virtio,vhost: fixes, features, cleanups.

FLR support.
 Misc fixes, cleanups.
 
 Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Merge remote-tracking branch 'remotes/mst/tags/for_upstream' into staging

virtio,vhost: fixes, features, cleanups.

FLR support.
Misc fixes, cleanups.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

# gpg: Signature made Wed 04 Sep 2019 12:53:35 BST
# gpg:                using RSA key 281F0DB8D28D5469
# gpg: Good signature from "Michael S. Tsirkin <mst@kernel.org>" [full]
# gpg:                 aka "Michael S. Tsirkin <mst@redhat.com>" [full]
# Primary key fingerprint: 0270 606B 6F3C DF3D 0B17  0970 C350 3912 AFBE 8E67
#      Subkey fingerprint: 5D09 FD08 71C8 F85B 94CA  8A0D 281F 0DB8 D28D 5469

* remotes/mst/tags/for_upstream:
  libvhost-user: introduce and use vu_has_protocol_feature()
  libvhost-user: fix SLAVE_SEND_FD handling
  virtio-pci: Add Function Level Reset support
  virtio-rng: change default backend to rng-builtin
  virtio-rng: Keep the default backend out of VirtIORNGConf
  rng-builtin: add an RNG backend that uses qemu_guest_getrandom()

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

backends/Makefile.objs

@@ -1,4 +1,4 @@
-common-obj-y += rng.o rng-egd.o
+common-obj-y += rng.o rng-egd.o rng-builtin.o
 common-obj-$(CONFIG_POSIX) += rng-random.o
 
 common-obj-$(CONFIG_TPM) += tpm.o

backends/rng-builtin.c

@@ -0,0 +1,77 @@
+/*
+ * QEMU Builtin Random Number Generator Backend
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "sysemu/rng.h"
+#include "qemu/main-loop.h"
+#include "qemu/guest-random.h"
+
+#define RNG_BUILTIN(obj) OBJECT_CHECK(RngBuiltin, (obj), TYPE_RNG_BUILTIN)
+
+typedef struct RngBuiltin {
+    RngBackend parent;
+    QEMUBH *bh;
+} RngBuiltin;
+
+static void rng_builtin_receive_entropy_bh(void *opaque)
+{
+    RngBuiltin *s = opaque;
+
+    while (!QSIMPLEQ_EMPTY(&s->parent.requests)) {
+        RngRequest *req = QSIMPLEQ_FIRST(&s->parent.requests);
+
+        qemu_guest_getrandom_nofail(req->data, req->size);
+
+        req->receive_entropy(req->opaque, req->data, req->size);
+
+        rng_backend_finalize_request(&s->parent, req);
+    }
+}
+
+static void rng_builtin_request_entropy(RngBackend *b, RngRequest *req)
+{
+    RngBuiltin *s = RNG_BUILTIN(b);
+
+    qemu_bh_schedule(s->bh);
+}
+
+static void rng_builtin_init(Object *obj)
+{
+    RngBuiltin *s = RNG_BUILTIN(obj);
+
+    s->bh = qemu_bh_new(rng_builtin_receive_entropy_bh, s);
+}
+
+static void rng_builtin_finalize(Object *obj)
+{
+    RngBuiltin *s = RNG_BUILTIN(obj);
+
+    qemu_bh_delete(s->bh);
+}
+
+static void rng_builtin_class_init(ObjectClass *klass, void *data)
+{
+    RngBackendClass *rbc = RNG_BACKEND_CLASS(klass);
+
+    rbc->request_entropy = rng_builtin_request_entropy;
+}
+
+static const TypeInfo rng_builtin_info = {
+    .name = TYPE_RNG_BUILTIN,
+    .parent = TYPE_RNG_BACKEND,
+    .instance_size = sizeof(RngBuiltin),
+    .instance_init = rng_builtin_init,
+    .instance_finalize = rng_builtin_finalize,
+    .class_init = rng_builtin_class_init,
+};
+
+static void register_types(void)
+{
+    type_register_static(&rng_builtin_info);
+}
+
+type_init(register_types);

contrib/libvhost-user/libvhost-user.c

@@ -94,6 +94,11 @@ bool vu_has_feature(VuDev *dev,
     return has_feature(dev->features, fbit);
 }
 
+static inline bool vu_has_protocol_feature(VuDev *dev, unsigned int fbit)
+{
+    return has_feature(dev->protocol_features, fbit);
+}
+
 static const char *
 vu_request_to_string(unsigned int req)
 {
@@ -951,8 +956,7 @@ vu_check_queue_inflights(VuDev *dev, VuVirtq *vq)
 {
     int i = 0;
 
-    if (!has_feature(dev->protocol_features,
-        VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD)) {
+    if (!vu_has_protocol_feature(dev, VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD)) {
         return 0;
     }
 
@@ -1097,7 +1101,7 @@ bool vu_set_queue_host_notifier(VuDev *dev, VuVirtq *vq, int fd,
 
     vmsg.fd_num = fd_num;
 
-    if ((dev->protocol_features & VHOST_USER_PROTOCOL_F_SLAVE_SEND_FD) == 0) {
+    if (!vu_has_protocol_feature(dev, VHOST_USER_PROTOCOL_F_SLAVE_SEND_FD)) {
         return false;
     }
 
@@ -2190,8 +2194,7 @@ vu_queue_map_desc(VuDev *dev, VuVirtq *vq, unsigned int idx, size_t sz)
 static int
 vu_queue_inflight_get(VuDev *dev, VuVirtq *vq, int desc_idx)
 {
-    if (!has_feature(dev->protocol_features,
-        VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD)) {
+    if (!vu_has_protocol_feature(dev, VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD)) {
         return 0;
     }
 
@@ -2208,8 +2211,7 @@ vu_queue_inflight_get(VuDev *dev, VuVirtq *vq, int desc_idx)
 static int
 vu_queue_inflight_pre_put(VuDev *dev, VuVirtq *vq, int desc_idx)
 {
-    if (!has_feature(dev->protocol_features,
-        VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD)) {
+    if (!vu_has_protocol_feature(dev, VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD)) {
         return 0;
     }
 
@@ -2225,8 +2227,7 @@ vu_queue_inflight_pre_put(VuDev *dev, VuVirtq *vq, int desc_idx)
 static int
 vu_queue_inflight_post_put(VuDev *dev, VuVirtq *vq, int desc_idx)
 {
-    if (!has_feature(dev->protocol_features,
-        VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD)) {
+    if (!vu_has_protocol_feature(dev, VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD)) {
         return 0;
     }
 

hw/core/machine.c

@@ -27,7 +27,9 @@
 #include "hw/pci/pci.h"
 #include "hw/mem/nvdimm.h"
 
-GlobalProperty hw_compat_4_1[] = {};
+GlobalProperty hw_compat_4_1[] = {
+    { "virtio-pci", "x-pcie-flr-init", "off" },
+};
 const size_t hw_compat_4_1_len = G_N_ELEMENTS(hw_compat_4_1);
 
 GlobalProperty hw_compat_4_0[] = {

hw/virtio/virtio-pci.c

@@ -604,6 +604,10 @@ static void virtio_write_config(PCIDevice *pci_dev, uint32_t address,
 
     pci_default_write_config(pci_dev, address, val, len);
 
+    if (proxy->flags & VIRTIO_PCI_FLAG_INIT_FLR) {
+        pcie_cap_flr_write_config(pci_dev, address, val, len);
+    }
+
     if (range_covers_byte(address, len, PCI_COMMAND) &&
         !(pci_dev->config[PCI_COMMAND] & PCI_COMMAND_MASTER)) {
         virtio_pci_stop_ioeventfd(proxy);
@@ -1780,6 +1784,10 @@ static void virtio_pci_realize(PCIDevice *pci_dev, Error **errp)
             pcie_ats_init(pci_dev, 256);
         }
 
+        if (proxy->flags & VIRTIO_PCI_FLAG_INIT_FLR) {
+            /* Set Function Level Reset capability bit */
+            pcie_cap_flr_init(pci_dev);
+        }
     } else {
         /*
          * make future invocations of pci_is_express() return false
@@ -1847,6 +1855,8 @@ static Property virtio_pci_properties[] = {
                     VIRTIO_PCI_FLAG_INIT_LNKCTL_BIT, true),
     DEFINE_PROP_BIT("x-pcie-pm-init", VirtIOPCIProxy, flags,
                     VIRTIO_PCI_FLAG_INIT_PM_BIT, true),
+    DEFINE_PROP_BIT("x-pcie-flr-init", VirtIOPCIProxy, flags,
+                    VIRTIO_PCI_FLAG_INIT_FLR_BIT, true),
     DEFINE_PROP_END_OF_LIST(),
 };
 

hw/virtio/virtio-pci.h

@@ -44,6 +44,7 @@ enum {
     VIRTIO_PCI_FLAG_INIT_DEVERR_BIT,
     VIRTIO_PCI_FLAG_INIT_LNKCTL_BIT,
     VIRTIO_PCI_FLAG_INIT_PM_BIT,
+    VIRTIO_PCI_FLAG_INIT_FLR_BIT,
 };
 
 /* Need to activate work-arounds for buggy guests at vmstate load. */
@@ -80,6 +81,9 @@ enum {
 /* Init Power Management */
 #define VIRTIO_PCI_FLAG_INIT_PM (1 << VIRTIO_PCI_FLAG_INIT_PM_BIT)
 
+/* Init Function Level Reset capability */
+#define VIRTIO_PCI_FLAG_INIT_FLR (1 << VIRTIO_PCI_FLAG_INIT_FLR_BIT)
+
 typedef struct {
     MSIMessage msg;
     int virq;

hw/virtio/virtio-rng.c

@@ -192,27 +192,24 @@ static void virtio_rng_device_realize(DeviceState *dev, Error **errp)
     }
 
     if (vrng->conf.rng == NULL) {
-        vrng->conf.default_backend = RNG_RANDOM(object_new(TYPE_RNG_RANDOM));
+        Object *default_backend = object_new(TYPE_RNG_BUILTIN);
 
-        user_creatable_complete(USER_CREATABLE(vrng->conf.default_backend),
+        user_creatable_complete(USER_CREATABLE(default_backend),
                                 &local_err);
         if (local_err) {
             error_propagate(errp, local_err);
-            object_unref(OBJECT(vrng->conf.default_backend));
+            object_unref(default_backend);
             return;
         }
 
-        object_property_add_child(OBJECT(dev),
-                                  "default-backend",
-                                  OBJECT(vrng->conf.default_backend),
-                                  NULL);
+        object_property_add_child(OBJECT(dev), "default-backend",
+                                  default_backend, &error_abort);
 
         /* The child property took a reference, we can safely drop ours now */
-        object_unref(OBJECT(vrng->conf.default_backend));
+        object_unref(default_backend);
 
-        object_property_set_link(OBJECT(dev),
-                                 OBJECT(vrng->conf.default_backend),
-                                 "rng", NULL);
+        object_property_set_link(OBJECT(dev), default_backend,
+                                 "rng", &error_abort);
     }
 
     vrng->rng = vrng->conf.rng;

include/hw/virtio/virtio-rng.h

@@ -14,7 +14,6 @@
 
 #include "hw/virtio/virtio.h"
 #include "sysemu/rng.h"
-#include "sysemu/rng-random.h"
 #include "standard-headers/linux/virtio_rng.h"
 
 #define TYPE_VIRTIO_RNG "virtio-rng-device"
@@ -27,7 +26,6 @@ struct VirtIORNGConf {
     RngBackend *rng;
     uint64_t max_bytes;
     uint32_t period_ms;
-    RngRandom *default_backend;
 };
 
 typedef struct VirtIORNG {

include/sysemu/rng.h

@@ -24,6 +24,8 @@
 #define RNG_BACKEND_CLASS(klass) \
     OBJECT_CLASS_CHECK(RngBackendClass, (klass), TYPE_RNG_BACKEND)
 
+#define TYPE_RNG_BUILTIN "rng-builtin"
+
 typedef struct RngRequest RngRequest;
 typedef struct RngBackendClass RngBackendClass;
 typedef struct RngBackend RngBackend;

qemu-options.hx

@@ -4332,6 +4332,13 @@ other options.
 
 The @option{share} boolean option is @var{on} by default with memfd.
 
+@item -object rng-builtin,id=@var{id}
+
+Creates a random number generator backend which obtains entropy from
+QEMU builtin functions. The @option{id} parameter is a unique ID that
+will be used to reference this entropy backend from the @option{virtio-rng}
+device. By default, the @option{virtio-rng} device uses this RNG backend.
+
 @item -object rng-random,id=@var{id},filename=@var{/dev/random}
 
 Creates a random number generator backend which obtains entropy from