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qrap: Support JSON syntax for -device

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Starting with version 8.1.0, libvirt uses JSON syntax when
generating the arguments to -device, so they will now look like

  {"driver":"virtio-scsi-pci","bus":"pci.3","addr":"0x0"}

instead of

  virtio-scsi-pci,bus=pci.3,addr=0x0

qrap needs to parse these arguments and extract the bus number
in order to figure out what address to use for the virtio-net
device it adds, and the libvirt change described above has
broken this parsing logic.

Tweak the code so that both styles are accepted and handled
correctly.

Note that, when JSON is in use, qrap needs to generate its own
command line options in that format as well or things will not
work as expected.

Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
Andrea Bolognani 2022-10-20 11:04:19 +02:00 committed by Stefano Brivio
parent c6845f60a0
commit b944ca1855
1 changed files with 41 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

51
qrap.c
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@ -69,6 +69,8 @@ static const struct drop_arg {
* @name: Device ("-device") name to insert
* @template: Prefix for device specification (first part of address)
* @template_post: Suffix for device specification (last part of address)
* @template_json: Device prefix for when JSON is used
* @template_json_post: Device suffix for when JSON is used
* @first: First usable PCI address
* @last: Last usable PCI address
*/
@ -77,15 +79,29 @@ static const struct pci_dev {
char *name;
char *template;
char *template_post;
char *template_json;
char *template_json_post;
int first;
int last;
} pci_devs[] = {
{ "pc-q35", "virtio-net-pci",
"bus=pci.", ",addr=0x0", 3, /* 2: hotplug bus */ 16 },
{ "pc-", "virtio-net-pci",
"bus=pci.0,addr=0x", "", 2, /* 1: ISA bridge */ 16 },
{ "s390-ccw", "virtio-net-ccw",
"devno=fe.0.", "", 1, 16 },
{
"pc-q35", "virtio-net-pci",
"bus=pci.", ",addr=0x0",
"\"bus\":\"pci.", ",\"addr\":\"0x0\"",
3, /* 2: hotplug bus */ 16
},
{
"pc-", "virtio-net-pci",
"bus=pci.0,addr=0x", "",
"\"bus\":\"pci.0\",\"addr=0x", "",
2, /* 1: ISA bridge */ 16
},
{
"s390-ccw", "virtio-net-ccw",
"devno=fe.0.", "",
"\"devno\":\"fe.0.", "",
1, 16
},
{ 0 },
};
@ -115,7 +131,7 @@ void usage(const char *name)
*/
int main(int argc, char **argv)
{
int i, s, qemu_argc = 0, addr_map = 0, has_dev = 0, retry_on_reset, rc;
int i, s, qemu_argc = 0, addr_map = 0, has_dev = 0, has_json = 0, retry_on_reset, rc;
struct timeval tv = { .tv_sec = 0, .tv_usec = (long)(500 * 1000) };
char *qemu_argv[ARG_MAX], dev_str[ARG_MAX];
struct sockaddr_un addr = {
@ -227,14 +243,22 @@ int main(int argc, char **argv)
}
if (!strcmp(argv[i], "-device") && i + 1 < argc) {
char *template = NULL;
char *p;
has_dev = 1;
if ((p = strstr(argv[i + 1], dev->template))) {
template = dev->template;
} else if ((p = strstr(argv[i + 1], dev->template_json))) {
template = dev->template_json;
has_json = 1;
}
if (template) {
long n;
n = strtol(p + strlen(dev->template), NULL, 16);
n = strtol(p + strlen(template), NULL, 16);
if (!errno)
addr_map |= (1 << n);
}
@ -254,8 +278,15 @@ int main(int argc, char **argv)
if (has_dev) {
qemu_argv[qemu_argc++] = "-device";
snprintf(dev_str, ARG_MAX, "%s,%s%x%s,netdev=hostnet0,x-txburst=4096",
dev->name, dev->template, i, dev->template_post);
if (!has_json) {
snprintf(dev_str, ARG_MAX,
"%s,%s%x%s,netdev=hostnet0,x-txburst=4096",
dev->name, dev->template, i, dev->template_post);
} else {
snprintf(dev_str, ARG_MAX,
"{\"driver\":\"%s\",%s%x\"%s,\"netdev\":\"hostnet0\",\"x-txburst\":4096}",
dev->name, dev->template_json, i, dev->template_json_post);
}
qemu_argv[qemu_argc++] = dev_str;
}