Searched hist:e8b9a055fa0481679132781db574ecb771960f16 (Results 1 – 2 of 2) sorted by relevance
| /linux/tools/testing/selftests/kvm/lib/aarch64/ |
| H A D | processor.c | diff e8b9a055fa0481679132781db574ecb771960f16 Wed Dec 07 22:48:07 CET 2022 Oliver Upton <oliver.upton@linux.dev> KVM: arm64: selftests: Align VA space allocator with TTBR0
An interesting feature of the Arm architecture is that the stage-1 MMU
supports two distinct VA regions, controlled by TTBR{0,1}_EL1. As KVM
selftests on arm64 only uses TTBR0_EL1, the VA space is constrained to
[0, 2^(va_bits-1)). This is different from other architectures that
allow for addressing low and high regions of the VA space from a single
page table.
KVM selftests' VA space allocator presumes the valid address range is
split between low and high memory based the MSB, which of course is a
poor match for arm64's TTBR0 region.
Allow architectures to override the default VA space layout. Make use of
the override to align vpages_valid with the behavior of TTBR0 on arm64.
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Message-Id: <20221207214809.489070-4-oliver.upton@linux.dev>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
|
| /linux/tools/testing/selftests/kvm/lib/ |
| H A D | kvm_util.c | diff e8b9a055fa0481679132781db574ecb771960f16 Wed Dec 07 22:48:07 CET 2022 Oliver Upton <oliver.upton@linux.dev> KVM: arm64: selftests: Align VA space allocator with TTBR0
An interesting feature of the Arm architecture is that the stage-1 MMU
supports two distinct VA regions, controlled by TTBR{0,1}_EL1. As KVM
selftests on arm64 only uses TTBR0_EL1, the VA space is constrained to
[0, 2^(va_bits-1)). This is different from other architectures that
allow for addressing low and high regions of the VA space from a single
page table.
KVM selftests' VA space allocator presumes the valid address range is
split between low and high memory based the MSB, which of course is a
poor match for arm64's TTBR0 region.
Allow architectures to override the default VA space layout. Make use of
the override to align vpages_valid with the behavior of TTBR0 on arm64.
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Message-Id: <20221207214809.489070-4-oliver.upton@linux.dev>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
|