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Subject[RFC PATCH v2] KVM: PPC: vfio kvm device: support spapr tce
Date
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
---

Changes:
v2:
* it does not try to introduce a realmode search function.
Instead, liobn-to-iommu-group lookup is done by VFIO KVM device
in virtual mode and the result (iommu_group pointer) is cached
in kvm_arch so the realmode handlers do not use VFIO KVM device for that.
And the iommu groups get released on KVM termination.

I tried this, seems viable.

Did not I miss anything? Thanks.


---
arch/powerpc/include/asm/kvm_host.h | 3 ++
arch/powerpc/kvm/Kconfig | 1 +
arch/powerpc/kvm/Makefile | 3 ++
include/linux/vfio.h | 3 ++
include/uapi/linux/kvm.h | 1 +
virt/kvm/vfio.c | 74 +++++++++++++++++++++++++++++++++++++
6 files changed, 85 insertions(+)

diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
index 48dbe8b..e1163d7 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -293,6 +293,9 @@ struct kvm_arch {
#ifdef CONFIG_KVM_XICS
struct kvmppc_xics *xics;
#endif
+#ifdef CONFIG_KVM_VFIO
+ struct kvm_vfio *vfio;
+#endif
};

/*
diff --git a/arch/powerpc/kvm/Kconfig b/arch/powerpc/kvm/Kconfig
index 61b3535..d1b7f64 100644
--- a/arch/powerpc/kvm/Kconfig
+++ b/arch/powerpc/kvm/Kconfig
@@ -60,6 +60,7 @@ config KVM_BOOK3S_64
select KVM_BOOK3S_64_HANDLER
select KVM
select SPAPR_TCE_IOMMU
+ select KVM_VFIO
---help---
Support running unmodified book3s_64 and book3s_32 guest kernels
in virtual machines on book3s_64 host processors.
diff --git a/arch/powerpc/kvm/Makefile b/arch/powerpc/kvm/Makefile
index 6646c95..2438d2e 100644
--- a/arch/powerpc/kvm/Makefile
+++ b/arch/powerpc/kvm/Makefile
@@ -87,6 +87,9 @@ kvm-book3s_64-builtin-objs-$(CONFIG_KVM_BOOK3S_64_HV) := \
kvm-book3s_64-objs-$(CONFIG_KVM_XICS) += \
book3s_xics.o

+kvm-book3s_64-objs-$(CONFIG_KVM_VFIO) += \
+ $(KVM)/vfio.o \
+
kvm-book3s_64-module-objs := \
$(KVM)/kvm_main.o \
$(KVM)/eventfd.o \
diff --git a/include/linux/vfio.h b/include/linux/vfio.h
index 24579a0..681e19b 100644
--- a/include/linux/vfio.h
+++ b/include/linux/vfio.h
@@ -97,4 +97,7 @@ extern struct vfio_group *vfio_group_get_external_user(struct file *filep);
extern void vfio_group_put_external_user(struct vfio_group *group);
extern int vfio_external_user_iommu_id(struct vfio_group *group);

+extern struct iommu_group *vfio_find_group_by_liobn(struct kvm *kvm,
+ unsigned long liobn);
+
#endif /* VFIO_H */
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 7c1a349..a74ad16 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -847,6 +847,7 @@ struct kvm_device_attr {
#define KVM_DEV_VFIO_GROUP 1
#define KVM_DEV_VFIO_GROUP_ADD 1
#define KVM_DEV_VFIO_GROUP_DEL 2
+#define KVM_DEV_VFIO_SPAPR_TCE_LIOBN 2

/*
* ioctls for VM fds
diff --git a/virt/kvm/vfio.c b/virt/kvm/vfio.c
index ca4260e..f9271d5 100644
--- a/virt/kvm/vfio.c
+++ b/virt/kvm/vfio.c
@@ -22,6 +22,9 @@
struct kvm_vfio_group {
struct list_head node;
struct vfio_group *vfio_group;
+#ifdef CONFIG_SPAPR_TCE_IOMMU
+ uint64_t liobn;
+#endif
};

struct kvm_vfio {
@@ -188,12 +191,76 @@ static int kvm_vfio_set_group(struct kvm_device *dev, long attr, u64 arg)
return -ENXIO;
}

+#ifdef CONFIG_SPAPR_TCE_IOMMU
+static int kvm_vfio_set_spapr_tce_liobn(struct kvm_device *dev,
+ long attr, u64 arg)
+{
+ struct kvm_vfio *kv = dev->private;
+ struct vfio_group *vfio_group;
+ struct kvm_vfio_group *kvg;
+ void __user *argp = (void __user *)arg;
+ struct fd f;
+ int32_t fd;
+ uint64_t liobn = attr;
+
+ if (get_user(fd, (int32_t __user *)argp))
+ return -EFAULT;
+
+ f = fdget(fd);
+ if (!f.file)
+ return -EBADF;
+
+ vfio_group = kvm_vfio_group_get_external_user(f.file);
+ fdput(f);
+
+ list_for_each_entry(kvg, &kv->group_list, node) {
+ if (kvg->vfio_group == vfio_group) {
+ WARN_ON(kvg->liobn);
+ kvg->liobn = liobn;
+ kvm_vfio_group_put_external_user(vfio_group);
+ return 0;
+ }
+ }
+
+ kvm_vfio_group_put_external_user(vfio_group);
+
+ return -ENXIO;
+}
+
+struct iommu_group *vfio_find_group_by_liobn(struct kvm *kvm,
+ unsigned long liobn)
+{
+ struct kvm_vfio_group *kvg;
+
+ if (!kvm->arch.vfio)
+ return NULL;
+
+ list_for_each_entry(kvg, &kvm->arch.vfio->group_list, node) {
+ if (kvg->liobn == liobn) {
+ int group_id = vfio_external_user_iommu_id(
+ kvg->vfio_group);
+ struct iommu_group *grp =
+ iommu_group_get_by_id(group_id);
+ return grp;
+ }
+ }
+
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(vfio_find_group_by_liobn);
+#endif
+
static int kvm_vfio_set_attr(struct kvm_device *dev,
struct kvm_device_attr *attr)
{
switch (attr->group) {
case KVM_DEV_VFIO_GROUP:
return kvm_vfio_set_group(dev, attr->attr, attr->addr);
+#ifdef CONFIG_SPAPR_TCE_IOMMU
+ case KVM_DEV_VFIO_SPAPR_TCE_LIOBN:
+ return kvm_vfio_set_spapr_tce_liobn(dev, attr->attr,
+ attr->addr);
+#endif
}

return -ENXIO;
@@ -211,6 +278,10 @@ static int kvm_vfio_has_attr(struct kvm_device *dev,
}

break;
+#ifdef CONFIG_SPAPR_TCE_IOMMU
+ case KVM_DEV_VFIO_SPAPR_TCE_LIOBN:
+ return 0;
+#endif
}

return -ENXIO;
@@ -251,6 +322,9 @@ static int kvm_vfio_create(struct kvm_device *dev, u32 type)
mutex_init(&kv->lock);

dev->private = kv;
+#ifdef CONFIG_SPAPR_TCE_IOMMU
+ dev->kvm->arch.vfio = kv;
+#endif

return 0;
}
--
1.8.4.rc4


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