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authorSteve Capper <steve.capper@arm.com>2019-08-07 16:55:18 +0100
committerWill Deacon <will@kernel.org>2019-08-09 11:17:21 +0100
commit5383cc6efed13784ddb3cff2cc183b6b8c50c8db (patch)
treee6a050f886096231108a344f6cad53bfa362d169 /arch/arm64/kernel
parent90ec95cda91a021d82351c976896a63aa364ebf1 (diff)
downloadlinux-5383cc6efed13784ddb3cff2cc183b6b8c50c8db.tar.bz2
arm64: mm: Introduce vabits_actual
In order to support 52-bit kernel addresses detectable at boot time, one needs to know the actual VA_BITS detected. A new variable vabits_actual is introduced in this commit and employed for the KVM hypervisor layout, KASAN, fault handling and phys-to/from-virt translation where there would normally be compile time constants. In order to maintain performance in phys_to_virt, another variable physvirt_offset is introduced. Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Steve Capper <steve.capper@arm.com> Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'arch/arm64/kernel')
-rw-r--r--arch/arm64/kernel/head.S5
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S
index ac58c69993ec..6dc7349868d9 100644
--- a/arch/arm64/kernel/head.S
+++ b/arch/arm64/kernel/head.S
@@ -321,6 +321,11 @@ __create_page_tables:
dmb sy
dc ivac, x6 // Invalidate potentially stale cache line
+ adr_l x6, vabits_actual
+ str x5, [x6]
+ dmb sy
+ dc ivac, x6 // Invalidate potentially stale cache line
+
/*
* VA_BITS may be too small to allow for an ID mapping to be created
* that covers system RAM if that is located sufficiently high in the