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drivers/virt: pkvm: Fix end calculation in mmio_guard_ioremap_hook()

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Sashiko (locally) reports a logical issues in mmio_guard_ioremap_hook()

mmio_guard_ioremap_hook() attempts to handle unaligned addresses and
sizes. However, aligning the start address before adding the size, might
shift the end to the page before.

Fixes: 0f12694958 ("drivers/virt: pkvm: Intercept ioremap using pKVM MMIO_GUARD hypercall")
Signed-off-by: Mostafa Saleh <smostafa@google.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Tested-by: Aneesh Kumar K.V (Arm) <aneesh.kumar@kernel.org>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Mostafa Saleh 2026-06-03 11:05:21 +00:00 committed by Will Deacon
parent 26b483d524
commit 62c740f823
1 changed files with 1 additions and 1 deletions
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2
drivers/virt/coco/pkvm-guest/arm-pkvm-guest.c
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@ -82,8 +82,8 @@ static int mmio_guard_ioremap_hook(phys_addr_t phys, size_t size,
if (protval != PROT_DEVICE_nGnRE && protval != PROT_DEVICE_nGnRnE)
return 0;
end = PAGE_ALIGN(phys + size);
phys = PAGE_ALIGN_DOWN(phys);
end = phys + PAGE_ALIGN(size);
while (phys < end) {
const int func_id = ARM_SMCCC_VENDOR_HYP_KVM_MMIO_GUARD_FUNC_ID;