[Qemu-devel] [PATCH 0/7] tests: virtio-9p: test request cancellation

[Qemu-devel] [PATCH 0/7] tests: virtio-9p: test request cancellation

[Greg Kurz]

This series does several changes to virtio-9p-test in order to be able
to test request cancellation (flush in 9p wording):

patches 1-2: preparatory work, basically doing things in the test code,
             rather that in the common code for flexibility and clarity

patch 3: the cornerstone of the series, switch to using the synth fsdev
         backend, which allows to associate specific write/read ops to
         a given file. Since this backend never got used since it was
         merged, it looks like an ideal vehicle to add QTEST aware code
         in QEMU

patches 4-5: trivial open & write tests, since the flush test will need
             to open a file and write to it

patch 6: another important patch that allows to know the length written
         by the guest into a used buffer 

patch 7: the goal of this series, two request cancellation tests

This series depends on the following patch:

https://lists.nongnu.org/archive/html/qemu-devel/2018-01/msg05604.html

Please comment.

Cheers,

--
Greg

---

Greg Kurz (7):
      tests: virtio-9p: move request tag to the test functions
      tests: virtio-9p: wait for completion in the test code
      tests: virtio-9p: use the synth backend
      tests: virtio-9p: add LOPEN operation test
      tests: virtio-9p: add WRITE operation test
      libqos/virtio: return length written into used descriptor
      tests: virtio-9p: add FLUSH operation test


 hw/9pfs/9p-synth.c       |   56 ++++++++++
 hw/9pfs/9p-synth.h       |   11 ++
 hw/9pfs/9p.c             |    1 
 tests/libqos/virtio.c    |   25 +++-
 tests/libqos/virtio.h    |    3 -
 tests/virtio-9p-test.c   |  263 ++++++++++++++++++++++++++++++++++++++++------
 tests/virtio-blk-test.c  |   24 ++--
 tests/virtio-net-test.c  |    6 +
 tests/virtio-scsi-test.c |    3 -
 9 files changed, 335 insertions(+), 57 deletions(-)

[Qemu-devel] [PATCH 1/7] tests: virtio-9p: move request tag to the test functions

[Greg Kurz]

It doesn't really makes sense to hide the request tag from the test
functions. It prevents to test the 9p server behavior when passed
a wrong tag (ie, still in use or different from P9_NOTAG for a
version request). Also the spec says that a tag is reusable as soon
as the corresponding request was replied or flushed: no need to
always increment tags like we do now. And finaly, an upcoming test
of the flush command will need to manipulate tags explicitely.

This simply changes all request functions to have a tag argument.
Except for the version request which needs P9_NOTAG, all other
tests can pass 0 since they wait for the reply before sending
another request.

Signed-off-by: Greg Kurz <groug@kaod.org>
---
 tests/virtio-9p-test.c |   28 ++++++++++++++--------------
 1 file changed, 14 insertions(+), 14 deletions(-)

diff --git a/tests/virtio-9p-test.c b/tests/virtio-9p-test.c
index 00f00f7246e9..5ada2839b9ae 100644
--- a/tests/virtio-9p-test.c
+++ b/tests/virtio-9p-test.c
@@ -27,7 +27,6 @@ typedef struct {
     QOSState *qs;
     QVirtQueue *vq;
     char *test_share;
-    uint16_t p9_req_tag;
 } QVirtIO9P;
 
 static QVirtIO9P *qvirtio_9p_start(const char *driver)
@@ -294,10 +293,11 @@ static void v9fs_rlerror(P9Req *req, uint32_t *err)
 }
 
 /* size[4] Tversion tag[2] msize[4] version[s] */
-static P9Req *v9fs_tversion(QVirtIO9P *v9p, uint32_t msize, const char *version)
+static P9Req *v9fs_tversion(QVirtIO9P *v9p, uint32_t msize, const char *version,
+                            uint16_t tag)
 {
     P9Req *req = v9fs_req_init(v9p, 4 + v9fs_string_size(version), P9_TVERSION,
-                               P9_NOTAG);
+                               tag);
 
     v9fs_uint32_write(req, msize);
     v9fs_string_write(req, version);
@@ -323,12 +323,12 @@ static void v9fs_rversion(P9Req *req, uint16_t *len, char **version)
 }
 
 /* size[4] Tattach tag[2] fid[4] afid[4] uname[s] aname[s] n_uname[4] */
-static P9Req *v9fs_tattach(QVirtIO9P *v9p, uint32_t fid, uint32_t n_uname)
+static P9Req *v9fs_tattach(QVirtIO9P *v9p, uint32_t fid, uint32_t n_uname,
+                           uint16_t tag)
 {
     const char *uname = ""; /* ignored by QEMU */
     const char *aname = ""; /* ignored by QEMU */
-    P9Req *req = v9fs_req_init(v9p, 4 + 4 + 2 + 2 + 4, P9_TATTACH,
-                               ++(v9p->p9_req_tag));
+    P9Req *req = v9fs_req_init(v9p, 4 + 4 + 2 + 2 + 4, P9_TATTACH, tag);
 
     v9fs_uint32_write(req, fid);
     v9fs_uint32_write(req, P9_NOFID);
@@ -353,7 +353,7 @@ static void v9fs_rattach(P9Req *req, v9fs_qid *qid)
 
 /* size[4] Twalk tag[2] fid[4] newfid[4] nwname[2] nwname*(wname[s]) */
 static P9Req *v9fs_twalk(QVirtIO9P *v9p, uint32_t fid, uint32_t newfid,
-                         uint16_t nwname, char *const wnames[])
+                         uint16_t nwname, char *const wnames[], uint16_t tag)
 {
     P9Req *req;
     int i;
@@ -362,7 +362,7 @@ static P9Req *v9fs_twalk(QVirtIO9P *v9p, uint32_t fid, uint32_t newfid,
     for (i = 0; i < nwname; i++) {
         size += v9fs_string_size(wnames[i]);
     }
-    req = v9fs_req_init(v9p,  size, P9_TWALK, ++(v9p->p9_req_tag));
+    req = v9fs_req_init(v9p,  size, P9_TWALK, tag);
     v9fs_uint32_write(req, fid);
     v9fs_uint32_write(req, newfid);
     v9fs_uint16_write(req, nwname);
@@ -397,7 +397,7 @@ static void fs_version(QVirtIO9P *v9p)
     char *server_version;
     P9Req *req;
 
-    req = v9fs_tversion(v9p, P9_MAX_SIZE, version);
+    req = v9fs_tversion(v9p, P9_MAX_SIZE, version, P9_NOTAG);
     v9fs_rversion(req, &server_len, &server_version);
 
     g_assert_cmpmem(server_version, server_len, version, strlen(version));
@@ -410,7 +410,7 @@ static void fs_attach(QVirtIO9P *v9p)
     P9Req *req;
 
     fs_version(v9p);
-    req = v9fs_tattach(v9p, 0, getuid());
+    req = v9fs_tattach(v9p, 0, getuid(), 0);
     v9fs_rattach(req, NULL);
 }
 
@@ -430,7 +430,7 @@ static void fs_walk(QVirtIO9P *v9p)
     }
 
     fs_attach(v9p);
-    req = v9fs_twalk(v9p, 0, 1, P9_MAXWELEM, wnames);
+    req = v9fs_twalk(v9p, 0, 1, P9_MAXWELEM, wnames, 0);
     v9fs_rwalk(req, &nwqid, &wqid);
 
     g_assert_cmpint(nwqid, ==, P9_MAXWELEM);
@@ -451,7 +451,7 @@ static void fs_walk_no_slash(QVirtIO9P *v9p)
     uint32_t err;
 
     fs_attach(v9p);
-    req = v9fs_twalk(v9p, 0, 1, 1, wnames);
+    req = v9fs_twalk(v9p, 0, 1, 1, wnames, 0);
     v9fs_rlerror(req, &err);
 
     g_assert_cmpint(err, ==, ENOENT);
@@ -466,10 +466,10 @@ static void fs_walk_dotdot(QVirtIO9P *v9p)
     P9Req *req;
 
     fs_version(v9p);
-    req = v9fs_tattach(v9p, 0, getuid());
+    req = v9fs_tattach(v9p, 0, getuid(), 0);
     v9fs_rattach(req, &root_qid);
 
-    req = v9fs_twalk(v9p, 0, 1, 1, wnames);
+    req = v9fs_twalk(v9p, 0, 1, 1, wnames, 0);
     v9fs_rwalk(req, NULL, &wqid); /* We now we'll get one qid */
 
     g_assert_cmpmem(&root_qid, 13, wqid[0], 13);

[Qemu-devel] [PATCH 2/7] tests: virtio-9p: wait for completion in the test code

[Greg Kurz]

In order to test request cancellation, we will need to send multiple
requests and wait for the associated replies. Since we poll the ISR
to know if a request completed, we may have several replies to parse
when we detect ISR was set to 1.

This patch moves the waiting out of the reply parsing path, up into
the functional tests.

Signed-off-by: Greg Kurz <groug@kaod.org>
---
 tests/virtio-9p-test.c |   14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/tests/virtio-9p-test.c b/tests/virtio-9p-test.c
index 5ada2839b9ae..cb086315a36e 100644
--- a/tests/virtio-9p-test.c
+++ b/tests/virtio-9p-test.c
@@ -246,13 +246,17 @@ static const char *rmessage_name(uint8_t id)
         "<unknown>";
 }
 
-static void v9fs_req_recv(P9Req *req, uint8_t id)
+static void v9fs_req_wait_for_reply(P9Req *req)
 {
     QVirtIO9P *v9p = req->v9p;
-    P9Hdr hdr;
 
     qvirtio_wait_used_elem(v9p->dev, v9p->vq, req->free_head,
                            QVIRTIO_9P_TIMEOUT_US);
+}
+
+static void v9fs_req_recv(P9Req *req, uint8_t id)
+{
+    P9Hdr hdr;
 
     v9fs_memread(req, &hdr, 7);
     hdr.size = ldl_le_p(&hdr.size);
@@ -398,6 +402,7 @@ static void fs_version(QVirtIO9P *v9p)
     P9Req *req;
 
     req = v9fs_tversion(v9p, P9_MAX_SIZE, version, P9_NOTAG);
+    v9fs_req_wait_for_reply(req);
     v9fs_rversion(req, &server_len, &server_version);
 
     g_assert_cmpmem(server_version, server_len, version, strlen(version));
@@ -411,6 +416,7 @@ static void fs_attach(QVirtIO9P *v9p)
 
     fs_version(v9p);
     req = v9fs_tattach(v9p, 0, getuid(), 0);
+    v9fs_req_wait_for_reply(req);
     v9fs_rattach(req, NULL);
 }
 
@@ -431,6 +437,7 @@ static void fs_walk(QVirtIO9P *v9p)
 
     fs_attach(v9p);
     req = v9fs_twalk(v9p, 0, 1, P9_MAXWELEM, wnames, 0);
+    v9fs_req_wait_for_reply(req);
     v9fs_rwalk(req, &nwqid, &wqid);
 
     g_assert_cmpint(nwqid, ==, P9_MAXWELEM);
@@ -452,6 +459,7 @@ static void fs_walk_no_slash(QVirtIO9P *v9p)
 
     fs_attach(v9p);
     req = v9fs_twalk(v9p, 0, 1, 1, wnames, 0);
+    v9fs_req_wait_for_reply(req);
     v9fs_rlerror(req, &err);
 
     g_assert_cmpint(err, ==, ENOENT);
@@ -467,9 +475,11 @@ static void fs_walk_dotdot(QVirtIO9P *v9p)
 
     fs_version(v9p);
     req = v9fs_tattach(v9p, 0, getuid(), 0);
+    v9fs_req_wait_for_reply(req);
     v9fs_rattach(req, &root_qid);
 
     req = v9fs_twalk(v9p, 0, 1, 1, wnames, 0);
+    v9fs_req_wait_for_reply(req);
     v9fs_rwalk(req, NULL, &wqid); /* We now we'll get one qid */
 
     g_assert_cmpmem(&root_qid, 13, wqid[0], 13);

[Qemu-devel] [PATCH 3/7] tests: virtio-9p: use the synth backend

[Greg Kurz]

The purpose of virtio-9p-test is to test the virtio-9p device, especially
the 9p server state machine. We don't really care what fsdev backend we're
using. Moreover, if we want to be able to test the flush request or a
device reset with in-flights I/O, it is close to impossible to achieve
with a physical backend because we cannot ask it reliably to put an I/O
on hold at a specific point in time.

Fortunately, we can do that with the synthetic backend, which allows to
register callbacks on read/write accesses to a specific file. This will
be used by a later patch to test the 9P flush request.

The walk request test is converted to using the synth backend.

Signed-off-by: Greg Kurz <groug@kaod.org>
---
 hw/9pfs/9p-synth.c     |   16 ++++++++++++++++
 hw/9pfs/9p-synth.h     |    4 ++++
 tests/virtio-9p-test.c |   22 ++++++----------------
 3 files changed, 26 insertions(+), 16 deletions(-)

diff --git a/hw/9pfs/9p-synth.c b/hw/9pfs/9p-synth.c
index 8f255e91c00f..dcbd320da17a 100644
--- a/hw/9pfs/9p-synth.c
+++ b/hw/9pfs/9p-synth.c
@@ -19,6 +19,7 @@
 #include "qemu/rcu.h"
 #include "qemu/rcu_queue.h"
 #include "qemu/cutils.h"
+#include "sysemu/qtest.h"
 
 /* Root node for synth file system */
 static V9fsSynthNode synth_root = {
@@ -527,6 +528,21 @@ static int synth_init(FsContext *ctx, Error **errp)
 
     /* Mark the subsystem is ready for use */
     synth_fs = 1;
+
+    if (qtest_enabled()) {
+        V9fsSynthNode *node = NULL;
+        int i, ret;
+
+        /* Directory hierarchy for WALK test */
+        for (i = 0; i < P9_MAXWELEM; i++) {
+            char *name = g_strdup_printf(QTEST_V9FS_SYNTH_WALK_FILE, i);
+
+            ret = qemu_v9fs_synth_mkdir(node, 0700, name, &node);
+            assert(!ret);
+            g_free(name);
+        }
+    }
+
     return 0;
 }
 
diff --git a/hw/9pfs/9p-synth.h b/hw/9pfs/9p-synth.h
index 49c2fc7b274e..876b4ef58288 100644
--- a/hw/9pfs/9p-synth.h
+++ b/hw/9pfs/9p-synth.h
@@ -49,4 +49,8 @@ int qemu_v9fs_synth_add_file(V9fsSynthNode *parent, int mode,
                              const char *name, v9fs_synth_read read,
                              v9fs_synth_write write, void *arg);
 
+/* qtest stuff */
+
+#define QTEST_V9FS_SYNTH_WALK_FILE "WALK%d"
+
 #endif
diff --git a/tests/virtio-9p-test.c b/tests/virtio-9p-test.c
index cb086315a36e..652198156731 100644
--- a/tests/virtio-9p-test.c
+++ b/tests/virtio-9p-test.c
@@ -17,6 +17,7 @@
 #include "standard-headers/linux/virtio_ids.h"
 #include "standard-headers/linux/virtio_pci.h"
 #include "hw/9pfs/9p.h"
+#include "hw/9pfs/9p-synth.h"
 
 #define QVIRTIO_9P_TIMEOUT_US (10 * 1000 * 1000)
 
@@ -26,23 +27,19 @@ typedef struct {
     QVirtioDevice *dev;
     QOSState *qs;
     QVirtQueue *vq;
-    char *test_share;
 } QVirtIO9P;
 
 static QVirtIO9P *qvirtio_9p_start(const char *driver)
 {
     const char *arch = qtest_get_arch();
-    const char *cmd = "-fsdev local,id=fsdev0,security_model=none,path=%s "
+    const char *cmd = "-fsdev synth,id=fsdev0 "
                       "-device %s,fsdev=fsdev0,mount_tag=%s";
     QVirtIO9P *v9p = g_new0(QVirtIO9P, 1);
 
-    v9p->test_share = g_strdup("/tmp/qtest.XXXXXX");
-    g_assert_nonnull(mkdtemp(v9p->test_share));
-
     if (strcmp(arch, "i386") == 0 || strcmp(arch, "x86_64") == 0) {
-        v9p->qs = qtest_pc_boot(cmd, v9p->test_share, driver, mount_tag);
+        v9p->qs = qtest_pc_boot(cmd, driver, mount_tag);
     } else if (strcmp(arch, "ppc64") == 0) {
-        v9p->qs = qtest_spapr_boot(cmd, v9p->test_share, driver, mount_tag);
+        v9p->qs = qtest_spapr_boot(cmd, driver, mount_tag);
     } else {
         g_printerr("virtio-9p tests are only available on x86 or ppc64\n");
         exit(EXIT_FAILURE);
@@ -54,8 +51,6 @@ static QVirtIO9P *qvirtio_9p_start(const char *driver)
 static void qvirtio_9p_stop(QVirtIO9P *v9p)
 {
     qtest_shutdown(v9p->qs);
-    rmdir(v9p->test_share);
-    g_free(v9p->test_share);
     g_free(v9p);
 }
 
@@ -422,17 +417,14 @@ static void fs_attach(QVirtIO9P *v9p)
 
 static void fs_walk(QVirtIO9P *v9p)
 {
-    char *wnames[P9_MAXWELEM], *paths[P9_MAXWELEM];
-    char *last_path = v9p->test_share;
+    char *wnames[P9_MAXWELEM];
     uint16_t nwqid;
     v9fs_qid *wqid;
     int i;
     P9Req *req;
 
     for (i = 0; i < P9_MAXWELEM; i++) {
-        wnames[i] = g_strdup_printf("%s%d", __func__, i);
-        last_path = paths[i] = g_strdup_printf("%s/%s", last_path, wnames[i]);
-        g_assert(!mkdir(paths[i], 0700));
+        wnames[i] = g_strdup_printf(QTEST_V9FS_SYNTH_WALK_FILE, i);
     }
 
     fs_attach(v9p);
@@ -443,8 +435,6 @@ static void fs_walk(QVirtIO9P *v9p)
     g_assert_cmpint(nwqid, ==, P9_MAXWELEM);
 
     for (i = 0; i < P9_MAXWELEM; i++) {
-        rmdir(paths[P9_MAXWELEM - i - 1]);
-        g_free(paths[P9_MAXWELEM - i - 1]);
         g_free(wnames[i]);
     }
 

[Qemu-devel] [PATCH 4/7] tests: virtio-9p: add LOPEN operation test

[Greg Kurz]

Trivial test of a successful open.

Signed-off-by: Greg Kurz <groug@kaod.org>
---
 hw/9pfs/9p-synth.c     |    5 +++++
 hw/9pfs/9p-synth.h     |    1 +
 tests/virtio-9p-test.c |   47 +++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 53 insertions(+)

diff --git a/hw/9pfs/9p-synth.c b/hw/9pfs/9p-synth.c
index dcbd320da17a..f17b74f44461 100644
--- a/hw/9pfs/9p-synth.c
+++ b/hw/9pfs/9p-synth.c
@@ -541,6 +541,11 @@ static int synth_init(FsContext *ctx, Error **errp)
             assert(!ret);
             g_free(name);
         }
+
+        /* File for LOPEN test */
+        ret = qemu_v9fs_synth_add_file(NULL, 0, QTEST_V9FS_SYNTH_LOPEN_FILE,
+                                       NULL, NULL, ctx);
+        assert(!ret);
     }
 
     return 0;
diff --git a/hw/9pfs/9p-synth.h b/hw/9pfs/9p-synth.h
index 876b4ef58288..2a8d6fd00d69 100644
--- a/hw/9pfs/9p-synth.h
+++ b/hw/9pfs/9p-synth.h
@@ -52,5 +52,6 @@ int qemu_v9fs_synth_add_file(V9fsSynthNode *parent, int mode,
 /* qtest stuff */
 
 #define QTEST_V9FS_SYNTH_WALK_FILE "WALK%d"
+#define QTEST_V9FS_SYNTH_LOPEN_FILE "LOPEN"
 
 #endif
diff --git a/tests/virtio-9p-test.c b/tests/virtio-9p-test.c
index 652198156731..6ba782e24f3a 100644
--- a/tests/virtio-9p-test.c
+++ b/tests/virtio-9p-test.c
@@ -238,6 +238,7 @@ static const char *rmessage_name(uint8_t id)
         id == P9_RVERSION ? "RVERSION" :
         id == P9_RATTACH ? "RATTACH" :
         id == P9_RWALK ? "RWALK" :
+        id == P9_RLOPEN ? "RLOPEN" :
         "<unknown>";
 }
 
@@ -389,6 +390,34 @@ static void v9fs_rwalk(P9Req *req, uint16_t *nwqid, v9fs_qid **wqid)
     v9fs_req_free(req);
 }
 
+/* size[4] Tlopen tag[2] fid[4] flags[4] */
+static P9Req *v9fs_tlopen(QVirtIO9P *v9p, uint32_t fid, uint32_t flags,
+                          uint16_t tag)
+{
+    P9Req *req;
+
+    req = v9fs_req_init(v9p,  4 + 4, P9_TLOPEN, tag);
+    v9fs_uint32_write(req, fid);
+    v9fs_uint32_write(req, flags);
+    v9fs_req_send(req);
+    return req;
+}
+
+/* size[4] Rlopen tag[2] qid[13] iounit[4] */
+static void v9fs_rlopen(P9Req *req, v9fs_qid *qid, uint32_t *iounit)
+{
+    v9fs_req_recv(req, P9_RLOPEN);
+    if (qid) {
+        v9fs_memread(req, qid, 13);
+    } else {
+        v9fs_memskip(req, 13);
+    }
+    if (iounit) {
+        v9fs_uint32_read(req, iounit);
+    }
+    v9fs_req_free(req);
+}
+
 static void fs_version(QVirtIO9P *v9p)
 {
     const char *version = "9P2000.L";
@@ -478,6 +507,23 @@ static void fs_walk_dotdot(QVirtIO9P *v9p)
     g_free(wnames[0]);
 }
 
+static void fs_lopen(QVirtIO9P *v9p)
+{
+    char *const wnames[] = { g_strdup(QTEST_V9FS_SYNTH_LOPEN_FILE) };
+    P9Req *req;
+
+    fs_attach(v9p);
+    req = v9fs_twalk(v9p, 0, 1, 1, wnames, 0);
+    v9fs_req_wait_for_reply(req);
+    v9fs_rwalk(req, NULL, NULL);
+
+    req = v9fs_tlopen(v9p, 1, O_WRONLY, 0);
+    v9fs_req_wait_for_reply(req);
+    v9fs_rlopen(req, NULL, NULL);
+
+    g_free(wnames[0]);
+}
+
 typedef void (*v9fs_test_fn)(QVirtIO9P *v9p);
 
 static void v9fs_run_pci_test(gconstpointer data)
@@ -507,6 +553,7 @@ int main(int argc, char **argv)
     v9fs_qtest_pci_add("/virtio/9p/pci/fs/walk/no_slash", fs_walk_no_slash);
     v9fs_qtest_pci_add("/virtio/9p/pci/fs/walk/dotdot_from_root",
                        fs_walk_dotdot);
+    v9fs_qtest_pci_add("/virtio/9p/pci/fs/lopen/basic", fs_lopen);
 
     return g_test_run();
 }

[Qemu-devel] [PATCH 5/7] tests: virtio-9p: add WRITE operation test

[Greg Kurz]

Trivial test of a successful write.

Signed-off-by: Greg Kurz <groug@kaod.org>
---
 hw/9pfs/9p-synth.c     |   11 +++++++++
 hw/9pfs/9p-synth.h     |    1 +
 tests/virtio-9p-test.c |   59 ++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 71 insertions(+)

diff --git a/hw/9pfs/9p-synth.c b/hw/9pfs/9p-synth.c
index f17b74f44461..f2d59a90a670 100644
--- a/hw/9pfs/9p-synth.c
+++ b/hw/9pfs/9p-synth.c
@@ -515,6 +515,12 @@ static int synth_unlinkat(FsContext *ctx, V9fsPath *dir,
     return -1;
 }
 
+static ssize_t v9fs_synth_qtest_write(void *buf, int len, off_t offset,
+                                      void *arg)
+{
+    return len;
+}
+
 static int synth_init(FsContext *ctx, Error **errp)
 {
     QLIST_INIT(&synth_root.child);
@@ -546,6 +552,11 @@ static int synth_init(FsContext *ctx, Error **errp)
         ret = qemu_v9fs_synth_add_file(NULL, 0, QTEST_V9FS_SYNTH_LOPEN_FILE,
                                        NULL, NULL, ctx);
         assert(!ret);
+
+        /* File for WRITE test */
+        ret = qemu_v9fs_synth_add_file(NULL, 0, QTEST_V9FS_SYNTH_WRITE_FILE,
+                                       NULL, v9fs_synth_qtest_write, ctx);
+        assert(!ret);
     }
 
     return 0;
diff --git a/hw/9pfs/9p-synth.h b/hw/9pfs/9p-synth.h
index 2a8d6fd00d69..a74032d7bd9a 100644
--- a/hw/9pfs/9p-synth.h
+++ b/hw/9pfs/9p-synth.h
@@ -53,5 +53,6 @@ int qemu_v9fs_synth_add_file(V9fsSynthNode *parent, int mode,
 
 #define QTEST_V9FS_SYNTH_WALK_FILE "WALK%d"
 #define QTEST_V9FS_SYNTH_LOPEN_FILE "LOPEN"
+#define QTEST_V9FS_SYNTH_WRITE_FILE "WRITE"
 
 #endif
diff --git a/tests/virtio-9p-test.c b/tests/virtio-9p-test.c
index 6ba782e24f3a..5871a16dac73 100644
--- a/tests/virtio-9p-test.c
+++ b/tests/virtio-9p-test.c
@@ -150,6 +150,13 @@ static void v9fs_uint32_write(P9Req *req, uint32_t val)
     v9fs_memwrite(req, &le_val, 4);
 }
 
+static void v9fs_uint64_write(P9Req *req, uint64_t val)
+{
+    uint64_t le_val = cpu_to_le64(val);
+
+    v9fs_memwrite(req, &le_val, 8);
+}
+
 static void v9fs_uint32_read(P9Req *req, uint32_t *val)
 {
     v9fs_memread(req, val, 4);
@@ -239,6 +246,7 @@ static const char *rmessage_name(uint8_t id)
         id == P9_RATTACH ? "RATTACH" :
         id == P9_RWALK ? "RWALK" :
         id == P9_RLOPEN ? "RLOPEN" :
+        id == P9_RWRITE ? "RWRITE" :
         "<unknown>";
 }
 
@@ -418,6 +426,31 @@ static void v9fs_rlopen(P9Req *req, v9fs_qid *qid, uint32_t *iounit)
     v9fs_req_free(req);
 }
 
+/* size[4] Twrite tag[2] fid[4] offset[8] count[4] data[count] */
+static P9Req *v9fs_twrite(QVirtIO9P *v9p, uint32_t fid, uint64_t offset,
+                          uint32_t count, const void *data, uint16_t tag)
+{
+    P9Req *req;
+
+    req = v9fs_req_init(v9p,  4 + 8 + 4 + count, P9_TWRITE, tag);
+    v9fs_uint32_write(req, fid);
+    v9fs_uint64_write(req, offset);
+    v9fs_uint32_write(req, count);
+    v9fs_memwrite(req, data, count);
+    v9fs_req_send(req);
+    return req;
+}
+
+/* size[4] Rwrite tag[2] count[4] */
+static void v9fs_rwrite(P9Req *req, uint32_t *count)
+{
+    v9fs_req_recv(req, P9_RWRITE);
+    if (count) {
+        v9fs_uint32_read(req, count);
+    }
+    v9fs_req_free(req);
+}
+
 static void fs_version(QVirtIO9P *v9p)
 {
     const char *version = "9P2000.L";
@@ -524,6 +557,31 @@ static void fs_lopen(QVirtIO9P *v9p)
     g_free(wnames[0]);
 }
 
+static void fs_write(QVirtIO9P *v9p)
+{
+    static const uint32_t write_count = P9_MAX_SIZE / 2;
+    char *const wnames[] = { g_strdup(QTEST_V9FS_SYNTH_WRITE_FILE) };
+    char *buf = g_malloc(write_count);
+    uint32_t count;
+    P9Req *req;
+
+    fs_attach(v9p);
+    req = v9fs_twalk(v9p, 0, 1, 1, wnames, 0);
+    v9fs_req_wait_for_reply(req);
+    v9fs_rwalk(req, NULL, NULL);
+
+    req = v9fs_tlopen(v9p, 1, O_WRONLY, 0);
+    v9fs_req_wait_for_reply(req);
+    v9fs_rlopen(req, NULL, NULL);
+
+    req = v9fs_twrite(v9p, 1, 0, write_count, buf, 0);
+    v9fs_req_wait_for_reply(req);
+    v9fs_rwrite(req, &count);
+    g_assert_cmpint(count, ==, write_count);
+
+    g_free(wnames[0]);
+}
+
 typedef void (*v9fs_test_fn)(QVirtIO9P *v9p);
 
 static void v9fs_run_pci_test(gconstpointer data)
@@ -554,6 +612,7 @@ int main(int argc, char **argv)
     v9fs_qtest_pci_add("/virtio/9p/pci/fs/walk/dotdot_from_root",
                        fs_walk_dotdot);
     v9fs_qtest_pci_add("/virtio/9p/pci/fs/lopen/basic", fs_lopen);
+    v9fs_qtest_pci_add("/virtio/9p/pci/fs/write/basic", fs_write);
 
     return g_test_run();
 }

[Qemu-devel] [PATCH 6/7] libqos/virtio: return length written into used descriptor

[Greg Kurz]

When a 9p request is flushed (ie, cancelled) by the guest, the device
is expected to simply mark the request as used, without sending a 9p
reply (ie, without writing anything into the used buffer).

To be able to test this, we need access to the length written by the
device into the used descriptor. This patch adds a uint32_t * argument
to qvirtqueue_get_buf() and qvirtio_wait_used_elem() for this purpose.

All existing users are updated accordingly.

Signed-off-by: Greg Kurz <groug@kaod.org>
---
 tests/libqos/virtio.c    |   25 +++++++++++++++++--------
 tests/libqos/virtio.h    |    3 ++-
 tests/virtio-9p-test.c   |    2 +-
 tests/virtio-blk-test.c  |   24 +++++++++++++-----------
 tests/virtio-net-test.c  |    6 +++---
 tests/virtio-scsi-test.c |    3 ++-
 6 files changed, 38 insertions(+), 25 deletions(-)

diff --git a/tests/libqos/virtio.c b/tests/libqos/virtio.c
index 0879a621c8af..0dad5c19acde 100644
--- a/tests/libqos/virtio.c
+++ b/tests/libqos/virtio.c
@@ -119,6 +119,8 @@ uint8_t qvirtio_wait_status_byte_no_isr(QVirtioDevice *d,
 /*
  * qvirtio_wait_used_elem:
  * @desc_idx: The next expected vq->desc[] index in the used ring
+ * @len: A pointer that is filled with the length written into the buffer, may
+ *       be NULL
  * @timeout_us: How many microseconds to wait before failing
  *
  * This function waits for the next completed request on the used ring.
@@ -126,6 +128,7 @@ uint8_t qvirtio_wait_status_byte_no_isr(QVirtioDevice *d,
 void qvirtio_wait_used_elem(QVirtioDevice *d,
                             QVirtQueue *vq,
                             uint32_t desc_idx,
+                            uint32_t *len,
                             gint64 timeout_us)
 {
     gint64 start_time = g_get_monotonic_time();
@@ -136,7 +139,7 @@ void qvirtio_wait_used_elem(QVirtioDevice *d,
         clock_step(100);
 
         if (d->bus->get_queue_isr_status(d, vq) &&
-            qvirtqueue_get_buf(vq, &got_desc_idx)) {
+            qvirtqueue_get_buf(vq, &got_desc_idx, len)) {
             g_assert_cmpint(got_desc_idx, ==, desc_idx);
             return;
         }
@@ -304,30 +307,36 @@ void qvirtqueue_kick(QVirtioDevice *d, QVirtQueue *vq, uint32_t free_head)
 /*
  * qvirtqueue_get_buf:
  * @desc_idx: A pointer that is filled with the vq->desc[] index, may be NULL
+ * @len: A pointer that is filled with the length written into the buffer, may
+ *       be NULL
  *
  * This function gets the next used element if there is one ready.
  *
  * Returns: true if an element was ready, false otherwise
  */
-bool qvirtqueue_get_buf(QVirtQueue *vq, uint32_t *desc_idx)
+bool qvirtqueue_get_buf(QVirtQueue *vq, uint32_t *desc_idx, uint32_t *len)
 {
     uint16_t idx;
+    uint64_t elem_addr;
 
     idx = readw(vq->used + offsetof(struct vring_used, idx));
     if (idx == vq->last_used_idx) {
         return false;
     }
 
-    if (desc_idx) {
-        uint64_t elem_addr;
+    elem_addr = vq->used +
+        offsetof(struct vring_used, ring) +
+        (vq->last_used_idx % vq->size) *
+        sizeof(struct vring_used_elem);
 
-        elem_addr = vq->used +
-                    offsetof(struct vring_used, ring) +
-                    (vq->last_used_idx % vq->size) *
-                    sizeof(struct vring_used_elem);
+    if (desc_idx) {
         *desc_idx = readl(elem_addr + offsetof(struct vring_used_elem, id));
     }
 
+    if (len) {
+        *len = readw(elem_addr + offsetof(struct vring_used_elem, len));
+    }
+
     vq->last_used_idx++;
     return true;
 }
diff --git a/tests/libqos/virtio.h b/tests/libqos/virtio.h
index 0a04740adfe1..69b5b13840e7 100644
--- a/tests/libqos/virtio.h
+++ b/tests/libqos/virtio.h
@@ -124,6 +124,7 @@ uint8_t qvirtio_wait_status_byte_no_isr(QVirtioDevice *d,
 void qvirtio_wait_used_elem(QVirtioDevice *d,
                             QVirtQueue *vq,
                             uint32_t desc_idx,
+                            uint32_t *len,
                             gint64 timeout_us);
 void qvirtio_wait_config_isr(QVirtioDevice *d, gint64 timeout_us);
 QVirtQueue *qvirtqueue_setup(QVirtioDevice *d,
@@ -140,7 +141,7 @@ uint32_t qvirtqueue_add(QVirtQueue *vq, uint64_t data, uint32_t len, bool write,
                                                                     bool next);
 uint32_t qvirtqueue_add_indirect(QVirtQueue *vq, QVRingIndirectDesc *indirect);
 void qvirtqueue_kick(QVirtioDevice *d, QVirtQueue *vq, uint32_t free_head);
-bool qvirtqueue_get_buf(QVirtQueue *vq, uint32_t *desc_idx);
+bool qvirtqueue_get_buf(QVirtQueue *vq, uint32_t *desc_idx, uint32_t *len);
 
 void qvirtqueue_set_used_event(QVirtQueue *vq, uint16_t idx);
 
diff --git a/tests/virtio-9p-test.c b/tests/virtio-9p-test.c
index 5871a16dac73..57ae3a666c61 100644
--- a/tests/virtio-9p-test.c
+++ b/tests/virtio-9p-test.c
@@ -254,7 +254,7 @@ static void v9fs_req_wait_for_reply(P9Req *req)
 {
     QVirtIO9P *v9p = req->v9p;
 
-    qvirtio_wait_used_elem(v9p->dev, v9p->vq, req->free_head,
+    qvirtio_wait_used_elem(v9p->dev, v9p->vq, req->free_head, NULL,
                            QVIRTIO_9P_TIMEOUT_US);
 }
 
diff --git a/tests/virtio-blk-test.c b/tests/virtio-blk-test.c
index 45f368dcd966..2ac64e5e2559 100644
--- a/tests/virtio-blk-test.c
+++ b/tests/virtio-blk-test.c
@@ -193,7 +193,7 @@ static void test_basic(QVirtioDevice *dev, QGuestAllocator *alloc,
 
     qvirtqueue_kick(dev, vq, free_head);
 
-    qvirtio_wait_used_elem(dev, vq, free_head, QVIRTIO_BLK_TIMEOUT_US);
+    qvirtio_wait_used_elem(dev, vq, free_head, NULL, QVIRTIO_BLK_TIMEOUT_US);
     status = readb(req_addr + 528);
     g_assert_cmpint(status, ==, 0);
 
@@ -215,7 +215,7 @@ static void test_basic(QVirtioDevice *dev, QGuestAllocator *alloc,
 
     qvirtqueue_kick(dev, vq, free_head);
 
-    qvirtio_wait_used_elem(dev, vq, free_head, QVIRTIO_BLK_TIMEOUT_US);
+    qvirtio_wait_used_elem(dev, vq, free_head, NULL, QVIRTIO_BLK_TIMEOUT_US);
     status = readb(req_addr + 528);
     g_assert_cmpint(status, ==, 0);
 
@@ -243,7 +243,8 @@ static void test_basic(QVirtioDevice *dev, QGuestAllocator *alloc,
         qvirtqueue_add(vq, req_addr + 528, 1, true, false);
         qvirtqueue_kick(dev, vq, free_head);
 
-        qvirtio_wait_used_elem(dev, vq, free_head, QVIRTIO_BLK_TIMEOUT_US);
+        qvirtio_wait_used_elem(dev, vq, free_head, NULL,
+                               QVIRTIO_BLK_TIMEOUT_US);
         status = readb(req_addr + 528);
         g_assert_cmpint(status, ==, 0);
 
@@ -264,7 +265,8 @@ static void test_basic(QVirtioDevice *dev, QGuestAllocator *alloc,
 
         qvirtqueue_kick(dev, vq, free_head);
 
-        qvirtio_wait_used_elem(dev, vq, free_head, QVIRTIO_BLK_TIMEOUT_US);
+        qvirtio_wait_used_elem(dev, vq, free_head, NULL,
+                               QVIRTIO_BLK_TIMEOUT_US);
         status = readb(req_addr + 528);
         g_assert_cmpint(status, ==, 0);
 
@@ -345,7 +347,7 @@ static void pci_indirect(void)
     free_head = qvirtqueue_add_indirect(&vqpci->vq, indirect);
     qvirtqueue_kick(&dev->vdev, &vqpci->vq, free_head);
 
-    qvirtio_wait_used_elem(&dev->vdev, &vqpci->vq, free_head,
+    qvirtio_wait_used_elem(&dev->vdev, &vqpci->vq, free_head, NULL,
                            QVIRTIO_BLK_TIMEOUT_US);
     status = readb(req_addr + 528);
     g_assert_cmpint(status, ==, 0);
@@ -370,7 +372,7 @@ static void pci_indirect(void)
     free_head = qvirtqueue_add_indirect(&vqpci->vq, indirect);
     qvirtqueue_kick(&dev->vdev, &vqpci->vq, free_head);
 
-    qvirtio_wait_used_elem(&dev->vdev, &vqpci->vq, free_head,
+    qvirtio_wait_used_elem(&dev->vdev, &vqpci->vq, free_head, NULL,
                            QVIRTIO_BLK_TIMEOUT_US);
     status = readb(req_addr + 528);
     g_assert_cmpint(status, ==, 0);
@@ -481,7 +483,7 @@ static void pci_msix(void)
     qvirtqueue_add(&vqpci->vq, req_addr + 528, 1, true, false);
     qvirtqueue_kick(&dev->vdev, &vqpci->vq, free_head);
 
-    qvirtio_wait_used_elem(&dev->vdev, &vqpci->vq, free_head,
+    qvirtio_wait_used_elem(&dev->vdev, &vqpci->vq, free_head, NULL,
                            QVIRTIO_BLK_TIMEOUT_US);
 
     status = readb(req_addr + 528);
@@ -506,7 +508,7 @@ static void pci_msix(void)
     qvirtqueue_kick(&dev->vdev, &vqpci->vq, free_head);
 
 
-    qvirtio_wait_used_elem(&dev->vdev, &vqpci->vq, free_head,
+    qvirtio_wait_used_elem(&dev->vdev, &vqpci->vq, free_head, NULL,
                            QVIRTIO_BLK_TIMEOUT_US);
 
     status = readb(req_addr + 528);
@@ -580,7 +582,7 @@ static void pci_idx(void)
     qvirtqueue_add(&vqpci->vq, req_addr + 528, 1, true, false);
     qvirtqueue_kick(&dev->vdev, &vqpci->vq, free_head);
 
-    qvirtio_wait_used_elem(&dev->vdev, &vqpci->vq, free_head,
+    qvirtio_wait_used_elem(&dev->vdev, &vqpci->vq, free_head, NULL,
                            QVIRTIO_BLK_TIMEOUT_US);
 
     /* Write request */
@@ -627,9 +629,9 @@ static void pci_idx(void)
     qvirtqueue_kick(&dev->vdev, &vqpci->vq, free_head);
 
     /* We get just one notification for both requests */
-    qvirtio_wait_used_elem(&dev->vdev, &vqpci->vq, write_head,
+    qvirtio_wait_used_elem(&dev->vdev, &vqpci->vq, write_head, NULL,
                            QVIRTIO_BLK_TIMEOUT_US);
-    g_assert(qvirtqueue_get_buf(&vqpci->vq, &desc_idx));
+    g_assert(qvirtqueue_get_buf(&vqpci->vq, &desc_idx, NULL));
     g_assert_cmpint(desc_idx, ==, free_head);
 
     status = readb(req_addr + 528);
diff --git a/tests/virtio-net-test.c b/tests/virtio-net-test.c
index 635b942c3601..ea634dc05a60 100644
--- a/tests/virtio-net-test.c
+++ b/tests/virtio-net-test.c
@@ -108,7 +108,7 @@ static void rx_test(QVirtioDevice *dev,
     ret = iov_send(socket, iov, 2, 0, sizeof(len) + sizeof(test));
     g_assert_cmpint(ret, ==, sizeof(test) + sizeof(len));
 
-    qvirtio_wait_used_elem(dev, vq, free_head, QVIRTIO_NET_TIMEOUT_US);
+    qvirtio_wait_used_elem(dev, vq, free_head, NULL, QVIRTIO_NET_TIMEOUT_US);
     memread(req_addr + VNET_HDR_SIZE, buffer, sizeof(test));
     g_assert_cmpstr(buffer, ==, "TEST");
 
@@ -131,7 +131,7 @@ static void tx_test(QVirtioDevice *dev,
     free_head = qvirtqueue_add(vq, req_addr, 64, false, false);
     qvirtqueue_kick(dev, vq, free_head);
 
-    qvirtio_wait_used_elem(dev, vq, free_head, QVIRTIO_NET_TIMEOUT_US);
+    qvirtio_wait_used_elem(dev, vq, free_head, NULL, QVIRTIO_NET_TIMEOUT_US);
     guest_free(alloc, req_addr);
 
     ret = qemu_recv(socket, &len, sizeof(len), 0);
@@ -182,7 +182,7 @@ static void rx_stop_cont_test(QVirtioDevice *dev,
     rsp = qmp("{ 'execute' : 'cont'}");
     QDECREF(rsp);
 
-    qvirtio_wait_used_elem(dev, vq, free_head, QVIRTIO_NET_TIMEOUT_US);
+    qvirtio_wait_used_elem(dev, vq, free_head, NULL, QVIRTIO_NET_TIMEOUT_US);
     memread(req_addr + VNET_HDR_SIZE, buffer, sizeof(test));
     g_assert_cmpstr(buffer, ==, "TEST");
 
diff --git a/tests/virtio-scsi-test.c b/tests/virtio-scsi-test.c
index 2934305b2bff..bcf408fbb637 100644
--- a/tests/virtio-scsi-test.c
+++ b/tests/virtio-scsi-test.c
@@ -121,7 +121,8 @@ static uint8_t virtio_scsi_do_command(QVirtIOSCSI *vs, const uint8_t *cdb,
     }
 
     qvirtqueue_kick(vs->dev, vq, free_head);
-    qvirtio_wait_used_elem(vs->dev, vq, free_head, QVIRTIO_SCSI_TIMEOUT_US);
+    qvirtio_wait_used_elem(vs->dev, vq, free_head, NULL,
+                           QVIRTIO_SCSI_TIMEOUT_US);
 
     response = readb(resp_addr +
                      offsetof(struct virtio_scsi_cmd_resp, response));

[Qemu-devel] [PATCH 7/7] tests: virtio-9p: add FLUSH operation test

[Greg Kurz]

The idea is to send a victim request that will possibly block in the
server and to send a flush request to cancel the victim request.

This patch adds two test to verifiy that:
- the server does not reply to a victim request that was actually
  cancelled
- the server replies to the flush request after replying to the
  victim request if it could not cancel it

9p request cancellation reference:

http://man.cat-v.org/plan_9/5/flush

Signed-off-by: Greg Kurz <groug@kaod.org>
---
 hw/9pfs/9p-synth.c     |   24 ++++++++++
 hw/9pfs/9p-synth.h     |    5 ++
 hw/9pfs/9p.c           |    1 
 tests/virtio-9p-test.c |  117 +++++++++++++++++++++++++++++++++++++++++++-----
 4 files changed, 134 insertions(+), 13 deletions(-)

diff --git a/hw/9pfs/9p-synth.c b/hw/9pfs/9p-synth.c
index f2d59a90a670..0a9940dfa23c 100644
--- a/hw/9pfs/9p-synth.c
+++ b/hw/9pfs/9p-synth.c
@@ -521,6 +521,24 @@ static ssize_t v9fs_synth_qtest_write(void *buf, int len, off_t offset,
     return len;
 }
 
+static ssize_t v9fs_synth_qtest_flush_write(void *buf, int len, off_t offset,
+                                            void *arg)
+{
+    QtestV9fsSynthFlushData *data = buf;
+
+    assert(len == sizeof(*data));
+
+    if (data->usec_timeout) {
+        usleep(data->usec_timeout);
+
+        /* This will cause the server to call us again until we're cancelled */
+        errno = EINTR;
+        return -1;
+    }
+
+    return len;
+}
+
 static int synth_init(FsContext *ctx, Error **errp)
 {
     QLIST_INIT(&synth_root.child);
@@ -557,6 +575,12 @@ static int synth_init(FsContext *ctx, Error **errp)
         ret = qemu_v9fs_synth_add_file(NULL, 0, QTEST_V9FS_SYNTH_WRITE_FILE,
                                        NULL, v9fs_synth_qtest_write, ctx);
         assert(!ret);
+
+        /* File for FLUSH test */
+        ret = qemu_v9fs_synth_add_file(NULL, 0, QTEST_V9FS_SYNTH_FLUSH_FILE,
+                                       NULL, v9fs_synth_qtest_flush_write,
+                                       ctx);
+        assert(!ret);
     }
 
     return 0;
diff --git a/hw/9pfs/9p-synth.h b/hw/9pfs/9p-synth.h
index a74032d7bd9a..502ec6309a36 100644
--- a/hw/9pfs/9p-synth.h
+++ b/hw/9pfs/9p-synth.h
@@ -54,5 +54,10 @@ int qemu_v9fs_synth_add_file(V9fsSynthNode *parent, int mode,
 #define QTEST_V9FS_SYNTH_WALK_FILE "WALK%d"
 #define QTEST_V9FS_SYNTH_LOPEN_FILE "LOPEN"
 #define QTEST_V9FS_SYNTH_WRITE_FILE "WRITE"
+#define QTEST_V9FS_SYNTH_FLUSH_FILE "FLUSH"
+
+typedef struct {
+    uint32_t usec_timeout;
+} QtestV9fsSynthFlushData;
 
 #endif
diff --git a/hw/9pfs/9p.c b/hw/9pfs/9p.c
index 73dafffe239f..eae82db4ef60 100644
--- a/hw/9pfs/9p.c
+++ b/hw/9pfs/9p.c
@@ -24,6 +24,7 @@
 #include "coth.h"
 #include "trace.h"
 #include "migration/blocker.h"
+#include "sysemu/qtest.h"
 
 int open_fd_hw;
 int total_open_fd;
diff --git a/tests/virtio-9p-test.c b/tests/virtio-9p-test.c
index 57ae3a666c61..b234e09e252d 100644
--- a/tests/virtio-9p-test.c
+++ b/tests/virtio-9p-test.c
@@ -247,14 +247,15 @@ static const char *rmessage_name(uint8_t id)
         id == P9_RWALK ? "RWALK" :
         id == P9_RLOPEN ? "RLOPEN" :
         id == P9_RWRITE ? "RWRITE" :
+        id == P9_RFLUSH ? "RFLUSH" :
         "<unknown>";
 }
 
-static void v9fs_req_wait_for_reply(P9Req *req)
+static void v9fs_req_wait_for_reply(P9Req *req, uint32_t *len)
 {
     QVirtIO9P *v9p = req->v9p;
 
-    qvirtio_wait_used_elem(v9p->dev, v9p->vq, req->free_head, NULL,
+    qvirtio_wait_used_elem(v9p->dev, v9p->vq, req->free_head, len,
                            QVIRTIO_9P_TIMEOUT_US);
 }
 
@@ -451,6 +452,24 @@ static void v9fs_rwrite(P9Req *req, uint32_t *count)
     v9fs_req_free(req);
 }
 
+/* size[4] Tflush tag[2] oldtag[2] */
+static P9Req *v9fs_tflush(QVirtIO9P *v9p, uint16_t oldtag, uint16_t tag)
+{
+    P9Req *req;
+
+    req = v9fs_req_init(v9p,  2, P9_TFLUSH, tag);
+    v9fs_uint32_write(req, oldtag);
+    v9fs_req_send(req);
+    return req;
+}
+
+/* size[4] Rflush tag[2] */
+static void v9fs_rflush(P9Req *req)
+{
+    v9fs_req_recv(req, P9_RFLUSH);
+    v9fs_req_free(req);
+}
+
 static void fs_version(QVirtIO9P *v9p)
 {
     const char *version = "9P2000.L";
@@ -459,7 +478,7 @@ static void fs_version(QVirtIO9P *v9p)
     P9Req *req;
 
     req = v9fs_tversion(v9p, P9_MAX_SIZE, version, P9_NOTAG);
-    v9fs_req_wait_for_reply(req);
+    v9fs_req_wait_for_reply(req, NULL);
     v9fs_rversion(req, &server_len, &server_version);
 
     g_assert_cmpmem(server_version, server_len, version, strlen(version));
@@ -473,7 +492,7 @@ static void fs_attach(QVirtIO9P *v9p)
 
     fs_version(v9p);
     req = v9fs_tattach(v9p, 0, getuid(), 0);
-    v9fs_req_wait_for_reply(req);
+    v9fs_req_wait_for_reply(req, NULL);
     v9fs_rattach(req, NULL);
 }
 
@@ -491,7 +510,7 @@ static void fs_walk(QVirtIO9P *v9p)
 
     fs_attach(v9p);
     req = v9fs_twalk(v9p, 0, 1, P9_MAXWELEM, wnames, 0);
-    v9fs_req_wait_for_reply(req);
+    v9fs_req_wait_for_reply(req, NULL);
     v9fs_rwalk(req, &nwqid, &wqid);
 
     g_assert_cmpint(nwqid, ==, P9_MAXWELEM);
@@ -511,7 +530,7 @@ static void fs_walk_no_slash(QVirtIO9P *v9p)
 
     fs_attach(v9p);
     req = v9fs_twalk(v9p, 0, 1, 1, wnames, 0);
-    v9fs_req_wait_for_reply(req);
+    v9fs_req_wait_for_reply(req, NULL);
     v9fs_rlerror(req, &err);
 
     g_assert_cmpint(err, ==, ENOENT);
@@ -527,11 +546,11 @@ static void fs_walk_dotdot(QVirtIO9P *v9p)
 
     fs_version(v9p);
     req = v9fs_tattach(v9p, 0, getuid(), 0);
-    v9fs_req_wait_for_reply(req);
+    v9fs_req_wait_for_reply(req, NULL);
     v9fs_rattach(req, &root_qid);
 
     req = v9fs_twalk(v9p, 0, 1, 1, wnames, 0);
-    v9fs_req_wait_for_reply(req);
+    v9fs_req_wait_for_reply(req, NULL);
     v9fs_rwalk(req, NULL, &wqid); /* We now we'll get one qid */
 
     g_assert_cmpmem(&root_qid, 13, wqid[0], 13);
@@ -547,11 +566,11 @@ static void fs_lopen(QVirtIO9P *v9p)
 
     fs_attach(v9p);
     req = v9fs_twalk(v9p, 0, 1, 1, wnames, 0);
-    v9fs_req_wait_for_reply(req);
+    v9fs_req_wait_for_reply(req, NULL);
     v9fs_rwalk(req, NULL, NULL);
 
     req = v9fs_tlopen(v9p, 1, O_WRONLY, 0);
-    v9fs_req_wait_for_reply(req);
+    v9fs_req_wait_for_reply(req, NULL);
     v9fs_rlopen(req, NULL, NULL);
 
     g_free(wnames[0]);
@@ -567,21 +586,91 @@ static void fs_write(QVirtIO9P *v9p)
 
     fs_attach(v9p);
     req = v9fs_twalk(v9p, 0, 1, 1, wnames, 0);
-    v9fs_req_wait_for_reply(req);
+    v9fs_req_wait_for_reply(req, NULL);
     v9fs_rwalk(req, NULL, NULL);
 
     req = v9fs_tlopen(v9p, 1, O_WRONLY, 0);
-    v9fs_req_wait_for_reply(req);
+    v9fs_req_wait_for_reply(req, NULL);
     v9fs_rlopen(req, NULL, NULL);
 
     req = v9fs_twrite(v9p, 1, 0, write_count, buf, 0);
-    v9fs_req_wait_for_reply(req);
+    v9fs_req_wait_for_reply(req, NULL);
     v9fs_rwrite(req, &count);
     g_assert_cmpint(count, ==, write_count);
 
     g_free(wnames[0]);
 }
 
+static void fs_flush_success(QVirtIO9P *v9p)
+{
+    char *const wnames[] = { g_strdup(QTEST_V9FS_SYNTH_FLUSH_FILE) };
+    QtestV9fsSynthFlushData data;
+    P9Req *req, *flush_req;
+    uint32_t reply_len;
+
+    fs_attach(v9p);
+    req = v9fs_twalk(v9p, 0, 1, 1, wnames, 0);
+    v9fs_req_wait_for_reply(req, NULL);
+    v9fs_rwalk(req, NULL, NULL);
+
+    req = v9fs_tlopen(v9p, 1, O_WRONLY, 0);
+    v9fs_req_wait_for_reply(req, NULL);
+    v9fs_rlopen(req, NULL, NULL);
+
+    /* This will cause the 9p server to try to write data to the backend,
+     * until the write request gets cancelled.
+     */
+    data.usec_timeout = 10;
+    req = v9fs_twrite(v9p, 1, 0, sizeof(data), &data, 0);
+
+    flush_req = v9fs_tflush(v9p, req->tag, 1);
+
+    /* The write request is supposed to be flushed: the server should just
+     * mark the write request as used and reply to the flush request.
+     */
+    v9fs_req_wait_for_reply(req, &reply_len);
+    g_assert_cmpint(reply_len, ==, 0);
+    v9fs_req_free(req);
+    v9fs_rflush(flush_req);
+
+    g_free(wnames[0]);
+}
+
+static void fs_flush_ignored(QVirtIO9P *v9p)
+{
+    char *const wnames[] = { g_strdup(QTEST_V9FS_SYNTH_FLUSH_FILE) };
+    QtestV9fsSynthFlushData data;
+    P9Req *req, *flush_req;
+    uint32_t count;
+
+    fs_attach(v9p);
+    req = v9fs_twalk(v9p, 0, 1, 1, wnames, 0);
+    v9fs_req_wait_for_reply(req, NULL);
+    v9fs_rwalk(req, NULL, NULL);
+
+    req = v9fs_tlopen(v9p, 1, O_WRONLY, 0);
+    v9fs_req_wait_for_reply(req, NULL);
+    v9fs_rlopen(req, NULL, NULL);
+
+    /* This will cause the write request to complete right away, before it
+     * could be actually cancelled.
+     */
+    data.usec_timeout = 0;
+    req = v9fs_twrite(v9p, 1, 0, sizeof(data), &data, 0);
+
+    flush_req = v9fs_tflush(v9p, req->tag, 1);
+
+    /* The write request is supposed to complete. The server should
+     * reply to the write request and the flush request.
+     */
+    v9fs_req_wait_for_reply(req, NULL);
+    v9fs_rwrite(req, &count);
+    g_assert_cmpint(count, ==, sizeof(data));
+    v9fs_rflush(flush_req);
+
+    g_free(wnames[0]);
+}
+
 typedef void (*v9fs_test_fn)(QVirtIO9P *v9p);
 
 static void v9fs_run_pci_test(gconstpointer data)
@@ -613,6 +702,8 @@ int main(int argc, char **argv)
                        fs_walk_dotdot);
     v9fs_qtest_pci_add("/virtio/9p/pci/fs/lopen/basic", fs_lopen);
     v9fs_qtest_pci_add("/virtio/9p/pci/fs/write/basic", fs_write);
+    v9fs_qtest_pci_add("/virtio/9p/pci/fs/flush/success", fs_flush_success);
+    v9fs_qtest_pci_add("/virtio/9p/pci/fs/flush/ignored", fs_flush_ignored);
 
     return g_test_run();
 }

Re: [Qemu-devel] [PATCH 5/7] tests: virtio-9p: add WRITE operation test

[Stefan Hajnoczi]

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On Wed, Jan 24, 2018 at 12:39:23AM +0100, Greg Kurz wrote:
> +/* size[4] Twrite tag[2] fid[4] offset[8] count[4] data[count] */
> +static P9Req *v9fs_twrite(QVirtIO9P *v9p, uint32_t fid, uint64_t offset,
> +                          uint32_t count, const void *data, uint16_t tag)
> +{
> +    P9Req *req;
> +
> +    req = v9fs_req_init(v9p,  4 + 8 + 4 + count, P9_TWRITE, tag);

(uint32_t)(4 + 8 + 4 + (uint32_t)count) can overflow.  I didn't look
closely at the code and it's just a test case, but it seems safer to use
types that avoid overflows or to handle them explicitly.

It may not be an issue in a test case, but if someone copy pastes this
code it could become a security issue.

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Re: [Qemu-devel] [PATCH 0/7] tests: virtio-9p: test request cancellation

[Stefan Hajnoczi]

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On Wed, Jan 24, 2018 at 12:38:30AM +0100, Greg Kurz wrote:
> This series does several changes to virtio-9p-test in order to be able
> to test request cancellation (flush in 9p wording):
> 
> patches 1-2: preparatory work, basically doing things in the test code,
>              rather that in the common code for flexibility and clarity
> 
> patch 3: the cornerstone of the series, switch to using the synth fsdev
>          backend, which allows to associate specific write/read ops to
>          a given file. Since this backend never got used since it was
>          merged, it looks like an ideal vehicle to add QTEST aware code
>          in QEMU
> 
> patches 4-5: trivial open & write tests, since the flush test will need
>              to open a file and write to it
> 
> patch 6: another important patch that allows to know the length written
>          by the guest into a used buffer 
> 
> patch 7: the goal of this series, two request cancellation tests
> 
> This series depends on the following patch:
> 
> https://lists.nongnu.org/archive/html/qemu-devel/2018-01/msg05604.html
> 
> Please comment.
> 
> Cheers,
> 
> --
> Greg
> 
> ---
> 
> Greg Kurz (7):
>       tests: virtio-9p: move request tag to the test functions
>       tests: virtio-9p: wait for completion in the test code
>       tests: virtio-9p: use the synth backend
>       tests: virtio-9p: add LOPEN operation test
>       tests: virtio-9p: add WRITE operation test
>       libqos/virtio: return length written into used descriptor
>       tests: virtio-9p: add FLUSH operation test
> 
> 
>  hw/9pfs/9p-synth.c       |   56 ++++++++++
>  hw/9pfs/9p-synth.h       |   11 ++
>  hw/9pfs/9p.c             |    1 
>  tests/libqos/virtio.c    |   25 +++-
>  tests/libqos/virtio.h    |    3 -
>  tests/virtio-9p-test.c   |  263 ++++++++++++++++++++++++++++++++++++++++------
>  tests/virtio-blk-test.c  |   24 ++--
>  tests/virtio-net-test.c  |    6 +
>  tests/virtio-scsi-test.c |    3 -
>  9 files changed, 335 insertions(+), 57 deletions(-)
> 
> 

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>

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Re: [Qemu-devel] [PATCH 5/7] tests: virtio-9p: add WRITE operation test

[Greg Kurz]

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On Mon, 29 Jan 2018 21:14:31 +0000
Stefan Hajnoczi <stefanha@gmail.com> wrote:

> On Wed, Jan 24, 2018 at 12:39:23AM +0100, Greg Kurz wrote:
> > +/* size[4] Twrite tag[2] fid[4] offset[8] count[4] data[count] */
> > +static P9Req *v9fs_twrite(QVirtIO9P *v9p, uint32_t fid, uint64_t offset,
> > +                          uint32_t count, const void *data, uint16_t tag)
> > +{
> > +    P9Req *req;
> > +
> > +    req = v9fs_req_init(v9p,  4 + 8 + 4 + count, P9_TWRITE, tag);  
> 
> (uint32_t)(4 + 8 + 4 + (uint32_t)count) can overflow.  I didn't look
> closely at the code and it's just a test case, but it seems safer to use
> types that avoid overflows or to handle them explicitly.
> 
> It may not be an issue in a test case, but if someone copy pastes this
> code it could become a security issue.

You're right. I'll add something like:

    uint32_t body_size = 4 + 8 + 4;

    g_assert_cmpint(body_size, <=, UINT32_MAX - count);

and I now realize that several other places in this file need
a similar change.

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