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Detect newer qemu-kvm versions

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The KVM version string can be one of the following:

  - qemu-kvm-x.y.z in stable releases
  - kvm-XX for kvm versions up to kvm-85
  - qemu-kvm-devel-XX for kvm version kvm-86 and later

There are only a few of places where we need to detect
differences between KVM versions based on 0.9.1:

  1) VNET_HDR introduced in kvm-74

  2) -incoming tcp introduced in kvm-79

  3) -incoming exec introduced in kvm-80

  4) -incoming stdio in all earlier kvm versions

With qemu-kvm-0.10.x, we can now assume that (1) is available
if it's a KVM release, (2) and (3) is always available and
(4) is never available.

So, from now on we should only need to check the qemu version
number and the "is_kvm" flag for detecting feature availability.
We only need the KVM version number for older releases.

Signed-off-by: Mark McLoughlin <markmc@redhat.com>
This commit is contained in:
Mark McLoughlin 2009-06-11 14:15:49 +00:00
parent 56ecebf22d
commit 04cbe68797
2 changed files with 35 additions and 13 deletions
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4
ChangeLog
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@ -1,3 +1,7 @@
Thu Jun 11 15:17:12 GMT 2009 Mark McLoughlin <markmc@redhat.com>
* src/qemu_conf.c: detect newer qemu-kvm versions
Thu Jun 11 15:15:02 GMT 2009 Mark McLoughlin <markmc@redhat.com>
* src/qemu_conf.c: re-factor qemu version parsing.

44
src/qemu_conf.c
View File

@ -414,6 +414,7 @@ virCapsPtr qemudCapsInit(void) {
static unsigned int qemudComputeCmdFlags(const char *help,
unsigned int version,
unsigned int is_kvm,
unsigned int kvm_version)
{
unsigned int flags = 0;
@ -439,7 +440,8 @@ static unsigned int qemudComputeCmdFlags(const char *help,
flags |= QEMUD_CMD_FLAG_DRIVE_BOOT;
if (version >= 9000)
flags |= QEMUD_CMD_FLAG_VNC_COLON;
if (kvm_version >= 74)
if (is_kvm && (version >= 10000 || kvm_version >= 74))
flags |= QEMUD_CMD_FLAG_VNET_HDR;
/*
@ -452,15 +454,15 @@ static unsigned int qemudComputeCmdFlags(const char *help,
* was broken, because it blocked the monitor console
* while waiting for data, so pretend it doesn't exist
*/
if (kvm_version >= 79) {
if (version >= 10000) {
flags |= QEMUD_CMD_FLAG_MIGRATE_QEMU_TCP;
flags |= QEMUD_CMD_FLAG_MIGRATE_QEMU_EXEC;
} else if (kvm_version >= 79) {
flags |= QEMUD_CMD_FLAG_MIGRATE_QEMU_TCP;
if (kvm_version >= 80)
flags |= QEMUD_CMD_FLAG_MIGRATE_QEMU_EXEC;
} else if (kvm_version > 0) {
flags |= QEMUD_CMD_FLAG_MIGRATE_KVM_STDIO;
} else if (version >= 10000) {
flags |= QEMUD_CMD_FLAG_MIGRATE_QEMU_TCP;
flags |= QEMUD_CMD_FLAG_MIGRATE_QEMU_EXEC;
}
return flags;
@ -470,10 +472,19 @@ static unsigned int qemudComputeCmdFlags(const char *help,
* version number. The first bit is easy, just parse
* 'QEMU PC emulator version x.y.z'.
*
* With qemu-kvm, however, that is followed by a kvm-XX
* string in parenthesis.
* With qemu-kvm, however, that is followed by a string
* in parenthesis as follows:
* - qemu-kvm-x.y.z in stable releases
* - kvm-XX for kvm versions up to kvm-85
* - qemu-kvm-devel-XX for kvm version kvm-86 and later
*
* For qemu-kvm versions before 0.10.z, we need to detect
* the KVM version number for some features. With 0.10.z
* and later, we just need the QEMU version number and
* whether it is KVM QEMU or mainline QEMU.
*/
#define QEMU_VERSION_STR "QEMU PC emulator version"
#define QEMU_KVM_VER_PREFIX "(qemu-kvm-"
#define KVM_VER_PREFIX "(kvm-"
#define SKIP_BLANKS(p) do { while ((*(p) == ' ') || (*(p) == '\t')) (p)++; } while (0)
@ -481,12 +492,13 @@ static unsigned int qemudComputeCmdFlags(const char *help,
static int qemudParseHelpStr(const char *help,
unsigned int *flags,
unsigned int *version,
unsigned int *is_kvm,
unsigned int *kvm_version)
{
unsigned major, minor, micro;
const char *p = help;
*flags = *version = *kvm_version = 0;
*flags = *version = *is_kvm = *kvm_version = 0;
if (!STRPREFIX(p, QEMU_VERSION_STR))
goto fail;
@ -513,9 +525,13 @@ static int qemudParseHelpStr(const char *help,
SKIP_BLANKS(p);
if (STRPREFIX(p, KVM_VER_PREFIX)) {
if (STRPREFIX(p, QEMU_KVM_VER_PREFIX)) {
*is_kvm = 1;
p += strlen(QEMU_KVM_VER_PREFIX);
} else if (STRPREFIX(p, KVM_VER_PREFIX)) {
int ret;
*is_kvm = 1;
p += strlen(KVM_VER_PREFIX);
ret = virParseNumber(&p);
@ -527,12 +543,14 @@ static int qemudParseHelpStr(const char *help,
*version = (major * 1000 * 1000) + (minor * 1000) + micro;
*flags = qemudComputeCmdFlags(help, *version, *kvm_version);
*flags = qemudComputeCmdFlags(help, *version, *is_kvm, *kvm_version);
qemudDebug("Version %u.%u.%u, cooked version %u, flags %u",
major, minor, micro, *version, *flags);
if (*kvm_version)
qemudDebug("KVM version %u detected", *kvm_version);
qemudDebug("KVM version %d detected", *kvm_version);
else if (*is_kvm)
qemudDebug("qemu-kvm version %u.%u.%u detected", major, minor, micro);
return 0;
@ -558,7 +576,7 @@ int qemudExtractVersionInfo(const char *qemu,
pid_t child;
int newstdout = -1;
int ret = -1, status;
unsigned int version, kvm_version;
unsigned int version, is_kvm, kvm_version;
unsigned int flags = 0;
if (retflags)
@ -579,7 +597,7 @@ int qemudExtractVersionInfo(const char *qemu,
goto cleanup2;
}
if (qemudParseHelpStr(help, &version, &kvm_version, &flags) == -1)
if (qemudParseHelpStr(help, &version, &kvm_version, &is_kvm, &flags) == -1)
goto cleanup2;
if (retversion)