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arm64: KVM: Allow mapping of vectors outside of the RAM region

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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>
This commit is contained in:
Marc Zyngier
2018-02-15 11:47:14 +00:00
parent 4205a89b80
commit dee39247dc
6 changed files with 96 additions and 13 deletions
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5
arch/arm64/include/asm/mmu.h
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@@ -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)