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ANDROID: KVM: arm64: Check for existing pinned_pages before THP in pkvm_mem_abort

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With the later introduction of the SPLIT request, we can expect to have
a level-3 mapping on the stage-2 where a level-2 is installed for the
stage-1. Also, part of the stage-2 might have been unmapped already. So
check for existing stage-2 mappings before checking for the stage-1
(transparent_hugepage_adjust()).

Bug: 419548963
Bug: 357781595
Bug: 278011447
Change-Id: Iff7755ff6a82fa080c3a04efe1e689bc0500a3c9
Signed-off-by: Vincent Donnefort <vdonnefort@google.com>
This commit is contained in:
Vincent Donnefort
2025-05-26 10:21:38 +01:00
parent 2e30f9c5c2
commit 2846906d1e
1 changed files with 9 additions and 4 deletions
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13
arch/arm64/kvm/mmu.c
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@@ -1730,9 +1730,8 @@ __pkvm_pages_to_ppages(struct kvm *kvm, struct kvm_memory_slot *memslot, gfn_t g
read_lock(&kvm->mmu_lock);
while (p < nr_pages) {
phys_addr_t ipa = gfn << PAGE_SHIFT;
long skip, page_size = PAGE_SIZE;
struct page *page = pages[p];
long page_size, skip;
unsigned long hva;
u64 pfn;
ppage = kvm_pinned_pages_iter_first(&kvm->arch.pkvm.pinned_pages,
@@ -1743,8 +1742,14 @@ __pkvm_pages_to_ppages(struct kvm *kvm, struct kvm_memory_slot *memslot, gfn_t g
}
pfn = page_to_pfn(page);
hva = gfn_to_hva_memslot_prot(memslot, gfn, NULL);
page_size = transparent_hugepage_adjust(kvm, memslot, hva, &pfn, &ipa);
if (!kvm_pinned_pages_iter_first(&kvm->arch.pkvm.pinned_pages,
ALIGN_DOWN(ipa, PMD_SIZE),
ALIGN(ipa + 1, PMD_SIZE) - 1)){
unsigned long hva = gfn_to_hva_memslot_prot(memslot, gfn, NULL);
page_size = transparent_hugepage_adjust(kvm, memslot, hva, &pfn, &ipa);
}
/* Pop a ppage from the pre-allocated list */
ppage = list_first_entry(&ppage_prealloc, struct kvm_pinned_page, list_node);