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authorYury Norov <ynorov@caviumnetworks.com>2017-09-13 20:08:30 +0200
committerWill Deacon <will.deacon@arm.com>2017-10-02 11:13:05 +0200
commit9339fd348dd98ed64879a48dc7290cc3fa4e2911 (patch)
tree81b122402ffd377fce1b5e2435b055fe2176bc4c /Documentation/arm64/memory.txt
parentarm64: move TASK_* definitions to <asm/processor.h> (diff)
downloadlinux-9339fd348dd98ed64879a48dc7290cc3fa4e2911.tar.xz
linux-9339fd348dd98ed64879a48dc7290cc3fa4e2911.zip
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/memory.txt')
-rw-r--r--Documentation/arm64/memory.txt10
1 files changed, 5 insertions, 5 deletions
diff --git a/Documentation/arm64/memory.txt b/Documentation/arm64/memory.txt
index d7273a5f6456..671bc0639262 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.