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arm64: mm: Introduce vabits_actual

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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>
This commit is contained in:
Steve Capper
2019-08-07 16:55:18 +01:00
committed by Will Deacon
parent 90ec95cda9
commit 5383cc6efe
8 changed files with 31 additions and 17 deletions
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4
arch/arm64/mm/fault.c
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@@ -138,9 +138,9 @@ static void show_pte(unsigned long addr)
return;
}
pr_alert("%s pgtable: %luk pages, %u-bit VAs, pgdp=%016lx\n",
pr_alert("%s pgtable: %luk pages, %llu-bit VAs, pgdp=%016lx\n",
mm == &init_mm ? "swapper" : "user", PAGE_SIZE / SZ_1K,
mm == &init_mm ? VA_BITS : (int)vabits_user,
mm == &init_mm ? vabits_actual : (int)vabits_user,
(unsigned long)virt_to_phys(mm->pgd));
pgdp = pgd_offset(mm, addr);
pgd = READ_ONCE(*pgdp);