From: Marc Zyngier Date: Thu, 2 May 2013 13:31:03 +0000 (+0100) Subject: arm64: KVM: document kernel object mappings in HYP X-Git-Tag: next-20130617~110^2^2 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=aa4a73a0;p=karo-tx-linux.git 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: Catalin Marinas Signed-off-by: Marc Zyngier --- diff --git a/Documentation/arm64/memory.txt b/Documentation/arm64/memory.txt index 5f583af0a6e1..78a377124ef0 100644 --- a/Documentation/arm64/memory.txt +++ b/Documentation/arm64/memory.txt @@ -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