Hi All, I am interested in Linux kernel development. I have subscribed for newbies mail for a while and this is my first mail to the group. My intention and interest is to work on network( if possible mm) side of kernel. First of all thanks for all the kernel developers and the guys here for contribution to Linux community. Here is my doubt. 1) I downloaded the linux source code and created the config using make defconfig and created image using make ( I did not do make install as I want test it with kvm) I have windows 7 system and I have installed ubuntu using vmware. I have installed KVM on ubuntu and I am trying to boot the kernal image with KVM. But I am not sure what is the problem. I am stuck in this screen. Is something I am missing here? The approach using kvm to put some logs and to see module initialization is wrong?. The command I am using kvm -kernel ./arch/x86/boot/bzImage -append root=/root/ I see the below message and then the qemu prompt does not boot and stops by displaying below traceback. Could not access KVM kernel module: No such file or directory failed to initialize KVM: No such file or directory QEMU 5.1654731 Stack: 5.1654731 c18ea844 claea9a0 00000000 fffffffa d?861efc 00008001 d?8611 a35f91 5.1654731 cl8ddba8 d?861efc d7861efc fffffffa 00000000 d7b6e000 cl8dd6 ff3dc0 5.1654731 d7b6e000 6e6b6e75 2d6e??61 636f 6c62 2c30286b c1002930 d78611 13c248 5.1654731 Call Trace: 5.1654731 l<c1a35f91>1 mount_block_root+Ox158/0x1de 5.1654731 l<c1002930>1 ? do_general_protection+0x40/0x170 5.1654731 l<c113c248>1 ? SyS_mknod+0x28/0x30 5.1654731 l<cla3610a>1 mount_root+Oxf3/Oxfb 5.1654731 l<c1a36235>1 prepare_namespace+0x123/0x167 5.1654731 l<c112cf30>l ? SyS_access+0x20/0x30 5.1654731 l<cla35cf7>1 kernel_init_freeable+Ox1b5/0x1c2 5.1654731 l<c1a35545>1 ? do_early_param+0x74/0x74 5.1654731 l<c174caab>1 kernel_init+Oxb/Oxe0 5.1654731 l<c175a041>1 ret_from_kernel_thread+0x21/0x30 5.1654731 l<c174caa0>1 ? rest_init+0x60/0x60 5.1654731 Code: 00 00 00 00 31 ff 83 3d 8c a9 ae cl 00 74 05 e8 Oe dO 9 c? 44 24 04 a0 a9 ae cl c7 04 24 44 a8 Be cl e8 b6 05 00 00 fb 3116 <35>1 15 83 75 f0 01 8b 45 f0 ff 15 80 a9 ae cl 01 c6 8d be 5.1654731 EIP: l<c174f2e9>1 panic+0x165/0x197 SS:ESP 0068:d7861eb8 5.1654731 --I end trace a4Obaf277b417d8d 1-- Thanks Harish
On Wed, 2014-10-15 at 15:01 +0530, harisha ja wrote:
I have windows 7 system and I have installed ubuntu using vmware. I have installed KVM on ubuntu and I am trying to boot the kernal image with KVM.
Does vmware emulate the KVM related chip functionality (ie, "VT" for an x86 Intel CPU or "AMD-V (SVM)" for x86 AMD CPU)?
But I am not sure what is the problem. I am stuck in this screen. Is something I am missing here?
The approach using kvm to put some logs and to see module initialization is wrong?.
The command I am using kvm -kernel ./arch/x86/boot/bzImage -append root=/root/
You call this command in your vmware session of a virtual Ubuntu system, don't you?
I see the below message and then the qemu prompt does not boot and stops by displaying below traceback.
Could not access KVM kernel module: No such file or directory failed to initialize KVM: No such file or directory
Is this the only message, or only the part you thought was interesting?
QEMU 5.1654731 Stack: 5.1654731 c18ea844 claea9a0 00000000 fffffffa d?861efc 00008001 d?8611 a35f91 5.1654731 cl8ddba8 d?861efc d7861efc fffffffa 00000000 d7b6e000 cl8dd6 ff3dc0 5.1654731 d7b6e000 6e6b6e75 2d6e??61 636f 6c62 2c30286b c1002930 d78611 13c248 5.1654731 Call Trace: 5.1654731 l<c1a35f91>1 mount_block_root+Ox158/0x1de 5.1654731 l<c1002930>1 ? do_general_protection+0x40/0x170 5.1654731 l<c113c248>1 ? SyS_mknod+0x28/0x30 5.1654731 l<cla3610a>1 mount_root+Oxf3/Oxfb 5.1654731 l<c1a36235>1 prepare_namespace+0x123/0x167 5.1654731 l<c112cf30>l ? SyS_access+0x20/0x30 5.1654731 l<cla35cf7>1 kernel_init_freeable+Ox1b5/0x1c2 5.1654731 l<c1a35545>1 ? do_early_param+0x74/0x74 5.1654731 l<c174caab>1 kernel_init+Oxb/Oxe0 5.1654731 l<c175a041>1 ret_from_kernel_thread+0x21/0x30 5.1654731 l<c174caa0>1 ? rest_init+0x60/0x60 5.1654731 Code: 00 00 00 00 31 ff 83 3d 8c a9 ae cl 00 74 05 e8 Oe dO 9 c? 44 24 04 a0 a9 ae cl c7 04 24 44 a8 Be cl e8 b6 05 00 00 fb 3116 <35>1 15 83 75 f0 01 8b 45 f0 ff 15 80 a9 ae cl 01 c6 8d be 5.1654731 EIP: l<c174f2e9>1 panic+0x165/0x197 SS:ESP 0068:d7861eb8 5.1654731 --I end trace a4Obaf277b417d8d 1--
This looks like the kind of backtrace one gets when the kernel can't find its root device. I see something like it every now and then, and it mostly means that I made a mistake when I configured a machine. It also means, I think, that the KVM problem you quoted wasn't fatal for this virtual boot. Setting the root device might be tricky to get right when booting a virtualized system. At least, I remember fiddling with it. But your "root" kernel parameter should be something like: root=/dev/sda1 It rather depends on how your Ubuntu system is setup (ie, what the layout is of the image that vmware uses to boot Ubuntu, apparently). Paul Bolle
On Wed, 2014-10-15 at 12:17 +0200, Paul Bolle wrote:
Setting the root device might be tricky to get right when booting a virtualized system. At least, I remember fiddling with it. But your "root" kernel parameter should be something like: root=/dev/sda1
It rather depends on how your Ubuntu system is setup (ie, what the layout is of the image that vmware uses to boot Ubuntu, apparently).
This can't be right! Assuming you really are running qemu (kvm still is a qemu variant, isn't it?) inside a vmware session: it depends on the layout of the guest image that qemu uses. And the kvm command line you quoted mentions no image for qemu to use. Are you actually trying virtualization inside a virtualized system? Paul Bolle
Hi Paul, Thanks for your reply. Please see inline. On Wed, Oct 15, 2014 at 3:47 PM, Paul Bolle <pebolle@tiscali.nl> wrote:
On Wed, 2014-10-15 at 15:01 +0530, harisha ja wrote:
I have windows 7 system and I have installed ubuntu using vmware. I have installed KVM on ubuntu and I am trying to boot the kernal image with KVM.
Does vmware emulate the KVM related chip functionality (ie, "VT" for an x86 Intel CPU or "AMD-V (SVM)" for x86 AMD CPU)?
I am not sure about this. How I can check it?
But I am not sure what is the problem. I am stuck in this screen. Is something I am missing here?
The approach using kvm to put some logs and to see module initialization is wrong?.
The command I am using kvm -kernel ./arch/x86/boot/bzImage -append root=/root/
You call this command in your vmware session of a virtual Ubuntu system, don't you?
Yes. Windows7 (Host) -> Ubuntu 12 ( Installed on top of windows7 using
vmware ) -> KVM ( I am trying to load the kernal image built using This KVM)
I see the below message and then the qemu prompt does not boot and stops by displaying below traceback.
Could not access KVM kernel module: No such file or directory failed to initialize KVM: No such file or directory
Is this the only message, or only the part you thought was interesting?
I am getting many messages like booting from ROM and Decompressing linux kernel and then it prints lot of other messages but not sure how I can redirecting those from kvm terminal to txt file. I am not being able to attach the screen-shots because of email size restrictions.
QEMU 5.1654731 Stack: 5.1654731 c18ea844 claea9a0 00000000 fffffffa d?861efc 00008001 d?8611 a35f91 5.1654731 cl8ddba8 d?861efc d7861efc fffffffa 00000000 d7b6e000 cl8dd6 ff3dc0 5.1654731 d7b6e000 6e6b6e75 2d6e??61 636f 6c62 2c30286b c1002930 d78611 13c248 5.1654731 Call Trace: 5.1654731 l<c1a35f91>1 mount_block_root+Ox158/0x1de 5.1654731 l<c1002930>1 ? do_general_protection+0x40/0x170 5.1654731 l<c113c248>1 ? SyS_mknod+0x28/0x30 5.1654731 l<cla3610a>1 mount_root+Oxf3/Oxfb 5.1654731 l<c1a36235>1 prepare_namespace+0x123/0x167 5.1654731 l<c112cf30>l ? SyS_access+0x20/0x30 5.1654731 l<cla35cf7>1 kernel_init_freeable+Ox1b5/0x1c2 5.1654731 l<c1a35545>1 ? do_early_param+0x74/0x74 5.1654731 l<c174caab>1 kernel_init+Oxb/Oxe0 5.1654731 l<c175a041>1 ret_from_kernel_thread+0x21/0x30 5.1654731 l<c174caa0>1 ? rest_init+0x60/0x60 5.1654731 Code: 00 00 00 00 31 ff 83 3d 8c a9 ae cl 00 74 05 e8 Oe dO 9 c? 44 24 04 a0 a9 ae cl c7 04 24 44 a8 Be cl e8 b6 05 00 00 fb 3116 <35>1 15 83 75 f0 01 8b 45 f0 ff 15 80 a9 ae cl 01 c6 8d be 5.1654731 EIP: l<c174f2e9>1 panic+0x165/0x197 SS:ESP 0068:d7861eb8 5.1654731 --I end trace a4Obaf277b417d8d 1--
This looks like the kind of backtrace one gets when the kernel can't find its root device. I see something like it every now and then, and it mostly means that I made a mistake when I configured a machine. It also means, I think, that the KVM problem you quoted wasn't fatal for this virtual boot.
Setting the root device might be tricky to get right when booting a virtualized system. At least, I remember fiddling with it. But your "root" kernel parameter should be something like: root=/dev/sda1
It rather depends on how your Ubuntu system is setup (ie, what the layout is of the image that vmware uses to boot Ubuntu, apparently).
I changed this and it tried to boot the kernal but after that kvm is not giving any console. I don't want to do make install and and reboot complete ubuntu to check my print log because I feel it takes more time.
Paul Bolle
[Could you please, one of these days, look into the ways you can make gmail send plain text? Note that the Linux kernel mailing list simply rejects html messages.] On Wed, 2014-10-15 at 23:20 +0530, harisha ja wrote: On Wed, Oct 15, 2014 at 3:47 PM, Paul Bolle <pebolle@tiscali.nl> wrote:
Does vmware emulate the KVM related chip functionality (ie, "VT" for an x86 Intel CPU or "AMD-V (SVM)" for x86 AMD CPU)?
I am not sure about this. How I can check it?
With the command you quoted yourself in another message in this thread (but slightly edited by me): egrep -o '(vmx|svm)' /proc/cpuinfo And by Googling on "vmware" and "kvm" or "nested kvm". I'm not sure what the current state is of kvm run inside virtualization tools, sorry.
Windows7 (Host) -> Ubuntu 12 ( Installed on top of windows7 using vmware ) -> KVM ( I am trying to load the kernal image built using This KVM)
I see. (Maybe it might be easier to run qemu directly, with the -kernel option, using (a copy of) your Ubuntu 12 vmware image. Ask around on qemu related forums, lists, etc.)
I am getting many messages like booting from ROM and Decompressing linux kernel and then it prints lot of other messages but not sure how I can redirecting those from kvm terminal to txt file. I am not being able to attach the screen-shots because of email size restrictions.
Again, ask around on qemu related forums or lists, etc.
I changed this and it tried to boot the kernal but after that kvm is not giving any console.
There's probably a qemu command line option involved. Ask around... (see above).
I don't want to do make install and and reboot complete ubuntu to check my print log because I feel it takes more time.
You might need to tweak the qemu image you use inside your vmware image. The vmware image should not be the issue (see another message from me in this thread). Hope this helps, Paul Bolle
Hello, On Wednesday 15 October 2014 03:01 PM, harisha ja wrote:
Hi All,
I am interested in Linux kernel development. I have subscribed for newbies mail for a while and this is my first mail to the group. My intention and interest is to work on network( if possible mm) side of kernel. First of all thanks for all the kernel developers and the guys here for contribution to Linux community.
Here is my doubt.
1) I downloaded the linux source code and created the config using make defconfig and created image using make ( I did not do make install as I want test it with kvm)
I have windows 7 system and I have installed ubuntu using vmware. I have installed KVM on ubuntu and I am trying to boot the kernal image with KVM. But I am not sure what is the problem. I am stuck in this screen. Is something I am missing here?
The approach using kvm to put some logs and to see module initialization is wrong?.
The command I am using kvm -kernel ./arch/x86/boot/bzImage -append root=/root/
Along with the kernel, you must also specify the file system image. A simple invoking of the command could be something like this : $ kvm -hda file_system.img -kernel bzImage -append "root=/dev/sda1"
I see the below message and then the qemu prompt does not boot and stops by displaying below traceback.
|Could not access KVM kernel module: No such file or directory failed to initialize KVM: No such file or directory|
That's fine. QEMU uses something called as tcg accelerator to get the job done.
QEMU 5.1654731 Stack: 5.1654731 c18ea844 claea9a0 00000000 fffffffa d?861efc 00008001 d?8611 a35f91 5.1654731 cl8ddba8 d?861efc d7861efc fffffffa 00000000 d7b6e000 cl8dd6 ff3dc0 5.1654731 d7b6e000 6e6b6e75 2d6e??61 636f 6c62 2c30286b c1002930 d78611 13c248 5.1654731 Call Trace: 5.1654731 l<c1a35f91>1 mount_block_root+Ox158/0x1de 5.1654731 l<c1002930>1 ? do_general_protection+0x40/0x170 5.1654731 l<c113c248>1 ? SyS_mknod+0x28/0x30 5.1654731 l<cla3610a>1 mount_root+Oxf3/Oxfb 5.1654731 l<c1a36235>1 prepare_namespace+0x123/0x167 5.1654731 l<c112cf30>l ? SyS_access+0x20/0x30 5.1654731 l<cla35cf7>1 kernel_init_freeable+Ox1b5/0x1c2 5.1654731 l<c1a35545>1 ? do_early_param+0x74/0x74 5.1654731 l<c174caab>1 kernel_init+Oxb/Oxe0 5.1654731 l<c175a041>1 ret_from_kernel_thread+0x21/0x30 5.1654731 l<c174caa0>1 ? rest_init+0x60/0x60 5.1654731 Code: 00 00 00 00 31 ff 83 3d 8c a9 ae cl 00 74 05 e8 Oe dO 9 c? 44 24 04 a0 a9 ae cl c7 04 24 44 a8 Be cl e8 b6 05 00 00 fb 3116 <35>1 15 83 75 f0 01 8b 45 f0 ff 15 80 a9 ae cl 01 c6 8d be 5.1654731 EIP: l<c174f2e9>1 panic+0x165/0x197 SS:ESP 0068:d7861eb8 5.1654731 --I end trace a4Obaf277b417d8d 1--
This is probably because of the file system issue that I've mentioned previously.
Thanks Harish
_______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Raghavendra ------------------------------------------------------------------------------------------------------------------------------- [ C-DAC is on Social-Media too. Kindly follow us at: Facebook: https://www.facebook.com/CDACINDIA & Twitter: @cdacindia ] This e-mail is for the sole use of the intended recipient(s) and may contain confidential and privileged information. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies and the original message. Any unauthorized review, use, disclosure, dissemination, forwarding, printing or copying of this email is strictly prohibited and appropriate legal action will be taken. -------------------------------------------------------------------------------------------------------------------------------
Hi Raghavendra, Thanks for your response. Yes that was an issue and I corrected it. But I see kvm is trying to boot the kernel and I still see those tracebacks and it does not do anything after that. It is not giving back the console. Some commands I executed linux/linux_ws$ sudo modprobe kvm-intel FATAL: Error inserting kvm_intel (/lib/modules/3.11.0-15-generic/kernel/arch/x86/kvm/kvm-intel.ko): Operation not supported rama@ubuntu:~/linux/linux_ws$ rama@ubuntu:~/linux/linux_ws$ egrep '^flags.*(vmx|svm)' /proc/cpuinfo rama@ubuntu:~/linux/linux_ws$ The modified command qemu-system-x86_64 -kernel ./arch/x86/boot/bzImage -append "root=/dev/sda" This is my printf which I am expecting to see using dmsg after kernel bootup. Am I missing something here? rama@ubuntu:~/linux/linux_ws$ git diff diff --git a/drivers/net/ethernet/intel/e1000/e1000_main.c b/drivers/net/ethernet/intel/e1000/e1000_main.c index cbc330b..3063991 100644 --- a/drivers/net/ethernet/intel/e1000/e1000_main.c +++ b/drivers/net/ethernet/intel/e1000/e1000_main.c @@ -937,7 +937,7 @@ static int e1000_probe(struct pci_dev *pdev, const struct pci_device_id *ent) struct net_device *netdev; struct e1000_adapter *adapter; struct e1000_hw *hw; - + static int cards_found = 0; static int global_quad_port_a = 0; /* global ksp3 port a indication */ int i, err, pci_using_dac; @@ -945,7 +945,8 @@ static int e1000_probe(struct pci_dev *pdev, const struct pci_device_id *ent) u16 tmp = 0; u16 eeprom_apme_mask = E1000_EEPROM_APME; int bars, need_ioport; - + + printk(KERN_DEBUG "I can modify the Linux kernel!\n"); /* do not allocate ioport bars when not needed */ need_ioport = e1000_is_need_ioport(pdev); if (need_ioport) { Thanks and Regards, Harisha On Wed, Oct 15, 2014 at 3:53 PM, Raghavendra <arrao@cdac.in> wrote:
Hello, On Wednesday 15 October 2014 03:01 PM, harisha ja wrote:
Hi All,
I am interested in Linux kernel development. I have subscribed for newbies mail for a while and this is my first mail to the group. My intention and interest is to work on network( if possible mm) side of kernel. First of all thanks for all the kernel developers and the guys here for contribution to Linux community.
Here is my doubt.
1) I downloaded the linux source code and created the config using make defconfig and created image using make ( I did not do make install as I want test it with kvm)
I have windows 7 system and I have installed ubuntu using vmware. I have installed KVM on ubuntu and I am trying to boot the kernal image with KVM. But I am not sure what is the problem. I am stuck in this screen. Is something I am missing here?
The approach using kvm to put some logs and to see module initialization is wrong?.
The command I am using kvm -kernel ./arch/x86/boot/bzImage -append root=/root/
Along with the kernel, you must also specify the file system image. A simple invoking of the command could be something like this : $ kvm -hda file_system.img -kernel bzImage -append "root=/dev/sda1"
I see the below message and then the qemu prompt does not boot and stops by displaying below traceback.
Could not access KVM kernel module: No such file or directory failed to initialize KVM: No such file or directory
That's fine. QEMU uses something called as tcg accelerator to get the job done.
QEMU 5.1654731 Stack: 5.1654731 c18ea844 claea9a0 00000000 fffffffa d?861efc 00008001 d?8611 a35f91 5.1654731 cl8ddba8 d?861efc d7861efc fffffffa 00000000 d7b6e000 cl8dd6 ff3dc0 5.1654731 d7b6e000 6e6b6e75 2d6e??61 636f 6c62 2c30286b c1002930 d78611 13c248 5.1654731 Call Trace: 5.1654731 l<c1a35f91>1 mount_block_root+Ox158/0x1de 5.1654731 l<c1002930>1 ? do_general_protection+0x40/0x170 5.1654731 l<c113c248>1 ? SyS_mknod+0x28/0x30 5.1654731 l<cla3610a>1 mount_root+Oxf3/Oxfb 5.1654731 l<c1a36235>1 prepare_namespace+0x123/0x167 5.1654731 l<c112cf30>l ? SyS_access+0x20/0x30 5.1654731 l<cla35cf7>1 kernel_init_freeable+Ox1b5/0x1c2 5.1654731 l<c1a35545>1 ? do_early_param+0x74/0x74 5.1654731 l<c174caab>1 kernel_init+Oxb/Oxe0 5.1654731 l<c175a041>1 ret_from_kernel_thread+0x21/0x30 5.1654731 l<c174caa0>1 ? rest_init+0x60/0x60 5.1654731 Code: 00 00 00 00 31 ff 83 3d 8c a9 ae cl 00 74 05 e8 Oe dO 9 c? 44 24 04 a0 a9 ae cl c7 04 24 44 a8 Be cl e8 b6 05 00 00 fb 3116 <35>1 15 83 75 f0 01 8b 45 f0 ff 15 80 a9 ae cl 01 c6 8d be 5.1654731 EIP: l<c174f2e9>1 panic+0x165/0x197 SS:ESP 0068:d7861eb8 5.1654731 --I end trace a4Obaf277b417d8d 1--
This is probably because of the file system issue that I've mentioned previously.
Thanks Harish
_______________________________________________ Kernelnewbies mailing listKernelnewbies@kernelnewbies.orghttp://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Raghavendra
-------------------------------------------------------------------------------------------------------------------------------
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On Wed, 2014-10-15 at 23:27 +0530, harisha ja wrote:
rama@ubuntu:~/linux/linux_ws$ git diff diff --git a/drivers/net/ethernet/intel/e1000/e1000_main.c b/drivers/net/ethernet/intel/e1000/e1000_main.c index cbc330b..3063991 100644 --- a/drivers/net/ethernet/intel/e1000/e1000_main.c +++ b/drivers/net/ethernet/intel/e1000/e1000_main.c @@ -945,7 +945,8 @@ static int e1000_probe(struct pci_dev *pdev, const [...] struct pci_device_id *ent) u16 tmp = 0; u16 eeprom_apme_mask = E1000_EEPROM_APME; int bars, need_ioport; - + + printk(KERN_DEBUG "I can modify the Linux kernel!\n"); /* do not allocate ioport bars when not needed */ need_ioport = e1000_is_need_ioport(pdev); if (need_ioport) {
Two things come to mind: - I don't think printk() at KERN_DEBUG level makes it to the console (by default at least). Try KERN_ERR; - do you actually run kvm (so, basically, qemu) with an emulated e1000 device? Hope this helps, Paul Bolle
On 15/10/2014 11:27 PM, harisha ja wrote:
Hi Raghavendra,
Thanks for your response.
Yes that was an issue and I corrected it. But I see kvm is trying to boot the kernel and I still see those tracebacks and it does not do anything after that. It is not giving back the console.
That is because you are trying to boot a system without providing the root file system. You could get a simple non-GUI based file systems if you just search for it, else you could build your own and then try launching QEMU.
Some commands I executed
linux/linux_ws$ sudo modprobe kvm-intel FATAL: Error inserting kvm_intel (/lib/modules/3.11.0-15-generic/kernel/arch/x86/kvm/kvm-intel.ko): Operation not supported rama@ubuntu:~/linux/linux_ws$
First of all, the underlying hardware, which in your case is VmWare box, has to support that!
rama@ubuntu:~/linux/linux_ws$ egrep '^flags.*(vmx|svm)' /proc/cpuinfo rama@ubuntu:~/linux/linux_ws$
The modified command
qemu-system-x86_64 -kernel ./arch/x86/boot/bzImage -append "root=/dev/sda"
This is my printf which I am expecting to see using dmsg after kernel bootup. Am I missing something here?
rama@ubuntu:~/linux/linux_ws$ git diff diff --git a/drivers/net/ethernet/intel/e1000/e1000_main.c b/drivers/net/ethernet/intel/e1000/e1000_main.c index cbc330b..3063991 100644 --- a/drivers/net/ethernet/intel/e1000/e1000_main.c +++ b/drivers/net/ethernet/intel/e1000/e1000_main.c @@ -937,7 +937,7 @@ static int e1000_probe(struct pci_dev *pdev, const struct pci_device_id *ent) struct net_device *netdev; struct e1000_adapter *adapter; struct e1000_hw *hw; - + static int cards_found = 0; static int global_quad_port_a = 0; /* global ksp3 port a indication */ int i, err, pci_using_dac; @@ -945,7 +945,8 @@ static int e1000_probe(struct pci_dev *pdev, const struct pci_device_id *ent) u16 tmp = 0; u16 eeprom_apme_mask = E1000_EEPROM_APME; int bars, need_ioport; - + + printk(KERN_DEBUG "I can modify the Linux kernel!\n"); /* do not allocate ioport bars when not needed */ need_ioport = e1000_is_need_ioport(pdev); if (need_ioport) {
Ok, first of all, what Paul suggested is absolutely right. You can't get through the kernel log for a KERN_DEBUG(except for changing some make options and all). Try using dev_info(). The next thing I see is that, you are printing in the driver's probe function, which would not be called unless a matching hardware is found. While launching kvm itself, you have you provide the hardware as well. So, your complete setup should be something like this. 1) Download a file system image(or make your own). Lets call this "rootfs.img" 2) Compile the driver, e1000 as a part of linux(not as a module). 3) While launching QEMU, provide an option to "emulate" the e1000 device as well. 4) Launch qemu as : $ qemu-system-x86 -hda rootfs.img -kernel bzImage -append "root=/dev/sda1" -net nic,model=e1000
Thanks and Regards, Harisha
Hope this helps. Raghavendra
On Wed, Oct 15, 2014 at 3:53 PM, Raghavendra <arrao@cdac.in <mailto:arrao@cdac.in>> wrote:
Hello, On Wednesday 15 October 2014 03:01 PM, harisha ja wrote:
Hi All,
I am interested in Linux kernel development. I have subscribed for newbies mail for a while and this is my first mail to the group. My intention and interest is to work on network( if possible mm) side of kernel. First of all thanks for all the kernel developers and the guys here for contribution to Linux community.
Here is my doubt.
1) I downloaded the linux source code and created the config using make defconfig and created image using make ( I did not do make install as I want test it with kvm)
I have windows 7 system and I have installed ubuntu using vmware. I have installed KVM on ubuntu and I am trying to boot the kernal image with KVM. But I am not sure what is the problem. I am stuck in this screen. Is something I am missing here?
The approach using kvm to put some logs and to see module initialization is wrong?.
The command I am using kvm -kernel ./arch/x86/boot/bzImage -append root=/root/
Along with the kernel, you must also specify the file system image. A simple invoking of the command could be something like this : $ kvm -hda file_system.img -kernel bzImage -append "root=/dev/sda1"
I see the below message and then the qemu prompt does not boot and stops by displaying below traceback.
|Could not access KVM kernel module: No such file or directory failed to initialize KVM: No such file or directory|
That's fine. QEMU uses something called as tcg accelerator to get the job done.
QEMU 5.1654731 Stack: 5.1654731 c18ea844 claea9a0 00000000 fffffffa d?861efc 00008001 d?8611 a35f91 5.1654731 cl8ddba8 d?861efc d7861efc fffffffa 00000000 d7b6e000 cl8dd6 ff3dc0 5.1654731 d7b6e000 6e6b6e75 2d6e??61 636f 6c62 2c30286b c1002930 d78611 13c248 5.1654731 Call Trace: 5.1654731 l<c1a35f91>1 mount_block_root+Ox158/0x1de 5.1654731 l<c1002930>1 ? do_general_protection+0x40/0x170 5.1654731 l<c113c248>1 ? SyS_mknod+0x28/0x30 5.1654731 l<cla3610a>1 mount_root+Oxf3/Oxfb 5.1654731 l<c1a36235>1 prepare_namespace+0x123/0x167 5.1654731 l<c112cf30>l ? SyS_access+0x20/0x30 5.1654731 l<cla35cf7>1 kernel_init_freeable+Ox1b5/0x1c2 5.1654731 l<c1a35545>1 ? do_early_param+0x74/0x74 5.1654731 l<c174caab>1 kernel_init+Oxb/Oxe0 5.1654731 l<c175a041>1 ret_from_kernel_thread+0x21/0x30 5.1654731 l<c174caa0>1 ? rest_init+0x60/0x60 5.1654731 Code: 00 00 00 00 31 ff 83 3d 8c a9 ae cl 00 74 05 e8 Oe dO 9 c? 44 24 04 a0 a9 ae cl c7 04 24 44 a8 Be cl e8 b6 05 00 00 fb 3116 <35>1 15 83 75 f0 01 8b 45 f0 ff 15 80 a9 ae cl 01 c6 8d be 5.1654731 EIP: l<c174f2e9>1 panic+0x165/0x197 SS:ESP 0068:d7861eb8 5.1654731 --I end trace a4Obaf277b417d8d 1--
This is probably because of the file system issue that I've mentioned previously.
Thanks Harish
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Raghavendra
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Hi Raghavendra and Paul, Thanks for your reply. True I should read more about KVM things and need to change the my setup so that I can stop using winows-ubuntu-kvm hierarchy. Sure I will try out these steps and come back. Regards, Harish On Thu, Oct 16, 2014 at 12:43 AM, Raghavendra <arrao@cdac.in> wrote:
On 15/10/2014 11:27 PM, harisha ja wrote:
Hi Raghavendra,
Thanks for your response.
Yes that was an issue and I corrected it. But I see kvm is trying to boot the kernel and I still see those tracebacks and it does not do anything after that. It is not giving back the console.
That is because you are trying to boot a system without providing the root file system. You could get a simple non-GUI based file systems if you just search for it, else you could build your own and then try launching QEMU.
Some commands I executed
linux/linux_ws$ sudo modprobe kvm-intel FATAL: Error inserting kvm_intel (/lib/modules/3.11.0-15-generic/kernel/arch/x86/kvm/kvm-intel.ko): Operation not supported rama@ubuntu:~/linux/linux_ws$
First of all, the underlying hardware, which in your case is VmWare box, has to support that!
rama@ubuntu:~/linux/linux_ws$ egrep '^flags.*(vmx|svm)' /proc/cpuinfo rama@ubuntu:~/linux/linux_ws$
The modified command
qemu-system-x86_64 -kernel ./arch/x86/boot/bzImage -append "root=/dev/sda"
This is my printf which I am expecting to see using dmsg after kernel bootup. Am I missing something here?
rama@ubuntu:~/linux/linux_ws$ git diff diff --git a/drivers/net/ethernet/intel/e1000/e1000_main.c b/drivers/net/ethernet/intel/e1000/e1000_main.c index cbc330b..3063991 100644 --- a/drivers/net/ethernet/intel/e1000/e1000_main.c +++ b/drivers/net/ethernet/intel/e1000/e1000_main.c @@ -937,7 +937,7 @@ static int e1000_probe(struct pci_dev *pdev, const struct pci_device_id *ent) struct net_device *netdev; struct e1000_adapter *adapter; struct e1000_hw *hw; - + static int cards_found = 0; static int global_quad_port_a = 0; /* global ksp3 port a indication */ int i, err, pci_using_dac; @@ -945,7 +945,8 @@ static int e1000_probe(struct pci_dev *pdev, const struct pci_device_id *ent) u16 tmp = 0; u16 eeprom_apme_mask = E1000_EEPROM_APME; int bars, need_ioport; - + + printk(KERN_DEBUG "I can modify the Linux kernel!\n"); /* do not allocate ioport bars when not needed */ need_ioport = e1000_is_need_ioport(pdev); if (need_ioport) {
Ok, first of all, what Paul suggested is absolutely right. You can't get through the kernel log for a KERN_DEBUG(except for changing some make options and all). Try using dev_info().
The next thing I see is that, you are printing in the driver's probe function, which would not be called unless a matching hardware is found. While launching kvm itself, you have you provide the hardware as well.
So, your complete setup should be something like this. 1) Download a file system image(or make your own). Lets call this "rootfs.img" 2) Compile the driver, e1000 as a part of linux(not as a module). 3) While launching QEMU, provide an option to "emulate" the e1000 device as well. 4) Launch qemu as :
$ qemu-system-x86 -hda rootfs.img -kernel bzImage -append "root=/dev/sda1" -net nic,model=e1000
Thanks and Regards, Harisha
Hope this helps.
Raghavendra
On Wed, Oct 15, 2014 at 3:53 PM, Raghavendra <arrao@cdac.in> wrote:
Hello, On Wednesday 15 October 2014 03:01 PM, harisha ja wrote:
Hi All,
I am interested in Linux kernel development. I have subscribed for newbies mail for a while and this is my first mail to the group. My intention and interest is to work on network( if possible mm) side of kernel. First of all thanks for all the kernel developers and the guys here for contribution to Linux community.
Here is my doubt.
1) I downloaded the linux source code and created the config using make defconfig and created image using make ( I did not do make install as I want test it with kvm)
I have windows 7 system and I have installed ubuntu using vmware. I have installed KVM on ubuntu and I am trying to boot the kernal image with KVM. But I am not sure what is the problem. I am stuck in this screen. Is something I am missing here?
The approach using kvm to put some logs and to see module initialization is wrong?.
The command I am using kvm -kernel ./arch/x86/boot/bzImage -append root=/root/
Along with the kernel, you must also specify the file system image. A simple invoking of the command could be something like this : $ kvm -hda file_system.img -kernel bzImage -append "root=/dev/sda1"
I see the below message and then the qemu prompt does not boot and stops by displaying below traceback.
Could not access KVM kernel module: No such file or directory failed to initialize KVM: No such file or directory
That's fine. QEMU uses something called as tcg accelerator to get the job done.
QEMU 5.1654731 Stack: 5.1654731 c18ea844 claea9a0 00000000 fffffffa d?861efc 00008001 d?8611 a35f91 5.1654731 cl8ddba8 d?861efc d7861efc fffffffa 00000000 d7b6e000 cl8dd6 ff3dc0 5.1654731 d7b6e000 6e6b6e75 2d6e??61 636f 6c62 2c30286b c1002930 d78611 13c248 5.1654731 Call Trace: 5.1654731 l<c1a35f91>1 mount_block_root+Ox158/0x1de 5.1654731 l<c1002930>1 ? do_general_protection+0x40/0x170 5.1654731 l<c113c248>1 ? SyS_mknod+0x28/0x30 5.1654731 l<cla3610a>1 mount_root+Oxf3/Oxfb 5.1654731 l<c1a36235>1 prepare_namespace+0x123/0x167 5.1654731 l<c112cf30>l ? SyS_access+0x20/0x30 5.1654731 l<cla35cf7>1 kernel_init_freeable+Ox1b5/0x1c2 5.1654731 l<c1a35545>1 ? do_early_param+0x74/0x74 5.1654731 l<c174caab>1 kernel_init+Oxb/Oxe0 5.1654731 l<c175a041>1 ret_from_kernel_thread+0x21/0x30 5.1654731 l<c174caa0>1 ? rest_init+0x60/0x60 5.1654731 Code: 00 00 00 00 31 ff 83 3d 8c a9 ae cl 00 74 05 e8 Oe dO 9 c? 44 24 04 a0 a9 ae cl c7 04 24 44 a8 Be cl e8 b6 05 00 00 fb 3116 <35>1 15 83 75 f0 01 8b 45 f0 ff 15 80 a9 ae cl 01 c6 8d be 5.1654731 EIP: l<c174f2e9>1 panic+0x165/0x197 SS:ESP 0068:d7861eb8 5.1654731 --I end trace a4Obaf277b417d8d 1--
This is probably because of the file system issue that I've mentioned previously.
Thanks Harish
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Raghavendra
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harisha ja <harisha.ja <at> gmail.com> writes:
I have windows 7 system and I have installed ubuntu using vmware. I have installed KVM on ubuntu and I am trying to boot the kernal image with KVM. But I am not sure what is the problem. I am stuck in this screen. Is something I am missing here?
May I ask WHY are you trying to virtualization inside a virtualized system (as Paul Bolle stated)? I ask because IMHO it would be much easier to just boot your new kernel on your already virtualized machine or simply install ubuntu on your pc and avoid the whole virtualization "inception" thing. Regards BGS
participants (4)
-
Bruno Guedes Souto -
harisha ja -
Paul Bolle -
Raghavendra