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ANDROID: KVM: iommu: Allow IOMMU mapping in carveouts

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Some carveouts might be no-map for the CPU, but can be used from
devices. Allow IOMMU to map those buffers.

Bug: 409547022
Bug: 357781595
Change-Id: Ie0e34442e59dc753afcb4357c85211aefe7d7b39
Signed-off-by: Mostafa Saleh <smostafa@google.com>
This commit is contained in:
Mostafa Saleh
2025-04-10 14:46:42 +00:00
parent 4089d8be3f
commit e680506fe0
1 changed files with 10 additions and 2 deletions
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12
arch/arm64/kvm/hyp/nvhe/mem_protect.c
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@@ -1898,8 +1898,16 @@ static int __pkvm_use_dma_locked(phys_addr_t phys_addr, size_t size,
} else {
/* For VMs, we know if we reach this point the VM has access to the page. */
if (!hyp_vcpu) {
ret = ___host_check_page_state_range(phys_addr, size,
PKVM_PAGE_OWNED, reg, false);
for (i = 0; i < nr_pages; i++) {
enum pkvm_page_state state;
phys_addr_t this_addr = phys_addr + i * PAGE_SIZE;
state = hyp_phys_to_page(this_addr)->host_state;
if (state != PKVM_PAGE_OWNED) {
ret = -EPERM;
break;
}
}
if (ret)
return ret;
}