possible.
This means that if the kernel is booted at EL2, we always start
with a nVHE init, drop to EL1 to initialise the the kernel, and
only then upgrade the kernel EL to EL2 if possible (the process
is obviously shortened for secondary CPUs).
The resume path is handled similarly to a secondary CPU boot.
Signed-off-by: Marc Zyngier <maz@kernel.org>
Acked-by: David Brazdil <dbrazdil@google.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20210208095732.3267263-6-maz@kernel.org
[will: Avoid calling switch_to_vhe twice on kaslr path]
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'arch/arm64/kernel/head.S')
| -rw-r--r-- | arch/arm64/kernel/head.S | 38 |
1 files changed, 2 insertions, 36 deletions
diff --git a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S index 28e9735302df..ec66dc061b0c 100644 --- a/arch/arm64/kernel/head.S +++ b/arch/arm64/kernel/head.S @@ -447,6 +447,7 @@ SYM_FUNC_START_LOCAL(__primary_switched) ret // to __primary_switch() 0: #endif + bl switch_to_vhe // Prefer VHE if possible add sp, sp, #16 mov x29, #0 mov x30, #0 @@ -493,42 +494,6 @@ SYM_INNER_LABEL(init_el1, SYM_L_LOCAL) eret SYM_INNER_LABEL(init_el2, SYM_L_LOCAL) -#ifdef CONFIG_ARM64_VHE - /* - * Check for VHE being present. x2 being non-zero indicates that we - * do have VHE, and that the kernel is intended to run at EL2. - */ - mrs x2, id_aa64mmfr1_el1 - ubfx x2, x2, #ID_AA64MMFR1_VHE_SHIFT, #4 -#else - mov x2, xzr -#endif - cbz x2, init_el2_nvhe - - /* - * When VHE _is_ in use, EL1 will not be used in the host and - * requires no configuration, and all non-hyp-specific EL2 setup - * will be done via the _EL1 system register aliases in __cpu_setup. - */ - mov_q x0, HCR_HOST_VHE_FLAGS - msr hcr_el2, x0 - isb - - init_el2_state vhe - - isb - - mov_q x0, INIT_PSTATE_EL2 - msr spsr_el2, x0 - msr elr_el2, lr - mov w0, #BOOT_CPU_MODE_EL2 - eret - -SYM_INNER_LABEL(init_el2_nvhe, SYM_L_LOCAL) - /* - * When VHE is not in use, early init of EL2 and EL1 needs to be - * done here. - */ mov_q x0, INIT_SCTLR_EL1_MMU_OFF msr sctlr_el1, x0 @@ -623,6 +588,7 @@ SYM_FUNC_START_LOCAL(secondary_startup) /* * Common entry point for secondary CPUs. */ + bl switch_to_vhe bl __cpu_secondary_check52bitva bl __cpu_setup // initialise processor adrp x1, swapper_pg_dir |