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Commit 6bb934af authored by Marc Zyngier's avatar Marc Zyngier
Browse files

arm64: Update the KVM memory map documentation 



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

Acked-by: default avatarChristoffer Dall <christoffer.dall@linaro.org>
Acked-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
parent ed57cac8

Documentation/arm64/memory.txt

+5 −3
Original line number Diff line number Diff line
@@ -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.