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KVM: arm64: Don't hold 'vm_table_lock' across guest page reclaim

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Now that the teardown of a VM cannot be finalised as long as a reference
is held on the VM, rework __pkvm_reclaim_dying_guest_page() to hold a
reference to the dying VM rather than take the global 'vm_table_lock'
during the reclaim operation.

Signed-off-by: Will Deacon <will@kernel.org>
Link: https://patch.msgid.link/20260331155056.28220-4-will@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Will Deacon 2026-03-31 16:50:55 +01:00 committed by Marc Zyngier
parent 2400696883
commit bc20692f52
1 changed files with 7 additions and 6 deletions
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13
arch/arm64/kvm/hyp/nvhe/pkvm.c
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@ -918,15 +918,16 @@ teardown_donated_memory(struct kvm_hyp_memcache *mc, void *addr, size_t size)
int __pkvm_reclaim_dying_guest_page(pkvm_handle_t handle, u64 gfn)
{
struct pkvm_hyp_vm *hyp_vm;
struct pkvm_hyp_vm *hyp_vm = get_pkvm_hyp_vm(handle);
int ret = -EINVAL;
hyp_spin_lock(&vm_table_lock);
hyp_vm = get_vm_by_handle(handle);
if (hyp_vm && hyp_vm->kvm.arch.pkvm.is_dying)
ret = __pkvm_host_reclaim_page_guest(gfn, hyp_vm);
hyp_spin_unlock(&vm_table_lock);
if (!hyp_vm)
return ret;
if (hyp_vm->kvm.arch.pkvm.is_dying)
ret = __pkvm_host_reclaim_page_guest(gfn, hyp_vm);
put_pkvm_hyp_vm(hyp_vm);
return ret;
}