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| author | Dave Martin <Dave.Martin@arm.com> | 2016-04-18 19:57:26 +0200 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2016-04-21 19:34:23 +0200 |
| commit | 882416c1e4d1c9d4c7b50e0f5c3fa9ef043cd710 (patch) | |
| tree | eafa9c29e8e048e29a1a0240c023452088e5a738 /arch | |
| parent | drivers/perf: arm-pmu: fix RCU usage on pmu resume from low-power (diff) | |
| download | linux-882416c1e4d1c9d4c7b50e0f5c3fa9ef043cd710.tar.xz linux-882416c1e4d1c9d4c7b50e0f5c3fa9ef043cd710.zip | |
arm64: Fix EL1/EL2 early init inconsistencies with VHE
When using the Virtualisation Host Extensions, EL1 is not used in
the host and requires no separate configuration.
In addition, with VHE enabled, non-hyp-specific EL2 configuration
that does not need to be done early will be done anyway in
__cpu_setup via the _EL1 system register aliases. In particular,
the layout and definition of CPTR_EL2 are changed by enabling VHE
so that they resemble CPACR_EL1, so existing code to initialise
CPTR_EL2 becomes architecturally wrong in this case.
This patch simply skips the affected initialisation code in the
non-VHE case.
Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm64/kernel/head.S | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S index 80a709aa211a..85da0f599cd6 100644 --- a/arch/arm64/kernel/head.S +++ b/arch/arm64/kernel/head.S @@ -588,6 +588,15 @@ set_hcr: msr vpidr_el2, x0 msr vmpidr_el2, x1 + /* + * When VHE is not in use, early init of EL2 and EL1 needs to be + * done here. + * 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. + */ + cbnz x2, 1f + /* sctlr_el1 */ mov x0, #0x0800 // Set/clear RES{1,0} bits CPU_BE( movk x0, #0x33d0, lsl #16 ) // Set EE and E0E on BE systems @@ -597,6 +606,7 @@ CPU_LE( movk x0, #0x30d0, lsl #16 ) // Clear EE and E0E on LE systems /* Coprocessor traps. */ mov x0, #0x33ff msr cptr_el2, x0 // Disable copro. traps to EL2 +1: #ifdef CONFIG_COMPAT msr hstr_el2, xzr // Disable CP15 traps to EL2 |