11 files changed, 268 insertions, 3 deletions

diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
index e8875fef3eb8..a1d344d5ff4c 100644
--- a/Documentation/virtual/kvm/api.txt
+++ b/Documentation/virtual/kvm/api.txt
@@ -1350,6 +1350,41 @@ The following flags are defined:
 If datamatch flag is set, the event will be signaled only if the written value
 to the registered address is equal to datamatch in struct kvm_ioeventfd.
 
+4.62 KVM_CREATE_SPAPR_TCE
+
+Capability: KVM_CAP_SPAPR_TCE
+Architectures: powerpc
+Type: vm ioctl
+Parameters: struct kvm_create_spapr_tce (in)
+Returns: file descriptor for manipulating the created TCE table
+
+This creates a virtual TCE (translation control entry) table, which
+is an IOMMU for PAPR-style virtual I/O.  It is used to translate
+logical addresses used in virtual I/O into guest physical addresses,
+and provides a scatter/gather capability for PAPR virtual I/O.
+
+/* for KVM_CAP_SPAPR_TCE */
+struct kvm_create_spapr_tce {
+        __u64 liobn;
+        __u32 window_size;
+};
+
+The liobn field gives the logical IO bus number for which to create a
+TCE table.  The window_size field specifies the size of the DMA window
+which this TCE table will translate - the table will contain one 64
+bit TCE entry for every 4kiB of the DMA window.
+
+When the guest issues an H_PUT_TCE hcall on a liobn for which a TCE
+table has been created using this ioctl(), the kernel will handle it
+in real mode, updating the TCE table.  H_PUT_TCE calls for other
+liobns will cause a vm exit and must be handled by userspace.
+
+The return value is a file descriptor which can be passed to mmap(2)
+to map the created TCE table into userspace.  This lets userspace read
+the entries written by kernel-handled H_PUT_TCE calls, and also lets
+userspace update the TCE table directly which is useful in some
+circumstances.
+
 5. The kvm_run structure
 
 Application code obtains a pointer to the kvm_run structure by
diff --git a/arch/powerpc/include/asm/kvm.h b/arch/powerpc/include/asm/kvm.h
index d2ca5ed3877b..c3ec990daf45 100644
--- a/arch/powerpc/include/asm/kvm.h
+++ b/arch/powerpc/include/asm/kvm.h
@@ -22,6 +22,9 @@
 
 #include <linux/types.h>
 
+/* Select powerpc specific features in <linux/kvm.h> */
+#define __KVM_HAVE_SPAPR_TCE
+
 struct kvm_regs {
         __u64 pc;
         __u64 cr;
@@ -272,4 +275,10 @@ struct kvm_guest_debug_arch {
 #define KVM_INTERRUPT_UNSET     -2U
 #define KVM_INTERRUPT_SET_LEVEL -3U
 
+/* for KVM_CAP_SPAPR_TCE */
+struct kvm_create_spapr_tce {
+        __u64 liobn;
+        __u32 window_size;
+};
+
 #endif /* __LINUX_KVM_POWERPC_H */
diff --git a/arch/powerpc/include/asm/kvm_book3s_64.h b/arch/powerpc/include/asm/kvm_book3s_64.h
index 5f73388ea0af..e43fe42b9875 100644
--- a/arch/powerpc/include/asm/kvm_book3s_64.h
+++ b/arch/powerpc/include/asm/kvm_book3s_64.h
@@ -27,4 +27,6 @@ static inline struct kvmppc_book3s_shadow_vcpu *to_svcpu(struct kvm_vcpu *vcpu)
 }
 #endif
 
+#define SPAPR_TCE_SHIFT         12
+
 #endif /* __ASM_KVM_BOOK3S_64_H__ */
diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
index 6ebf1721680a..5616e39a7fa4 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -144,6 +144,14 @@ struct kvmppc_pginfo {
         atomic_t refcnt;
 };
 
+struct kvmppc_spapr_tce_table {
+        struct list_head list;
+        struct kvm *kvm;
+        u64 liobn;
+        u32 window_size;
+        struct page *pages[0];
+};
+
 struct kvm_arch {
 #ifdef CONFIG_KVM_BOOK3S_64_HV
         unsigned long hpt_virt;
@@ -157,6 +165,7 @@ struct kvm_arch {
         unsigned long sdr1;
         unsigned long host_sdr1;
         int tlbie_lock;
+        struct list_head spapr_tce_tables;
         unsigned short last_vcpu[NR_CPUS];
 #endif /* CONFIG_KVM_BOOK3S_64_HV */
 };
diff --git a/arch/powerpc/include/asm/kvm_ppc.h b/arch/powerpc/include/asm/kvm_ppc.h
index 2afe92e6f625..99f6fcf4cf88 100644
--- a/arch/powerpc/include/asm/kvm_ppc.h
+++ b/arch/powerpc/include/asm/kvm_ppc.h
@@ -119,6 +119,8 @@ extern long kvmppc_prepare_vrma(struct kvm *kvm,
 extern void kvmppc_map_vrma(struct kvm *kvm,
                             struct kvm_userspace_memory_region *mem);
 extern int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu);
+extern long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm,
+                                struct kvm_create_spapr_tce *args);
 extern int kvmppc_core_init_vm(struct kvm *kvm);
 extern void kvmppc_core_destroy_vm(struct kvm *kvm);
 extern int kvmppc_core_prepare_memory_region(struct kvm *kvm,
diff --git a/arch/powerpc/kvm/Makefile b/arch/powerpc/kvm/Makefile
index 2ecffc0dc1bb..1de3d54901d4 100644
--- a/arch/powerpc/kvm/Makefile
+++ b/arch/powerpc/kvm/Makefile
@@ -55,7 +55,8 @@ kvm-book3s_64-objs-$(CONFIG_KVM_BOOK3S_64_HV) := \
         book3s_hv_interrupts.o \
         book3s_64_mmu_hv.o
 kvm-book3s_64-builtin-objs-$(CONFIG_KVM_BOOK3S_64_HV) := \
-        book3s_hv_rm_mmu.o
+        book3s_hv_rm_mmu.o \
+        book3s_64_vio_hv.o
 
 kvm-book3s_64-module-objs := \
         ../../../virt/kvm/kvm_main.o \
diff --git a/arch/powerpc/kvm/book3s_64_vio_hv.c b/arch/powerpc/kvm/book3s_64_vio_hv.c
new file mode 100644
index 000000000000..ea0f8c537c28
--- /dev/null
+++ b/arch/powerpc/kvm/book3s_64_vio_hv.c
@@ -0,0 +1,73 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ * Copyright 2010 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
+ * Copyright 2011 David Gibson, IBM Corporation <dwg@au1.ibm.com>
+ */
+
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/kvm.h>
+#include <linux/kvm_host.h>
+#include <linux/highmem.h>
+#include <linux/gfp.h>
+#include <linux/slab.h>
+#include <linux/hugetlb.h>
+#include <linux/list.h>
+
+#include <asm/tlbflush.h>
+#include <asm/kvm_ppc.h>
+#include <asm/kvm_book3s.h>
+#include <asm/mmu-hash64.h>
+#include <asm/hvcall.h>
+#include <asm/synch.h>
+#include <asm/ppc-opcode.h>
+#include <asm/kvm_host.h>
+#include <asm/udbg.h>
+
+#define TCES_PER_PAGE   (PAGE_SIZE / sizeof(u64))
+
+long kvmppc_h_put_tce(struct kvm_vcpu *vcpu, unsigned long liobn,
+                      unsigned long ioba, unsigned long tce)
+{
+        struct kvm *kvm = vcpu->kvm;
+        struct kvmppc_spapr_tce_table *stt;
+
+        /* udbg_printf("H_PUT_TCE(): liobn=0x%lx ioba=0x%lx, tce=0x%lx\n", */
+        /*          liobn, ioba, tce); */
+
+        list_for_each_entry(stt, &kvm->arch.spapr_tce_tables, list) {
+                if (stt->liobn == liobn) {
+                        unsigned long idx = ioba >> SPAPR_TCE_SHIFT;
+                        struct page *page;
+                        u64 *tbl;
+
+                        /* udbg_printf("H_PUT_TCE: liobn 0x%lx => stt=%p  window_size=0x%x\n", */
+                        /*          liobn, stt, stt->window_size); */
+                        if (ioba >= stt->window_size)
+                                return H_PARAMETER;
+
+                        page = stt->pages[idx / TCES_PER_PAGE];
+                        tbl = (u64 *)page_address(page);
+
+                        /* FIXME: Need to validate the TCE itself */
+                        /* udbg_printf("tce @ %p\n", &tbl[idx % TCES_PER_PAGE]); */
+                        tbl[idx % TCES_PER_PAGE] = tce;
+                        return H_SUCCESS;
+                }
+        }
+
+        /* Didn't find the liobn, punt it to userspace */
+        return H_TOO_HARD;
+}
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index af862c30b70e..6fe469eabce8 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -538,6 +538,116 @@ int kvmppc_vcpu_run(struct kvm_run *run, struct kvm_vcpu *vcpu)
         return r;
 }
 
+static long kvmppc_stt_npages(unsigned long window_size)
+{
+        return ALIGN((window_size >> SPAPR_TCE_SHIFT)
+                     * sizeof(u64), PAGE_SIZE) / PAGE_SIZE;
+}
+
+static void release_spapr_tce_table(struct kvmppc_spapr_tce_table *stt)
+{
+        struct kvm *kvm = stt->kvm;
+        int i;
+
+        mutex_lock(&kvm->lock);
+        list_del(&stt->list);
+        for (i = 0; i < kvmppc_stt_npages(stt->window_size); i++)
+                __free_page(stt->pages[i]);
+        kfree(stt);
+        mutex_unlock(&kvm->lock);
+
+        kvm_put_kvm(kvm);
+}
+
+static int kvm_spapr_tce_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
+{
+        struct kvmppc_spapr_tce_table *stt = vma->vm_file->private_data;
+        struct page *page;
+
+        if (vmf->pgoff >= kvmppc_stt_npages(stt->window_size))
+                return VM_FAULT_SIGBUS;
+
+        page = stt->pages[vmf->pgoff];
+        get_page(page);
+        vmf->page = page;
+        return 0;
+}
+
+static const struct vm_operations_struct kvm_spapr_tce_vm_ops = {
+        .fault = kvm_spapr_tce_fault,
+};
+
+static int kvm_spapr_tce_mmap(struct file *file, struct vm_area_struct *vma)
+{
+        vma->vm_ops = &kvm_spapr_tce_vm_ops;
+        return 0;
+}
+
+static int kvm_spapr_tce_release(struct inode *inode, struct file *filp)
+{
+        struct kvmppc_spapr_tce_table *stt = filp->private_data;
+
+        release_spapr_tce_table(stt);
+        return 0;
+}
+
+static struct file_operations kvm_spapr_tce_fops = {
+        .mmap           = kvm_spapr_tce_mmap,
+        .release        = kvm_spapr_tce_release,
+};
+
+long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm,
+                                   struct kvm_create_spapr_tce *args)
+{
+        struct kvmppc_spapr_tce_table *stt = NULL;
+        long npages;
+        int ret = -ENOMEM;
+        int i;
+
+        /* Check this LIOBN hasn't been previously allocated */
+        list_for_each_entry(stt, &kvm->arch.spapr_tce_tables, list) {
+                if (stt->liobn == args->liobn)
+                        return -EBUSY;
+        }
+
+        npages = kvmppc_stt_npages(args->window_size);
+
+        stt = kzalloc(sizeof(*stt) + npages* sizeof(struct page *),
+                      GFP_KERNEL);
+        if (!stt)
+                goto fail;
+
+        stt->liobn = args->liobn;
+        stt->window_size = args->window_size;
+        stt->kvm = kvm;
+
+        for (i = 0; i < npages; i++) {
+                stt->pages[i] = alloc_page(GFP_KERNEL | __GFP_ZERO);
+                if (!stt->pages[i])
+                        goto fail;
+        }
+
+        kvm_get_kvm(kvm);
+
+        mutex_lock(&kvm->lock);
+        list_add(&stt->list, &kvm->arch.spapr_tce_tables);
+
+        mutex_unlock(&kvm->lock);
+
+        return anon_inode_getfd("kvm-spapr-tce", &kvm_spapr_tce_fops,
+                                stt, O_RDWR);
+
+fail:
+        if (stt) {
+                for (i = 0; i < npages; i++)
+                        if (stt->pages[i])
+                                __free_page(stt->pages[i]);
+
+                kfree(stt);
+        }
+        return ret;
+}
+
 int kvmppc_core_prepare_memory_region(struct kvm *kvm,
                                 struct kvm_userspace_memory_region *mem)
 {
@@ -559,13 +669,17 @@ int kvmppc_core_init_vm(struct kvm *kvm)
 
         /* Allocate hashed page table */
         r = kvmppc_alloc_hpt(kvm);
+        if (r)
+                return r;
 
-        return r;
+        INIT_LIST_HEAD(&kvm->arch.spapr_tce_tables);
+        return 0;
 }
 
 void kvmppc_core_destroy_vm(struct kvm *kvm)
 {
         kvmppc_free_hpt(kvm);
+        WARN_ON(!list_empty(&kvm->arch.spapr_tce_tables));
 }
 
 /* These are stubs for now */
diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
index 319ff63b1f31..e6adaadcdff2 100644
--- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S
+++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
@@ -754,7 +754,7 @@ hcall_real_table:
         .long   0               /* 0x14 - H_CLEAR_REF */
         .long   .kvmppc_h_protect - hcall_real_table
         .long   0               /* 0x1c - H_GET_TCE */
-        .long   0               /* 0x20 - H_SET_TCE */
+        .long   .kvmppc_h_put_tce - hcall_real_table
         .long   0               /* 0x24 - H_SET_SPRG0 */
         .long   .kvmppc_h_set_dabr - hcall_real_table
         .long   0               /* 0x2c */
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index 6fc9ee499b61..c78ceb9d5605 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -203,6 +203,11 @@ int kvm_dev_ioctl_check_extension(long ext)
                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
                 break;
 #endif
+#ifdef CONFIG_KVM_BOOK3S_64_HV
+        case KVM_CAP_SPAPR_TCE:
+                r = 1;
+                break;
+#endif
         default:
                 r = 0;
                 break;
@@ -653,6 +658,19 @@ long kvm_arch_vm_ioctl(struct file *filp,
 
                 break;
         }
+#ifdef CONFIG_KVM_BOOK3S_64_HV
+        case KVM_CREATE_SPAPR_TCE: {
+                struct kvm_create_spapr_tce create_tce;
+                struct kvm *kvm = filp->private_data;
+
+                r = -EFAULT;
+                if (copy_from_user(&create_tce, argp, sizeof(create_tce)))
+                        goto out;
+                r = kvm_vm_ioctl_create_spapr_tce(kvm, &create_tce);
+                goto out;
+        }
+#endif /* CONFIG_KVM_BOOK3S_64_HV */
+
         default:
                 r = -ENOTTY;
         }
diff --git a/include/linux/kvm.h b/include/linux/kvm.h
index a156294fc22a..61f56502732e 100644
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -550,6 +550,7 @@ struct kvm_ppc_pvinfo {
 #define KVM_CAP_TSC_CONTROL 60
 #define KVM_CAP_GET_TSC_KHZ 61
 #define KVM_CAP_PPC_BOOKE_SREGS 62
+#define KVM_CAP_SPAPR_TCE 63
 
 #ifdef KVM_CAP_IRQ_ROUTING
 
@@ -752,6 +753,7 @@ struct kvm_clock_data {
 /* Available with KVM_CAP_XCRS */
 #define KVM_GET_XCRS              _IOR(KVMIO,  0xa6, struct kvm_xcrs)
 #define KVM_SET_XCRS              _IOW(KVMIO,  0xa7, struct kvm_xcrs)
+#define KVM_CREATE_SPAPR_TCE      _IOW(KVMIO,  0xa8, struct kvm_create_spapr_tce)
 
 #define KVM_DEV_ASSIGN_ENABLE_IOMMU     (1 << 0)