Patch "KVM: arm64: Don't pass a TLBI level hint when zapping table entries" has been added to the 6.6-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    KVM: arm64: Don't pass a TLBI level hint when zapping table entries

to the 6.6-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     kvm-arm64-don-t-pass-a-tlbi-level-hint-when-zapping-table-entries.patch
and it can be found in the queue-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


From stable+bounces-67768-greg=kroah.com@vger.kernel.org Thu Aug 15 14:49:11 2024
From: Will Deacon <will@kernel.org>
Date: Thu, 15 Aug 2024 13:46:26 +0100
Subject: KVM: arm64: Don't pass a TLBI level hint when zapping table entries
To: stable@vger.kernel.org
Cc: Will Deacon <will@kernel.org>, Marc Zyngier <maz@kernel.org>, Oliver Upton <oliver.upton@linux.dev>, kvmarm@lists.linux.dev, Gavin Shan <gshan@redhat.com>, Quentin Perret <qperret@google.com>, Shaoqin Huang <shahuang@redhat.com>
Message-ID: <20240815124626.21674-3-will@kernel.org>

From: Will Deacon <will@kernel.org>

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@redhat.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Quentin Perret <qperret@google.com>
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")
Signed-off-by: Will Deacon <will@kernel.org>
Reviewed-by: Shaoqin Huang <shahuang@redhat.com>
Reviewed-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20240327124853.11206-3-will@kernel.org
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Cc: <stable@vger.kernel.org> # 6.6.y only
[will@: Use '0' instead of TLBI_TTL_UNKNOWN to indicate "no level"]
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 arch/arm64/kvm/hyp/pgtable.c |   12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

--- a/arch/arm64/kvm/hyp/pgtable.c
+++ b/arch/arm64/kvm/hyp/pgtable.c
@@ -523,7 +523,7 @@ static int hyp_unmap_walker(const struct
 
 		kvm_clear_pte(ctx->ptep);
 		dsb(ishst);
-		__tlbi_level(vae2is, __TLBI_VADDR(ctx->addr, 0), ctx->level);
+		__tlbi_level(vae2is, __TLBI_VADDR(ctx->addr, 0), 0);
 	} else {
 		if (ctx->end - ctx->addr < granule)
 			return -EINVAL;
@@ -861,10 +861,12 @@ static void stage2_unmap_put_pte(const s
 	if (kvm_pte_valid(ctx->old)) {
 		kvm_clear_pte(ctx->ptep);
 
-		if (!stage2_unmap_defer_tlb_flush(pgt) ||
-		    kvm_pte_table(ctx->old, ctx->level)) {
-			kvm_call_hyp(__kvm_tlb_flush_vmid_ipa, mmu,
-					ctx->addr, ctx->level);
+		if (kvm_pte_table(ctx->old, ctx->level)) {
+			kvm_call_hyp(__kvm_tlb_flush_vmid_ipa, mmu, ctx->addr,
+				     0);
+		} else if (!stage2_unmap_defer_tlb_flush(pgt)) {
+			kvm_call_hyp(__kvm_tlb_flush_vmid_ipa, mmu, ctx->addr,
+				     ctx->level);
 		}
 	}
 


Patches currently in stable-queue which might be from will@kernel.org are

queue-6.6/kvm-arm64-don-t-defer-tlb-invalidation-when-zapping-table-entries.patch
queue-6.6/kvm-arm64-don-t-pass-a-tlbi-level-hint-when-zapping-table-entries.patch