commit 36e008323926036650299cfbb2dca704c7aba849 upstream.
The TLBI level hints are for leaf entries only, so take care not to pass
them incorrectly after clearing a table entry.
Cc: Gavin Shan <gshan@xxxxxxxxxx>
Cc: Marc Zyngier <maz@xxxxxxxxxx>
Cc: Quentin Perret <qperret@xxxxxxxxxx>
Fixes: 82bb02445de5 ("KVM: arm64: Implement kvm_pgtable_hyp_unmap() at EL2")
Fixes: 6d9d2115c480 ("KVM: arm64: Add support for stage-2 map()/unmap() in generic page-table")
Reviewed-by: Shaoqin Huang <shahuang@xxxxxxxxxx>
Reviewed-by: Marc Zyngier <maz@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20240327124853.11206-3-will@xxxxxxxxxx
Signed-off-by: Oliver Upton <oliver.upton@xxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # 6.1.y only
[will@: Use '0' instead of TLBI_TTL_UNKNOWN_to indicate "no level". Force
level to 0 in stage2_put_pte() if we're clearing a table entry.]
Signed-off-by: Will Deacon <will@xxxxxxxxxx>
---
arch/arm64/kvm/hyp/pgtable.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c
index ae5f6b5ac80f..f0167dc7438f 100644
--- a/arch/arm64/kvm/hyp/pgtable.c
+++ b/arch/arm64/kvm/hyp/pgtable.c
@@ -475,7 +475,7 @@ static int hyp_unmap_walker(u64 addr, u64 end, u32 level, kvm_pte_t *ptep,
kvm_clear_pte(ptep);
dsb(ishst);
- __tlbi_level(vae2is, __TLBI_VADDR(addr, 0), level);
+ __tlbi_level(vae2is, __TLBI_VADDR(addr, 0), 0);
} else {
if (end - addr < granule)
return -EINVAL;
@@ -699,8 +699,14 @@ static void stage2_put_pte(kvm_pte_t *ptep, struct kvm_s2_mmu *mmu, u64 addr,
* Clear the existing PTE, and perform break-before-make with
* TLB maintenance if it was valid.
*/
- if (kvm_pte_valid(*ptep)) {
+ kvm_pte_t pte = *ptep;
+
+ if (kvm_pte_valid(pte)) {
kvm_clear_pte(ptep);
+
+ if (kvm_pte_table(pte, level))
+ level = 0;
+
kvm_call_hyp(__kvm_tlb_flush_vmid_ipa, mmu, addr, level);
}
--
2.46.0.184.g6999bdac58-goog
