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KVM: arm64: selftests: Fix incorrect rounding in page_align()

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The implementation of `page_align()` in `processor.c` calculates
alignment incorrectly for values that are already aligned. Specifically,
`(v + vm->page_size) & ~(vm->page_size - 1)` aligns to the *next* page
boundary even if `v` is already page-aligned, potentially wasting a page
of memory.

Fix the calculation to use standard alignment logic: `(v + vm->page_size
- 1) & ~(vm->page_size - 1)`.

Fixes: 7a6629ef74 ("kvm: selftests: add virt mem support for aarch64")
Reviewed-by: Andrew Jones <andrew.jones@linux.dev>
Signed-off-by: Fuad Tabba <tabba@google.com>
Link: https://patch.msgid.link/20260109082218.3236580-3-tabba@google.com
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Fuad Tabba 2026-01-09 08:22:15 +00:00 committed by Marc Zyngier
parent 7e03d07d03
commit dd0c5d04d1
1 changed files with 1 additions and 1 deletions
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2
tools/testing/selftests/kvm/lib/arm64/processor.c
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@ -23,7 +23,7 @@ static vm_vaddr_t exception_handlers;
static uint64_t page_align(struct kvm_vm *vm, uint64_t v)
{
return (v + vm->page_size) & ~(vm->page_size - 1);
return (v + vm->page_size - 1) & ~(vm->page_size - 1);
}
static uint64_t pgd_index(struct kvm_vm *vm, vm_vaddr_t gva)