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From: Alexander Graf <agraf@suse.de>
To: kvm-ppc@vger.kernel.org
Cc: "kvm@vger.kernel.org mailing list" <kvm@vger.kernel.org>,
	Gleb Natapov <gleb@redhat.com>,
	Marcelo Tosatti <mtosatti@redhat.com>,
	Scott Wood <scottwood@freescale.com>
Subject: [PATCH 4/6] kvm/ppc: Hold srcu lock when calling kvm_io_bus_read/write
Date: Thu,  2 May 2013 15:32:49 +0200	[thread overview]
Message-ID: <1367501571-15509-5-git-send-email-agraf@suse.de> (raw)
In-Reply-To: <1367501571-15509-1-git-send-email-agraf@suse.de>

From: Scott Wood <scottwood@freescale.com>

These functions do an srcu_dereference without acquiring the srcu lock
themselves.

Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
---
 arch/powerpc/kvm/powerpc.c | 23 +++++++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index 31084c6..270773f 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -622,6 +622,8 @@ static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
 int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
                        unsigned int rt, unsigned int bytes, int is_bigendian)
 {
+	int idx, ret;
+
 	if (bytes > sizeof(run->mmio.data)) {
 		printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 		       run->mmio.len);
@@ -637,8 +639,14 @@ int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
 	vcpu->mmio_is_write = 0;
 	vcpu->arch.mmio_sign_extend = 0;
 
-	if (!kvm_io_bus_read(vcpu->kvm, KVM_MMIO_BUS, run->mmio.phys_addr,
-			     bytes, &run->mmio.data)) {
+	idx = srcu_read_lock(&vcpu->kvm->srcu);
+
+	ret = kvm_io_bus_read(vcpu->kvm, KVM_MMIO_BUS, run->mmio.phys_addr,
+			      bytes, &run->mmio.data);
+
+	srcu_read_unlock(&vcpu->kvm->srcu, idx);
+
+	if (!ret) {
 		kvmppc_complete_mmio_load(vcpu, run);
 		vcpu->mmio_needed = 0;
 		return EMULATE_DONE;
@@ -663,6 +671,7 @@ int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
                         u64 val, unsigned int bytes, int is_bigendian)
 {
 	void *data = run->mmio.data;
+	int idx, ret;
 
 	if (bytes > sizeof(run->mmio.data)) {
 		printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
@@ -692,8 +701,14 @@ int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
 		}
 	}
 
-	if (!kvm_io_bus_write(vcpu->kvm, KVM_MMIO_BUS, run->mmio.phys_addr,
-			      bytes, &run->mmio.data)) {
+	idx = srcu_read_lock(&vcpu->kvm->srcu);
+
+	ret = kvm_io_bus_write(vcpu->kvm, KVM_MMIO_BUS, run->mmio.phys_addr,
+			       bytes, &run->mmio.data);
+
+	srcu_read_unlock(&vcpu->kvm->srcu, idx);
+
+	if (!ret) {
 		vcpu->mmio_needed = 0;
 		return EMULATE_DONE;
 	}
-- 
1.8.1.4


WARNING: multiple messages have this Message-ID (diff)
From: Alexander Graf <agraf@suse.de>
To: kvm-ppc@vger.kernel.org
Cc: "kvm@vger.kernel.org mailing list" <kvm@vger.kernel.org>,
	Gleb Natapov <gleb@redhat.com>,
	Marcelo Tosatti <mtosatti@redhat.com>,
	Scott Wood <scottwood@freescale.com>
Subject: [PATCH 4/6] kvm/ppc: Hold srcu lock when calling kvm_io_bus_read/write
Date: Thu, 02 May 2013 13:32:49 +0000	[thread overview]
Message-ID: <1367501571-15509-5-git-send-email-agraf@suse.de> (raw)
In-Reply-To: <1367501571-15509-1-git-send-email-agraf@suse.de>

From: Scott Wood <scottwood@freescale.com>

These functions do an srcu_dereference without acquiring the srcu lock
themselves.

Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
---
 arch/powerpc/kvm/powerpc.c | 23 +++++++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index 31084c6..270773f 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -622,6 +622,8 @@ static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
 int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
                        unsigned int rt, unsigned int bytes, int is_bigendian)
 {
+	int idx, ret;
+
 	if (bytes > sizeof(run->mmio.data)) {
 		printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 		       run->mmio.len);
@@ -637,8 +639,14 @@ int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
 	vcpu->mmio_is_write = 0;
 	vcpu->arch.mmio_sign_extend = 0;
 
-	if (!kvm_io_bus_read(vcpu->kvm, KVM_MMIO_BUS, run->mmio.phys_addr,
-			     bytes, &run->mmio.data)) {
+	idx = srcu_read_lock(&vcpu->kvm->srcu);
+
+	ret = kvm_io_bus_read(vcpu->kvm, KVM_MMIO_BUS, run->mmio.phys_addr,
+			      bytes, &run->mmio.data);
+
+	srcu_read_unlock(&vcpu->kvm->srcu, idx);
+
+	if (!ret) {
 		kvmppc_complete_mmio_load(vcpu, run);
 		vcpu->mmio_needed = 0;
 		return EMULATE_DONE;
@@ -663,6 +671,7 @@ int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
                         u64 val, unsigned int bytes, int is_bigendian)
 {
 	void *data = run->mmio.data;
+	int idx, ret;
 
 	if (bytes > sizeof(run->mmio.data)) {
 		printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
@@ -692,8 +701,14 @@ int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
 		}
 	}
 
-	if (!kvm_io_bus_write(vcpu->kvm, KVM_MMIO_BUS, run->mmio.phys_addr,
-			      bytes, &run->mmio.data)) {
+	idx = srcu_read_lock(&vcpu->kvm->srcu);
+
+	ret = kvm_io_bus_write(vcpu->kvm, KVM_MMIO_BUS, run->mmio.phys_addr,
+			       bytes, &run->mmio.data);
+
+	srcu_read_unlock(&vcpu->kvm->srcu, idx);
+
+	if (!ret) {
 		vcpu->mmio_needed = 0;
 		return EMULATE_DONE;
 	}
-- 
1.8.1.4


  parent reply	other threads:[~2013-05-02 13:32 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-05-02 13:32 [PULL 0/6] ppc patch queue 2013-05-02 for 3.10 Alexander Graf
2013-05-02 13:32 ` Alexander Graf
2013-05-02 13:32 ` [PATCH 1/6] kvm/ppc/mpic: remove default routes from documentation Alexander Graf
2013-05-02 13:32   ` Alexander Graf
2013-05-02 13:32 ` [PATCH 2/6] kvm/ppc/mpic: fix mmio region lists when multiple guests used Alexander Graf
2013-05-02 13:32   ` Alexander Graf
2013-05-02 13:32 ` [PATCH 3/6] kvm/ppc/mpic: remove users Alexander Graf
2013-05-02 13:32   ` Alexander Graf
2013-05-02 13:32 ` Alexander Graf [this message]
2013-05-02 13:32   ` [PATCH 4/6] kvm/ppc: Hold srcu lock when calling kvm_io_bus_read/write Alexander Graf
2013-05-02 13:32 ` [PATCH 5/6] kvm/ppc/mpic: fix missing unlock in set_base_addr() Alexander Graf
2013-05-02 13:32   ` Alexander Graf
2013-05-02 13:32 ` [PATCH 6/6] KVM: PPC: Book3S: Add API for in-kernel XICS emulation Alexander Graf
2013-05-02 13:32   ` Alexander Graf
2013-05-03  0:09 ` [PULL 0/6] ppc patch queue 2013-05-02 for 3.10 Marcelo Tosatti
2013-05-03  0:09   ` Marcelo Tosatti

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