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Commit aa4a73a0 authored by Marc Zyngier's avatar Marc Zyngier
Browse files

arm64: KVM: document kernel object mappings in HYP 



HYP mode has access to some of the kernel pages. Document the
memory mapping and the offset between kernel VA and HYP VA.

Reviewed-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
parent 6394a3ec

Documentation/arm64/memory.txt

+7 −0
Original line number Diff line number Diff line
@@ -73,3 +73,10 @@ Translation table lookup with 64KB pages: 
 |                 |    +--------------------------> [41:29] L2 index (only 38:29 used)

 |                 +-------------------------------> [47:42] L1 index (not used)

 +-------------------------------------------------> [63] TTBR0/1



When using KVM, the hypervisor maps kernel pages in EL2, at a fixed

offset from the kernel VA (top 24bits of the kernel VA set to zero):



Start			End			Size		Use

-----------------------------------------------------------------------

0000004000000000	0000007fffffffff	 256GB		kernel objects mapped in HYP