[RFC PATCH] PPC: KVM: vfio kvm device: support spapr tce
From: Alexey Kardashevskiy
Date: Fri Oct 04 2013 - 08:24:23 EST
This is a very rough change set required for ppc64 to use this KVM device.
vfio_rm.c is a piece of code which is going to be called from the realmode (MMU off),
and I will put everything spapr-related under #ifdef CONFIG_SPAPR_TCE_IOMMU,
it is just friday and I have to run :)
This is an RFC but it works.
Signed-off-by: Alexey Kardashevskiy <aik@xxxxxxxxx>
---
arch/powerpc/kvm/Kconfig | 1 +
arch/powerpc/kvm/Makefile | 4 ++++
include/linux/kvm_host.h | 8 ++++---
include/linux/vfio.h | 3 +++
include/uapi/linux/kvm.h | 1 +
virt/kvm/vfio.c | 46 ++++++++++++++++++++++++++++++++++++++++
virt/kvm/vfio_rm.c | 54 +++++++++++++++++++++++++++++++++++++++++++++++
7 files changed, 114 insertions(+), 3 deletions(-)
create mode 100644 virt/kvm/vfio_rm.c
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..fc2878b 100644
--- a/arch/powerpc/kvm/Makefile
+++ b/arch/powerpc/kvm/Makefile
@@ -55,6 +55,8 @@ kvm-objs-$(CONFIG_KVM_E500MC) := $(kvm-e500mc-objs)
kvm-book3s_64-objs-$(CONFIG_KVM_BOOK3S_64_PR) := \
$(KVM)/coalesced_mmio.o \
+ $(KVM)/vfio.o \
+ $(KVM)/vfio_rm.o \
fpu.o \
book3s_paired_singles.o \
book3s_pr.o \
@@ -76,6 +78,7 @@ kvm-book3s_64-objs-$(CONFIG_KVM_BOOK3S_64_HV) := \
kvm-book3s_64-builtin-xics-objs-$(CONFIG_KVM_XICS) := \
book3s_hv_rm_xics.o
kvm-book3s_64-builtin-objs-$(CONFIG_KVM_BOOK3S_64_HV) := \
+ $(KVM)/vfio_rm.o \
book3s_hv_rmhandlers.o \
book3s_hv_rm_mmu.o \
book3s_64_vio_hv.o \
@@ -89,6 +92,7 @@ kvm-book3s_64-objs-$(CONFIG_KVM_XICS) += \
kvm-book3s_64-module-objs := \
$(KVM)/kvm_main.o \
+ $(KVM)/vfio.o \
$(KVM)/eventfd.o \
powerpc.o \
emulate.o \
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index ad2b581..43c0290 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -407,6 +407,8 @@ struct kvm {
#endif
long tlbs_dirty;
struct list_head devices;
+
+ struct kvm_vfio *vfio;
};
#define kvm_err(fmt, ...) \
@@ -677,15 +679,15 @@ void kvm_arch_register_noncoherent_dma(struct kvm *kvm);
void kvm_arch_unregister_noncoherent_dma(struct kvm *kvm);
bool kvm_arch_has_noncoherent_dma(struct kvm *kvm);
#else
-static inline void kvm_arch_register_noncoherent_dma(void)
+static inline void kvm_arch_register_noncoherent_dma(struct kvm *kvm)
{
}
-static inline void kvm_arch_unregister_noncoherent_dma(void)
+static inline void kvm_arch_unregister_noncoherent_dma(struct kvm *kvm)
{
}
-static inline bool kvm_arch_has_noncoherent_dma(void)
+static inline bool kvm_arch_has_noncoherent_dma(struct kvm *kvm)
{
return false;
}
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 2e336a7..39dea9f 100644
--- a/virt/kvm/vfio.c
+++ b/virt/kvm/vfio.c
@@ -22,6 +22,7 @@
struct kvm_vfio_group {
struct list_head node;
struct vfio_group *vfio_group;
+ uint64_t liobn; /* sPAPR */
};
struct kvm_vfio {
@@ -188,12 +189,52 @@ static int kvm_vfio_set_group(struct kvm_device *dev, long attr, u64 arg)
return -ENXIO;
}
+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;
+}
+
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 +252,10 @@ 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;
@@ -250,6 +295,7 @@ static int kvm_vfio_create(struct kvm_device *dev, u32 type)
mutex_init(&kv->lock);
dev->private = kv;
+ dev->kvm->vfio = kv;
return 0;
}
diff --git a/virt/kvm/vfio_rm.c b/virt/kvm/vfio_rm.c
new file mode 100644
index 0000000..ee9fd96
--- /dev/null
+++ b/virt/kvm/vfio_rm.c
@@ -0,0 +1,54 @@
+#include <linux/errno.h>
+#include <linux/file.h>
+#include <linux/kvm_host.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+#include <linux/vfio.h>
+
+struct kvm_vfio_group {
+ struct list_head node;
+ struct vfio_group *vfio_group;
+ uint64_t liobn; /* sPAPR */
+};
+
+struct kvm_vfio {
+ struct list_head group_list;
+ struct mutex lock;
+ bool noncoherent;
+};
+
+struct vfio_group {
+ struct kref kref;
+ int minor;
+ atomic_t container_users;
+ struct iommu_group *iommu_group;
+ struct vfio_container *container;
+ struct list_head device_list;
+ struct mutex device_lock;
+ struct device *dev;
+ struct notifier_block nb;
+ struct list_head vfio_next;
+ struct list_head container_next;
+ atomic_t opened;
+};
+
+struct iommu_group *vfio_find_group_by_liobn(struct kvm *kvm, unsigned long liobn)
+{
+ struct kvm_vfio_group *kvg;
+
+ if (!kvm->vfio)
+ return NULL;
+
+ list_for_each_entry(kvg, &kvm->vfio->group_list, node) {
+ if (kvg->liobn == liobn)
+ return kvg->vfio_group->iommu_group;
+ }
+
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(vfio_find_group_by_liobn);
+
+
--
1.8.4.rc4
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