diff options
| author | Marc Zyngier <maz@kernel.org> | 2021-02-08 09:57:24 +0000 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2021-02-09 13:50:56 +0000 |
| commit | 41fac42c25338f4ea295b58106c26683d893a1c6 (patch) | |
| tree | d5f9473e038ad32877e82d854b4d35e64e8dc1bc /arch/arm64/kernel/hyp-stub.S | |
| parent | 361db0fca7affafa920f7d91bf93b9d9da44712f (diff) | |
arm64: Honor VHE being disabled from the command-line
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>
Diffstat (limited to 'arch/arm64/kernel/hyp-stub.S')
| -rw-r--r-- | arch/arm64/kernel/hyp-stub.S | 11 |
1 files changed, 11 insertions, 0 deletions
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 |