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From: Marc Zyngier <maz@kernel.org>
To: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org,
	kvm@vger.kernel.org
Cc: James Morse <james.morse@arm.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Oliver Upton <oliver.upton@linux.dev>,
	Zenghui Yu <yuzenghui@huawei.com>,
	Joey Gouly <joey.gouly@arm.com>,
	Shameerali Kolothum Thodi <shameerali.kolothum.thodi@huawei.com>,
	Xu Zhao <zhaoxu.35@bytedance.com>,
	Eric Auger <eric.auger@redhat.com>
Subject: [PATCH v3 02/11] KVM: arm64: vgic-its: Treat the collection target address as a vcpu_id
Date: Wed, 27 Sep 2023 10:09:02 +0100	[thread overview]
Message-ID: <20230927090911.3355209-3-maz@kernel.org> (raw)
In-Reply-To: <20230927090911.3355209-1-maz@kernel.org>

Since our emulated ITS advertises GITS_TYPER.PTA=0, the target
address associated to a collection is a PE number and not
an address. So far, so good. However, the PE number is what userspace
has provided given us (aka the vcpu_id), and not the internal vcpu
index.

Make sure we consistently retrieve the vcpu by ID rather than
by index, adding a helper that deals with most of the cases.

We also get rid of the pointless (and bogus) comparisons to
online_vcpus, which don't really make sense.

Reviewed-by: Zenghui Yu <yuzenghui@huawei.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 arch/arm64/kvm/vgic/vgic-its.c | 49 +++++++++++++++++++---------------
 1 file changed, 27 insertions(+), 22 deletions(-)

diff --git a/arch/arm64/kvm/vgic/vgic-its.c b/arch/arm64/kvm/vgic/vgic-its.c
index 5fe2365a629f..2dad2d095160 100644
--- a/arch/arm64/kvm/vgic/vgic-its.c
+++ b/arch/arm64/kvm/vgic/vgic-its.c
@@ -378,6 +378,12 @@ static int update_affinity(struct vgic_irq *irq, struct kvm_vcpu *vcpu)
 	return ret;
 }
 
+static struct kvm_vcpu *collection_to_vcpu(struct kvm *kvm,
+					   struct its_collection *col)
+{
+	return kvm_get_vcpu_by_id(kvm, col->target_addr);
+}
+
 /*
  * Promotes the ITS view of affinity of an ITTE (which redistributor this LPI
  * is targeting) to the VGIC's view, which deals with target VCPUs.
@@ -391,7 +397,7 @@ static void update_affinity_ite(struct kvm *kvm, struct its_ite *ite)
 	if (!its_is_collection_mapped(ite->collection))
 		return;
 
-	vcpu = kvm_get_vcpu(kvm, ite->collection->target_addr);
+	vcpu = collection_to_vcpu(kvm, ite->collection);
 	update_affinity(ite->irq, vcpu);
 }
 
@@ -679,7 +685,7 @@ int vgic_its_resolve_lpi(struct kvm *kvm, struct vgic_its *its,
 	if (!ite || !its_is_collection_mapped(ite->collection))
 		return E_ITS_INT_UNMAPPED_INTERRUPT;
 
-	vcpu = kvm_get_vcpu(kvm, ite->collection->target_addr);
+	vcpu = collection_to_vcpu(kvm, ite->collection);
 	if (!vcpu)
 		return E_ITS_INT_UNMAPPED_INTERRUPT;
 
@@ -887,7 +893,7 @@ static int vgic_its_cmd_handle_movi(struct kvm *kvm, struct vgic_its *its,
 		return E_ITS_MOVI_UNMAPPED_COLLECTION;
 
 	ite->collection = collection;
-	vcpu = kvm_get_vcpu(kvm, collection->target_addr);
+	vcpu = collection_to_vcpu(kvm, collection);
 
 	vgic_its_invalidate_cache(kvm);
 
@@ -1121,7 +1127,7 @@ static int vgic_its_cmd_handle_mapi(struct kvm *kvm, struct vgic_its *its,
 	}
 
 	if (its_is_collection_mapped(collection))
-		vcpu = kvm_get_vcpu(kvm, collection->target_addr);
+		vcpu = collection_to_vcpu(kvm, collection);
 
 	irq = vgic_add_lpi(kvm, lpi_nr, vcpu);
 	if (IS_ERR(irq)) {
@@ -1242,21 +1248,22 @@ static int vgic_its_cmd_handle_mapc(struct kvm *kvm, struct vgic_its *its,
 				    u64 *its_cmd)
 {
 	u16 coll_id;
-	u32 target_addr;
 	struct its_collection *collection;
 	bool valid;
 
 	valid = its_cmd_get_validbit(its_cmd);
 	coll_id = its_cmd_get_collection(its_cmd);
-	target_addr = its_cmd_get_target_addr(its_cmd);
-
-	if (target_addr >= atomic_read(&kvm->online_vcpus))
-		return E_ITS_MAPC_PROCNUM_OOR;
 
 	if (!valid) {
 		vgic_its_free_collection(its, coll_id);
 		vgic_its_invalidate_cache(kvm);
 	} else {
+		struct kvm_vcpu *vcpu;
+
+		vcpu = kvm_get_vcpu_by_id(kvm, its_cmd_get_target_addr(its_cmd));
+		if (!vcpu)
+			return E_ITS_MAPC_PROCNUM_OOR;
+
 		collection = find_collection(its, coll_id);
 
 		if (!collection) {
@@ -1270,9 +1277,9 @@ static int vgic_its_cmd_handle_mapc(struct kvm *kvm, struct vgic_its *its,
 							coll_id);
 			if (ret)
 				return ret;
-			collection->target_addr = target_addr;
+			collection->target_addr = vcpu->vcpu_id;
 		} else {
-			collection->target_addr = target_addr;
+			collection->target_addr = vcpu->vcpu_id;
 			update_affinity_collection(kvm, its, collection);
 		}
 	}
@@ -1382,7 +1389,7 @@ static int vgic_its_cmd_handle_invall(struct kvm *kvm, struct vgic_its *its,
 	if (!its_is_collection_mapped(collection))
 		return E_ITS_INVALL_UNMAPPED_COLLECTION;
 
-	vcpu = kvm_get_vcpu(kvm, collection->target_addr);
+	vcpu = collection_to_vcpu(kvm, collection);
 	vgic_its_invall(vcpu);
 
 	return 0;
@@ -1399,23 +1406,21 @@ static int vgic_its_cmd_handle_invall(struct kvm *kvm, struct vgic_its *its,
 static int vgic_its_cmd_handle_movall(struct kvm *kvm, struct vgic_its *its,
 				      u64 *its_cmd)
 {
-	u32 target1_addr = its_cmd_get_target_addr(its_cmd);
-	u32 target2_addr = its_cmd_mask_field(its_cmd, 3, 16, 32);
 	struct kvm_vcpu *vcpu1, *vcpu2;
 	struct vgic_irq *irq;
 	u32 *intids;
 	int irq_count, i;
 
-	if (target1_addr >= atomic_read(&kvm->online_vcpus) ||
-	    target2_addr >= atomic_read(&kvm->online_vcpus))
+	/* We advertise GITS_TYPER.PTA==0, making the address the vcpu ID */
+	vcpu1 = kvm_get_vcpu_by_id(kvm, its_cmd_get_target_addr(its_cmd));
+	vcpu2 = kvm_get_vcpu_by_id(kvm, its_cmd_mask_field(its_cmd, 3, 16, 32));
+
+	if (!vcpu1 || !vcpu2)
 		return E_ITS_MOVALL_PROCNUM_OOR;
 
-	if (target1_addr == target2_addr)
+	if (vcpu1 == vcpu2)
 		return 0;
 
-	vcpu1 = kvm_get_vcpu(kvm, target1_addr);
-	vcpu2 = kvm_get_vcpu(kvm, target2_addr);
-
 	irq_count = vgic_copy_lpi_list(kvm, vcpu1, &intids);
 	if (irq_count < 0)
 		return irq_count;
@@ -2258,7 +2263,7 @@ static int vgic_its_restore_ite(struct vgic_its *its, u32 event_id,
 		return PTR_ERR(ite);
 
 	if (its_is_collection_mapped(collection))
-		vcpu = kvm_get_vcpu(kvm, collection->target_addr);
+		vcpu = kvm_get_vcpu_by_id(kvm, collection->target_addr);
 
 	irq = vgic_add_lpi(kvm, lpi_id, vcpu);
 	if (IS_ERR(irq)) {
@@ -2573,7 +2578,7 @@ static int vgic_its_restore_cte(struct vgic_its *its, gpa_t gpa, int esz)
 	coll_id = val & KVM_ITS_CTE_ICID_MASK;
 
 	if (target_addr != COLLECTION_NOT_MAPPED &&
-	    target_addr >= atomic_read(&kvm->online_vcpus))
+	    !kvm_get_vcpu_by_id(kvm, target_addr))
 		return -EINVAL;
 
 	collection = find_collection(its, coll_id);
-- 
2.34.1


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  parent reply	other threads:[~2023-09-27  9:10 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-09-27  9:09 [PATCH v3 00/11] KVM: arm64: Accelerate lookup of vcpus by MPIDR values (and other fixes) Marc Zyngier
2023-09-27  9:09 ` [PATCH v3 01/11] KVM: arm64: vgic: Make kvm_vgic_inject_irq() take a vcpu pointer Marc Zyngier
2023-09-27  9:09 ` Marc Zyngier [this message]
2023-09-27  9:09 ` [PATCH v3 03/11] KVM: arm64: vgic-v3: Refactor GICv3 SGI generation Marc Zyngier
2023-09-27  9:09 ` [PATCH v3 04/11] KVM: arm64: vgic-v2: Use cpuid from userspace as vcpu_id Marc Zyngier
2023-09-27  9:09 ` [PATCH v3 05/11] KVM: arm64: vgic: Use vcpu_idx for the debug information Marc Zyngier
2023-09-27  9:09 ` [PATCH v3 06/11] KVM: arm64: Use vcpu_idx for invalidation tracking Marc Zyngier
2023-09-27  9:09 ` [PATCH v3 07/11] KVM: arm64: Simplify kvm_vcpu_get_mpidr_aff() Marc Zyngier
2023-09-27  9:09 ` [PATCH v3 08/11] KVM: arm64: Build MPIDR to vcpu index cache at runtime Marc Zyngier
2023-09-27  9:09 ` [PATCH v3 09/11] KVM: arm64: Fast-track kvm_mpidr_to_vcpu() when mpidr_data is available Marc Zyngier
2023-09-27  9:09 ` [PATCH v3 10/11] KVM: arm64: vgic-v3: Optimize affinity-based SGI injection Marc Zyngier
2023-09-27  9:09 ` [PATCH v3 11/11] KVM: arm64: Clarify the ordering requirements for vcpu/RD creation Marc Zyngier
2023-09-30 18:27 ` [PATCH v3 00/11] KVM: arm64: Accelerate lookup of vcpus by MPIDR values (and other fixes) Oliver Upton

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