10:11 a.m.
I am wondering about the extent to which "old" qemu-0.11.1 and kqemu-1.4.0 are
supported by virt-manager.
I see I can specify --virt-type=kqemu on virt-install and it remembers domain
type='kqemu', and does things such as refusing to start the vm if the kqemu
kernel mod not loaded, but it seems it does not tack on the
-enable-kqemu -kernel-kqemu
options on to the qemu command line. There is really not much point in trying to start
a qemu-based vm with neither hardware kvm nor kqemu ...
I can work around it with an override script to intercept the qemu command, but does
anyone think virt-manager ought to do this for me?
John Lumby
_________________________________________________________________
10:21 a.m.
On Wed, Jul 14, 2010 at 11:11:48AM -0400, John Lumby wrote:
I am wondering about the extent to which "old" qemu-0.11.1
and kqemu-1.4.0 are supported by virt-manager.
I see I can specify --virt-type=kqemu on virt-install and
it remembers domain type='kqemu', and does things such as
refusing to start the vm if the kqemu kernel mod not loaded,
but it seems it does not tack on the
-enable-kqemu -kernel-kqemu
options on to the qemu command line. There is really not
much point in trying to start a qemu-based vm with neither
hardware kvm nor kqemu ...
It looks for presence of /dev/kqemu and a -no-kqemu arg in
QEMU's help. I had no idea that arg had been changed to
be -enable-kqemu. Patches welcome to support that new
arg. See qemudBuildCommandLine() & qemudComputeCmdFlags()
methods in src/qemu/qemu_conf.c
Daniel
--
|: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/ :|
|: http://libvirt.org -o- http://virt-manager.org -o- http://deltacloud.org :|
|: http://autobuild.org -o- http://search.cpan.org/~danberr/ :|
|: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :|
8:49 p.m.
Date: Wed, 14 Jul 2010 16:21:47 +0100
From:
berrange(a)redhat.com
To: johnlumby(a)hotmail.com
CC:
libvir-list(a)redhat.com
Subject: Re: [libvirt] (how much) support
for kqemu domain
On Wed, Jul 14, 2010 at 11:11:48AM
-0400, John Lumby wrote:
>
> I am wondering about
the extent to which "old" qemu-0.11.1
> and kqemu-1.4.0 are
supported by virt-manager.
>
>
It looks for presence of /dev/kqemu and a -no-kqemu arg in
QEMU's help. I had no idea that arg had been changed to
be
-enable-kqemu. Patches welcome to support that new
arg. See
qemudBuildCommandLine() & qemudComputeCmdFlags()
methods in
src/qemu/qemu_conf.c
Daniel
Thanks Daniel for the pointer to the source code . Interesting
"interface".
Here's my patch - works for me but tested only on my own qemu-1.11.1
--- src/qemu/qemu_conf.h.orig 2010-04-23 11:52:47.000000000 -0400
+++ src/qemu/qemu_conf.h 2010-07-15 15:27:44.000000000 -0400
@@ -88,6 +88,13 @@ enum qemud_cmd_flags {
QEMUD_CMD_FLAG_NO_HPET = (1LL << 33), /* -no-hpet flag is supported */
QEMUD_CMD_FLAG_NO_KVM_PIT = (1LL << 34), /* -no-kvm-pit-reinjection
supported */
QEMUD_CMD_FLAG_TDF = (1LL << 35), /* -tdf flag (user-mode pit
catchup) */
+
+ /* features added in qemu-0.11.x jel */
+ QEMUD_CMD_FLAG_KQEMU_EXPLICIT = (1LL << 36) /* KQEMU is available but must be
explicitly requested
+ ** using options -enable-kqemu
-kernel-kqemu
+ ** note we either specify both or
neither
+ ** since qemu domain is always
system mode (I think?) jel
+ */
};
/* Main driver state */
--- src/qemu/qemu_conf.c.orig 2010-04-30 08:46:09.000000000 -0400
+++ src/qemu/qemu_conf.c 2010-07-15 21:15:12.000000000 -0400
@@ -1130,6 +1130,14 @@ static unsigned long long qemudComputeCm
if (strstr(help, "-no-kqemu"))
flags |= QEMUD_CMD_FLAG_KQEMU;
+ /* here we check for qemu version of *exactly* 0.11.x,
+ ** which requires different options to select kqemu jel */
+ if ( ( version >= 11000 ) && ( version <= 11999 )
+ && ( ( strstr(help, "-enable-kqemu") )
+ || ( strstr(help, "-kernel-kqemu") )
+ )
+ )
+ flags |= ( QEMUD_CMD_FLAG_KQEMU | QEMUD_CMD_FLAG_KQEMU_EXPLICIT );
if (strstr(help, "-no-kvm"))
flags |= QEMUD_CMD_FLAG_KVM;
if (strstr(help, "-enable-kvm"))
@@ -3431,7 +3439,10 @@ int qemudBuildCommandLine(virConnectPtr
char memory[50];
char boot[VIR_DOMAIN_BOOT_LAST];
struct utsname ut;
- int disableKQEMU = 0;
+ int disableKQEMU = 0; /* 0 means don't enable or disable
+ ** +1 means do explicitly disable
+ ** -1 means do explicitly enable (double-negative)
+ */
int disableKVM = 0;
int enableKVM = 0;
int qargc = 0, qarga = 0;
@@ -3484,10 +3495,24 @@ int qemudBuildCommandLine(virConnectPtr
/* Need to explicitly disable KQEMU if
* 1. Guest domain is 'qemu'
* 2. The qemu binary has the -no-kqemu flag
+ *
+ * and need to explicitly enable KQEMU if
+ * 1. Guest domain is 'kqemu'
+ * 2. The qemu binary has the -enable-kqemu flag
*/
- if ((qemuCmdFlags & QEMUD_CMD_FLAG_KQEMU) &&
- def->virtType == VIR_DOMAIN_VIRT_QEMU)
- disableKQEMU = 1;
+
+ if (qemuCmdFlags & QEMUD_CMD_FLAG_KQEMU) {
+ /* we need to decide whether to explictly enable,
+ ** explicitly disable, or neither (default) */
+ if (def->virtType == VIR_DOMAIN_VIRT_QEMU) {
+ disableKQEMU = 1;
+ } else
+ if ( ( def->virtType == VIR_DOMAIN_VIRT_KQEMU )
+ && ( qemuCmdFlags & QEMUD_CMD_FLAG_KQEMU_EXPLICIT )
+ ) {
+ disableKQEMU = -1; /* explicitly enable */
+ }
+ }
/* Need to explicitly disable KVM if
* 1. Guest domain is 'qemu'
@@ -3617,8 +3642,12 @@ int qemudBuildCommandLine(virConnectPtr
VIR_FREE(cpu);
}
- if (disableKQEMU)
+ if (disableKQEMU == 1)
ADD_ARG_LIT("-no-kqemu");
+ else if (disableKQEMU == -1) {
+ ADD_ARG_LIT("-enable-kqemu");
+ ADD_ARG_LIT("-kernel-kqemu");
+ }
if (disableKVM)
ADD_ARG_LIT("-no-kvm");
if (enableKVM)
John Lumby
_________________________________________________________________
Game on: Challenge friends to great games on Messenger
http://go.microsoft.com/?linkid=9734387
11:58 a.m.
New subject: [libvirt] (how much) support for kqemu domain
Date: Wed, 14 Jul 2010 16:21:47 +0100
From:
berrange(a)redhat.com
To: johnlumby(a)hotmail.com
CC:
libvir-list(a)redhat.com
Subject: Re: [libvirt] (how much) support
for kqemu domain
On Wed, Jul 14, 2010 at 11:11:48AM
-0400, John Lumby wrote:
>
> I am wondering about
the extent to which "old" qemu-0.11.1
> and kqemu-1.4.0 are
supported by virt-manager.
>
>
It looks for presence of /dev/kqemu and a -no-kqemu arg in
QEMU's help. I had no idea that arg had been changed to
be
-enable-kqemu. Patches welcome to support that new
arg. See
qemudBuildCommandLine() & qemudComputeCmdFlags()
methods in
src/qemu/qemu_conf.c
Daniel
Thanks Daniel for the pointer to the source code . Interesting
"interface".
Here's my patch - works for me but tested only on my own qemu-1.11.1
--- src/qemu/qemu_conf.h.orig 2010-04-23 11:52:47.000000000 -0400
+++ src/qemu/qemu_conf.h 2010-07-15 15:27:44.000000000 -0400
@@ -88,6 +88,13 @@ enum qemud_cmd_flags {
QEMUD_CMD_FLAG_NO_HPET = (1LL << 33), /* -no-hpet flag is supported */
QEMUD_CMD_FLAG_NO_KVM_PIT = (1LL << 34), /* -no-kvm-pit-reinjection
supported */
QEMUD_CMD_FLAG_TDF = (1LL << 35), /* -tdf flag (user-mode pit
catchup) */
+
+ /* features added in qemu-0.11.x jel */
+ QEMUD_CMD_FLAG_KQEMU_EXPLICIT = (1LL << 36) /* KQEMU is available but must be
explicitly requested
+ ** using options -enable-kqemu
-kernel-kqemu
+ ** note we either specify both or
neither
+ ** since qemu domain is always
system mode (I think?) jel
+ */
};
/* Main driver state */
--- src/qemu/qemu_conf.c.orig 2010-04-30 08:46:09.000000000 -0400
+++ src/qemu/qemu_conf.c 2010-07-15 21:15:12.000000000 -0400
@@ -1130,6 +1130,14 @@ static unsigned long long qemudComputeCm
if (strstr(help, "-no-kqemu"))
flags |= QEMUD_CMD_FLAG_KQEMU;
+ /* here we check for qemu version of *exactly* 0.11.x,
+ ** which requires different options to select kqemu jel */
+ if ( ( version >= 11000 ) && ( version <= 11999 )
+ && ( ( strstr(help, "-enable-kqemu") )
+ || ( strstr(help, "-kernel-kqemu") )
+ )
+ )
+ flags |= ( QEMUD_CMD_FLAG_KQEMU | QEMUD_CMD_FLAG_KQEMU_EXPLICIT );
if (strstr(help, "-no-kvm"))
flags |= QEMUD_CMD_FLAG_KVM;
if (strstr(help, "-enable-kvm"))
@@ -3431,7 +3439,10 @@ int qemudBuildCommandLine(virConnectPtr
char memory[50];
char boot[VIR_DOMAIN_BOOT_LAST];
struct utsname ut;
- int disableKQEMU = 0;
+ int disableKQEMU = 0; /* 0 means don't enable or disable
+ ** +1 means do explicitly disable
+ ** -1 means do explicitly enable (double-negative)
+ */
int disableKVM = 0;
int enableKVM = 0;
int qargc = 0, qarga = 0;
@@ -3484,10 +3495,24 @@ int qemudBuildCommandLine(virConnectPtr
/* Need to explicitly disable KQEMU if
* 1. Guest domain is 'qemu'
* 2. The qemu binary has the -no-kqemu flag
+ *
+ * and need to explicitly enable KQEMU if
+ * 1. Guest domain is 'kqemu'
+ * 2. The qemu binary has the -enable-kqemu flag
*/
- if ((qemuCmdFlags & QEMUD_CMD_FLAG_KQEMU) &&
- def->virtType == VIR_DOMAIN_VIRT_QEMU)
- disableKQEMU = 1;
+
+ if (qemuCmdFlags & QEMUD_CMD_FLAG_KQEMU) {
+ /* we need to decide whether to explictly enable,
+ ** explicitly disable, or neither (default) */
+ if (def->virtType == VIR_DOMAIN_VIRT_QEMU) {
+ disableKQEMU = 1;
+ } else
+ if ( ( def->virtType == VIR_DOMAIN_VIRT_KQEMU )
+ && ( qemuCmdFlags & QEMUD_CMD_FLAG_KQEMU_EXPLICIT )
+ ) {
+ disableKQEMU = -1; /* explicitly enable */
+ }
+ }
/* Need to explicitly disable KVM if
* 1. Guest domain is 'qemu'
@@ -3617,8 +3642,12 @@ int qemudBuildCommandLine(virConnectPtr
VIR_FREE(cpu);
}
- if (disableKQEMU)
+ if (disableKQEMU == 1)
ADD_ARG_LIT("-no-kqemu");
+ else if (disableKQEMU == -1) {
+ ADD_ARG_LIT("-enable-kqemu");
+ ADD_ARG_LIT("-kernel-kqemu");
+ }
if (disableKVM)
ADD_ARG_LIT("-no-kvm");
if (enableKVM)
John Lumby
_________________________________________________________________
Game on: Challenge friends to great games on Messenger
http://go.microsoft.com/?linkid=9734387
12:49 p.m.
[digging through old mail]
On 07/17/2010 10:58 AM, John Lumby wrote:
>> I am wondering about
the extent to which "old" qemu-0.11.1
>> and kqemu-1.4.0 are
supported by virt-manager.
>>
>>
>
> It looks for presence of /dev/kqemu and a -no-kqemu arg in
>
QEMU's help. I had no idea that arg had been changed to
> be
-enable-kqemu. Patches welcome to support that new
> arg. See
qemudBuildCommandLine() & qemudComputeCmdFlags()
> methods in
src/qemu/qemu_conf.c
>
> Daniel
>
Thanks Daniel for the pointer to the source code . Interesting "interface".
Here's my patch - works for me but tested only on my own qemu-1.11.1
I never saw a reply to this. Is this a patch that should be revived and
rebased onto the latest git?
--- src/qemu/qemu_conf.h.orig 2010-04-23 11:52:47.000000000 -0400
+++ src/qemu/qemu_conf.h 2010-07-15 15:27:44.000000000 -0400
@@ -88,6 +88,13 @@ enum qemud_cmd_flags {
QEMUD_CMD_FLAG_NO_HPET = (1LL << 33), /* -no-hpet flag is supported */
QEMUD_CMD_FLAG_NO_KVM_PIT = (1LL << 34), /* -no-kvm-pit-reinjection
supported */
QEMUD_CMD_FLAG_TDF = (1LL << 35), /* -tdf flag (user-mode pit
catchup) */
+
+ /* features added in qemu-0.11.x jel */
+ QEMUD_CMD_FLAG_KQEMU_EXPLICIT = (1LL << 36) /* KQEMU is available but must be
explicitly requested
+ ** using options -enable-kqemu
-kernel-kqemu
+ ** note we either specify both or
neither
+ ** since qemu domain is always
system mode (I think?) jel
+ */
};
/* Main driver state */
--- src/qemu/qemu_conf.c.orig 2010-04-30 08:46:09.000000000 -0400
+++ src/qemu/qemu_conf.c 2010-07-15 21:15:12.000000000 -0400
@@ -1130,6 +1130,14 @@ static unsigned long long qemudComputeCm
if (strstr(help, "-no-kqemu"))
flags |= QEMUD_CMD_FLAG_KQEMU;
+ /* here we check for qemu version of *exactly* 0.11.x,
+ ** which requires different options to select kqemu jel */
+ if ( ( version >= 11000 ) && ( version <= 11999 )
+ && ( ( strstr(help, "-enable-kqemu") )
+ || ( strstr(help, "-kernel-kqemu") )
+ )
+ )
+ flags |= ( QEMUD_CMD_FLAG_KQEMU | QEMUD_CMD_FLAG_KQEMU_EXPLICIT );
if (strstr(help, "-no-kvm"))
flags |= QEMUD_CMD_FLAG_KVM;
if (strstr(help, "-enable-kvm"))
@@ -3431,7 +3439,10 @@ int qemudBuildCommandLine(virConnectPtr
char memory[50];
char boot[VIR_DOMAIN_BOOT_LAST];
struct utsname ut;
- int disableKQEMU = 0;
+ int disableKQEMU = 0; /* 0 means don't enable or disable
+ ** +1 means do explicitly disable
+ ** -1 means do explicitly enable (double-negative)
+ */
int disableKVM = 0;
int enableKVM = 0;
int qargc = 0, qarga = 0;
@@ -3484,10 +3495,24 @@ int qemudBuildCommandLine(virConnectPtr
/* Need to explicitly disable KQEMU if
* 1. Guest domain is 'qemu'
* 2. The qemu binary has the -no-kqemu flag
+ *
+ * and need to explicitly enable KQEMU if
+ * 1. Guest domain is 'kqemu'
+ * 2. The qemu binary has the -enable-kqemu flag
*/
- if ((qemuCmdFlags & QEMUD_CMD_FLAG_KQEMU) &&
- def->virtType == VIR_DOMAIN_VIRT_QEMU)
- disableKQEMU = 1;
+
+ if (qemuCmdFlags & QEMUD_CMD_FLAG_KQEMU) {
+ /* we need to decide whether to explictly enable,
+ ** explicitly disable, or neither (default) */
+ if (def->virtType == VIR_DOMAIN_VIRT_QEMU) {
+ disableKQEMU = 1;
+ } else
+ if ( ( def->virtType == VIR_DOMAIN_VIRT_KQEMU )
+ && ( qemuCmdFlags & QEMUD_CMD_FLAG_KQEMU_EXPLICIT )
+ ) {
+ disableKQEMU = -1; /* explicitly enable */
+ }
+ }
/* Need to explicitly disable KVM if
* 1. Guest domain is 'qemu'
@@ -3617,8 +3642,12 @@ int qemudBuildCommandLine(virConnectPtr
VIR_FREE(cpu);
}
- if (disableKQEMU)
+ if (disableKQEMU == 1)
ADD_ARG_LIT("-no-kqemu");
+ else if (disableKQEMU == -1) {
+ ADD_ARG_LIT("-enable-kqemu");
+ ADD_ARG_LIT("-kernel-kqemu");
+ }
if (disableKVM)
ADD_ARG_LIT("-no-kvm");
if (enableKVM)
--
Eric Blake eblake(a)redhat.com +1-801-349-2682
Libvirt virtualization library http://libvirt.org
3:19 p.m.
Hello Eric.
I am fairly sure I remember *someone* saying they had integrated a
modified version of the fix into libvirt but can't find any email saying
so now. Maybe Daniel? On a very quick look at 0.9.2 source,
it *appears* to have been implemented in qemu_command.c (but I didn't
verify running it).
Cheers, John Lumby
On 06/06/11 13:49, Eric Blake wrote:
[digging through old mail]
On 07/17/2010 10:58 AM, John Lumby wrote:
>>> I am wondering about
> the extent to which "old" qemu-0.11.1
>>> and kqemu-1.4.0 are
> supported by virt-manager.
>>>
>> It looks for presence of /dev/kqemu and a -no-kqemu arg in
>>
> QEMU's help. I had no idea that arg had been changed to
>> be
> -enable-kqemu. Patches welcome to support that new
>> arg. See
> qemudBuildCommandLine()& qemudComputeCmdFlags()
>> methods in
> src/qemu/qemu_conf.c
>> Daniel
>>
> Thanks Daniel for the pointer to the source code . Interesting
"interface".
>
> Here's my patch - works for me but tested only on my own qemu-1.11.1
I never saw a reply to this. Is this a patch that should be revived and
rebased onto the latest git?
> --- src/qemu/qemu_conf.h.orig 2010-04-23 11:52:47.000000000 -0400
> +++ src/qemu/qemu_conf.h 2010-07-15 15:27:44.000000000 -0400
> @@ -88,6 +88,13 @@ enum qemud_cmd_flags {
> QEMUD_CMD_FLAG_NO_HPET = (1LL<< 33), /* -no-hpet flag is supported
*/
> QEMUD_CMD_FLAG_NO_KVM_PIT = (1LL<< 34), /* -no-kvm-pit-reinjection
supported */
> QEMUD_CMD_FLAG_TDF = (1LL<< 35), /* -tdf flag (user-mode pit
catchup) */
> +
> + /* features added in qemu-0.11.x jel */
> + QEMUD_CMD_FLAG_KQEMU_EXPLICIT = (1LL<< 36) /* KQEMU is available but must
be explicitly requested
> + ** using options -enable-kqemu
-kernel-kqemu
> + ** note we either specify both or
neither
> + ** since qemu domain is always
system mode (I think?) jel
> + */
> };
>
> /* Main driver state */
> --- src/qemu/qemu_conf.c.orig 2010-04-30 08:46:09.000000000 -0400
> +++ src/qemu/qemu_conf.c 2010-07-15 21:15:12.000000000 -0400
> @@ -1130,6 +1130,14 @@ static unsigned long long qemudComputeCm
>
> if (strstr(help, "-no-kqemu"))
> flags |= QEMUD_CMD_FLAG_KQEMU;
> + /* here we check for qemu version of *exactly* 0.11.x,
> + ** which requires different options to select kqemu jel */
> + if ( ( version>= 11000 )&& ( version<= 11999 )
> +&& ( ( strstr(help, "-enable-kqemu") )
> + || ( strstr(help, "-kernel-kqemu") )
> + )
> + )
> + flags |= ( QEMUD_CMD_FLAG_KQEMU | QEMUD_CMD_FLAG_KQEMU_EXPLICIT );
> if (strstr(help, "-no-kvm"))
> flags |= QEMUD_CMD_FLAG_KVM;
> if (strstr(help, "-enable-kvm"))
> @@ -3431,7 +3439,10 @@ int qemudBuildCommandLine(virConnectPtr
> char memory[50];
> char boot[VIR_DOMAIN_BOOT_LAST];
> struct utsname ut;
> - int disableKQEMU = 0;
> + int disableKQEMU = 0; /* 0 means don't enable or disable
> + ** +1 means do explicitly disable
> + ** -1 means do explicitly enable
(double-negative)
> + */
> int disableKVM = 0;
> int enableKVM = 0;
> int qargc = 0, qarga = 0;
> @@ -3484,10 +3495,24 @@ int qemudBuildCommandLine(virConnectPtr
> /* Need to explicitly disable KQEMU if
> * 1. Guest domain is 'qemu'
> * 2. The qemu binary has the -no-kqemu flag
> + *
> + * and need to explicitly enable KQEMU if
> + * 1. Guest domain is 'kqemu'
> + * 2. The qemu binary has the -enable-kqemu flag
> */
> - if ((qemuCmdFlags& QEMUD_CMD_FLAG_KQEMU)&&
> - def->virtType == VIR_DOMAIN_VIRT_QEMU)
> - disableKQEMU = 1;
> +
> + if (qemuCmdFlags& QEMUD_CMD_FLAG_KQEMU) {
> + /* we need to decide whether to explictly enable,
> + ** explicitly disable, or neither (default) */
> + if (def->virtType == VIR_DOMAIN_VIRT_QEMU) {
> + disableKQEMU = 1;
> + } else
> + if ( ( def->virtType == VIR_DOMAIN_VIRT_KQEMU )
> +&& ( qemuCmdFlags& QEMUD_CMD_FLAG_KQEMU_EXPLICIT )
> + ) {
> + disableKQEMU = -1; /* explicitly enable */
> + }
> + }
>
> /* Need to explicitly disable KVM if
> * 1. Guest domain is 'qemu'
> @@ -3617,8 +3642,12 @@ int qemudBuildCommandLine(virConnectPtr
> VIR_FREE(cpu);
> }
>
> - if (disableKQEMU)
> + if (disableKQEMU == 1)
> ADD_ARG_LIT("-no-kqemu");
> + else if (disableKQEMU == -1) {
> + ADD_ARG_LIT("-enable-kqemu");
> + ADD_ARG_LIT("-kernel-kqemu");
> + }
> if (disableKVM)
> ADD_ARG_LIT("-no-kvm");
> if (enableKVM)
>
>
3:52 p.m.
On 06/06/2011 02:19 PM, John Lumby wrote:
Hello Eric.
I am fairly sure I remember *someone* saying they had integrated a
modified version of the fix into libvirt but can't find any email saying
so now. Maybe Daniel? On a very quick look at 0.9.2 source,
it *appears* to have been implemented in qemu_command.c (but I didn't
verify running it).
Thanks for your reply; I see it in the current sources as well. Looks
like commit 6e44ec7a was the winner.
Oh well, a bit more digging and I could have spared wasting time on
email. :)
>> + else if (disableKQEMU == -1) {
>> + ADD_ARG_LIT("-enable-kqemu");
>> + ADD_ARG_LIT("-kernel-kqemu");
The code uses a new variable enableKQEMU, as a nicer spelling than
overloading disableKQEMU into a tri-state with double-negative
interpretation.
--
Eric Blake eblake(a)redhat.com +1-801-349-2682
Libvirt virtualization library http://libvirt.org
4731
days inactive
5058
days old
6 comments
3 participants
participants (3)
-
Daniel P. Berrange -
Eric Blake -
John Lumby