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arm64: Honor VHE being disabled from the command-line

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Finally we can check whether VHE is disabled on the command line,
and not enable it if that's the user's wish.

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/20210208095732.3267263-16-maz@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Marc Zyngier 2021-02-08 09:57:24 +00:00 committed by Will Deacon
parent 361db0fca7
commit 41fac42c25
2 changed files with 14 additions and 0 deletions
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3
arch/arm64/kernel/asm-offsets.c
View File

@ -99,6 +99,9 @@ int main(void)
DEFINE(CPU_BOOT_STACK, offsetof(struct secondary_data, stack));
DEFINE(CPU_BOOT_TASK, offsetof(struct secondary_data, task));
BLANK();
DEFINE(FTR_OVR_VAL_OFFSET, offsetof(struct arm64_ftr_override, val));
DEFINE(FTR_OVR_MASK_OFFSET, offsetof(struct arm64_ftr_override, mask));
BLANK();
#ifdef CONFIG_KVM
DEFINE(VCPU_CONTEXT, offsetof(struct kvm_vcpu, arch.ctxt));
DEFINE(VCPU_FAULT_DISR, offsetof(struct kvm_vcpu, arch.fault.disr_el1));

11
arch/arm64/kernel/hyp-stub.S
View File

@ -87,6 +87,17 @@ SYM_CODE_START_LOCAL(mutate_to_vhe)
ubfx x1, x1, #ID_AA64MMFR1_VHE_SHIFT, #4
cbz x1, 1f
// Check whether VHE is disabled from the command line
adr_l x1, id_aa64mmfr1_override
ldr x2, [x1, FTR_OVR_VAL_OFFSET]
ldr x1, [x1, FTR_OVR_MASK_OFFSET]
ubfx x2, x2, #ID_AA64MMFR1_VHE_SHIFT, #4
ubfx x1, x1, #ID_AA64MMFR1_VHE_SHIFT, #4
cmp x1, xzr
and x2, x2, x1
csinv x2, x2, xzr, ne
cbz x2, 1f
// Engage the VHE magic!
mov_q x0, HCR_HOST_VHE_FLAGS
msr hcr_el2, x0