SDL problem with 2.6.21/kvm-17 on x86_64?

SDL problem with 2.6.21/kvm-17 on x86_64?

[Joshua Hoblitt]

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Hello,

I'm attempting to get kvm-17 to work on a "server" system that has a kernel
built without alsa support and libsdl is built without alsa or oss support.

I get this error when attempting to start qemu:
--
$ sudo /usr/local/kvm/bin/qemu-system-x86_64  . -hda vdisk.img -cdrom /data/ipp000.0/jhoblitt/openSUSE-10.2-GM-DVD-x86_64.iso -boot d -m 1024
Could not configure '/dev/rtc' to have a 1024 Hz timer. This is not a fatal
error, but for better emulation accuracy either use a 2.6 host Linux
kernel or type 'echo 1024 > /proc/sys/dev/rtc/max-user-freq' as root.
kvm_create_vm: Invalid argument
Could not create KVM context
$ lsmod | grep kvm
kvm_amd                19348  0 
kvm                    68040  1 kvm_amd
--

This system has 2 x Opeterson 2220s on a Tyan S2927.  I'm guess that this
failure is somehow related to sound as when I try to start qemu with -no-kvm...

--
 sudo /usr/local/kvm/bin/qemu-system-x86_64  . -hda vdisk.img -cdrom /data/ipp000.0/jhoblitt/openSUSE-10.2-GM-DVD-x86_64.iso -boot d -m 1024 -no-kvm
Could not configure '/dev/rtc' to have a 1024 Hz timer. This is not a fatal
error, but for better emulation accuracy either use a 2.6 host Linux kernel or
type 'echo 1024 > /proc/sys/dev/rtc/max-user-freq' as root.
Could not initialize SDL - exiting
--

So is the lack of sound hardware the problem here?  If so, will it be possible
at somepoint to run without it?

-J

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Re: SDL problem with 2.6.21/kvm-17 on x86_64?

[Avi Kivity]

Joshua Hoblitt wrote:
> Hello,
>
> I'm attempting to get kvm-17 to work on a "server" system that has a kernel
> built without alsa support and libsdl is built without alsa or oss support.
>
> I get this error when attempting to start qemu:
> --
> $ sudo /usr/local/kvm/bin/qemu-system-x86_64  . -hda vdisk.img -cdrom /data/ipp000.0/jhoblitt/openSUSE-10.2-GM-DVD-x86_64.iso -boot d -m 1024
> Could not configure '/dev/rtc' to have a 1024 Hz timer. This is not a fatal
> error, but for better emulation accuracy either use a 2.6 host Linux
> kernel or type 'echo 1024 > /proc/sys/dev/rtc/max-user-freq' as root.
> kvm_create_vm: Invalid argument
> Could not create KVM context
> $ lsmod | grep kvm
> kvm_amd                19348  0 
> kvm                    68040  1 kvm_amd
>
>   

Strange.  Can you provide an strace of the run?


> --
>  sudo /usr/local/kvm/bin/qemu-system-x86_64  . -hda vdisk.img -cdrom /data/ipp000.0/jhoblitt/openSUSE-10.2-GM-DVD-x86_64.iso -boot d -m 1024 -no-kvm
> Could not configure '/dev/rtc' to have a 1024 Hz timer. This is not a fatal
> error, but for better emulation accuracy either use a 2.6 host Linux kernel or
> type 'echo 1024 > /proc/sys/dev/rtc/max-user-freq' as root.
> Could not initialize SDL - exiting
> --
>
> So is the lack of sound hardware the problem here?  If so, will it be possible
> at somepoint to run without it?
>
>   

In addition to the problem above, qemu couldn't access your X server. 
Try adding '-vnc :1' to the command line.


-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.


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[PATCH] Handle #SS(0), caused by address size override in vm86 mode

[Kamble, Nitin A]

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Hi Avi,

I was playing with KVM while booting SuSE Linux 10.1 on it. And I found
it was bailing out with #SS fault. I root caused it to the address size
override opcode (0x67) from a mov instruction from the boot loader.
  The attached patch handles the #SS(0) fault with emulation, letting
guest can proceed further.

Thanks & Regards,
Nitin 
Open Source Technology Center, Intel Corporation.
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[-- Type: text/x-patch, Size: 921 bytes --]

commit e7ae040a34ae99ac4eb08701b1a54a7e4315238a
Author: Nitin A Kamble <nitin.a.kamble@intel.com>
Date:   Wed May 16 21:05:58 2007 -0700

     Instruction with address size override prefix opcode 0x67
     Cause the #SS fault with 0 error code in VM86 mode.
     <Signed-Off-By: Nitin A Kamble <nitin.a.kamble@intel.com>

diff --git a/drivers/kvm/vmx.c b/drivers/kvm/vmx.c
index b1430e1..7d7edb7 100644
--- a/drivers/kvm/vmx.c
+++ b/drivers/kvm/vmx.c
@@ -1487,7 +1487,9 @@ static int handle_rmode_exception(struct kvm_vcpu *vcpu,
 	if (!vcpu->rmode.active)
 		return 0;
 
-	if (vec == GP_VECTOR && err_code == 0)
+    /* Instruction with address size override prefix opcode 0x67
+       Cause the #SS fault with 0 error code in VM86 mode.  */
+	if (((vec == GP_VECTOR) || (vec == SS_VECTOR)) && err_code == 0)
 		if (emulate_instruction(vcpu, NULL, 0, 0) == EMULATE_DONE)
 			return 1;
 	return 0;

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Re: [PATCH] Handle #SS(0), caused by address size override in vm86 mode

[Avi Kivity]

Kamble, Nitin A wrote:
> Hi Avi,
>
> I was playing with KVM while booting SuSE Linux 10.1 on it. And I 
> found it was bailing out with #SS fault. I root caused it to the 
> address size override opcode (0x67) from a mov instruction from the 
> boot loader.
>   The attached patch handles the #SS(0) fault with emulation, letting 
> guest can proceed further.

Applied, thanks.  Please use Linux style comment next time (
/*
 * blah blah
 */
)

> commit e7ae040a34ae99ac4eb08701b1a54a7e4315238a
> Author: Nitin A Kamble <nitin.a.kamble-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
> Date:   Wed May 16 21:05:58 2007 -0700
>
>      Instruction with address size override prefix opcode 0x67
>      Cause the #SS fault with 0 error code in VM86 mode.
>      <Signed-Off-By: Nitin A Kamble <nitin.a.kamble-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
>
> diff --git a/drivers/kvm/vmx.c b/drivers/kvm/vmx.c
> index b1430e1..7d7edb7 100644
> --- a/drivers/kvm/vmx.c
> +++ b/drivers/kvm/vmx.c
> @@ -1487,7 +1487,9 @@ static int handle_rmode_exception(struct kvm_vcpu *vcpu,
>  	if (!vcpu->rmode.active)
>  		return 0;
>  
> -	if (vec == GP_VECTOR && err_code == 0)
> +    /* Instruction with address size override prefix opcode 0x67
> +       Cause the #SS fault with 0 error code in VM86 mode.  */
> +	if (((vec == GP_VECTOR) || (vec == SS_VECTOR)) && err_code == 0)
>  		if (emulate_instruction(vcpu, NULL, 0, 0) == EMULATE_DONE)
>  			return 1;
>  	return 0;
>   


-- 
error compiling committee.c: too many arguments to function


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