[PATCH] KVM: arm64: nv: Skip vCPUs without a pseudo-TLB in invalidate_vncr_va()

[Hyunwoo Kim <imv4bel@gmail.com>]

vncr_tlb is not allocated before a vCPU runs for the first time, so
vcpu->arch.vncr_tlb is NULL for a vCPU that has been created but not yet
run. Code that iterates over every vCPU's pseudo-TLB must skip those.

invalidate_vncr_va() iterates over the vCPUs with kvm_for_each_vcpu() and
dereferences vt->valid without checking whether vncr_tlb is NULL.

While iterating, skip vCPUs whose pseudo-TLB has not been allocated.

Fixes: 4ffa72ad8f37 ("KVM: arm64: nv: Add S1 TLB invalidation primitive for VNCR_EL2")
Signed-off-by: Hyunwoo Kim <imv4bel@gmail.com>
---
 arch/arm64/kvm/nested.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm64/kvm/nested.c b/arch/arm64/kvm/nested.c
index 6f7bc9a9992e..063e079d1d1a 100644
--- a/arch/arm64/kvm/nested.c
+++ b/arch/arm64/kvm/nested.c
@@ -969,6 +969,10 @@ static void invalidate_vncr_va(struct kvm *kvm,
 		struct vncr_tlb *vt = vcpu->arch.vncr_tlb;
 		u64 va_start, va_end, va_size;
 
+		/* Skip vCPUs whose pseudo-TLB hasn't been allocated yet */
+		if (!vt)
+			continue;
+
 		if (!vt->valid)
 			continue;
 
-- 
2.43.0