KVM: arm64: Ensure target address is granule-aligned for range TLBI

jira LE-1907
Rebuild_History Non-Buildable kernel-5.14.0-427.33.1.el9_4
commit-author Will Deacon <will@kernel.org>
commit 4c36a15

When zapping a table entry in stage2_try_break_pte(), we issue range
TLB invalidation for the region that was mapped by the table. However,
we neglect to align the base address down to the granule size and so
if we ended up reaching the table entry via a misaligned address then
we will accidentally skip invalidation for some prefix of the affected
address range.

Align 'ctx->addr' down to the granule size when performing TLB
invalidation for an unmapped table in stage2_try_break_pte().

	Cc: Raghavendra Rao Ananta <rananta@google.com>
	Cc: Gavin Shan <gshan@redhat.com>
	Cc: Shaoqin Huang <shahuang@redhat.com>
	Cc: Quentin Perret <qperret@google.com>
Fixes: defc8cc ("KVM: arm64: Invalidate the table entries upon a range")
	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/20240327124853.11206-5-will@kernel.org
	Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
(cherry picked from commit 4c36a15)
	Signed-off-by: Jonathan Maple <jmaple@ciq.com>

Author: PlaidCat

arch/arm64/kvm/hyp/pgtable.c

@@ -805,12 +805,15 @@ static bool stage2_try_break_pte(const struct kvm_pgtable_visit_ctx *ctx,
 		 * Perform the appropriate TLB invalidation based on the
 		 * evicted pte value (if any).
 		 */
-		if (kvm_pte_table(ctx->old, ctx->level))
-			kvm_tlb_flush_vmid_range(mmu, ctx->addr,
-						kvm_granule_size(ctx->level));
-		else if (kvm_pte_valid(ctx->old))
+		if (kvm_pte_table(ctx->old, ctx->level)) {
+			u64 size = kvm_granule_size(ctx->level);
+			u64 addr = ALIGN_DOWN(ctx->addr, size);
+
+			kvm_tlb_flush_vmid_range(mmu, addr, size);
+		} else if (kvm_pte_valid(ctx->old)) {
 			kvm_call_hyp(__kvm_tlb_flush_vmid_ipa, mmu,
 				     ctx->addr, ctx->level);
+		}
 	}
 
 	if (stage2_pte_is_counted(ctx->old))