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| author | Yury Norov <ynorov@caviumnetworks.com> | 2017-09-13 21:08:30 +0300 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2017-10-02 10:13:05 +0100 |
| commit | 9339fd348dd98ed64879a48dc7290cc3fa4e2911 (patch) | |
| tree | 81b122402ffd377fce1b5e2435b055fe2176bc4c /Documentation/arm64 | |
| parent | eef94a3d09aab437c8c254de942d8b1aa76455e2 (diff) | |
| download | op-kernel-dev-9339fd348dd98ed64879a48dc7290cc3fa4e2911.zip op-kernel-dev-9339fd348dd98ed64879a48dc7290cc3fa4e2911.tar.gz | |
arm64: fix documentation on kernel pages mappings to HYP VA
The Documentation/arm64/memory.txt says:
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):
In fact, kernel addresses are transleted to HYP with kern_hyp_va macro,
which has more options, and none of them assumes clearing of top 24bits
of the kernel VA.
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Yury Norov <ynorov@caviumnetworks.com>
[will: removed gory details]
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'Documentation/arm64')
| -rw-r--r-- | Documentation/arm64/memory.txt | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/Documentation/arm64/memory.txt b/Documentation/arm64/memory.txt index d7273a5..671bc06 100644 --- a/Documentation/arm64/memory.txt +++ b/Documentation/arm64/memory.txt @@ -86,9 +86,9 @@ Translation table lookup with 64KB pages: +-------------------------------------------------> [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): +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. -Start End Size Use ------------------------------------------------------------------------ -0000004000000000 0000007fffffffff 256GB kernel objects mapped in HYP +When using KVM with the Virtualization Host Extensions, no additional +mappings are created, since the host kernel runs directly in EL2. |
