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ANDROID: KVM: arm64: Disable relinquish for p-guest huge-mappings

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Memory relinquish with huge stage-2 mappings is currently utterly borken
as we can't page-fault a half reclaimed huge mapping. Prevent it until
it is fixed.

Bug: 419548963
Bug: 357781595
Bug: 278011447
Change-Id: I7256042ed8392997dc488199c494cb9984270e24
Signed-off-by: Vincent Donnefort <vdonnefort@google.com>
This commit is contained in:
Vincent Donnefort
2025-03-13 17:00:02 +00:00
parent 56ad021f7a
commit 2e30f9c5c2
1 changed files with 4 additions and 0 deletions
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4
arch/arm64/kvm/hyp/nvhe/mem_protect.c
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@@ -410,6 +410,10 @@ int __pkvm_guest_relinquish_to_host(struct pkvm_hyp_vcpu *vcpu,
if (ret || !kvm_pte_valid(pte))
goto end;
/* We don't support splitting non-leaf mappings */
if (level != KVM_PGTABLE_LAST_LEVEL)
goto end;
state = guest_get_page_state(pte, ipa);
if (state != PKVM_PAGE_OWNED) {
ret = -EPERM;