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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 09 of 12] Update memshr API and tools
tools/blktap2/drivers/tapdisk-vbd.c | 6 +-
tools/blktap2/drivers/tapdisk.h | 2 +-
tools/libxc/xc_memshr.c | 63 ++++++++++++++++++++++++++++++++++--
tools/libxc/xenctrl.h | 19 ++++++++++-
tools/memshr/bidir-daemon.c | 34 ++++++++++++++-----
tools/memshr/bidir-hash.h | 12 ++++--
tools/memshr/interface.c | 30 ++++++++++-------
tools/memshr/memshr.h | 11 +++++-
8 files changed, 139 insertions(+), 38 deletions(-)
This patch is the folded version of API updates, along with the associated tool
changes to ensure that the build is always consistent.
API updates:
- The source domain in the sharing calls is no longer assumed to be dom0.
- Previously, the mem sharing code would return an opaque handle to index
shared pages (and nominees) in its global hash table. By removing the hash
table, the handle becomes a version, to avoid sharing a stale version of a
page. Thus, libxc wrappers and tools need to be updated to recall the share
functions with the information needed to fetch the page (which they readily
have).
Tool updates:
The only (in-tree, that we know of) consumer of the mem sharing API is the
memshr tool. This is updated to use the new API.
Signed-off-by: Andres Lagar-Cavilla <andres@xxxxxxxxxxxxxxxx>
Signed-off-by: Adin Scannell <adin@xxxxxxxxxxx>
diff -r 288ac8cfea7f -r 2d6a14ce5b0e tools/blktap2/drivers/tapdisk-vbd.c
--- a/tools/blktap2/drivers/tapdisk-vbd.c
+++ b/tools/blktap2/drivers/tapdisk-vbd.c
@@ -1218,14 +1218,14 @@ __tapdisk_vbd_complete_td_request(td_vbd
#ifdef MEMSHR
if (treq.op == TD_OP_READ
&& td_flag_test(image->flags, TD_OPEN_RDONLY)) {
- uint64_t hnd = treq.memshr_hnd;
+ share_tuple_t hnd = treq.memshr_hnd;
uint16_t uid = image->memshr_id;
blkif_request_t *breq = &vreq->req;
uint64_t sec = tapdisk_vbd_breq_get_sector(breq, treq);
int secs = breq->seg[treq.sidx].last_sect -
breq->seg[treq.sidx].first_sect + 1;
- if (hnd != 0)
+ if (hnd.handle != 0)
memshr_vbd_complete_ro_request(hnd, uid,
sec, secs);
}
@@ -1297,7 +1297,7 @@ __tapdisk_vbd_reissue_td_request(td_vbd_
/* Reset memshr handle. This'll prevent
* memshr_vbd_complete_ro_request being called
*/
- treq.memshr_hnd = 0;
+ treq.memshr_hnd.handle = 0;
td_complete_request(treq, 0);
} else
td_queue_read(parent, treq);
diff -r 288ac8cfea7f -r 2d6a14ce5b0e tools/blktap2/drivers/tapdisk.h
--- a/tools/blktap2/drivers/tapdisk.h
+++ b/tools/blktap2/drivers/tapdisk.h
@@ -140,7 +140,7 @@ struct td_request {
void *private;
#ifdef MEMSHR
- uint64_t memshr_hnd;
+ share_tuple_t memshr_hnd;
#endif
};
diff -r 288ac8cfea7f -r 2d6a14ce5b0e tools/libxc/xc_memshr.c
--- a/tools/libxc/xc_memshr.c
+++ b/tools/libxc/xc_memshr.c
@@ -86,24 +86,79 @@ int xc_memshr_nominate_gref(xc_interface
return ret;
}
-int xc_memshr_share(xc_interface *xch,
- uint64_t source_handle,
- uint64_t client_handle)
+int xc_memshr_share_gfns(xc_interface *xch,
+ domid_t source_domain,
+ unsigned long source_gfn,
+ uint64_t source_handle,
+ domid_t client_domain,
+ unsigned long client_gfn,
+ uint64_t client_handle)
{
DECLARE_DOMCTL;
struct xen_domctl_mem_sharing_op *op;
domctl.cmd = XEN_DOMCTL_mem_sharing_op;
domctl.interface_version = XEN_DOMCTL_INTERFACE_VERSION;
- domctl.domain = 0;
+ domctl.domain = source_domain;
op = &(domctl.u.mem_sharing_op);
op->op = XEN_DOMCTL_MEM_EVENT_OP_SHARING_SHARE;
op->u.share.source_handle = source_handle;
+ op->u.share.source_gfn = source_gfn;
+ op->u.share.client_domain = client_domain;
+ op->u.share.client_gfn = client_gfn;
op->u.share.client_handle = client_handle;
return do_domctl(xch, &domctl);
}
+int xc_memshr_share_grefs(xc_interface *xch,
+ domid_t source_domain,
+ grant_ref_t source_gref,
+ uint64_t source_handle,
+ domid_t client_domain,
+ grant_ref_t client_gref,
+ uint64_t client_handle)
+{
+ DECLARE_DOMCTL;
+ struct xen_domctl_mem_sharing_op *op;
+
+ domctl.cmd = XEN_DOMCTL_mem_sharing_op;
+ domctl.interface_version = XEN_DOMCTL_INTERFACE_VERSION;
+ domctl.domain = source_domain;
+ op = &(domctl.u.mem_sharing_op);
+ op->op = XEN_DOMCTL_MEM_EVENT_OP_SHARING_SHARE;
+ op->u.share.source_handle = source_handle;
+ XEN_DOMCTL_MEM_SHARING_FIELD_MAKE_GREF(op->u.share.source_gfn,
source_gref);
+ op->u.share.client_domain = client_domain;
+ XEN_DOMCTL_MEM_SHARING_FIELD_MAKE_GREF(op->u.share.client_gfn,
client_gref);
+ op->u.share.client_handle = client_handle;
+
+ return do_domctl(xch, &domctl);
+}
+
+int xc_memshr_add_to_physmap(xc_interface *xch,
+ domid_t source_domain,
+ unsigned long source_gfn,
+ uint64_t source_handle,
+ domid_t client_domain,
+ unsigned long client_gfn)
+{
+ DECLARE_DOMCTL;
+ struct xen_domctl_mem_sharing_op *op;
+
+ domctl.cmd = XEN_DOMCTL_mem_sharing_op;
+ domctl.interface_version = XEN_DOMCTL_INTERFACE_VERSION;
+ domctl.domain = source_domain;
+ op = &(domctl.u.mem_sharing_op);
+ op->op = XEN_DOMCTL_MEM_EVENT_OP_SHARING_ADD_PHYSMAP;
+ op->u.share.source_gfn = source_gfn;
+ op->u.share.source_handle = source_handle;
+ op->u.share.client_gfn = client_gfn;
+ op->u.share.client_domain = client_domain;
+
+ return do_domctl(xch, &domctl);
+}
+
int xc_memshr_domain_resume(xc_interface *xch,
domid_t domid)
{
diff -r 288ac8cfea7f -r 2d6a14ce5b0e tools/libxc/xenctrl.h
--- a/tools/libxc/xenctrl.h
+++ b/tools/libxc/xenctrl.h
@@ -1894,9 +1894,26 @@ int xc_memshr_nominate_gref(xc_interface
domid_t domid,
grant_ref_t gref,
uint64_t *handle);
-int xc_memshr_share(xc_interface *xch,
+int xc_memshr_share_gfns(xc_interface *xch,
+ domid_t source_domain,
+ unsigned long source_gfn,
uint64_t source_handle,
+ domid_t client_domain,
+ unsigned long client_gfn,
uint64_t client_handle);
+int xc_memshr_share_grefs(xc_interface *xch,
+ domid_t source_domain,
+ grant_ref_t source_gref,
+ uint64_t source_handle,
+ domid_t client_domain,
+ grant_ref_t client_gref,
+ uint64_t client_handle);
+int xc_memshr_add_to_physmap(xc_interface *xch,
+ domid_t source_domain,
+ unsigned long source_gfn,
+ uint64_t source_handle,
+ domid_t client_domain,
+ unsigned long client_gfn);
int xc_memshr_domain_resume(xc_interface *xch,
domid_t domid);
int xc_memshr_debug_gfn(xc_interface *xch,
diff -r 288ac8cfea7f -r 2d6a14ce5b0e tools/memshr/bidir-daemon.c
--- a/tools/memshr/bidir-daemon.c
+++ b/tools/memshr/bidir-daemon.c
@@ -19,16 +19,25 @@
#include <pthread.h>
#include <inttypes.h>
#include <unistd.h>
+#include <errno.h>
#include "bidir-hash.h"
#include "memshr-priv.h"
static struct blockshr_hash *blks_hash;
+/* Callback in the iterator, remember this value, and leave */
+int find_one(vbdblk_t k, share_tuple_t v, void *priv)
+{
+ share_tuple_t *rv = (share_tuple_t *) priv;
+ *rv = v;
+ /* Break out of iterator loop */
+ return 1;
+}
+
void* bidir_daemon(void *unused)
{
uint32_t nr_ent, max_nr_ent, tab_size, max_load, min_load;
- static uint64_t shrhnd = 1;
while(1)
{
@@ -41,20 +50,30 @@ void* bidir_daemon(void *unused)
/* Remove some hints as soon as we get to 90% capacity */
if(10 * nr_ent > 9 * max_nr_ent)
{
- uint64_t next_remove = shrhnd;
+ share_tuple_t next_remove;
int to_remove;
int ret;
to_remove = 0.1 * max_nr_ent;
while(to_remove > 0)
{
- ret = blockshr_shrhnd_remove(blks_hash, next_remove, NULL);
- if(ret < 0)
+ /* We use the iterator to get one entry */
+ next_remove.handle = 0;
+ ret = blockshr_hash_iterator(blks_hash, find_one,
&next_remove);
+
+ if ( !ret )
+ if ( next_remove.handle == 0 )
+ ret = -ESRCH;
+
+ if ( !ret )
+ ret = blockshr_shrhnd_remove(blks_hash, next_remove, NULL);
+
+ if(ret <= 0)
{
/* We failed to remove an entry, because of a serious hash
* table error */
DPRINTF("Could not remove handle %"PRId64", error: %d\n",
- next_remove, ret);
+ next_remove.handle, ret);
/* Force to exit the loop early */
to_remove = 0;
} else
@@ -62,12 +81,7 @@ void* bidir_daemon(void *unused)
{
/* Managed to remove the entry. Note next_remove not
* incremented, in case there are duplicates */
- shrhnd = next_remove;
to_remove--;
- } else
- {
- /* Failed to remove, because there is no such handle */
- next_remove++;
}
}
}
diff -r 288ac8cfea7f -r 2d6a14ce5b0e tools/memshr/bidir-hash.h
--- a/tools/memshr/bidir-hash.h
+++ b/tools/memshr/bidir-hash.h
@@ -20,6 +20,7 @@
#define __BIDIR_HASH_H__
#include <stdint.h>
+#include <string.h>
#include "memshr-priv.h"
typedef struct vbdblk {
@@ -81,15 +82,16 @@ static int fgprtshr_mfn_cmp(uint32_t m1,
#undef BIDIR_VALUE
#undef BIDIR_KEY_T
#undef BIDIR_VALUE_T
+
/* TODO better hashes! */
static inline uint32_t blockshr_block_hash(vbdblk_t block)
{
return (uint32_t)(block.sec) ^ (uint32_t)(block.disk_id);
}
-static inline uint32_t blockshr_shrhnd_hash(uint64_t shrhnd)
+static inline uint32_t blockshr_shrhnd_hash(share_tuple_t shrhnd)
{
- return (uint32_t)shrhnd;
+ return ((uint32_t) shrhnd.handle);
}
static inline int blockshr_block_cmp(vbdblk_t b1, vbdblk_t b2)
@@ -97,15 +99,15 @@ static inline int blockshr_block_cmp(vbd
return (b1.sec == b2.sec) && (b1.disk_id == b2.disk_id);
}
-static inline int blockshr_shrhnd_cmp(uint64_t h1, uint64_t h2)
+static inline int blockshr_shrhnd_cmp(share_tuple_t h1, share_tuple_t h2)
{
- return (h1 == h2);
+ return ( !memcmp(&h1, &h2, sizeof(share_tuple_t)) );
}
#define BIDIR_NAME_PREFIX blockshr
#define BIDIR_KEY block
#define BIDIR_VALUE shrhnd
#define BIDIR_KEY_T vbdblk_t
-#define BIDIR_VALUE_T uint64_t
+#define BIDIR_VALUE_T share_tuple_t
#include "bidir-namedefs.h"
#endif /* BLOCK_MAP */
diff -r 288ac8cfea7f -r 2d6a14ce5b0e tools/memshr/interface.c
--- a/tools/memshr/interface.c
+++ b/tools/memshr/interface.c
@@ -145,16 +145,17 @@ void memshr_vbd_image_put(uint16_t memsh
int memshr_vbd_issue_ro_request(char *buf,
grant_ref_t gref,
- uint16_t file_id,
+ uint16_t file_id,
uint64_t sec,
int secs,
- uint64_t *hnd)
+ share_tuple_t *hnd)
{
vbdblk_t blk;
- uint64_t s_hnd, c_hnd;
+ share_tuple_t source_st, client_st;
+ uint64_t c_hnd;
int ret;
- *hnd = 0;
+ *hnd = (share_tuple_t){ 0, 0, 0 };
if(!vbd_info.enabled)
return -1;
@@ -169,26 +170,31 @@ int memshr_vbd_issue_ro_request(char *bu
/* If page couldn't be made sharable, we cannot do anything about it */
if(ret != 0)
return -3;
- *hnd = c_hnd;
+
+ client_st = (share_tuple_t){ vbd_info.domid, gref, c_hnd };
+ *hnd = client_st;
/* Check if we've read matching disk block previously */
blk.sec = sec;
blk.disk_id = file_id;
- if(blockshr_block_lookup(memshr.blks, blk, &s_hnd) > 0)
+ if(blockshr_block_lookup(memshr.blks, blk, &source_st) > 0)
{
- ret = xc_memshr_share(vbd_info.xc_handle, s_hnd, c_hnd);
+ ret = xc_memshr_share_grefs(vbd_info.xc_handle, source_st.domain,
source_st.frame,
+ source_st.handle, vbd_info.domid, gref,
c_hnd);
if(!ret) return 0;
/* Handles failed to be shared => at least one of them must be invalid,
remove the relevant ones from the map */
switch(ret)
{
case XEN_DOMCTL_MEM_SHARING_S_HANDLE_INVALID:
- ret = blockshr_shrhnd_remove(memshr.blks, s_hnd, NULL);
- if(ret) DPRINTF("Could not rm invl s_hnd: %"PRId64"\n", s_hnd);
+ ret = blockshr_shrhnd_remove(memshr.blks, source_st, NULL);
+ if(ret) DPRINTF("Could not rm invl s_hnd: %u %"PRId64"
%"PRId64"\n",
+ source_st.domain, source_st.frame,
source_st.handle);
break;
case XEN_DOMCTL_MEM_SHARING_C_HANDLE_INVALID:
- ret = blockshr_shrhnd_remove(memshr.blks, c_hnd, NULL);
- if(ret) DPRINTF("Could not rm invl c_hnd: %"PRId64"\n", c_hnd);
+ ret = blockshr_shrhnd_remove(memshr.blks, client_st, NULL);
+ if(ret) DPRINTF("Could not rm invl c_hnd: %u %"PRId64"
%"PRId64"\n",
+ client_st.domain, client_st.frame,
client_st.handle);
break;
default:
break;
@@ -199,7 +205,7 @@ int memshr_vbd_issue_ro_request(char *bu
return -4;
}
-void memshr_vbd_complete_ro_request(uint64_t hnd,
+void memshr_vbd_complete_ro_request(share_tuple_t hnd,
uint16_t file_id,
uint64_t sec,
int secs)
diff -r 288ac8cfea7f -r 2d6a14ce5b0e tools/memshr/memshr.h
--- a/tools/memshr/memshr.h
+++ b/tools/memshr/memshr.h
@@ -25,6 +25,13 @@
typedef uint64_t xen_mfn_t;
+typedef struct share_tuple
+{
+ uint32_t domain;
+ uint64_t frame;
+ uint64_t handle;
+} share_tuple_t;
+
extern void memshr_set_domid(int domid);
extern void memshr_daemon_initialize(void);
extern void memshr_vbd_initialize(void);
@@ -35,9 +42,9 @@ extern int memshr_vbd_issue_ro_request(c
uint16_t file_id,
uint64_t sec,
int secs,
- uint64_t *hnd);
+ share_tuple_t *hnd);
extern void memshr_vbd_complete_ro_request(
- uint64_t hnd,
+ share_tuple_t hnd,
uint16_t file_id,
uint64_t sec,
int secs);
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