[PATCH v4 14/21] arm64: Honor VHE being disabled from the command-line
From: Marc Zyngier <maz@kernel.org>
Date: 2021-01-18 21:38:53
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> --- arch/arm64/kernel/hyp-stub.S | 17 ++++++++++++++--- 1 file changed, 14 insertions(+), 3 deletions(-)
diff --git a/arch/arm64/kernel/hyp-stub.S b/arch/arm64/kernel/hyp-stub.S
index 59820f9b8522..bbab2148a2a2 100644
--- a/arch/arm64/kernel/hyp-stub.S
+++ b/arch/arm64/kernel/hyp-stub.S@@ -77,13 +77,24 @@ SYM_CODE_END(el1_sync) SYM_CODE_START_LOCAL(mutate_to_vhe) // Sanity check: MMU *must* be off mrs x0, sctlr_el2 - tbnz x0, #0, 1f + tbnz x0, #0, 2f // Needs to be VHE capable, obviously mrs x0, id_aa64mmfr1_el1 ubfx x0, x0, #ID_AA64MMFR1_VHE_SHIFT, #4 - cbz x0, 1f + cbz x0, 2f + // Check whether VHE is disabled from the command line + adr_l x1, id_aa64mmfr1_val + ldr x0, [x1] + adr_l x1, id_aa64mmfr1_mask + ldr x1, [x1] + ubfx x0, x0, #ID_AA64MMFR1_VHE_SHIFT, #4 + ubfx x1, x1, #ID_AA64MMFR1_VHE_SHIFT, #4 + cbz x1, 1f + and x0, x0, x1 + cbz x0, 2f +1: // Engage the VHE magic! mov_q x0, HCR_HOST_VHE_FLAGS msr hcr_el2, x0
@@ -152,7 +163,7 @@ skip_spe: orr x0, x0, x1 msr spsr_el1, x0 -1: eret +2: eret SYM_CODE_END(mutate_to_vhe) .macro invalid_vector label
--
2.29.2
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