* [PATCH 1/2] KVM: arm64: Ensure level is always initialized when relaxing perms
[not found] <20260701231620.3300204-1-oupton@kernel.org>
@ 2026-07-01 23:16 ` Oliver Upton
0 siblings, 0 replies; only message in thread
From: Oliver Upton @ 2026-07-01 23:16 UTC (permalink / raw)
To: kvmarm
Cc: Marc Zyngier, Joey Gouly, Suzuki K Poulose, Zenghui Yu,
Wei-Lin Chang, Steffen Eiden, Oliver Upton, stable
stage2_update_leaf_attrs() returns early before writing to @level if the
table walker returned an error. At the same time,
kvm_pgtable_stage2_relax_perms() uses the level as a TLBI TTL hint when the
error was EAGAIN, indicating the vCPU raced with a table update and the TLB
entry it hit is now stale.
Fall back to an unknown TTL if none was provided by the walk.
Cc: stable@vger.kernel.org
Fixes: be097997a273 ("KVM: arm64: Always invalidate TLB for stage-2 permission faults")
Signed-off-by: Oliver Upton <oupton@kernel.org>
---
arch/arm64/kvm/hyp/pgtable.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c
index 91a7dfad6686..31aaca35693a 100644
--- a/arch/arm64/kvm/hyp/pgtable.c
+++ b/arch/arm64/kvm/hyp/pgtable.c
@@ -1358,7 +1358,7 @@ int kvm_pgtable_stage2_relax_perms(struct kvm_pgtable *pgt, u64 addr,
enum kvm_pgtable_prot prot, enum kvm_pgtable_walk_flags flags)
{
kvm_pte_t xn = 0, set = 0, clr = 0;
- s8 level;
+ s8 level = TLBI_TTL_UNKNOWN;
int ret;
if (prot & KVM_PTE_LEAF_ATTR_HI_SW)
--
2.47.3
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