]> git.baikalelectronics.ru Git - kernel.git/commit
arm64: allow ID map to be extended to 52 bits
authorKristina Martsenko <kristina.martsenko@arm.com>
Wed, 13 Dec 2017 17:07:24 +0000 (17:07 +0000)
committerCatalin Marinas <catalin.marinas@arm.com>
Fri, 22 Dec 2017 17:37:33 +0000 (17:37 +0000)
commit7fb9acd4d8f51816612d309590d9f976e3284f5b
tree61ab6a749b01e7ad21b5a96ecf1be2011bc13223
parenta28271de320a49871c000ca81b6035ea1134722a
arm64: allow ID map to be extended to 52 bits

Currently, when using VA_BITS < 48, if the ID map text happens to be
placed in physical memory above VA_BITS, we increase the VA size (up to
48) and create a new table level, in order to map in the ID map text.
This is okay because the system always supports 48 bits of VA.

This patch extends the code such that if the system supports 52 bits of
VA, and the ID map text is placed that high up, then we increase the VA
size accordingly, up to 52.

One difference from the current implementation is that so far the
condition of VA_BITS < 48 has meant that the top level table is always
"full", with the maximum number of entries, and an extra table level is
always needed. Now, when VA_BITS = 48 (and using 64k pages), the top
level table is not full, and we simply need to increase the number of
entries in it, instead of creating a new table level.

Tested-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Tested-by: Bob Picco <bob.picco@oracle.com>
Reviewed-by: Bob Picco <bob.picco@oracle.com>
Signed-off-by: Kristina Martsenko <kristina.martsenko@arm.com>
[catalin.marinas@arm.com: reduce arguments to __create_hyp_mappings()]
[catalin.marinas@arm.com: reworked/renamed __cpu_uses_extended_idmap_level()]
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
arch/arm/include/asm/kvm_mmu.h
arch/arm64/include/asm/assembler.h
arch/arm64/include/asm/kvm_mmu.h
arch/arm64/include/asm/mmu_context.h
arch/arm64/kernel/head.S
arch/arm64/kvm/hyp-init.S
arch/arm64/mm/mmu.c
virt/kvm/arm/mmu.c