Received-SPF: pass (google.com: domain of linux-kernel+bounces-63209-linux.lists.archive=gmail.com@vger.kernel.org designates 147.75.199.223 as permitted sender) client-ip=147.75.199.223;
From: Oliver Upton <oliver.upton@linux.dev>
To: kvmarm@lists.linux.dev
Cc: kvm@vger.kernel.org,
	Marc Zyngier <maz@kernel.org>,
	James Morse <james.morse@arm.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Zenghui Yu <yuzenghui@huawei.com>,
	linux-kernel@vger.kernel.org,
	Oliver Upton <oliver.upton@linux.dev>
Subject: [PATCH v2 04/23] KVM: arm64: vgic-v3: Iterate the xarray to find pending LPIs
Date: Tue, 13 Feb 2024 09:32:41 +0000
Message-ID: <20240213093250.3960069-5-oliver.upton@linux.dev>
In-Reply-To: <20240213093250.3960069-1-oliver.upton@linux.dev>
References: <20240213093250.3960069-1-oliver.upton@linux.dev>
Precedence: bulk
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit

Start walking the LPI xarray to find pending LPIs in preparation for
the removal of the LPI linked-list. Note that the 'basic' iterator
is chosen here as each iteration needs to drop the xarray read lock
(RCU) as reads/writes to guest memory can potentially block.

Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
---
 arch/arm64/kvm/vgic/vgic-v3.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/kvm/vgic/vgic-v3.c b/arch/arm64/kvm/vgic/vgic-v3.c
index 9465d3706ab9..4ea3340786b9 100644
--- a/arch/arm64/kvm/vgic/vgic-v3.c
+++ b/arch/arm64/kvm/vgic/vgic-v3.c
@@ -380,6 +380,7 @@ int vgic_v3_save_pending_tables(struct kvm *kvm)
 	struct vgic_irq *irq;
 	gpa_t last_ptr = ~(gpa_t)0;
 	bool vlpi_avail = false;
+	unsigned long index;
 	int ret = 0;
 	u8 val;
 
@@ -396,7 +397,7 @@ int vgic_v3_save_pending_tables(struct kvm *kvm)
 		vlpi_avail = true;
 	}
 
-	list_for_each_entry(irq, &dist->lpi_list_head, lpi_list) {
+	xa_for_each(&dist->lpi_xa, index, irq) {
 		int byte_offset, bit_nr;
 		struct kvm_vcpu *vcpu;
 		gpa_t pendbase, ptr;
-- 
2.43.0.687.g38aa6559b0-goog