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ANDROID: KVM: arm64: Use unmap for pKVM guests memory relinquish

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Previously, annotate was used when a guest relinquishes memory. The
intension was to allow splitting an existing block. However we are
moving away from this mechanism (which came with a list of serious
issues). Relinquish will now on only happen on level-3 mappings and
therefore we can restore the unmap.

Bug: 419518210
Bug: 419548963
Bug: 278011447
Change-Id: I4e7d2af3683cf2b189b1580f39d543d83cac644f
Signed-off-by: Vincent Donnefort <vdonnefort@google.com>
This commit is contained in:
Vincent Donnefort
2025-05-23 13:43:17 +01:00
parent 7c95a219c0
commit 297e1ff805
1 changed files with 1 additions and 2 deletions
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3
arch/arm64/kvm/hyp/nvhe/mem_protect.c
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@@ -437,8 +437,7 @@ int __pkvm_guest_relinquish_to_host(struct pkvm_hyp_vcpu *vcpu,
goto end;
/* Zap the guest stage2 pte and return ownership to the host */
ret = kvm_pgtable_stage2_annotate(&vm->pgt, ipa, PAGE_SIZE,
&vcpu->vcpu.arch.stage2_mc, 0);
ret = kvm_pgtable_stage2_unmap(&vm->pgt, ipa, PAGE_SIZE);
if (ret)
goto end;