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arm64: Update the KVM memory map documentation

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Update the documentation to reflect the new tricks we play on the
EL2 mappings...

Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Marc Zyngier 2017-12-05 18:45:48 +00:00
parent ed57cac83e
commit 6bb934af1f
1 changed files with 5 additions and 3 deletions
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8
Documentation/arm64/memory.txt
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@ -86,9 +86,11 @@ Translation table lookup with 64KB pages:
+-------------------------------------------------> [63] TTBR0/1
When using KVM without the Virtualization Host Extensions, the hypervisor
maps kernel pages in EL2 at a fixed offset from the kernel VA. See the
kern_hyp_va macro for more details.
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.
When using KVM with the Virtualization Host Extensions, no additional
mappings are created, since the host kernel runs directly in EL2.