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| author | Marc Zyngier <marc.zyngier@arm.com> | 2017-12-05 18:45:48 +0000 |
|---|---|---|
| committer | Marc Zyngier <marc.zyngier@arm.com> | 2018-03-19 13:05:31 +0000 |
| commit | 6bb934af1f737eba51e2f3f73760715788a7e283 (patch) | |
| tree | 702b1a054a3a9c76f07c55251b0c496484f3f004 /Documentation/arm64 | |
| parent | ed57cac83e05f2e93567e4b5c57ee58a1bf8a582 (diff) | |
| download | linux-stable-6bb934af1f737eba51e2f3f73760715788a7e283.tar.gz linux-stable-6bb934af1f737eba51e2f3f73760715788a7e283.tar.bz2 linux-stable-6bb934af1f737eba51e2f3f73760715788a7e283.zip | |
arm64: Update the KVM memory map documentation
Update the documentation to reflect the new tricks we play on the
EL2 mappings...
Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'Documentation/arm64')
| -rw-r--r-- | Documentation/arm64/memory.txt | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/Documentation/arm64/memory.txt b/Documentation/arm64/memory.txt index 671bc0639262..c58cc5dbe667 100644 --- a/Documentation/arm64/memory.txt +++ b/Documentation/arm64/memory.txt @@ -86,9 +86,11 @@ Translation table lookup with 64KB pages: +-------------------------------------------------> [63] TTBR0/1 -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. +When using KVM without the Virtualization Host Extensions, the +hypervisor maps kernel pages in EL2 at a fixed (and potentially +random) offset from the linear mapping. See the kern_hyp_va macro and +kvm_update_va_mask function for more details. MMIO devices such as +GICv2 gets mapped next to the HYP idmap page. When using KVM with the Virtualization Host Extensions, no additional mappings are created, since the host kernel runs directly in EL2. |