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[PATCH v4 3/5] virtio-scsi: default num_queues to -smp N
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From: |
Stefan Hajnoczi |
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Subject: |
[PATCH v4 3/5] virtio-scsi: default num_queues to -smp N |
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Date: |
Wed, 27 May 2020 11:29:23 +0100 |
Automatically size the number of virtio-scsi-pci, vhost-scsi-pci, and
vhost-user-scsi-pci request virtqueues to match the number of vCPUs.
Other transports continue to default to 1 request virtqueue.
A 1:1 virtqueue:vCPU mapping ensures that completion interrupts are
handled on the same vCPU that submitted the request. No IPI is
necessary to complete an I/O request and performance is improved.
Signed-off-by: Stefan Hajnoczi <address@hidden>
---
include/hw/virtio/virtio-scsi.h | 2 ++
hw/core/machine.c | 6 +++++-
hw/scsi/vhost-scsi.c | 3 ++-
hw/scsi/vhost-user-scsi.c | 3 ++-
hw/scsi/virtio-scsi.c | 6 +++++-
hw/virtio/vhost-scsi-pci.c | 10 +++++++---
hw/virtio/vhost-user-scsi-pci.c | 10 +++++++---
hw/virtio/virtio-scsi-pci.c | 10 +++++++---
8 files changed, 37 insertions(+), 13 deletions(-)
diff --git a/include/hw/virtio/virtio-scsi.h b/include/hw/virtio/virtio-scsi.h
index 9f293bcb80..c0b8e4dd7e 100644
--- a/include/hw/virtio/virtio-scsi.h
+++ b/include/hw/virtio/virtio-scsi.h
@@ -39,6 +39,8 @@
/* Number of virtqueues that are always present */
#define VIRTIO_SCSI_VQ_NUM_FIXED 2
+#define VIRTIO_SCSI_AUTO_NUM_QUEUES UINT32_MAX
+
typedef struct virtio_scsi_cmd_req VirtIOSCSICmdReq;
typedef struct virtio_scsi_cmd_resp VirtIOSCSICmdResp;
typedef struct virtio_scsi_ctrl_tmf_req VirtIOSCSICtrlTMFReq;
diff --git a/hw/core/machine.c b/hw/core/machine.c
index bb3a7b18b1..df7664bc8d 100644
--- a/hw/core/machine.c
+++ b/hw/core/machine.c
@@ -28,7 +28,11 @@
#include "hw/mem/nvdimm.h"
#include "migration/vmstate.h"
-GlobalProperty hw_compat_5_0[] = {};
+GlobalProperty hw_compat_5_0[] = {
+ { "virtio-scsi-device", "num_queues", "1"},
+ { "vhost-scsi", "num_queues", "1"},
+ { "vhost-user-scsi", "num_queues", "1"},
+};
const size_t hw_compat_5_0_len = G_N_ELEMENTS(hw_compat_5_0);
GlobalProperty hw_compat_4_2[] = {
diff --git a/hw/scsi/vhost-scsi.c b/hw/scsi/vhost-scsi.c
index c1b012aea4..5e3bc319ab 100644
--- a/hw/scsi/vhost-scsi.c
+++ b/hw/scsi/vhost-scsi.c
@@ -272,7 +272,8 @@ static Property vhost_scsi_properties[] = {
DEFINE_PROP_STRING("vhostfd", VirtIOSCSICommon, conf.vhostfd),
DEFINE_PROP_STRING("wwpn", VirtIOSCSICommon, conf.wwpn),
DEFINE_PROP_UINT32("boot_tpgt", VirtIOSCSICommon, conf.boot_tpgt, 0),
- DEFINE_PROP_UINT32("num_queues", VirtIOSCSICommon, conf.num_queues, 1),
+ DEFINE_PROP_UINT32("num_queues", VirtIOSCSICommon, conf.num_queues,
+ VIRTIO_SCSI_AUTO_NUM_QUEUES),
DEFINE_PROP_UINT32("virtqueue_size", VirtIOSCSICommon, conf.virtqueue_size,
128),
DEFINE_PROP_BOOL("seg_max_adjust", VirtIOSCSICommon, conf.seg_max_adjust,
diff --git a/hw/scsi/vhost-user-scsi.c b/hw/scsi/vhost-user-scsi.c
index f8bd158c31..4b56de97a8 100644
--- a/hw/scsi/vhost-user-scsi.c
+++ b/hw/scsi/vhost-user-scsi.c
@@ -163,7 +163,8 @@ static void vhost_user_scsi_unrealize(DeviceState *dev)
static Property vhost_user_scsi_properties[] = {
DEFINE_PROP_CHR("chardev", VirtIOSCSICommon, conf.chardev),
DEFINE_PROP_UINT32("boot_tpgt", VirtIOSCSICommon, conf.boot_tpgt, 0),
- DEFINE_PROP_UINT32("num_queues", VirtIOSCSICommon, conf.num_queues, 1),
+ DEFINE_PROP_UINT32("num_queues", VirtIOSCSICommon, conf.num_queues,
+ VIRTIO_SCSI_AUTO_NUM_QUEUES),
DEFINE_PROP_UINT32("virtqueue_size", VirtIOSCSICommon, conf.virtqueue_size,
128),
DEFINE_PROP_UINT32("max_sectors", VirtIOSCSICommon, conf.max_sectors,
diff --git a/hw/scsi/virtio-scsi.c b/hw/scsi/virtio-scsi.c
index f3d60683bd..f055ae7389 100644
--- a/hw/scsi/virtio-scsi.c
+++ b/hw/scsi/virtio-scsi.c
@@ -891,6 +891,9 @@ void virtio_scsi_common_realize(DeviceState *dev,
virtio_init(vdev, "virtio-scsi", VIRTIO_ID_SCSI,
sizeof(VirtIOSCSIConfig));
+ if (s->conf.num_queues == VIRTIO_SCSI_AUTO_NUM_QUEUES) {
+ s->conf.num_queues = 1;
+ }
if (s->conf.num_queues == 0 ||
s->conf.num_queues > VIRTIO_QUEUE_MAX - VIRTIO_SCSI_VQ_NUM_FIXED) {
error_setg(errp, "Invalid number of queues (= %" PRIu32 "), "
@@ -964,7 +967,8 @@ static void virtio_scsi_device_unrealize(DeviceState *dev)
}
static Property virtio_scsi_properties[] = {
- DEFINE_PROP_UINT32("num_queues", VirtIOSCSI, parent_obj.conf.num_queues,
1),
+ DEFINE_PROP_UINT32("num_queues", VirtIOSCSI, parent_obj.conf.num_queues,
+ VIRTIO_SCSI_AUTO_NUM_QUEUES),
DEFINE_PROP_UINT32("virtqueue_size", VirtIOSCSI,
parent_obj.conf.virtqueue_size, 256),
DEFINE_PROP_BOOL("seg_max_adjust", VirtIOSCSI,
diff --git a/hw/virtio/vhost-scsi-pci.c b/hw/virtio/vhost-scsi-pci.c
index 2b25db9a3c..9f377a84cf 100644
--- a/hw/virtio/vhost-scsi-pci.c
+++ b/hw/virtio/vhost-scsi-pci.c
@@ -47,11 +47,15 @@ static void vhost_scsi_pci_realize(VirtIOPCIProxy
*vpci_dev, Error **errp)
{
VHostSCSIPCI *dev = VHOST_SCSI_PCI(vpci_dev);
DeviceState *vdev = DEVICE(&dev->vdev);
- VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev);
+ VirtIOSCSIConf *conf = &dev->vdev.parent_obj.parent_obj.conf;
+
+ if (conf->num_queues == VIRTIO_SCSI_AUTO_NUM_QUEUES) {
+ conf->num_queues =
+ virtio_pci_optimal_num_queues(VIRTIO_SCSI_VQ_NUM_FIXED);
+ }
if (vpci_dev->nvectors == DEV_NVECTORS_UNSPECIFIED) {
- vpci_dev->nvectors = vs->conf.num_queues +
- VIRTIO_SCSI_VQ_NUM_FIXED + 1;
+ vpci_dev->nvectors = conf->num_queues + VIRTIO_SCSI_VQ_NUM_FIXED + 1;
}
qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
diff --git a/hw/virtio/vhost-user-scsi-pci.c b/hw/virtio/vhost-user-scsi-pci.c
index 80710ab170..2a4c0d27f1 100644
--- a/hw/virtio/vhost-user-scsi-pci.c
+++ b/hw/virtio/vhost-user-scsi-pci.c
@@ -53,11 +53,15 @@ static void vhost_user_scsi_pci_realize(VirtIOPCIProxy
*vpci_dev, Error **errp)
{
VHostUserSCSIPCI *dev = VHOST_USER_SCSI_PCI(vpci_dev);
DeviceState *vdev = DEVICE(&dev->vdev);
- VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev);
+ VirtIOSCSIConf *conf = &dev->vdev.parent_obj.parent_obj.conf;
+
+ if (conf->num_queues == VIRTIO_SCSI_AUTO_NUM_QUEUES) {
+ conf->num_queues =
+ virtio_pci_optimal_num_queues(VIRTIO_SCSI_VQ_NUM_FIXED);
+ }
if (vpci_dev->nvectors == DEV_NVECTORS_UNSPECIFIED) {
- vpci_dev->nvectors = vs->conf.num_queues +
- VIRTIO_SCSI_VQ_NUM_FIXED + 1;
+ vpci_dev->nvectors = conf->num_queues + VIRTIO_SCSI_VQ_NUM_FIXED + 1;
}
qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
diff --git a/hw/virtio/virtio-scsi-pci.c b/hw/virtio/virtio-scsi-pci.c
index c52d68053a..c3e2f8625a 100644
--- a/hw/virtio/virtio-scsi-pci.c
+++ b/hw/virtio/virtio-scsi-pci.c
@@ -46,13 +46,17 @@ static void virtio_scsi_pci_realize(VirtIOPCIProxy
*vpci_dev, Error **errp)
{
VirtIOSCSIPCI *dev = VIRTIO_SCSI_PCI(vpci_dev);
DeviceState *vdev = DEVICE(&dev->vdev);
- VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev);
DeviceState *proxy = DEVICE(vpci_dev);
+ VirtIOSCSIConf *conf = &dev->vdev.parent_obj.conf;
char *bus_name;
+ if (conf->num_queues == VIRTIO_SCSI_AUTO_NUM_QUEUES) {
+ conf->num_queues =
+ virtio_pci_optimal_num_queues(VIRTIO_SCSI_VQ_NUM_FIXED);
+ }
+
if (vpci_dev->nvectors == DEV_NVECTORS_UNSPECIFIED) {
- vpci_dev->nvectors = vs->conf.num_queues +
- VIRTIO_SCSI_VQ_NUM_FIXED + 1;
+ vpci_dev->nvectors = conf->num_queues + VIRTIO_SCSI_VQ_NUM_FIXED + 1;
}
/*
--
2.25.4