[PATCH v7 15/23] arm64: Honor VHE being disabled from the command-line
From: Marc Zyngier <maz@kernel.org>
Date: 2021-02-08 10:23:19
Also in:
kvmarm, lkml
Subsystem:
arm64 port (aarch64 architecture), the rest · Maintainers:
Catalin Marinas, Will Deacon, Linus Torvalds
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 <redacted> Acked-by: Catalin Marinas <catalin.marinas@arm.com> --- arch/arm64/kernel/asm-offsets.c | 3 +++ arch/arm64/kernel/hyp-stub.S | 11 +++++++++++ 2 files changed, 14 insertions(+)
diff --git a/arch/arm64/kernel/asm-offsets.c b/arch/arm64/kernel/asm-offsets.c
index f42fd9e33981..1add0f21bffe 100644
--- a/arch/arm64/kernel/asm-offsets.c
+++ b/arch/arm64/kernel/asm-offsets.c@@ -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));
diff --git a/arch/arm64/kernel/hyp-stub.S b/arch/arm64/kernel/hyp-stub.S
index 6229315d533d..3e08dcc924b5 100644
--- a/arch/arm64/kernel/hyp-stub.S
+++ b/arch/arm64/kernel/hyp-stub.S@@ -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
--
2.29.2
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