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qemu_capabilities: Introduce virQEMUCapsCacheLookupDefault

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virConnectGetDomainCapabilities needs to lookup QEMU capabilities
matching a specified binary, architecture, virt type, and machine type
while using default values when any of the parameters are not provided
by the user. Let's extract the lookup code into
virQEMUCapsCacheLookupDefault to make it reusable.

Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
This commit is contained in:
Jiri Denemark 2018-05-07 22:51:57 +02:00
parent d0ff5ce43b
commit da3bfc9ffc
3 changed files with 137 additions and 75 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

118
src/qemu/qemu_capabilities.c
View File

@ -4555,6 +4555,124 @@ virQEMUCapsCacheLookupByArch(virFileCachePtr cache,
}
/**
* virQEMUCapsCacheLookupDefault:
* @cache: QEMU capabilities cache
* @binary: optional path to QEMU binary
* @archStr: optional guest architecture
* @virttypeStr: optional virt type
* @machine: optional machine type
* @retArch: if non-NULL, guest architecture will be returned here
* @retVirttype: if non-NULL, domain virt type will be returned here
* @retMachine: if non-NULL, canonical machine type will be returned here
*
* Looks up the QEMU binary specified by @binary and @archStr, checks it can
* provide the required @virttypeStr and @machine and returns its capabilities.
* Sensible defaults are used for any argument which is NULL (the function can
* even be called with all NULL arguments).
*
* Returns QEMU capabilities matching the requirements, NULL on error.
*/
virQEMUCapsPtr
virQEMUCapsCacheLookupDefault(virFileCachePtr cache,
const char *binary,
const char *archStr,
const char *virttypeStr,
const char *machine,
virArch *retArch,
virDomainVirtType *retVirttype,
const char **retMachine)
{
int virttype = VIR_DOMAIN_VIRT_NONE;
int arch = virArchFromHost();
virDomainVirtType capsType;
virQEMUCapsPtr qemuCaps = NULL;
virQEMUCapsPtr ret = NULL;
if (virttypeStr &&
(virttype = virDomainVirtTypeFromString(virttypeStr)) < 0) {
virReportError(VIR_ERR_INVALID_ARG,
_("unknown virttype: %s"), virttypeStr);
goto cleanup;
}
if (archStr &&
(arch = virArchFromString(archStr)) == VIR_ARCH_NONE) {
virReportError(VIR_ERR_INVALID_ARG,
_("unknown architecture: %s"), archStr);
goto cleanup;
}
if (binary) {
virArch arch_from_caps;
if (!(qemuCaps = virQEMUCapsCacheLookup(cache, binary)))
goto cleanup;
arch_from_caps = virQEMUCapsGetArch(qemuCaps);
if (arch_from_caps != arch &&
!((ARCH_IS_X86(arch) && ARCH_IS_X86(arch_from_caps)) ||
(ARCH_IS_PPC(arch) && ARCH_IS_PPC(arch_from_caps)) ||
(ARCH_IS_ARM(arch) && ARCH_IS_ARM(arch_from_caps)) ||
(ARCH_IS_S390(arch) && ARCH_IS_S390(arch_from_caps)))) {
virReportError(VIR_ERR_INVALID_ARG,
_("architecture from emulator '%s' doesn't "
"match given architecture '%s'"),
virArchToString(arch_from_caps),
virArchToString(arch));
goto cleanup;
}
} else {
if (!(qemuCaps = virQEMUCapsCacheLookupByArch(cache, arch)))
goto cleanup;
binary = virQEMUCapsGetBinary(qemuCaps);
}
if (machine) {
/* Turn @machine into canonical name */
machine = virQEMUCapsGetCanonicalMachine(qemuCaps, machine);
if (!virQEMUCapsIsMachineSupported(qemuCaps, machine)) {
virReportError(VIR_ERR_INVALID_ARG,
_("the machine '%s' is not supported by emulator '%s'"),
machine, binary);
goto cleanup;
}
} else {
machine = virQEMUCapsGetDefaultMachine(qemuCaps);
}
if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_KVM))
capsType = VIR_DOMAIN_VIRT_KVM;
else
capsType = VIR_DOMAIN_VIRT_QEMU;
if (virttype == VIR_DOMAIN_VIRT_NONE)
virttype = capsType;
if (virttype == VIR_DOMAIN_VIRT_KVM && capsType == VIR_DOMAIN_VIRT_QEMU) {
virReportError(VIR_ERR_INVALID_ARG,
_("KVM is not supported by '%s' on this host"),
binary);
goto cleanup;
}
if (retArch)
*retArch = arch;
if (retVirttype)
*retVirttype = virttype;
if (retMachine)
*retMachine = machine;
VIR_STEAL_PTR(ret, qemuCaps);
cleanup:
virObjectUnref(qemuCaps);
return ret;
}
bool
virQEMUCapsSupportsVmport(virQEMUCapsPtr qemuCaps,
const virDomainDef *def)

8
src/qemu/qemu_capabilities.h
View File

@ -563,6 +563,14 @@ virQEMUCapsPtr virQEMUCapsCacheLookupCopy(virFileCachePtr cache,
const char *machineType);
virQEMUCapsPtr virQEMUCapsCacheLookupByArch(virFileCachePtr cache,
virArch arch);
virQEMUCapsPtr virQEMUCapsCacheLookupDefault(virFileCachePtr cache,
const char *binary,
const char *archStr,
const char *virttypeStr,
const char *machine,
virArch *retArch,
virDomainVirtType *retVirttype,
const char **retMachine);
virCapsPtr virQEMUCapsInit(virFileCachePtr cache);

86
src/qemu/qemu_driver.c
View File

@ -19393,10 +19393,9 @@ qemuConnectGetDomainCapabilities(virConnectPtr conn,
char *ret = NULL;
virQEMUDriverPtr driver = conn->privateData;
virQEMUCapsPtr qemuCaps = NULL;
int virttype = VIR_DOMAIN_VIRT_NONE;
virDomainVirtType capsType;
virArch arch;
virDomainVirtType virttype;
virDomainCapsPtr domCaps = NULL;
int arch = virArchFromHost(); /* virArch */
virQEMUDriverConfigPtr cfg = NULL;
virCapsPtr caps = NULL;
@ -19410,80 +19409,17 @@ qemuConnectGetDomainCapabilities(virConnectPtr conn,
if (!(caps = virQEMUDriverGetCapabilities(driver, false)))
goto cleanup;
if (virttype_str &&
(virttype = virDomainVirtTypeFromString(virttype_str)) < 0) {
virReportError(VIR_ERR_INVALID_ARG,
_("unknown virttype: %s"),
virttype_str);
qemuCaps = virQEMUCapsCacheLookupDefault(driver->qemuCapsCache,
emulatorbin,
arch_str,
virttype_str,
machine,
&arch, &virttype, &machine);
if (!qemuCaps)
goto cleanup;
}
if (arch_str && (arch = virArchFromString(arch_str)) == VIR_ARCH_NONE) {
virReportError(VIR_ERR_INVALID_ARG,
_("unknown architecture: %s"),
arch_str);
goto cleanup;
}
if (emulatorbin) {
virArch arch_from_caps;
if (!(qemuCaps = virQEMUCapsCacheLookup(driver->qemuCapsCache,
emulatorbin)))
goto cleanup;
arch_from_caps = virQEMUCapsGetArch(qemuCaps);
if (arch_from_caps != arch &&
!((ARCH_IS_X86(arch) && ARCH_IS_X86(arch_from_caps)) ||
(ARCH_IS_PPC(arch) && ARCH_IS_PPC(arch_from_caps)) ||
(ARCH_IS_ARM(arch) && ARCH_IS_ARM(arch_from_caps)) ||
(ARCH_IS_S390(arch) && ARCH_IS_S390(arch_from_caps)))) {
virReportError(VIR_ERR_INVALID_ARG,
_("architecture from emulator '%s' doesn't "
"match given architecture '%s'"),
virArchToString(arch_from_caps),
virArchToString(arch));
goto cleanup;
}
} else {
if (!(qemuCaps = virQEMUCapsCacheLookupByArch(driver->qemuCapsCache,
arch)))
goto cleanup;
emulatorbin = virQEMUCapsGetBinary(qemuCaps);
}
if (machine) {
/* Turn @machine into canonical name */
machine = virQEMUCapsGetCanonicalMachine(qemuCaps, machine);
if (!virQEMUCapsIsMachineSupported(qemuCaps, machine)) {
virReportError(VIR_ERR_INVALID_ARG,
_("the machine '%s' is not supported by emulator '%s'"),
machine, emulatorbin);
goto cleanup;
}
} else {
machine = virQEMUCapsGetDefaultMachine(qemuCaps);
}
if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_KVM))
capsType = VIR_DOMAIN_VIRT_KVM;
else
capsType = VIR_DOMAIN_VIRT_QEMU;
if (virttype == VIR_DOMAIN_VIRT_NONE)
virttype = capsType;
if (virttype == VIR_DOMAIN_VIRT_KVM && capsType == VIR_DOMAIN_VIRT_QEMU) {
virReportError(VIR_ERR_INVALID_ARG,
_("KVM is not supported by '%s' on this host"),
emulatorbin);
goto cleanup;
}
if (!(domCaps = virDomainCapsNew(emulatorbin, machine, arch, virttype)))
if (!(domCaps = virDomainCapsNew(virQEMUCapsGetBinary(qemuCaps), machine,
arch, virttype)))
goto cleanup;
if (virQEMUCapsFillDomainCaps(caps, domCaps, qemuCaps,