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| author | Marc Zyngier <marc.zyngier@arm.com> | 2018-02-15 11:47:14 +0000 |
|---|---|---|
| committer | Marc Zyngier <marc.zyngier@arm.com> | 2018-03-19 13:06:46 +0000 |
| commit | dee39247dc75465a24990cb1772c6aaced5fd910 (patch) | |
| tree | fb6f241d24eaee60ad33127a318521dccae02661 /arch/arm64/include/asm/mmu.h | |
| parent | 4205a89b8060141ac0216a507b9f70728f056a10 (diff) | |
| download | lwn-dee39247dc75465a24990cb1772c6aaced5fd910.tar.gz lwn-dee39247dc75465a24990cb1772c6aaced5fd910.zip | |
arm64: KVM: Allow mapping of vectors outside of the RAM region
We're now ready to map our vectors in weird and wonderful locations.
On enabling ARM64_HARDEN_EL2_VECTORS, a vector slot gets allocated
if this hasn't been already done via ARM64_HARDEN_BRANCH_PREDICTOR
and gets mapped outside of the normal RAM region, next to the
idmap.
That way, being able to obtain VBAR_EL2 doesn't reveal the mapping
of the rest of the hypervisor code.
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'arch/arm64/include/asm/mmu.h')
| -rw-r--r-- | arch/arm64/include/asm/mmu.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/arm64/include/asm/mmu.h b/arch/arm64/include/asm/mmu.h index 3baf010fe883..dd320df0d026 100644 --- a/arch/arm64/include/asm/mmu.h +++ b/arch/arm64/include/asm/mmu.h @@ -51,10 +51,13 @@ struct bp_hardening_data { bp_hardening_cb_t fn; }; -#ifdef CONFIG_HARDEN_BRANCH_PREDICTOR +#if (defined(CONFIG_HARDEN_BRANCH_PREDICTOR) || \ + defined(CONFIG_HARDEN_EL2_VECTORS)) extern char __bp_harden_hyp_vecs_start[], __bp_harden_hyp_vecs_end[]; extern atomic_t arm64_el2_vector_last_slot; +#endif /* CONFIG_HARDEN_BRANCH_PREDICTOR || CONFIG_HARDEN_EL2_VECTORS */ +#ifdef CONFIG_HARDEN_BRANCH_PREDICTOR DECLARE_PER_CPU_READ_MOSTLY(struct bp_hardening_data, bp_hardening_data); static inline struct bp_hardening_data *arm64_get_bp_hardening_data(void) |