Dor Laor wrote: > Anthony Liguori wrote: > >> Hi Dor, >> >> I can't tell if you made any changes to this series. I have to look >> back to my notes, but I believe it would be okay to pull this series >> into KVM. I still need to spend some time updating the patchset to be >> more friendly for QEMU though before resubmitting to qemu-devel. Any >> help on making it more cross-architecture friendly would be appreciated! >> >> > Hi, > > I didn't do any change (except maybe very very minor adjustments for it > to match existing version, nothing risky). > The reason I sent it as it is + non-qemu-standard performance > optimization is to finally have descent performance for KVM IO. > My next step is to add backward compatibility support for older guests > and then to implement host kernel module for network. >
I have backports up to 2.6.18 although I need to write the awk scripts to make it automatic. If you can wait until the middle of the week when I get back into the office, I'll post it. Regards, Anthony Liguori > I hope that someone will pick up the qemu part since it's important too, > especially the block device and new devices too. > There is also work in progress to move the balloon driver over virtio. > Thanks, > Dor. > >> Regards, >> >> Anthony Liguori >> >> [EMAIL PROTECTED] wrote: >> >>> From: Dor Laor <[EMAIL PROTECTED]> >>> >>> This patch implements the basic infrastructure for virtio devices. >>> These >>> devices are exposed to the guest as real PCI devices. The PCI >>> vendor/device >>> IDs have been donated by Qumranet and the subsystem IDs are used to >>> distinguish >>> the virtio device itself. >>> >>> Virtio provides an abstraction for performing guest=>host and >>> host=>guest >>> communications. It also provides a standard ring queue interface and >>> discovery >>> mechanism. Finally, virtio provides a simple mechanism for passing >>> configuration between host and guest. >>> >>> In this virtio implementation, we provide these things via normal PCI >>> operations. The Linux kernel support for this virtio device is >>> pending in >>> Rusty's virtio patch queue[1]. They should be submitted once the >>> merge window >>> opens again. >>> >>> Some future TODOs are to use endian/alignment safe routines when >>> accessing the >>> virtqueue so that mixed mode host/guests are supported. >>> >>> [1] http://ozlabs.org/~rusty/kernel/hg >>> >>> Signed-off-by: Anthony Liguori <[EMAIL PROTECTED]> >>> Cc: Rusty Russell <[EMAIL PROTECTED]> >>> Cc: Avi Kivity <[EMAIL PROTECTED]> >>> Cc: Dor Laor <[EMAIL PROTECTED]> >>> --- >>> qemu/Makefile.target | 3 + >>> qemu/hw/virtio.c | 422 >>> ++++++++++++++++++++++++++++++++++++++++++++++++++ >>> qemu/hw/virtio.h | 143 +++++++++++++++++ >>> 3 files changed, 568 insertions(+), 0 deletions(-) >>> create mode 100644 qemu/hw/virtio.c >>> create mode 100644 qemu/hw/virtio.h >>> >>> diff --git a/qemu/Makefile.target b/qemu/Makefile.target >>> index 12fb043..8b5853b 100644 >>> --- a/qemu/Makefile.target >>> +++ b/qemu/Makefile.target >>> @@ -463,6 +463,9 @@ VL_OBJS += rtl8139.o >>> # PCI Hypercall >>> VL_OBJS+= hypercall.o >>> >>> +# virtio devices >>> +VL_OBJS += virtio.o >>> + >>> ifeq ($(TARGET_BASE_ARCH), i386) >>> # Hardware support >>> VL_OBJS+= ide.o pckbd.o ps2.o vga.o $(SOUND_HW) dma.o >>> diff --git a/qemu/hw/virtio.c b/qemu/hw/virtio.c >>> new file mode 100644 >>> index 0000000..6a1d380 >>> --- /dev/null >>> +++ b/qemu/hw/virtio.c >>> @@ -0,0 +1,422 @@ >>> +/* >>> + * Virtio Support >>> + * >>> + * Copyright IBM, Corp. 2007 >>> + * >>> + * Authors: >>> + * Anthony Liguori <[EMAIL PROTECTED]> >>> + * >>> + * This work is licensed under the terms of the GNU GPL, version 2. >>> See >>> + * the COPYING file in the top-level directory. >>> + * >>> + */ >>> + >>> +#include <inttypes.h> >>> +#include <err.h> >>> + >>> +#include "virtio.h" >>> +#include "sysemu.h" >>> + >>> +/* from Linux's linux/virtio_pci.h */ >>> + >>> +/* A 32-bit r/o bitmask of the features supported by the host */ >>> +#define VIRTIO_PCI_HOST_FEATURES 0 >>> + >>> +/* A 32-bit r/w bitmask of features activated by the guest */ >>> +#define VIRTIO_PCI_GUEST_FEATURES 4 >>> + >>> +/* A 32-bit r/w PFN for the currently selected queue */ >>> +#define VIRTIO_PCI_QUEUE_PFN 8 >>> + >>> +/* A 16-bit r/o queue size for the currently selected queue */ >>> +#define VIRTIO_PCI_QUEUE_NUM 12 >>> + >>> +/* A 16-bit r/w queue selector */ >>> +#define VIRTIO_PCI_QUEUE_SEL 14 >>> + >>> +/* A 16-bit r/w queue notifier */ >>> +#define VIRTIO_PCI_QUEUE_NOTIFY 16 >>> + >>> +/* An 8-bit device status register. */ >>> +#define VIRTIO_PCI_STATUS 18 >>> + >>> +/* An 8-bit r/o interrupt status register. Reading the value will >>> return the >>> + * current contents of the ISR and will also clear it. This is >>> effectively >>> + * a read-and-acknowledge. */ >>> +#define VIRTIO_PCI_ISR 19 >>> + >>> +#define VIRTIO_PCI_CONFIG 20 >>> + >>> +/* QEMU doesn't strictly need write barriers since everything runs in >>> + * lock-step. We'll leave the calls to wmb() in though to make it >>> obvious for >>> + * KVM or if kqemu gets SMP support. >>> + */ >>> +#define wmb() do { } while (0) >>> + >>> +/* virt queue functions */ >>> + >>> +static void virtqueue_init(VirtQueue *vq, void *p) >>> +{ >>> + vq->vring.desc = p; >>> + vq->vring.avail = p + vq->vring.num * sizeof(VRingDesc); >>> + vq->vring.used = (void *)TARGET_PAGE_ALIGN((unsigned >>> long)&vq->vring.avail->ring[vq->vring.num]); >>> +} >>> + >>> +static unsigned virtqueue_next_desc(VirtQueue *vq, unsigned int i) >>> +{ >>> + unsigned int next; >>> + >>> + /* If this descriptor says it doesn't chain, we're done. */ >>> + if (!(vq->vring.desc[i].flags & VRING_DESC_F_NEXT)) >>> + return vq->vring.num; >>> + >>> + /* Check they're not leading us off end of descriptors. */ >>> + next = vq->vring.desc[i].next; >>> + /* Make sure compiler knows to grab that: we don't want it >>> changing! */ >>> + wmb(); >>> + >>> + if (next >= vq->vring.num) >>> + errx(1, "Desc next is %u", next); >>> + >>> + return next; >>> +} >>> + >>> +void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem, >>> + unsigned int len) >>> +{ >>> + VRingUsedElem *used; >>> + >>> + /* Get a pointer to the next entry in the used ring. */ >>> + used = &vq->vring.used->ring[vq->vring.used->idx % vq->vring.num]; >>> + used->id = elem->index; >>> + used->len = len; >>> + /* Make sure buffer is written before we update index. */ >>> + wmb(); >>> + vq->vring.used->idx++; >>> +} >>> + >>> +int virtqueue_pop(VirtQueue *vq, VirtQueueElement *elem) >>> +{ >>> + unsigned int i, head; >>> + unsigned int position; >>> + >>> + /* Check it isn't doing very strange things with descriptor >>> numbers. */ >>> + if ((uint16_t)(vq->vring.avail->idx - vq->last_avail_idx) > >>> vq->vring.num) >>> + errx(1, "Guest moved used index from %u to %u", >>> + vq->last_avail_idx, vq->vring.avail->idx); >>> + >>> + /* If there's nothing new since last we looked, return invalid. */ >>> + if (vq->vring.avail->idx == vq->last_avail_idx) >>> + return 0; >>> + >>> + /* Grab the next descriptor number they're advertising, and >>> increment >>> + * the index we've seen. */ >>> + head = vq->vring.avail->ring[vq->last_avail_idx++ % vq->vring.num]; >>> + >>> + /* If their number is silly, that's a fatal mistake. */ >>> + if (head >= vq->vring.num) >>> + errx(1, "Guest says index %u is available", head); >>> + >>> + /* When we start there are none of either input nor output. */ >>> + position = elem->out_num = elem->in_num = 0; >>> + >>> + i = head; >>> + do { >>> + struct iovec *sg; >>> + >>> + if ((vq->vring.desc[i].addr + vq->vring.desc[i].len) > ram_size) >>> + errx(1, "Guest sent invalid pointer"); >>> + >>> + if (vq->vring.desc[i].flags & VRING_DESC_F_WRITE) >>> + sg = &elem->in_sg[elem->in_num++]; >>> + else >>> + sg = &elem->out_sg[elem->out_num++]; >>> + >>> + /* Grab the first descriptor, and check it's OK. */ >>> + sg->iov_len = vq->vring.desc[i].len; >>> + sg->iov_base = phys_ram_base + vq->vring.desc[i].addr; >>> + >>> + /* If we've got too many, that implies a descriptor loop. */ >>> + if ((elem->in_num + elem->out_num) > vq->vring.num) >>> + errx(1, "Looped descriptor"); >>> + } while ((i = virtqueue_next_desc(vq, i)) != vq->vring.num); >>> + >>> + elem->index = head; >>> + >>> + return elem->in_num + elem->out_num; >>> +} >>> + >>> +/* virtio device */ >>> + >>> +static VirtIODevice *to_virtio_device(PCIDevice *pci_dev) >>> +{ >>> + return (VirtIODevice *)pci_dev; >>> +} >>> + >>> +static void virtio_update_irq(VirtIODevice *vdev) >>> +{ >>> + qemu_set_irq(vdev->pci_dev.irq[0], vdev->isr & 1); >>> +} >>> + >>> +static void virtio_ioport_write(void *opaque, uint32_t addr, >>> uint32_t val) >>> +{ >>> + VirtIODevice *vdev = to_virtio_device(opaque); >>> + ram_addr_t pa; >>> + >>> + addr -= vdev->addr; >>> + >>> + switch (addr) { >>> + case VIRTIO_PCI_GUEST_FEATURES: >>> + if (vdev->set_features) >>> + vdev->set_features(vdev, val); >>> + vdev->features = val; >>> + break; >>> + case VIRTIO_PCI_QUEUE_PFN: >>> + pa = (ram_addr_t)val << TARGET_PAGE_BITS; >>> + vdev->vq[vdev->queue_sel].pfn = val; >>> + if (pa == 0) { >>> + vdev->vq[vdev->queue_sel].vring.desc = NULL; >>> + vdev->vq[vdev->queue_sel].vring.avail = NULL; >>> + vdev->vq[vdev->queue_sel].vring.used = NULL; >>> + } else if (pa < (ram_size - TARGET_PAGE_SIZE)) { >>> + virtqueue_init(&vdev->vq[vdev->queue_sel], phys_ram_base + pa); >>> + /* FIXME if pa == 0, deal with device tear down */ >>> + } >>> + break; >>> + case VIRTIO_PCI_QUEUE_SEL: >>> + if (val < VIRTIO_PCI_QUEUE_MAX) >>> + vdev->queue_sel = val; >>> + break; >>> + case VIRTIO_PCI_QUEUE_NOTIFY: >>> + if (val < VIRTIO_PCI_QUEUE_MAX && vdev->vq[val].vring.desc) >>> + vdev->vq[val].handle_output(vdev, &vdev->vq[val]); >>> + break; >>> + case VIRTIO_PCI_STATUS: >>> + vdev->status = val & 0xFF; >>> + break; >>> + } >>> +} >>> + >>> +static uint32_t virtio_ioport_read(void *opaque, uint32_t addr) >>> +{ >>> + VirtIODevice *vdev = to_virtio_device(opaque); >>> + uint32_t ret = 0xFFFFFFFF; >>> + >>> + addr -= vdev->addr; >>> + >>> + switch (addr) { >>> + case VIRTIO_PCI_HOST_FEATURES: >>> + ret = vdev->get_features(vdev); >>> + break; >>> + case VIRTIO_PCI_GUEST_FEATURES: >>> + ret = vdev->features; >>> + break; >>> + case VIRTIO_PCI_QUEUE_PFN: >>> + ret = vdev->vq[vdev->queue_sel].pfn; >>> + break; >>> + case VIRTIO_PCI_QUEUE_NUM: >>> + ret = vdev->vq[vdev->queue_sel].vring.num; >>> + break; >>> + case VIRTIO_PCI_QUEUE_SEL: >>> + ret = vdev->queue_sel; >>> + break; >>> + case VIRTIO_PCI_STATUS: >>> + ret = vdev->status; >>> + break; >>> + case VIRTIO_PCI_ISR: >>> + /* reading from the ISR also clears it. */ >>> + ret = vdev->isr; >>> + vdev->isr = 0; >>> + virtio_update_irq(vdev); >>> + break; >>> + default: >>> + break; >>> + } >>> + >>> + return ret; >>> +} >>> + >>> +static uint32_t virtio_config_readb(void *opaque, uint32_t addr) >>> +{ >>> + VirtIODevice *vdev = opaque; >>> + uint8_t val; >>> + >>> + addr -= vdev->addr + VIRTIO_PCI_CONFIG; >>> + if (addr > (vdev->config_len - sizeof(val))) >>> + return (uint32_t)-1; >>> + >>> + memcpy(&val, vdev->config + addr, sizeof(val)); >>> + return val; >>> +} >>> + >>> +static uint32_t virtio_config_readw(void *opaque, uint32_t addr) >>> +{ >>> + VirtIODevice *vdev = opaque; >>> + uint16_t val; >>> + >>> + addr -= vdev->addr + VIRTIO_PCI_CONFIG; >>> + if (addr > (vdev->config_len - sizeof(val))) >>> + return (uint32_t)-1; >>> + >>> + memcpy(&val, vdev->config + addr, sizeof(val)); >>> + return val; >>> +} >>> + >>> +static uint32_t virtio_config_readl(void *opaque, uint32_t addr) >>> +{ >>> + VirtIODevice *vdev = opaque; >>> + uint32_t val; >>> + >>> + addr -= vdev->addr + VIRTIO_PCI_CONFIG; >>> + if (addr > (vdev->config_len - sizeof(val))) >>> + return (uint32_t)-1; >>> + >>> + memcpy(&val, vdev->config + addr, sizeof(val)); >>> + return val; >>> +} >>> + >>> +static void virtio_config_writeb(void *opaque, uint32_t addr, >>> uint32_t data) >>> +{ >>> + VirtIODevice *vdev = opaque; >>> + uint8_t val = data; >>> + >>> + addr -= vdev->addr + VIRTIO_PCI_CONFIG; >>> + if (addr > (vdev->config_len - sizeof(val))) >>> + return; >>> + >>> + memcpy(vdev->config + addr, &val, sizeof(val)); >>> +} >>> + >>> +static void virtio_config_writew(void *opaque, uint32_t addr, >>> uint32_t data) >>> +{ >>> + VirtIODevice *vdev = opaque; >>> + uint16_t val = data; >>> + >>> + addr -= vdev->addr + VIRTIO_PCI_CONFIG; >>> + if (addr > (vdev->config_len - sizeof(val))) >>> + return; >>> + >>> + memcpy(vdev->config + addr, &val, sizeof(val)); >>> +} >>> + >>> +static void virtio_config_writel(void *opaque, uint32_t addr, >>> uint32_t data) >>> +{ >>> + VirtIODevice *vdev = opaque; >>> + uint32_t val = data; >>> + >>> + addr -= vdev->addr + VIRTIO_PCI_CONFIG; >>> + if (addr > (vdev->config_len - sizeof(val))) >>> + return; >>> + >>> + memcpy(vdev->config + addr, &val, sizeof(val)); >>> +} >>> + >>> +static void virtio_map(PCIDevice *pci_dev, int region_num, >>> + uint32_t addr, uint32_t size, int type) >>> +{ >>> + VirtIODevice *vdev = to_virtio_device(pci_dev); >>> + int i; >>> + >>> + vdev->addr = addr; >>> + for (i = 0; i < 3; i++) { >>> + register_ioport_write(addr, 20, 1 << i, virtio_ioport_write, vdev); >>> + register_ioport_read(addr, 20, 1 << i, virtio_ioport_read, vdev); >>> + } >>> + >>> + if (vdev->config_len) { >>> + register_ioport_write(addr + 20, vdev->config_len, 1, >>> + virtio_config_writeb, vdev); >>> + register_ioport_write(addr + 20, vdev->config_len, 2, >>> + virtio_config_writew, vdev); >>> + register_ioport_write(addr + 20, vdev->config_len, 4, >>> + virtio_config_writel, vdev); >>> + register_ioport_read(addr + 20, vdev->config_len, 1, >>> + virtio_config_readb, vdev); >>> + register_ioport_read(addr + 20, vdev->config_len, 2, >>> + virtio_config_readw, vdev); >>> + register_ioport_read(addr + 20, vdev->config_len, 4, >>> + virtio_config_readl, vdev); >>> + >>> + vdev->update_config(vdev, vdev->config); >>> + } >>> +} >>> + >>> +VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size, >>> + void (*handle_output)(VirtIODevice *, VirtQueue *)) >>> +{ >>> + int i; >>> + >>> + for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { >>> + if (vdev->vq[i].vring.num == 0) >>> + break; >>> + } >>> + >>> + if (i == VIRTIO_PCI_QUEUE_MAX || queue_size > VIRTQUEUE_MAX_SIZE) >>> + abort(); >>> + >>> + vdev->vq[i].vring.num = queue_size; >>> + vdev->vq[i].handle_output = handle_output; >>> + vdev->vq[i].index = i; >>> + >>> + return &vdev->vq[i]; >>> +} >>> + >>> +void virtio_notify(VirtIODevice *vdev, VirtQueue *vq) >>> +{ >>> + if (vq->vring.avail->flags & VRING_AVAIL_F_NO_INTERRUPT) >>> + return; >>> + >>> + vdev->isr = 1; >>> + virtio_update_irq(vdev); >>> +} >>> + >>> +VirtIODevice *virtio_init_pci(PCIBus *bus, const char *name, >>> + uint16_t vendor, uint16_t device, >>> + uint16_t subvendor, uint16_t subdevice, >>> + uint8_t class_code, uint8_t subclass_code, >>> + uint8_t pif, size_t config_size, >>> + size_t struct_size) >>> +{ >>> + VirtIODevice *vdev; >>> + PCIDevice *pci_dev; >>> + uint8_t *config; >>> + >>> + pci_dev = pci_register_device(bus, name, struct_size, >>> + -1, NULL, NULL); >>> + vdev = to_virtio_device(pci_dev); >>> + >>> + vdev->status = 0; >>> + vdev->isr = 0; >>> + vdev->queue_sel = 0; >>> + memset(vdev->vq, 0, sizeof(vdev->vq)); >>> + >>> + config = pci_dev->config; >>> + config[0x00] = vendor & 0xFF; >>> + config[0x01] = (vendor >> 8) & 0xFF; >>> + config[0x02] = device & 0xFF; >>> + config[0x03] = (device >> 8) & 0xFF; >>> + >>> + config[0x09] = pif; >>> + config[0x0a] = subclass_code; >>> + config[0x0b] = class_code; >>> + config[0x0e] = 0x00; >>> + >>> + config[0x2c] = subvendor & 0xFF; >>> + config[0x2d] = (subvendor >> 8) & 0xFF; >>> + config[0x2e] = subdevice & 0xFF; >>> + config[0x2f] = (subdevice >> 8) & 0xFF; >>> + >>> + config[0x3d] = 1; >>> + >>> + vdev->name = name; >>> + vdev->config_len = config_size; >>> + if (vdev->config_len) >>> + vdev->config = qemu_mallocz(config_size); >>> + else >>> + vdev->config = NULL; >>> + >>> + pci_register_io_region(pci_dev, 0, 20 + config_size, >>> PCI_ADDRESS_SPACE_IO, >>> + virtio_map); >>> + >>> + return vdev; >>> +} >>> diff --git a/qemu/hw/virtio.h b/qemu/hw/virtio.h >>> new file mode 100644 >>> index 0000000..dee97ba >>> --- /dev/null >>> +++ b/qemu/hw/virtio.h >>> @@ -0,0 +1,143 @@ >>> +/* >>> + * Virtio Support >>> + * >>> + * Copyright IBM, Corp. 2007 >>> + * >>> + * Authors: >>> + * Anthony Liguori <[EMAIL PROTECTED]> >>> + * >>> + * This work is licensed under the terms of the GNU GPL, version 2. >>> See >>> + * the COPYING file in the top-level directory. >>> + * >>> + */ >>> + >>> +#ifndef _QEMU_VIRTIO_H >>> +#define _QEMU_VIRTIO_H >>> + >>> +#include <sys/uio.h> >>> +#include "hw.h" >>> +#include "pci.h" >>> + >>> +/* from Linux's linux/virtio_config.h */ >>> + >>> +/* Status byte for guest to report progress, and synchronize >>> features. */ >>> +/* We have seen device and processed generic fields >>> (VIRTIO_CONFIG_F_VIRTIO) */ >>> +#define VIRTIO_CONFIG_S_ACKNOWLEDGE 1 >>> +/* We have found a driver for the device. */ >>> +#define VIRTIO_CONFIG_S_DRIVER 2 >>> +/* Driver has used its parts of the config, and is happy */ >>> +#define VIRTIO_CONFIG_S_DRIVER_OK 4 >>> +/* We've given up on this device. */ >>> +#define VIRTIO_CONFIG_S_FAILED 0x80 >>> + >>> +/* from Linux's linux/virtio_ring.h */ >>> + >>> +/* This marks a buffer as continuing via the next field. */ >>> +#define VRING_DESC_F_NEXT 1 >>> +/* This marks a buffer as write-only (otherwise read-only). */ >>> +#define VRING_DESC_F_WRITE 2 >>> + >>> +/* This means don't notify other side when buffer added. */ >>> +#define VRING_USED_F_NO_NOTIFY 1 >>> +/* This means don't interrupt guest when buffer consumed. */ >>> +#define VRING_AVAIL_F_NO_INTERRUPT 1 >>> + >>> +typedef struct VirtQueue VirtQueue; >>> +typedef struct VirtIODevice VirtIODevice; >>> + >>> +typedef struct VRingDesc >>> +{ >>> + uint64_t addr; >>> + uint32_t len; >>> + uint16_t flags; >>> + uint16_t next; >>> +} VRingDesc; >>> + >>> +typedef struct VRingAvail >>> +{ >>> + uint16_t flags; >>> + uint16_t idx; >>> + uint16_t ring[0]; >>> +} VRingAvail; >>> + >>> +typedef struct VRingUsedElem >>> +{ >>> + uint32_t id; >>> + uint32_t len; >>> +} VRingUsedElem; >>> + >>> +typedef struct VRingUsed >>> +{ >>> + uint16_t flags; >>> + uint16_t idx; >>> + VRingUsedElem ring[0]; >>> +} VRingUsed; >>> + >>> +typedef struct VRing >>> +{ >>> + unsigned int num; >>> + VRingDesc *desc; >>> + VRingAvail *avail; >>> + VRingUsed *used; >>> +} VRing; >>> + >>> +struct VirtQueue >>> +{ >>> + VRing vring; >>> + uint32_t pfn; >>> + uint16_t last_avail_idx; >>> + void (*handle_output)(VirtIODevice *vdev, VirtQueue *vq); >>> + int index; >>> +}; >>> + >>> +#define VIRTQUEUE_MAX_SIZE 1024 >>> + >>> +typedef struct VirtQueueElement >>> +{ >>> + unsigned int index; >>> + unsigned int out_num; >>> + unsigned int in_num; >>> + struct iovec in_sg[VIRTQUEUE_MAX_SIZE]; >>> + struct iovec out_sg[VIRTQUEUE_MAX_SIZE]; >>> +} VirtQueueElement; >>> + >>> +#define VIRTIO_PCI_QUEUE_MAX 16 >>> + >>> +struct VirtIODevice >>> +{ >>> + PCIDevice pci_dev; >>> + const char *name; >>> + uint32_t addr; >>> + uint16_t vendor; >>> + uint16_t device; >>> + uint8_t status; >>> + uint8_t isr; >>> + uint16_t queue_sel; >>> + uint32_t features; >>> + size_t config_len; >>> + void *config; >>> + uint32_t (*get_features)(VirtIODevice *vdev); >>> + void (*set_features)(VirtIODevice *vdev, uint32_t val); >>> + void (*update_config)(VirtIODevice *vdev, uint8_t *config); >>> + VirtQueue vq[VIRTIO_PCI_QUEUE_MAX]; >>> +}; >>> + >>> +VirtIODevice *virtio_init_pci(PCIBus *bus, const char *name, >>> + uint16_t vendor, uint16_t device, >>> + uint16_t subvendor, uint16_t subdevice, >>> + uint8_t class_code, uint8_t subclass_code, >>> + uint8_t pif, size_t config_size, >>> + size_t struct_size); >>> + >>> +VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size, >>> + void (*handle_output)(VirtIODevice *, >>> + VirtQueue *)); >>> + >>> +void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem, >>> + unsigned int len); >>> + >>> +int virtqueue_pop(VirtQueue *vq, VirtQueueElement *elem); >>> + >>> +void virtio_notify(VirtIODevice *vdev, VirtQueue *vq); >>> + >>> +#endif >>> >>> >> > > > ------------------------------------------------------------------------- > This SF.net email is sponsored by: Microsoft > Defy all challenges. Microsoft(R) Visual Studio 2005. > http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ > _______________________________________________ > kvm-devel mailing list > kvm-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/kvm-devel > ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
