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KVM: arm64: Prevent re-finalisation of pKVM for a given CPU

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__pkvm_prot_finalize() completes the deprivilege of the host when pKVM
is in use by installing a stage-2 translation table for the calling CPU.

Issuing the hypercall multiple times for a given CPU makes little sense,
but in such a case just return early with -EPERM rather than go through
the whole page-table dance again.

Cc: Marc Zyngier <maz@kernel.org>
Cc: Quentin Perret <qperret@google.com>
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20211008135839.1193-6-will@kernel.org
This commit is contained in:
Will Deacon
2021-10-08 14:58:38 +01:00
committed by Marc Zyngier
parent 2f2e1a5069
commit 07036cffe1
1 changed files with 3 additions and 0 deletions
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3
arch/arm64/kvm/hyp/nvhe/mem_protect.c
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@@ -123,6 +123,9 @@ int __pkvm_prot_finalize(void)
struct kvm_s2_mmu *mmu = &host_kvm.arch.mmu;
struct kvm_nvhe_init_params *params = this_cpu_ptr(&kvm_init_params);
if (params->hcr_el2 & HCR_VM)
return -EPERM;
params->vttbr = kvm_get_vttbr(mmu);
params->vtcr = host_kvm.arch.vtcr;
params->hcr_el2 |= HCR_VM;