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| author | Marc Zyngier <marc.zyngier@arm.com> | 2013-05-02 14:31:03 +0100 |
|---|---|---|
| committer | Marc Zyngier <marc.zyngier@arm.com> | 2013-06-12 16:42:20 +0100 |
| commit | aa4a73a0a23a65a2f531d01f1865d1e61c6acb55 (patch) | |
| tree | 1b93c50274f3f4c1729919ed697a4a7fe53b21b3 | |
| parent | 6394a3ec02ab39147aab9ea56d0dabafd3dcae60 (diff) | |
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 <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
| -rw-r--r-- | Documentation/arm64/memory.txt | 7 |
1 files changed, 7 insertions, 0 deletions
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 |