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arm64: KVM: document kernel object mappings in HYP

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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: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
(cherry picked from commit aa4a73a0a2)
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
This commit is contained in:
Marc Zyngier
2013-05-02 14:31:03 +01:00
committed by Christoffer Dall
parent 1a12f6e7bc
commit 092f9fbf38
1 changed files with 7 additions and 0 deletions
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7
Documentation/arm64/memory.txt
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@@ -102,3 +102,10 @@ 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