This allows the host kernel to handle H_PUT_TCE, H_PUT_TCE_INDIRECT
and H_STUFF_TCE requests targeted an IOMMU TCE table used for VFIO
without passing them to user space which saves time on switching
to user space and back.
This adds H_PUT_TCE/H_PUT_TCE_INDIRECT/H_STUFF_TCE handlers to KVM.
KVM tries to handle a TCE request in the real mode, if failed
it passes the request to the virtual mode to complete the operation.
If it a virtual mode handler fails, the request is passed to
the user space; this is not expected to happen though.
To avoid dealing with page use counters (which is tricky in real mode),
this only accelerates SPAPR TCE IOMMU v2 clients which are required
to pre-register the userspace memory. The very first TCE request will
be handled in the VFIO SPAPR TCE driver anyway as the userspace view
of the TCE table (iommu_table::it_userspace) is not allocated till
the very first mapping happens and we cannot call vmalloc in real mode.
This adds new attribute - KVM_DEV_VFIO_GROUP_SET_SPAPR_TCE - to
the VFIO KVM device. It takes a VFIO group fd and SPAPR TCE table fd
and associates a physical IOMMU table with the SPAPR TCE table (which
is a guest view of the hardware IOMMU table). The iommu_table object
is referenced so we do not have to retrieve in real mode when hypercall
happens.
This does not implement the UNSET counterpart as there is no use for it -
once the acceleration is enabled, the existing userspace won't
disable it unless a VFIO container is detroyed so this adds necessary
cleanup to the KVM_DEV_VFIO_GROUP_DEL handler.
This uses the kvm->lock mutex to protect against a race between
the VFIO KVM device's kvm_vfio_destroy() and SPAPR TCE table fd's
release() callback.
This uses per recently introduced VFIO group notifiers to do VFIO KVM
device cleanup. The KVM_DEV_VFIO_GROUP_SET_SPAPR_TCE handler registers
a notifier which removed itself from the notifier chain when called
with kvm==NULL. Since a block notifier cannot remove itself when
it is executing, this uses RCU to do actual removal. To make this work,
the KVM holds an additional (to KVM_DEV_VFIO_GROUP_ADD) external user
reference to a group and also relies on
"vfio: Check for unregistered notifiers when group is actually released".
While it works in most cases, there is a problem with VFIO PCI hotunplug:
QEMU calls vfio_kvm_device_del_group() and vfio_disconnect_container()
and the VFIO_GROUP_UNSET_CONTAINER handler may fail if RCU handler
has not been called yet so group->container_users counter is still
non-zero; this is workarounded by retrying VFIO_GROUP_UNSET_CONTAINER
in QEMU (this needs to be fixed, suggestions are welcome).
As this creates a descriptor per IOMMU table-LIOBN couple (called
kvmppc_spapr_tce_iommu_table), it is possible to have several
descriptors with the same iommu_table (hardware IOMMU table) attached
to the same LIOBN; this is done to simplify the cleanup and can be
improved later (even though there does not seem to be a user for it
any time soon).
This advertises the new KVM_CAP_SPAPR_TCE_VFIO capability to the user
space.
This finally makes use of vfio_external_user_iommu_id() which was
introduced quite some time ago and was considered for removal.
Tests show that this patch increases transmission speed from 220MB/s
to 750..1020MB/s on 10Gb network (Chelsea CXGB3 10Gb ethernet card).
Signed-off-by: Alexey Kardashevskiy <aik@xxxxxxxxx>
---
Changes:
v2:
* reworked to use new VFIO notifiers
* now same iommu_table may appear in the list several times, to be fixed later
---
Documentation/virtual/kvm/devices/vfio.txt | 22 +-
arch/powerpc/include/asm/kvm_host.h | 11 +
arch/powerpc/include/asm/kvm_ppc.h | 4 +
include/uapi/linux/kvm.h | 8 +
arch/powerpc/kvm/book3s_64_vio.c | 352 +++++++++++++++++++++++++++++
arch/powerpc/kvm/book3s_64_vio_hv.c | 178 +++++++++++++++
arch/powerpc/kvm/powerpc.c | 2 +
virt/kvm/vfio.c | 82 +++++++
8 files changed, 657 insertions(+), 2 deletions(-)
diff --git a/Documentation/virtual/kvm/devices/vfio.txt b/Documentation/virtual/kvm/devices/vfio.txt
index ef51740c67ca..f95d867168ea 100644
--- a/Documentation/virtual/kvm/devices/vfio.txt
+++ b/Documentation/virtual/kvm/devices/vfio.txt
@@ -16,7 +16,25 @@ Groups:
KVM_DEV_VFIO_GROUP attributes:
KVM_DEV_VFIO_GROUP_ADD: Add a VFIO group to VFIO-KVM device tracking
+ kvm_device_attr.addr points to an int32_t file descriptor
+ for the VFIO group.
KVM_DEV_VFIO_GROUP_DEL: Remove a VFIO group from VFIO-KVM device tracking
+ kvm_device_attr.addr points to an int32_t file descriptor
+ for the VFIO group.
+ KVM_DEV_VFIO_GROUP_SET_SPAPR_TCE: attaches a guest visible TCE table
+ allocated by sPAPR KVM.
+ kvm_device_attr.addr points to a struct:
-For each, kvm_device_attr.addr points to an int32_t file descriptor
-for the VFIO group.
+ struct kvm_vfio_spapr_tce {
+ __u32 argsz;
+ __u32 flags;
+ __s32 groupfd;
+ __s32 tablefd;
+ };
+
+ where
+ @argsz is the size of kvm_vfio_spapr_tce_liobn;
+ @flags are not supported now, must be zero;
+ @groupfd is a file descriptor for a VFIO group;
+ @tablefd is a file descriptor for a TCE table allocated via
+ KVM_CREATE_SPAPR_TCE.
diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
index 28350a294b1e..1079c25c1973 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -191,6 +191,16 @@ struct kvmppc_pginfo {
atomic_t refcnt;
};
+struct kvmppc_spapr_tce_iommu_table {
+ struct rcu_head rcu;
+ struct list_head next;
+ struct iommu_group *grp;
+ struct vfio_group *group;
+ struct iommu_table *tbl;
+ bool dying;
+ struct notifier_block notifier;
+};
+
struct kvmppc_spapr_tce_table {
struct list_head list;
struct kvm *kvm;
@@ -199,6 +209,7 @@ struct kvmppc_spapr_tce_table {
u32 page_shift;
u64 offset; /* in pages */
u64 size; /* window size in pages */
+ struct list_head iommu_tables;
struct page *pages[0];
};
diff --git a/arch/powerpc/include/asm/kvm_ppc.h b/arch/powerpc/include/asm/kvm_ppc.h
index 0a21c8503974..113fb2db2de9 100644
--- a/arch/powerpc/include/asm/kvm_ppc.h
+++ b/arch/powerpc/include/asm/kvm_ppc.h
@@ -163,6 +163,10 @@ extern long kvmppc_prepare_vrma(struct kvm *kvm,
extern void kvmppc_map_vrma(struct kvm_vcpu *vcpu,
struct kvm_memory_slot *memslot, unsigned long porder);
extern int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu);
+extern long kvm_spapr_tce_attach_iommu_group(struct kvm *kvm,
+ int tablefd,
+ struct vfio_group *group,
+ struct iommu_group *grp);
extern long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm,
struct kvm_create_spapr_tce_64 *args);
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 810f74317987..4088da4a575f 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -1068,6 +1068,7 @@ 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_GROUP_SET_SPAPR_TCE 3
enum kvm_device_type {
KVM_DEV_TYPE_FSL_MPIC_20 = 1,
@@ -1089,6 +1090,13 @@ enum kvm_device_type {
KVM_DEV_TYPE_MAX,
};
+struct kvm_vfio_spapr_tce {
+ __u32 argsz;
+ __u32 flags;
+ __s32 groupfd;
+ __s32 tablefd;
+};
+
/*
* ioctls for VM fds
*/
diff --git a/arch/powerpc/kvm/book3s_64_vio.c b/arch/powerpc/kvm/book3s_64_vio.c
index 15df8ae627d9..9ab04cdcc578 100644
--- a/arch/powerpc/kvm/book3s_64_vio.c
+++ b/arch/powerpc/kvm/book3s_64_vio.c
@@ -27,6 +27,10 @@
#include <linux/hugetlb.h>
#include <linux/list.h>
#include <linux/anon_inodes.h>
+#include <linux/iommu.h>
+#include <linux/file.h>
+#include <linux/vfio.h>
+#include <linux/module.h>
#include <asm/tlbflush.h>
#include <asm/kvm_ppc.h>
@@ -39,6 +43,74 @@
#include <asm/udbg.h>
#include <asm/iommu.h>
#include <asm/tce.h>
+#include <asm/mmu_context.h>
+
+extern int kvm_vfio_iommu_group_register_notifier(
+ struct iommu_group *iommugroup, enum vfio_notify_type type,
+ unsigned long *events, struct notifier_block *nb)
+{
+ int ret;
+ int (*fn)(struct iommu_group *iommugroup,
+ enum vfio_notify_type type,
+ unsigned long *events, struct notifier_block *nb);
+
+ fn = symbol_get(vfio_iommu_group_register_notifier);
+ if (!fn)
+ return -EINVAL;
+
+ ret = fn(iommugroup, type, events, nb);
+
+ symbol_put(vfio_iommu_group_register_notifier);
+
+ return ret;
+}
+
+extern int kvm_vfio_iommu_group_unregister_notifier(
+ struct iommu_group *iommugroup, enum vfio_notify_type type,
+ struct notifier_block *nb)
+{
+ int ret;
+ int (*fn)(struct iommu_group *iommugroup,
+ enum vfio_notify_type type,
+ struct notifier_block *nb);
+
+ fn = symbol_get(vfio_iommu_group_unregister_notifier);
+ if (!fn)
+ return -EINVAL;
+
+ ret = fn(iommugroup, type, nb);
+
+ symbol_put(vfio_iommu_group_unregister_notifier);
+
+ return ret;
+}
+
+extern void kvm_vfio_iommu_group_set_kvm(struct iommu_group *grp,
+ struct kvm *kvm)
+{
+ void (*fn)(struct iommu_group *grp, struct kvm *kvm);
+
+ fn = symbol_get(vfio_iommu_group_set_kvm);
+ if (!fn)
+ return;
+
+ fn(grp, kvm);
+
+ symbol_put(vfio_iommu_group_set_kvm);
+}
+
+static void kvm_vfio_group_put_external_user(struct vfio_group *vfio_group)
+{
+ void (*fn)(struct vfio_group *);
+
+ fn = symbol_get(vfio_group_put_external_user);
+ if (!fn)
+ return;
+
+ fn(vfio_group);
+
+ symbol_put(vfio_group_put_external_user);
+}
static unsigned long kvmppc_tce_pages(unsigned long iommu_pages)
{
@@ -129,9 +201,14 @@ static int kvm_spapr_tce_mmap(struct file *file, struct vm_area_struct *vma)
static int kvm_spapr_tce_release(struct inode *inode, struct file *filp)
{
struct kvmppc_spapr_tce_table *stt = filp->private_data;
+ struct kvmppc_spapr_tce_iommu_table *stit;
+ kick_all_cpus_sync();
list_del_rcu(&stt->list);
+ list_for_each_entry_rcu(stit, &stt->iommu_tables, next)
+ kvm_vfio_iommu_group_set_kvm(stit->grp, NULL);
+
kvm_put_kvm(stt->kvm);
kvmppc_account_memlimit(
@@ -146,6 +223,108 @@ static const struct file_operations kvm_spapr_tce_fops = {
.release = kvm_spapr_tce_release,
};
+static void kvm_spapr_tce_iommu_notifier_free(struct rcu_head *head)
+{
+ struct kvmppc_spapr_tce_iommu_table *stit = container_of(head,
+ struct kvmppc_spapr_tce_iommu_table, rcu);
+
+ kvm_vfio_iommu_group_unregister_notifier(stit->grp, VFIO_GROUP_NOTIFY,
+ &stit->notifier);
+ iommu_table_put(stit->tbl);
+ kvm_vfio_group_put_external_user(stit->group);
+ kfree(stit);
+}
+
+static int kvm_spapr_tce_iommu_notifier(struct notifier_block *nb,
+ unsigned long action, void *data)
+{
+ struct kvmppc_spapr_tce_iommu_table *stit = container_of(nb,
+ struct kvmppc_spapr_tce_iommu_table, notifier);
+
+ if (data)
+ return 0;
+
+ if (stit->dying)
+ return 0;
+
+ stit->dying = true;
+
+ list_del_rcu(&stit->next);
+
+ call_rcu(&stit->rcu, kvm_spapr_tce_iommu_notifier_free);
+
+ return 0;
+}
+
+extern long kvm_spapr_tce_attach_iommu_group(struct kvm *kvm, int tablefd,
+ struct vfio_group *group,
+ struct iommu_group *grp)
+{
+ struct kvmppc_spapr_tce_table *stt = NULL;
+ bool found = false;
+ struct iommu_table *tbl = NULL;
+ struct iommu_table_group *table_group;
+ long i, ret;
+ struct kvmppc_spapr_tce_iommu_table *stit;
+ unsigned long events;
+ struct fd f;
+
+ f = fdget(tablefd);
+ if (!f.file)
+ return -EBADF;
+
+ list_for_each_entry_rcu(stt, &kvm->arch.spapr_tce_tables, list) {
+ if (stt == f.file->private_data) {
+ found = true;
+ break;
+ }
+ }
+
+ fdput(f);
+
+ if (!found)
+ return -ENODEV;
+
+ table_group = iommu_group_get_iommudata(grp);
+ if (!table_group)
+ return -EFAULT;
+
+ for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) {
+ struct iommu_table *tbltmp = table_group->tables[i];
+
+ if (!tbltmp)
+ continue;
+
+ if ((tbltmp->it_page_shift == stt->page_shift) &&
+ (tbltmp->it_offset == stt->offset)) {
+ tbl = tbltmp;
+ break;
+ }
+ }
+ if (!tbl)
+ return -ENODEV;
+
+ iommu_table_get(tbl);
+
+ stit = kzalloc(sizeof(*stit), GFP_KERNEL);
+ stit->tbl = tbl;
+ stit->group = group;
+ stit->grp = grp;
+ stit->notifier.notifier_call = kvm_spapr_tce_iommu_notifier;
+
+ events = VFIO_GROUP_NOTIFY_SET_KVM;
+ ret = kvm_vfio_iommu_group_register_notifier(grp,
+ VFIO_GROUP_NOTIFY, &events, &stit->notifier);
+ if (ret) {
+ iommu_table_put(tbl);
+ kfree(stit);
+ return ret;
+ }
+ list_add_rcu(&stit->next, &stt->iommu_tables);
+
+ return 0;
+}
+
long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm,
struct kvm_create_spapr_tce_64 *args)
{
@@ -181,6 +360,7 @@ long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm,
stt->offset = args->offset;
stt->size = size;
stt->kvm = kvm;
+ INIT_LIST_HEAD_RCU(&stt->iommu_tables);
for (i = 0; i < npages; i++) {
stt->pages[i] = alloc_page(GFP_KERNEL | __GFP_ZERO);
@@ -209,11 +389,161 @@ long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm,
return ret;
}
+static long kvmppc_tce_iommu_mapped_dec(struct kvm *kvm,
+ struct iommu_table *tbl, unsigned long entry)
+{
+ struct mm_iommu_table_group_mem_t *mem = NULL;
+ const unsigned long pgsize = 1ULL << tbl->it_page_shift;
+ unsigned long *pua = IOMMU_TABLE_USERSPACE_ENTRY(tbl, entry);
+
+ if (!pua)
+ return H_HARDWARE;
+
+ mem = mm_iommu_lookup(kvm->mm, *pua, pgsize);
+ if (!mem)
+ return H_HARDWARE;
+
+ mm_iommu_mapped_dec(mem);
+
+ *pua = 0;
+
+ return H_SUCCESS;
+}
+
+static long kvmppc_tce_iommu_unmap(struct kvm *kvm,
+ struct iommu_table *tbl, unsigned long entry)
+{
+ enum dma_data_direction dir = DMA_NONE;
+ unsigned long hpa = 0;
+
+ if (iommu_tce_xchg(tbl, entry, &hpa, &dir))
+ return H_HARDWARE;
+
+ if (dir == DMA_NONE)
+ return H_SUCCESS;
+
+ return kvmppc_tce_iommu_mapped_dec(kvm, tbl, entry);
+}
+
+long kvmppc_tce_iommu_map(struct kvm *kvm, struct iommu_table *tbl,
+ unsigned long entry, unsigned long gpa,
+ enum dma_data_direction dir)
+{
+ long ret;
+ unsigned long hpa, ua, *pua = IOMMU_TABLE_USERSPACE_ENTRY(tbl, entry);
+ struct mm_iommu_table_group_mem_t *mem;
+
+ if (!pua)
+ /* it_userspace allocation might be delayed */
+ return H_TOO_HARD;
+
+ if (kvmppc_gpa_to_ua(kvm, gpa, &ua, NULL))
+ return H_HARDWARE;
+
+ mem = mm_iommu_lookup(kvm->mm, ua, 1ULL << tbl->it_page_shift);
+ if (!mem)
+ return H_HARDWARE;
+
+ if (mm_iommu_ua_to_hpa(mem, ua, &hpa))
+ return H_HARDWARE;
+
+ if (mm_iommu_mapped_inc(mem))
+ return H_HARDWARE;
+
+ ret = iommu_tce_xchg(tbl, entry, &hpa, &dir);
+ if (ret) {
+ mm_iommu_mapped_dec(mem);
+ return H_TOO_HARD;
+ }
+
+ if (dir != DMA_NONE)
+ kvmppc_tce_iommu_mapped_dec(kvm, tbl, entry);
+
+ *pua = ua;
+
+ return 0;
+}
+
+long kvmppc_h_put_tce_iommu(struct kvm_vcpu *vcpu,
+ struct iommu_table *tbl,
+ unsigned long liobn, unsigned long ioba,
+ unsigned long tce)
+{
+ long idx, ret = H_HARDWARE;
+ const unsigned long entry = ioba >> tbl->it_page_shift;
+ const unsigned long gpa = tce & ~(TCE_PCI_READ | TCE_PCI_WRITE);
+ const enum dma_data_direction dir = iommu_tce_direction(tce);
+
+ /* Clear TCE */
+ if (dir == DMA_NONE) {
+ if (iommu_tce_clear_param_check(tbl, ioba, 0, 1))
+ return H_PARAMETER;
+
+ return kvmppc_tce_iommu_unmap(vcpu->kvm, tbl, entry);
+ }
+
+ /* Put TCE */
+ if (iommu_tce_put_param_check(tbl, ioba, gpa))
+ return H_PARAMETER;
+
+ idx = srcu_read_lock(&vcpu->kvm->srcu);
+ ret = kvmppc_tce_iommu_map(vcpu->kvm, tbl, entry, gpa, dir);
+ srcu_read_unlock(&vcpu->kvm->srcu, idx);
+
+ return ret;
+}
+
+static long kvmppc_h_put_tce_indirect_iommu(struct kvm_vcpu *vcpu,
+ struct iommu_table *tbl, unsigned long ioba,
+ u64 __user *tces, unsigned long npages)
+{
+ unsigned long i, ret, tce, gpa;
+ const unsigned long entry = ioba >> tbl->it_page_shift;
+
+ for (i = 0; i < npages; ++i) {
+ gpa = be64_to_cpu(tces[i]) & ~(TCE_PCI_READ | TCE_PCI_WRITE);
+
+ if (iommu_tce_put_param_check(tbl, ioba +
+ (i << tbl->it_page_shift), gpa))
+ return H_PARAMETER;
+ }
+
+ for (i = 0; i < npages; ++i) {
+ tce = be64_to_cpu(tces[i]);
+ gpa = tce & ~(TCE_PCI_READ | TCE_PCI_WRITE);
+
+ ret = kvmppc_tce_iommu_map(vcpu->kvm, tbl, entry + i, gpa,
+ iommu_tce_direction(tce));
+ if (ret != H_SUCCESS)
+ return ret;
+ }
+
+ return H_SUCCESS;
+}
+
+long kvmppc_h_stuff_tce_iommu(struct kvm_vcpu *vcpu,
+ struct iommu_table *tbl,
+ unsigned long liobn, unsigned long ioba,
+ unsigned long tce_value, unsigned long npages)
+{
+ unsigned long i;
+ const unsigned long entry = ioba >> tbl->it_page_shift;
+
+ if (iommu_tce_clear_param_check(tbl, ioba, tce_value, npages))
+ return H_PARAMETER;
+
+ for (i = 0; i < npages; ++i)
+ kvmppc_tce_iommu_unmap(vcpu->kvm, tbl, entry + i);
+
+ return H_SUCCESS;
+}
+
long kvmppc_h_put_tce(struct kvm_vcpu *vcpu, unsigned long liobn,
unsigned long ioba, unsigned long tce)
{
struct kvmppc_spapr_tce_table *stt;
long ret;
+ struct kvmppc_spapr_tce_iommu_table *stit;
/* udbg_printf("H_PUT_TCE(): liobn=0x%lx ioba=0x%lx, tce=0x%lx\n", */
/* liobn, ioba, tce); */
@@ -230,6 +560,12 @@ long kvmppc_h_put_tce(struct kvm_vcpu *vcpu, unsigned long liobn,
if (ret != H_SUCCESS)
return ret;
+ list_for_each_entry_lockless(stit, &stt->iommu_tables, next) {
+ ret = kvmppc_h_put_tce_iommu(vcpu, stit->tbl, liobn, ioba, tce);
+ if (ret != H_SUCCESS)
+ return ret;
+ }
+
kvmppc_tce_put(stt, ioba >> stt->page_shift, tce);
return H_SUCCESS;
@@ -245,6 +581,7 @@ long kvmppc_h_put_tce_indirect(struct kvm_vcpu *vcpu,
unsigned long entry, ua = 0;
u64 __user *tces;
u64 tce;
+ struct kvmppc_spapr_tce_iommu_table *stit;
stt = kvmppc_find_table(vcpu->kvm, liobn);
if (!stt)
@@ -272,6 +609,13 @@ long kvmppc_h_put_tce_indirect(struct kvm_vcpu *vcpu,
}
tces = (u64 __user *) ua;
+ list_for_each_entry_lockless(stit, &stt->iommu_tables, next) {
+ ret = kvmppc_h_put_tce_indirect_iommu(vcpu,
+ stit->tbl, ioba, tces, npages);
+ if (ret != H_SUCCESS)
+ goto unlock_exit;
+ }
+
for (i = 0; i < npages; ++i) {
if (get_user(tce, tces + i)) {
ret = H_TOO_HARD;
@@ -299,6 +643,7 @@ long kvmppc_h_stuff_tce(struct kvm_vcpu *vcpu,
{
struct kvmppc_spapr_tce_table *stt;
long i, ret;
+ struct kvmppc_spapr_tce_iommu_table *stit;
stt = kvmppc_find_table(vcpu->kvm, liobn);
if (!stt)
@@ -312,6 +657,13 @@ long kvmppc_h_stuff_tce(struct kvm_vcpu *vcpu,
if (tce_value & (TCE_PCI_WRITE | TCE_PCI_READ))
return H_PARAMETER;
+ list_for_each_entry_lockless(stit, &stt->iommu_tables, next) {
+ ret = kvmppc_h_stuff_tce_iommu(vcpu, stit->tbl, liobn, ioba,
+ tce_value, npages);
+ if (ret != H_SUCCESS)
+ return ret;
+ }
+
for (i = 0; i < npages; ++i, ioba += (1ULL << stt->page_shift))
kvmppc_tce_put(stt, ioba >> stt->page_shift, tce_value);
diff --git a/arch/powerpc/kvm/book3s_64_vio_hv.c b/arch/powerpc/kvm/book3s_64_vio_hv.c
index 8a6834e6e1c8..4d6f01712a6d 100644
--- a/arch/powerpc/kvm/book3s_64_vio_hv.c
+++ b/arch/powerpc/kvm/book3s_64_vio_hv.c
@@ -190,11 +190,165 @@ static struct mm_iommu_table_group_mem_t *kvmppc_rm_iommu_lookup(
return mm_iommu_lookup_rm(vcpu->kvm->mm, ua, size);
}
+static long kvmppc_rm_tce_iommu_mapped_dec(struct kvm_vcpu *vcpu,
+ struct iommu_table *tbl, unsigned long entry)
+{
+ struct mm_iommu_table_group_mem_t *mem = NULL;
+ const unsigned long pgsize = 1ULL << tbl->it_page_shift;
+ unsigned long *pua = IOMMU_TABLE_USERSPACE_ENTRY(tbl, entry);
+
+ if (!pua)
+ return H_SUCCESS;
+
+ pua = (void *) vmalloc_to_phys(pua);
+ if (!pua)
+ return H_SUCCESS;
+
+ mem = kvmppc_rm_iommu_lookup(vcpu, *pua, pgsize);
+ if (!mem)
+ return H_HARDWARE;
+
+ mm_iommu_mapped_dec(mem);
+
+ *pua = 0;
+
+ return H_SUCCESS;
+}
+
+static long kvmppc_rm_tce_iommu_unmap(struct kvm_vcpu *vcpu,
+ struct iommu_table *tbl, unsigned long entry)
+{
+ enum dma_data_direction dir = DMA_NONE;
+ unsigned long hpa = 0;
+
+ if (iommu_tce_xchg_rm(tbl, entry, &hpa, &dir))
+ return H_HARDWARE;
+
+ if (dir == DMA_NONE)
+ return H_SUCCESS;
+
+ return kvmppc_rm_tce_iommu_mapped_dec(vcpu, tbl, entry);
+}
+
+long kvmppc_rm_tce_iommu_map(struct kvm_vcpu *vcpu, struct iommu_table *tbl,
+ unsigned long entry, unsigned long gpa,
+ enum dma_data_direction dir)
+{
+ long ret;
+ unsigned long hpa = 0, ua;
+ unsigned long *pua = IOMMU_TABLE_USERSPACE_ENTRY(tbl, entry);
+ struct mm_iommu_table_group_mem_t *mem;
+
+ if (!pua)
+ /* it_userspace allocation might be delayed */
+ return H_TOO_HARD;
+
+ if (kvmppc_gpa_to_ua(vcpu->kvm, gpa, &ua, NULL))
+ return H_HARDWARE;
+
+ mem = kvmppc_rm_iommu_lookup(vcpu, ua, 1ULL << tbl->it_page_shift);
+ if (!mem)
+ return H_HARDWARE;
+
+ if (mm_iommu_ua_to_hpa_rm(mem, ua, &hpa))
+ return H_HARDWARE;
+
+ pua = (void *) vmalloc_to_phys(pua);
+ if (!pua)
+ return H_HARDWARE;
+
+ if (mm_iommu_mapped_inc(mem))
+ return H_HARDWARE;
+
+ ret = iommu_tce_xchg_rm(tbl, entry, &hpa, &dir);
+ if (ret) {
+ mm_iommu_mapped_dec(mem);
+ return H_TOO_HARD;
+ }
+
+ if (dir != DMA_NONE)
+ kvmppc_rm_tce_iommu_mapped_dec(vcpu, tbl, entry);
+
+ *pua = ua;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(kvmppc_rm_tce_iommu_map);
+
+static long kvmppc_rm_h_put_tce_iommu(struct kvm_vcpu *vcpu,
+ struct iommu_table *tbl, unsigned long liobn,
+ unsigned long ioba, unsigned long tce)
+{
+ const unsigned long entry = ioba >> tbl->it_page_shift;
+ const unsigned long gpa = tce & ~(TCE_PCI_READ | TCE_PCI_WRITE);
+ const enum dma_data_direction dir = iommu_tce_direction(tce);
+
+ /* Clear TCE */
+ if (dir == DMA_NONE) {
+ if (iommu_tce_clear_param_check(tbl, ioba, 0, 1))
+ return H_PARAMETER;
+
+ return kvmppc_rm_tce_iommu_unmap(vcpu, tbl, entry);
+ }
+
+ /* Put TCE */
+ if (iommu_tce_put_param_check(tbl, ioba, gpa))
+ return H_PARAMETER;
+
+ return kvmppc_rm_tce_iommu_map(vcpu, tbl, entry, gpa, dir);
+}
+
+static long kvmppc_rm_h_put_tce_indirect_iommu(struct kvm_vcpu *vcpu,
+ struct iommu_table *tbl, unsigned long ioba,
+ u64 *tces, unsigned long npages)
+{
+ unsigned long i, ret, tce, gpa;
+ const unsigned long entry = ioba >> tbl->it_page_shift;
+
+ for (i = 0; i < npages; ++i) {
+ gpa = be64_to_cpu(tces[i]) & ~(TCE_PCI_READ | TCE_PCI_WRITE);
+
+ if (iommu_tce_put_param_check(tbl, ioba +
+ (i << tbl->it_page_shift), gpa))
+ return H_PARAMETER;
+ }
+
+ for (i = 0; i < npages; ++i) {
+ tce = be64_to_cpu(tces[i]);
+ gpa = tce & ~(TCE_PCI_READ | TCE_PCI_WRITE);
+
+ ret = kvmppc_rm_tce_iommu_map(vcpu, tbl, entry + i, gpa,
+ iommu_tce_direction(tce));
+ if (ret != H_SUCCESS)
+ return ret;
+ }
+
+ return H_SUCCESS;
+}
+
+static long kvmppc_rm_h_stuff_tce_iommu(struct kvm_vcpu *vcpu,
+ struct iommu_table *tbl,
+ unsigned long liobn, unsigned long ioba,
+ unsigned long tce_value, unsigned long npages)
+{
+ unsigned long i;
+ const unsigned long entry = ioba >> tbl->it_page_shift;
+
+ if (iommu_tce_clear_param_check(tbl, ioba, tce_value, npages))
+ return H_PARAMETER;
+
+ for (i = 0; i < npages; ++i)
+ kvmppc_rm_tce_iommu_unmap(vcpu, tbl, entry + i);
+
+ return H_SUCCESS;
+}
+
long kvmppc_rm_h_put_tce(struct kvm_vcpu *vcpu, unsigned long liobn,
unsigned long ioba, unsigned long tce)
{
struct kvmppc_spapr_tce_table *stt;
long ret;
+ struct kvmppc_spapr_tce_iommu_table *stit;
/* udbg_printf("H_PUT_TCE(): liobn=0x%lx ioba=0x%lx, tce=0x%lx\n", */
/* liobn, ioba, tce); */
@@ -211,6 +365,13 @@ long kvmppc_rm_h_put_tce(struct kvm_vcpu *vcpu, unsigned long liobn,
if (ret != H_SUCCESS)
return ret;
+ list_for_each_entry_lockless(stit, &stt->iommu_tables, next) {
+ ret = kvmppc_rm_h_put_tce_iommu(vcpu, stit->tbl,
+ liobn, ioba, tce);
+ if (ret != H_SUCCESS)
+ return ret;
+ }
+
kvmppc_tce_put(stt, ioba >> stt->page_shift, tce);
return H_SUCCESS;
@@ -278,6 +439,7 @@ long kvmppc_rm_h_put_tce_indirect(struct kvm_vcpu *vcpu,
* depend on hpt.
*/
struct mm_iommu_table_group_mem_t *mem;
+ struct kvmppc_spapr_tce_iommu_table *stit;
if (kvmppc_gpa_to_ua(vcpu->kvm, tce_list, &ua, NULL))
return H_TOO_HARD;
@@ -285,6 +447,13 @@ long kvmppc_rm_h_put_tce_indirect(struct kvm_vcpu *vcpu,
mem = kvmppc_rm_iommu_lookup(vcpu, ua, IOMMU_PAGE_SIZE_4K);
if (!mem || mm_iommu_ua_to_hpa_rm(mem, ua, &tces))
return H_TOO_HARD;
+
+ list_for_each_entry_lockless(stit, &stt->iommu_tables, next) {
+ ret = kvmppc_rm_h_put_tce_indirect_iommu(vcpu,
+ stit->tbl, ioba, (u64 *)tces, npages);
+ if (ret != H_SUCCESS)
+ return ret;
+ }
} else {
/*
* This is emulated devices case.
@@ -334,6 +503,8 @@ long kvmppc_rm_h_stuff_tce(struct kvm_vcpu *vcpu,
{
struct kvmppc_spapr_tce_table *stt;
long i, ret;
+ struct kvmppc_spapr_tce_iommu_table *stit;
+
stt = kvmppc_find_table(vcpu->kvm, liobn);
if (!stt)
@@ -347,6 +518,13 @@ long kvmppc_rm_h_stuff_tce(struct kvm_vcpu *vcpu,
if (tce_value & (TCE_PCI_WRITE | TCE_PCI_READ))
return H_PARAMETER;
+ list_for_each_entry_lockless(stit, &stt->iommu_tables, next) {
+ ret = kvmppc_rm_h_stuff_tce_iommu(vcpu, stit->tbl,
+ liobn, ioba, tce_value, npages);
+ if (ret != H_SUCCESS)
+ return ret;
+ }
+
for (i = 0; i < npages; ++i, ioba += (1ULL << stt->page_shift))
kvmppc_tce_put(stt, ioba >> stt->page_shift, tce_value);
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index 70963c845e96..0e555ba998c0 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -536,6 +536,8 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
#ifdef CONFIG_PPC_BOOK3S_64
case KVM_CAP_SPAPR_TCE:
case KVM_CAP_SPAPR_TCE_64:
+ /* fallthrough */
+ case KVM_CAP_SPAPR_TCE_VFIO:
case KVM_CAP_PPC_ALLOC_HTAB:
case KVM_CAP_PPC_RTAS:
case KVM_CAP_PPC_FIXUP_HCALL:
diff --git a/virt/kvm/vfio.c b/virt/kvm/vfio.c
index d32f239eb471..6077c63e0235 100644
--- a/virt/kvm/vfio.c
+++ b/virt/kvm/vfio.c
@@ -20,6 +20,10 @@
#include <linux/vfio.h>
#include "vfio.h"
+#ifdef CONFIG_SPAPR_TCE_IOMMU
+#include <asm/kvm_ppc.h>
+#endif
+
struct kvm_vfio_group {
struct list_head node;
struct vfio_group *vfio_group;
@@ -89,6 +93,22 @@ static bool kvm_vfio_group_is_coherent(struct vfio_group *vfio_group)
return ret > 0;
}
+static int kvm_vfio_external_user_iommu_id(struct vfio_group *vfio_group)
+{
+ int (*fn)(struct vfio_group *);
+ int ret = -1;
+
+ fn = symbol_get(vfio_external_user_iommu_id);
+ if (!fn)
+ return ret;
+
+ ret = fn(vfio_group);
+
+ symbol_put(vfio_external_user_iommu_id);
+
+ return ret;
+}
+
/*
* Groups can use the same or different IOMMU domains. If the same then
* adding a new group may change the coherency of groups we've previously
@@ -218,6 +238,65 @@ static int kvm_vfio_set_group(struct kvm_device *dev, long attr, u64 arg)
kvm_vfio_update_coherency(dev);
return ret;
+
+#ifdef CONFIG_SPAPR_TCE_IOMMU
+ case KVM_DEV_VFIO_GROUP_SET_SPAPR_TCE: {
+ struct kvm_vfio_spapr_tce param;
+ unsigned long minsz;
+ struct kvm_vfio *kv = dev->private;
+ struct vfio_group *vfio_group;
+ struct kvm_vfio_group *kvg;
+ struct fd f;
+
+ minsz = offsetofend(struct kvm_vfio_spapr_tce, tablefd);
+
+ if (copy_from_user(¶m, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (param.argsz < minsz || param.flags)
+ return -EINVAL;
+
+ f = fdget(param.groupfd);
+ if (!f.file)
+ return -EBADF;
+
+ vfio_group = kvm_vfio_group_get_external_user(f.file);
+ fdput(f);
+
+ if (IS_ERR(vfio_group))
+ return PTR_ERR(vfio_group);
+
+ ret = -ENOENT;
+
+ mutex_lock(&kv->lock);
+
+ list_for_each_entry(kvg, &kv->group_list, node) {
+ int group_id;
+ struct iommu_group *grp;
+
+ if (kvg->vfio_group != vfio_group)
+ continue;
+
+ group_id = kvm_vfio_external_user_iommu_id(
+ kvg->vfio_group);
+ grp = iommu_group_get_by_id(group_id);
+ if (!grp) {
+ ret = -EFAULT;
+ break;
+ }
+
+ ret = kvm_spapr_tce_attach_iommu_group(dev->kvm,
+ param.tablefd, vfio_group, grp);
+
+ iommu_group_put(grp);
+ break;
+ }
+
+ mutex_unlock(&kv->lock);
+
+ return ret;
+ }
+#endif /* CONFIG_SPAPR_TCE_IOMMU */
}
return -ENXIO;
@@ -242,6 +321,9 @@ static int kvm_vfio_has_attr(struct kvm_device *dev,
switch (attr->attr) {
case KVM_DEV_VFIO_GROUP_ADD:
case KVM_DEV_VFIO_GROUP_DEL:
+#ifdef CONFIG_SPAPR_TCE_IOMMU
+ case KVM_DEV_VFIO_GROUP_SET_SPAPR_TCE:
+#endif
return 0;
}
--
2.11.0
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