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Signed-off-by: Thanos Makatos <thanos.makatos@nutanix.com>
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/* | ||
* Copyright (c) 2022, Nutanix Inc. All rights reserved. | ||
* Author: Thanos Makatos <thanos@nutanix.com> | ||
* | ||
* Redistribution and use in source and binary forms, with or without | ||
* modification, are permitted provided that the following conditions are met: | ||
* * Redistributions of source code must retain the above copyright | ||
* notice, this list of conditions and the following disclaimer. | ||
* * Redistributions in binary form must reproduce the above copyright | ||
* notice, this list of conditions and the following disclaimer in the | ||
* documentation and/or other materials provided with the distribution. | ||
* * Neither the name of Nutanix nor the names of its contributors may be | ||
* used to endorse or promote products derived from this software without | ||
* specific prior written permission. | ||
* | ||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | ||
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | ||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | ||
* ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY | ||
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | ||
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | ||
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER | ||
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | ||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | ||
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH | ||
* DAMAGE. | ||
* | ||
*/ | ||
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/* | ||
* shadow_ioeventfd_server.c: an example of how to use a shadow ioeventfd. | ||
* There is no Linux kernel driver, use samples/shadow_ioeventfd_speed_test.c | ||
* in the guest instead. | ||
*/ | ||
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#include <stdio.h> | ||
#include <err.h> | ||
#include <stdlib.h> | ||
#include <errno.h> | ||
#include <assert.h> | ||
#include <sys/poll.h> | ||
#include <sys/eventfd.h> | ||
#include <sys/mman.h> | ||
#include <sys/syscall.h> | ||
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#include "libvfio-user.h" | ||
#include "common.h" | ||
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static void | ||
_log(vfu_ctx_t *vfu_ctx UNUSED, int level UNUSED, char const *msg) | ||
{ | ||
fprintf(stderr, "%s\n", msg); | ||
} | ||
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static ssize_t | ||
bar0_cb(vfu_ctx_t *vfu_ctx UNUSED, char * const buf UNUSED, | ||
size_t count UNUSED, loff_t offset UNUSED, | ||
const bool is_write UNUSED) | ||
{ | ||
return count; | ||
} | ||
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int | ||
main(int argc, char *argv[]) | ||
{ | ||
int ret; | ||
vfu_ctx_t *vfu_ctx; | ||
struct pollfd fds[2]; /* one for vfu_ctx, one for shadow_ioeventfd */ | ||
int fd, bar0_fd; | ||
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if (argc != 2) { | ||
errx(EXIT_FAILURE, "missing vfio-user socket path"); | ||
} | ||
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vfu_ctx = vfu_create_ctx(VFU_TRANS_SOCK, argv[1], | ||
LIBVFIO_USER_FLAG_ATTACH_NB, NULL, | ||
VFU_DEV_TYPE_PCI); | ||
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if (vfu_ctx == NULL) { | ||
err(EXIT_FAILURE, "failed to initialize device emulation"); | ||
} | ||
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ret = vfu_setup_log(vfu_ctx, _log, LOG_ERR); | ||
if (ret < 0) { | ||
err(EXIT_FAILURE, "failed to setup log"); | ||
} | ||
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ret = vfu_pci_init(vfu_ctx, VFU_PCI_TYPE_CONVENTIONAL, | ||
PCI_HEADER_TYPE_NORMAL, 0); | ||
if (ret < 0) { | ||
err(EXIT_FAILURE, "vfu_pci_init() failed"); | ||
} | ||
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vfu_pci_set_id(vfu_ctx, 0x4e58, 0, 0x0, 0x0); | ||
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ret = vfu_setup_region(vfu_ctx, VFU_PCI_DEV_BAR0_REGION_IDX, | ||
sysconf(_SC_PAGE_SIZE), &bar0_cb, | ||
VFU_REGION_FLAG_RW | VFU_REGION_FLAG_MEM, NULL, 0, | ||
-1, 0); | ||
if (ret < 0) { | ||
err(EXIT_FAILURE, "failed to setup region"); | ||
} | ||
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ret = vfu_realize_ctx(vfu_ctx); | ||
if (ret < 0) { | ||
err(EXIT_FAILURE, "failed to realize device"); | ||
} | ||
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fds[0] = (struct pollfd) { | ||
.fd = vfu_get_poll_fd(vfu_ctx), | ||
.events = POLLIN | POLLOUT | ||
}; | ||
ret = poll(fds, 1, -1); | ||
assert(ret == 1); | ||
ret = vfu_attach_ctx(vfu_ctx); | ||
if (ret < 0) { | ||
err(EXIT_FAILURE, "failed to attach device"); | ||
} | ||
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fd = eventfd(0, 0); | ||
if (fd == -1) { | ||
err(EXIT_FAILURE, "failed to create eventfd"); | ||
} | ||
bar0_fd = syscall(SYS_memfd_create, "BAR0", 0); | ||
if (bar0_fd == -1) { | ||
err(EXIT_FAILURE, "failed to create BAR0 file"); | ||
} | ||
ret = ftruncate(bar0_fd, sysconf(_SC_PAGESIZE)); | ||
if (ret == -1) { | ||
err(EXIT_FAILURE, "failed to truncate BAR0 file"); | ||
} | ||
ret = vfu_create_ioeventfd(vfu_ctx, VFU_PCI_DEV_BAR0_REGION_IDX, | ||
fd, 0, 4, | ||
0, false, bar0_fd, 0); | ||
if (ret == -1) { | ||
err(EXIT_FAILURE, "failed to create shadow ioeventfd"); | ||
} | ||
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fds[0] = (struct pollfd) { | ||
.fd = vfu_get_poll_fd(vfu_ctx), | ||
.events = POLLIN | ||
}; | ||
fds[1] = (struct pollfd) { | ||
.fd = fd, | ||
.events = POLLIN | ||
}; | ||
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do { | ||
ret = poll(fds, 2, -1); | ||
if (ret < 0) { | ||
err(EXIT_FAILURE, "failed to poll(2)"); | ||
} | ||
assert(ret > 0); | ||
if (fds[0].revents & (POLLIN)) { | ||
ret = vfu_run_ctx(vfu_ctx); | ||
if (ret < 0) { | ||
if (errno == EAGAIN) { | ||
continue; | ||
} | ||
if (errno == ENOTCONN) { | ||
return 0; | ||
} | ||
err(EXIT_FAILURE, "vfu_run_ctx() failed"); | ||
} | ||
} | ||
if (fds[1].revents & POLLIN) { | ||
eventfd_t value; | ||
eventfd_read(fd, &value); | ||
bar0_cb(vfu_ctx, NULL, 4, 0, true); | ||
} | ||
} while (true); | ||
return 0; | ||
} | ||
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/* ex: set tabstop=4 shiftwidth=4 softtabstop=4 expandtab: */ |
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/* | ||
* Copyright (c) 2022, Nutanix Inc. All rights reserved. | ||
* Author: Thanos Makatos <thanos@nutanix.com> | ||
* | ||
* Redistribution and use in source and binary forms, with or without | ||
* modification, are permitted provided that the following conditions are met: | ||
* * Redistributions of source code must retain the above copyright | ||
* notice, this list of conditions and the following disclaimer. | ||
* * Redistributions in binary form must reproduce the above copyright | ||
* notice, this list of conditions and the following disclaimer in the | ||
* documentation and/or other materials provided with the distribution. | ||
* * Neither the name of Nutanix nor the names of its contributors may be | ||
* used to endorse or promote products derived from this software without | ||
* specific prior written permission. | ||
* | ||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | ||
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | ||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | ||
* ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY | ||
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | ||
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | ||
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER | ||
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | ||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | ||
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH | ||
* DAMAGE. | ||
* | ||
*/ | ||
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/* | ||
* shadow_ioeventfd_speed_test.c: application that is run in the guest to | ||
* demonstrate the performance benefit of shadow ioeventfd. To be used with | ||
* shadow_ioeventfd_server.c on the host. | ||
*/ | ||
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#include <stdio.h> | ||
#include <linux/types.h> | ||
#include <linux/ioctl.h> | ||
#include <linux/vfio.h> | ||
#include <assert.h> | ||
#include <sys/types.h> | ||
#include <sys/stat.h> | ||
#include <fcntl.h> | ||
#include <sys/ioctl.h> | ||
#include <linux/limits.h> | ||
#include <stdlib.h> | ||
#include <err.h> | ||
#include <unistd.h> | ||
#include <sys/time.h> | ||
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int main(int argc, char *argv[]) | ||
{ | ||
int container = open("/dev/vfio/vfio", O_RDWR); | ||
assert(container != -1); | ||
char path[PATH_MAX]; | ||
sprintf(path, "/dev/vfio/%d", atoi(argv[1])); | ||
int group = open(path, O_RDWR); | ||
assert(group != 0); | ||
struct vfio_group_status status = { .argsz = sizeof(status) }; | ||
int ret = ioctl(group, VFIO_GROUP_GET_STATUS, &status); | ||
assert(ret != -1); | ||
assert(status.flags & VFIO_GROUP_FLAGS_VIABLE); | ||
ret = ioctl(group, VFIO_GROUP_SET_CONTAINER, &container); | ||
assert(ret != -1); | ||
ret = ioctl(container, VFIO_SET_IOMMU, VFIO_TYPE1_IOMMU); | ||
assert(ret == 0); | ||
int device = ioctl(group, VFIO_GROUP_GET_DEVICE_FD, argv[2]); | ||
assert(device >= 0); | ||
struct vfio_region_info region_info = { | ||
.argsz = sizeof(region_info), | ||
.index = 0 | ||
}; | ||
ret = ioctl(device, VFIO_DEVICE_GET_REGION_INFO, ®ion_info); | ||
assert(ret == 0); | ||
u_int32_t val = 0xdeadbeef; | ||
struct timeval t0, t1; | ||
const int count = 100000; | ||
gettimeofday(&t0, NULL); | ||
for (int i = 0; i < count; i++) { | ||
ret = pwrite(device, &val, sizeof val, region_info.offset); | ||
assert(ret == sizeof val); | ||
} | ||
gettimeofday(&t1, NULL); | ||
printf("shadow:\t%lu us\n", | ||
(t1.tv_sec - t0.tv_sec) * 1000000 + t1.tv_usec - t0.tv_usec); | ||
gettimeofday(&t0, NULL); | ||
for (int i = 0; i < count; i++) { | ||
ret = pwrite(device, &val, sizeof val, region_info.offset + 8); | ||
assert(ret == sizeof val); | ||
} | ||
gettimeofday(&t1, NULL); | ||
printf("legacy:\t%lu us\n", | ||
(t1.tv_sec - t0.tv_sec) * 1000000 + t1.tv_usec - t0.tv_usec); | ||
return 0; | ||
} | ||
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/* ex: set tabstop=4 shiftwidth=4 softtabstop=4 expandtab: */ |