[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[Xen-devel] [PATCH v1 1/5] xen/libcx/tmem: Replace TMEM_RESTORE_NEW with XEN_SYSCTL_TMEM_OP_SET_POOLS



This used to be done under TMEM_RESTORE_NEW which was an hypercall
accessible by the guest. However there are couple of reasons
not to do it:
 - No checking of domid on TMEM_RESTORE_NEW which meant that
   any guest could create TMEM pools for other guests.
 - The guest can already create pools using TMEM_NEW_POOL
   (which is limited to guest doing the hypercall)
 - This functionality is only needed during migration - there
   is no need for the guest to have this functionality.

However to move this we also have to allocate the 'struct domain'
->tmem pointer. It is by default set to NULL and would be initialized
via the guest do_tmem() hypercalls. Presumarily that was the
initial reason that TMEM_RESTORE_NEW was in the guest accessible
hypercalls.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>

---
Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Cc: Wei Liu <wei.liu2@xxxxxxxxxx>
---
 tools/libxc/xc_tmem.c          | 22 ++++++++++---------
 xen/common/tmem.c              | 15 +++++--------
 xen/common/tmem_control.c      | 49 ++++++++++++++++++++++++++++++++++++++++++
 xen/include/public/sysctl.h    |  1 +
 xen/include/public/tmem.h      |  5 +++--
 xen/include/xen/tmem_control.h |  4 ++++
 xen/include/xen/tmem_xen.h     |  1 -
 7 files changed, 74 insertions(+), 23 deletions(-)

diff --git a/tools/libxc/xc_tmem.c b/tools/libxc/xc_tmem.c
index 51d11ef..181de48 100644
--- a/tools/libxc/xc_tmem.c
+++ b/tools/libxc/xc_tmem.c
@@ -385,16 +385,18 @@ static int xc_tmem_restore_new_pool(
                     uint64_t uuid_lo,
                     uint64_t uuid_hi)
 {
-    tmem_op_t op;
-
-    op.cmd = TMEM_RESTORE_NEW;
-    op.pool_id = pool_id;
-    op.u.creat.arg1 = cli_id;
-    op.u.creat.flags = flags;
-    op.u.creat.uuid[0] = uuid_lo;
-    op.u.creat.uuid[1] = uuid_hi;
-
-    return do_tmem_op(xch, &op);
+    xen_tmem_pool_info_t pool = {
+        .flags.raw = flags,
+        .id = pool_id,
+        .n_pages = 0,
+        .uuid[0] = uuid_lo,
+        .uuid[1] = uuid_hi,
+    };
+
+    return xc_tmem_control(xch, pool_id,
+                           XEN_SYSCTL_TMEM_OP_SET_POOLS,
+                           cli_id, sizeof(pool),
+                           0 /* arg */, &pool);
 }
 
 int xc_tmem_restore(xc_interface *xch, int dom, int io_fd)
diff --git a/xen/common/tmem.c b/xen/common/tmem.c
index 6d5de5b..b92793d 100644
--- a/xen/common/tmem.c
+++ b/xen/common/tmem.c
@@ -804,7 +804,7 @@ static void pool_flush(struct tmem_pool *pool, domid_t 
cli_id)
 
 /************ CLIENT MANIPULATION OPERATIONS **************************/
 
-static struct client *client_create(domid_t cli_id)
+struct client *client_create(domid_t cli_id)
 {
     struct client *client = xzalloc(struct client);
     int i, shift;
@@ -1435,9 +1435,9 @@ static int do_tmem_destroy_pool(uint32_t pool_id)
     return 1;
 }
 
-static int do_tmem_new_pool(domid_t this_cli_id,
-                                     uint32_t d_poolid, uint32_t flags,
-                                     uint64_t uuid_lo, uint64_t uuid_hi)
+int do_tmem_new_pool(domid_t this_cli_id,
+                     uint32_t d_poolid, uint32_t flags,
+                     uint64_t uuid_lo, uint64_t uuid_hi)
 {
     struct client *client;
     domid_t cli_id;
@@ -1908,7 +1908,7 @@ long do_tmem_op(tmem_cli_op_t uops)
     /* Acquire write lock for all commands at first. */
     write_lock(&tmem_rwlock);
 
-    if ( op.cmd == TMEM_CONTROL )
+    if ( op.cmd == TMEM_CONTROL || op.cmd == TMEM_RESTORE_NEW )
     {
         rc = -EOPNOTSUPP;
     }
@@ -1917,11 +1917,6 @@ long do_tmem_op(tmem_cli_op_t uops)
         rc = tmemc_shared_pool_auth(op.u.creat.arg1,op.u.creat.uuid[0],
                          op.u.creat.uuid[1],op.u.creat.flags);
     }
-    else if ( op.cmd == TMEM_RESTORE_NEW )
-    {
-        rc = do_tmem_new_pool(op.u.creat.arg1, op.pool_id, op.u.creat.flags,
-                         op.u.creat.uuid[0], op.u.creat.uuid[1]);
-    }
     else {
     /*
         * For other commands, create per-client tmem structure dynamically on
diff --git a/xen/common/tmem_control.c b/xen/common/tmem_control.c
index ddd9cfe..fc09814 100644
--- a/xen/common/tmem_control.c
+++ b/xen/common/tmem_control.c
@@ -402,6 +402,52 @@ static int tmemc_get_pool(int cli_id,
     return rc ? : idx;
 }
 
+static int tmemc_set_pools(int cli_id,
+                           XEN_GUEST_HANDLE(xen_tmem_pool_info_t) pools,
+                           uint32_t len)
+{
+    unsigned int i, idx;
+    int rc = 0;
+    unsigned int nr = len / sizeof(xen_tmem_pool_info_t);
+    struct client *client = tmem_client_from_cli_id(cli_id);
+
+    if ( len % sizeof(xen_tmem_pool_info_t) )
+        return -EINVAL;
+
+    if ( nr > MAX_POOLS_PER_DOMAIN )
+        return -E2BIG;
+
+    if ( !guest_handle_okay(pools, nr) )
+        return -EINVAL;
+
+    if ( !client )
+    {
+        client = client_create(cli_id);
+        if ( !client )
+            return -ENOMEM;
+    }
+    for ( idx = 0, i = 0; i < nr; i++ )
+    {
+        xen_tmem_pool_info_t pool;
+
+        if ( __copy_from_guest_offset(&pool, pools, i, 1 ) )
+            return -EFAULT;
+
+        rc = do_tmem_new_pool(cli_id, pool.id, pool.flags.raw,
+                              pool.uuid[0], pool.uuid[1]);
+        if ( rc < 0 )
+            break;
+
+        pool.id = rc;
+        if ( __copy_to_guest_offset(pools, idx, &pool, 1) )
+            return -EFAULT;
+        idx++;
+    }
+
+    /* And how many we have processed. */
+    return rc ? : idx;
+}
+
 int tmem_control(struct xen_sysctl_tmem_op *op)
 {
     int ret;
@@ -438,6 +484,9 @@ int tmem_control(struct xen_sysctl_tmem_op *op)
     case XEN_SYSCTL_TMEM_OP_GET_POOLS:
         ret = tmemc_get_pool(op->cli_id, op->u.pool, op->len);
         break;
+    case XEN_SYSCTL_TMEM_OP_SET_POOLS: /* TMEM_RESTORE_NEW */
+        ret = tmemc_set_pools(op->cli_id, op->u.pool, op->len);
+        break;
     default:
         ret = do_tmem_control(op);
         break;
diff --git a/xen/include/public/sysctl.h b/xen/include/public/sysctl.h
index 00f5e77..74a7462 100644
--- a/xen/include/public/sysctl.h
+++ b/xen/include/public/sysctl.h
@@ -770,6 +770,7 @@ DEFINE_XEN_GUEST_HANDLE(xen_sysctl_psr_cat_op_t);
 #define XEN_SYSCTL_TMEM_OP_SET_CLIENT_INFO        6
 #define XEN_SYSCTL_TMEM_OP_GET_POOLS              7
 #define XEN_SYSCTL_TMEM_OP_QUERY_FREEABLE_MB      8
+#define XEN_SYSCTL_TMEM_OP_SET_POOLS              9
 #define XEN_SYSCTL_TMEM_OP_SAVE_BEGIN             10
 #define XEN_SYSCTL_TMEM_OP_SAVE_GET_NEXT_PAGE     19
 #define XEN_SYSCTL_TMEM_OP_SAVE_GET_NEXT_INV      20
diff --git a/xen/include/public/tmem.h b/xen/include/public/tmem.h
index 2d805fb..b9f3537 100644
--- a/xen/include/public/tmem.h
+++ b/xen/include/public/tmem.h
@@ -53,7 +53,8 @@
 
 /* Privileged commands to HYPERVISOR_tmem_op() */
 #define TMEM_AUTH                 101
-#define TMEM_RESTORE_NEW          102
+#define TMEM_RESTORE_NEW          102 /* Now called via XEN_SYSCTL_tmem_op as
+                                         XEN_SYSCTL_TMEM_OP_SET_POOL. */
 
 /* Bits for HYPERVISOR_tmem_op(TMEM_NEW_POOL) */
 #define TMEM_POOL_PERSIST          1
@@ -92,7 +93,7 @@ struct tmem_op {
             uint64_t uuid[2];
             uint32_t flags;
             uint32_t arg1;
-        } creat; /* for cmd == TMEM_NEW_POOL, TMEM_AUTH, TMEM_RESTORE_NEW */
+        } creat; /* for cmd == TMEM_NEW_POOL, TMEM_AUTH */
         struct {
 #if __XEN_INTERFACE_VERSION__ < 0x00040600
             uint64_t oid[3];
diff --git a/xen/include/xen/tmem_control.h b/xen/include/xen/tmem_control.h
index 44bc07f..91c185e 100644
--- a/xen/include/xen/tmem_control.h
+++ b/xen/include/xen/tmem_control.h
@@ -18,6 +18,10 @@ extern rwlock_t tmem_rwlock;
 int tmem_evict(void);
 int do_tmem_control(struct xen_sysctl_tmem_op *op);
 
+struct client *client_create(domid_t cli_id);
+int do_tmem_new_pool(domid_t this_cli_id, uint32_t d_poolid, uint32_t flags,
+                     uint64_t uuid_lo, uint64_t uuid_hi);
+
 #endif /* CONFIG_TMEM */
 
 #endif /* __XEN_TMEM_CONTROL_H__ */
diff --git a/xen/include/xen/tmem_xen.h b/xen/include/xen/tmem_xen.h
index 13cf7bc..b6bd61b 100644
--- a/xen/include/xen/tmem_xen.h
+++ b/xen/include/xen/tmem_xen.h
@@ -199,7 +199,6 @@ static inline int tmem_get_tmemop_from_client(tmem_op_t 
*op, tmem_cli_op_t uops)
         {
         case TMEM_NEW_POOL:   u = XLAT_tmem_op_u_creat; break;
         case TMEM_AUTH:       u = XLAT_tmem_op_u_creat; break;
-        case TMEM_RESTORE_NEW:u = XLAT_tmem_op_u_creat; break;
         default:              u = XLAT_tmem_op_u_gen ;  break;
         }
         XLAT_tmem_op(op, &cop);
-- 
2.7.4


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
https://lists.xen.org/xen-devel

 


Rackspace

Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.