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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 <[email protected]>
Signed-off-by: Marc Zyngier <[email protected]>
This commit is contained in:
Marc Zyngier 2018-02-15 11:47:14 +00:00
commit dee39247dc
6 changed files with 95 additions and 12 deletions
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3
Documentation/arm64/memory.txt
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@ -90,7 +90,8 @@ When using KVM without the Virtualization Host Extensions, the
hypervisor maps kernel pages in EL2 at a fixed (and potentially
random) offset from the linear mapping. See the kern_hyp_va macro and
kvm_update_va_mask function for more details. MMIO devices such as
GICv2 gets mapped next to the HYP idmap page.
GICv2 gets mapped next to the HYP idmap page, as do vectors when
ARM64_HARDEN_EL2_VECTORS is selected for particular CPUs.
When using KVM with the Virtualization Host Extensions, no additional
mappings are created, since the host kernel runs directly in EL2.