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KVM: selftests: arm64: Introduce a variable default IPA size

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Contrary to popular belief, there is no such thing as a default
IPA size on arm64. Anything goes, and implementations are the
usual Wild West.

The selftest infrastructure default to 40bit IPA, which obviously
doesn't work for some systems out there.

Turn VM_MODE_DEFAULT from a constant into a variable, and let
guest_modes_append_default() populate it, depending on what
the HW can do. In order to preserve the current behaviour, we
still pick 40bits IPA as the default if it is available, and
the largest supported IPA space otherwise.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Link: https://lore.kernel.org/r/20211227124809.1335409-3-maz@kernel.org
This commit is contained in:
Marc Zyngier
2021-12-27 12:48:05 +00:00
parent cb7c4f364a
commit 357c628e12
2 changed files with 30 additions and 4 deletions
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4
tools/testing/selftests/kvm/include/kvm_util.h
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@@ -53,7 +53,9 @@ enum vm_guest_mode {
#if defined(__aarch64__)
#define VM_MODE_DEFAULT VM_MODE_P40V48_4K
extern enum vm_guest_mode vm_mode_default;
#define VM_MODE_DEFAULT vm_mode_default
#define MIN_PAGE_SHIFT 12U
#define ptes_per_page(page_size) ((page_size) / 8)