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Retain disk PCI address across libvirtd restarts

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When we hot-plug a disk device into a qemu guest, we need to retain its
PCI address so that it can be removed again later. Currently, we do
retain the slot number, but not across libvirtd restarts.

Add <state devaddr="xxxx:xx:xx"/> to the disk device XML config when the
VIR_DOMAIN_XML_INTERNAL_STATUS flag is used. We still don't parse the
domain and bus number, but the format allows us to do that in future.

* src/domain_conf.h: replace slotnum with pci_addr struct, add helper
  for testing whether the address is valid

* src/domain_conf.c: handle formatting and parsing the address

* src/qemu_driver.c: store the parsed slot number as a full PCI address,
  and use this address with the pci_del monitor command

* src/vbox/vbox_tmpl.c: we're debug printing slotnum here even though
  it can never be set, just delete it
This commit is contained in:
Mark McLoughlin 2009-07-17 22:08:33 +01:00
parent aa98871c77
commit 0165410712
4 changed files with 65 additions and 17 deletions
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33
src/domain_conf.c
View File

@ -643,7 +643,7 @@ int virDomainDiskCompare(virDomainDiskDefPtr a,
static virDomainDiskDefPtr
virDomainDiskDefParseXML(virConnectPtr conn,
xmlNodePtr node,
int flags ATTRIBUTE_UNUSED) {
int flags) {
virDomainDiskDefPtr def;
xmlNodePtr cur;
char *type = NULL;
@ -654,6 +654,7 @@ virDomainDiskDefParseXML(virConnectPtr conn,
char *target = NULL;
char *bus = NULL;
char *cachetag = NULL;
char *devaddr = NULL;
if (VIR_ALLOC(def) < 0) {
virReportOOMError(conn);
@ -708,6 +709,9 @@ virDomainDiskDefParseXML(virConnectPtr conn,
def->readonly = 1;
} else if (xmlStrEqual(cur->name, BAD_CAST "shareable")) {
def->shared = 1;
} else if ((flags & VIR_DOMAIN_XML_INTERNAL_STATUS) &&
xmlStrEqual(cur->name, BAD_CAST "state")) {
devaddr = virXMLPropString(cur, "devaddr");
}
}
cur = cur->next;
@ -807,6 +811,17 @@ virDomainDiskDefParseXML(virConnectPtr conn,
goto error;
}
if (devaddr &&
sscanf(devaddr, "%x:%x:%x",
&def->pci_addr.domain,
&def->pci_addr.bus,
&def->pci_addr.slot) < 3) {
virDomainReportError(conn, VIR_ERR_INTERNAL_ERROR,
_("Unable to parse devaddr parameter '%s'"),
devaddr);
goto error;
}
def->src = source;
source = NULL;
def->dst = target;
@ -825,6 +840,7 @@ cleanup:
VIR_FREE(driverType);
VIR_FREE(driverName);
VIR_FREE(cachetag);
VIR_FREE(devaddr);
return def;
@ -3388,7 +3404,8 @@ virDomainLifecycleDefFormat(virConnectPtr conn,
static int
virDomainDiskDefFormat(virConnectPtr conn,
virBufferPtr buf,
virDomainDiskDefPtr def)
virDomainDiskDefPtr def,
int flags)
{
const char *type = virDomainDiskTypeToString(def->type);
const char *device = virDomainDiskDeviceTypeToString(def->device);
@ -3446,6 +3463,16 @@ virDomainDiskDefFormat(virConnectPtr conn,
if (def->shared)
virBufferAddLit(buf, " <shareable/>\n");
if (flags & VIR_DOMAIN_XML_INTERNAL_STATUS) {
virBufferAddLit(buf, " <state");
if (virDiskHasValidPciAddr(def))
virBufferVSprintf(buf, " devaddr='%.4x:%.2x:%.2x'",
def->pci_addr.domain,
def->pci_addr.bus,
def->pci_addr.slot);
virBufferAddLit(buf, "/>\n");
}
virBufferAddLit(buf, " </disk>\n");
return 0;
@ -4048,7 +4075,7 @@ char *virDomainDefFormat(virConnectPtr conn,
def->emulator);
for (n = 0 ; n < def->ndisks ; n++)
if (virDomainDiskDefFormat(conn, &buf, def->disks[n]) < 0)
if (virDomainDiskDefFormat(conn, &buf, def->disks[n], flags) < 0)
goto cleanup;
for (n = 0 ; n < def->nfss ; n++)

12
src/domain_conf.h
View File

@ -111,9 +111,19 @@ struct _virDomainDiskDef {
int cachemode;
unsigned int readonly : 1;
unsigned int shared : 1;
int slotnum; /* pci slot number for unattach */
struct {
unsigned domain;
unsigned bus;
unsigned slot;
} pci_addr;
};
static inline int
virDiskHasValidPciAddr(virDomainDiskDefPtr def)
{
return def->pci_addr.domain || def->pci_addr.domain || def->pci_addr.slot;
}
/* Two types of disk backends */
enum virDomainFSType {

36
src/qemu_driver.c
View File

@ -4390,6 +4390,8 @@ try_command:
return -1;
}
VIR_FREE(cmd);
DEBUG ("%s: pci_add reply: %s", vm->def->name, reply);
/* If the command succeeds qemu prints:
* OK bus 0, slot XXX...
@ -4399,22 +4401,25 @@ try_command:
if ((s = strstr(reply, "OK ")) &&
(s = strstr(s, "slot "))) {
char *dummy = s;
unsigned slot;
s += strlen("slot ");
if (virStrToLong_i ((const char*)s, &dummy, 10, &dev->data.disk->slotnum) == -1)
if (virStrToLong_ui((const char*)s, &dummy, 10, &slot) == -1)
VIR_WARN("%s", _("Unable to parse slot number\n"));
/* XXX not neccessarily always going to end up in domain 0 / bus 0 :-( */
/* XXX this slotnum is not persistant across restarts :-( */
dev->data.disk->pci_addr.domain = 0;
dev->data.disk->pci_addr.bus = 0;
dev->data.disk->pci_addr.slot = slot;
} else if (!tryOldSyntax && strstr(reply, "invalid char in expression")) {
VIR_FREE(reply);
VIR_FREE(cmd);
tryOldSyntax = 1;
goto try_command;
} else {
qemudReportError (conn, dom, NULL, VIR_ERR_OPERATION_FAILED,
_("adding %s disk failed: %s"), type, reply);
VIR_FREE(reply);
VIR_FREE(cmd);
return -1;
}
@ -4423,7 +4428,7 @@ try_command:
virDomainDiskQSort);
VIR_FREE(reply);
VIR_FREE(cmd);
return 0;
}
@ -4660,21 +4665,24 @@ static int qemudDomainDetachPciDiskDevice(virConnectPtr conn,
goto cleanup;
}
if (detach->slotnum < 1) {
if (!virDiskHasValidPciAddr(detach)) {
qemudReportError(conn, NULL, NULL, VIR_ERR_OPERATION_FAILED,
_("disk %s cannot be detached - invalid slot number %d"),
detach->dst, detach->slotnum);
_("disk %s cannot be detached - no PCI address for device"),
detach->dst);
goto cleanup;
}
try_command:
if (tryOldSyntax) {
if (virAsprintf(&cmd, "pci_del 0 %d", detach->slotnum) < 0) {
if (virAsprintf(&cmd, "pci_del 0 %.2x", detach->pci_addr.slot) < 0) {
virReportOOMError(conn);
goto cleanup;
}
} else {
if (virAsprintf(&cmd, "pci_del pci_addr=0:0:%d", detach->slotnum) < 0) {
if (virAsprintf(&cmd, "pci_del pci_addr=%.4x:%.2x:%.2x",
detach->pci_addr.domain,
detach->pci_addr.bus,
detach->pci_addr.slot) < 0) {
virReportOOMError(conn);
goto cleanup;
}
@ -4698,8 +4706,12 @@ try_command:
if (strstr(reply, "invalid slot") ||
strstr(reply, "Invalid pci address")) {
qemudReportError (conn, NULL, NULL, VIR_ERR_OPERATION_FAILED,
_("failed to detach disk %s: invalid slot %d: %s"),
detach->dst, detach->slotnum, reply);
_("failed to detach disk %s: invalid PCI address %.4x:%.2x:%.2x: %s"),
detach->dst,
detach->pci_addr.domain,
detach->pci_addr.bus,
detach->pci_addr.slot,
reply);
goto cleanup;
}

1
src/vbox/vbox_tmpl.c
View File

@ -2712,7 +2712,6 @@ static virDomainPtr vboxDomainDefineXML(virConnectPtr conn, const char *xml) {
DEBUG("disk(%d) cachemode: %d", i, def->disks[i]->cachemode);
DEBUG("disk(%d) readonly: %s", i, def->disks[i]->readonly ? "True" : "False");
DEBUG("disk(%d) shared: %s", i, def->disks[i]->shared ? "True" : "False");
DEBUG("disk(%d) slotnum: %d", i, def->disks[i]->slotnum);
if (def->disks[i]->device == VIR_DOMAIN_DISK_DEVICE_CDROM) {
if (def->disks[i]->type == VIR_DOMAIN_DISK_TYPE_FILE) {