[ANNOUNCE] kvm-49 release

Avi Kivity

author

2007-11-01 23:12 UTC #0 lore raw

Today's big change is FlexPriority, which drastically improves Windows SMP and/or ACPI performance on newer Intel processors.

Changes from kvm-49:
- fix smp_call_function_mask() emulation on preemptible kernels
- move libkvm into own directory (Hollis Blanchard)
- fix save/restore/migrate for new memory slot management (Uri Lublin)
- compile fixes (Uri Lublin, me)
- fix recursive locking on mmap() (Anthony Liguori)
- remove some cr2 dependencies from x86 emulator
- further simplify x86 emulator
- more portability work (Carsten Otte, Hollis Blanchard)
- Intel FlexPriority support (Sheng Yang)
- fix dirty page tracking on aliased pages (Uri Lublin)

Notes:
If you use the modules bundled with kvm-50, you can use any version
of Linux from 2.6.9 upwards.
If you use the modules bundled with Linux 2.6.20, you need to use
kvm-12.
If you use the modules bundled with Linux 2.6.21, you need to use
kvm-17.
Modules from Linux 2.6.22 and up will work with any kvm version from
kvm-22. Some features may only be available in newer releases.
For best performance, use Linux 2.6.23-rc2 or later as the host.

http://kvm.qumranet.com

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Avi Kivity

author

2007-11-01 23:16 UTC #2 lore raw

Quoted 3 lines · Avi Kivity

Today's big change is FlexPriority, which drastically improves Windows SMP and/or ACPI performance on newer Intel processors.

Whoops, this is kvm-50, not as the subject line suggests.

Signature · 8 lines

Any sufficiently difficult bug is indistinguishable from a feature.


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Haydn Solomon

2007-11-02 01:10 UTC #3 lore raw

In reply to a message not in the archive

How can I tell that my cpu has flexpriority?

(Resending this as didn't cc list last time.)

Quoted 29 lines · Avi Kivity

Today's big change is FlexPriority, which drastically improves Windows SMP and/or ACPI performance on newer Intel processors.
Changes from kvm-49:
- fix smp_call_function_mask() emulation on preemptible kernels
- move libkvm into own directory (Hollis Blanchard)
- fix save/restore/migrate for new memory slot management (Uri Lublin)
- compile fixes (Uri Lublin, me)
- fix recursive locking on mmap() (Anthony Liguori)
- remove some cr2 dependencies from x86 emulator
- further simplify x86 emulator
- more portability work (Carsten Otte, Hollis Blanchard)
- Intel FlexPriority support (Sheng Yang)
- fix dirty page tracking on aliased pages (Uri Lublin)
Notes:
If you use the modules bundled with kvm-50, you can use any version
of Linux from 2.6.9 upwards.
If you use the modules bundled with Linux 2.6.20, you need to use
kvm-12.
If you use the modules bundled with Linux 2.6.21, you need to use
kvm-17.
Modules from Linux 2.6.22 and up will work with any kvm version from
kvm-22. Some features may only be available in newer releases.
For best performance, use Linux 2.6.23-rc2 or later as the host.
http://kvm.qumranet.com

Quoted 10 lines

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Sheng Yang

2007-11-02 01:30 UTC #5 lore raw

Quoted 3 lines · On Friday 02 November 2007 09:10:31 Haydn Solomon wrote:

How can I tell that my cpu has flexpriority?
(Resending this as didn't cc list last time.)

Try attached "printk" patch.

And generally, E6850, E6750, E6550, Core2 Duo processors starting from
G0 stepping should support this.

Quoted 40 lines · Avi Kivity

Quoted 38 lines
Today's big change is FlexPriority, which drastically improves Windows SMP and/or ACPI performance on newer Intel processors.
Changes from kvm-49:
- fix smp_call_function_mask() emulation on preemptible kernels
- move libkvm into own directory (Hollis Blanchard)
- fix save/restore/migrate for new memory slot management (Uri Lublin)
- compile fixes (Uri Lublin, me)
- fix recursive locking on mmap() (Anthony Liguori)
- remove some cr2 dependencies from x86 emulator
- further simplify x86 emulator
- more portability work (Carsten Otte, Hollis Blanchard)
- Intel FlexPriority support (Sheng Yang)
- fix dirty page tracking on aliased pages (Uri Lublin)
Notes:
If you use the modules bundled with kvm-50, you can use any version
of Linux from 2.6.9 upwards.
If you use the modules bundled with Linux 2.6.20, you need to use
kvm-12.
If you use the modules bundled with Linux 2.6.21, you need to use
kvm-17.
Modules from Linux 2.6.22 and up will work with any kvm version from
kvm-22. Some features may only be available in newer releases.
For best performance, use Linux 2.6.23-rc2 or later as the host.
http://kvm.qumranet.com
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Signature · 8 lines

Thanks
Yang, Sheng

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Avi Kivity

author

2007-11-05 15:49 UTC #7 lore raw

Quoted 4 lines · Sheng Yang

Quoted 2 lines · On Friday 02 November 2007 09:10:31 Haydn Solomon wrote:
How can I tell that my cpu has flexpriority?

Quoted 10 lines

Quoted 2 lines
(Resending this as didn't cc list last time.)
Try attached "printk" patch.
And generally, E6850, E6750, E6550, Core2 Duo processors starting from
G0 stepping should support this.

Would be nice to have /proc/cpuinfo show this (and othe vmx/svm features).

Signature · 8 lines

Any sufficiently difficult bug is indistinguishable from a feature.


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Sheng Yang

2007-11-02 01:36 UTC #8 lore raw

In reply to a message not in the archive

Quoted 3 lines · On Friday 02 November 2007 09:10:31 Haydn Solomon wrote:

How can I tell that my cpu has flexpriority?
(Resending this as didn't cc list last time.)

Oops, forgot the patch...

Quoted 40 lines · Avi Kivity

Quoted 38 lines
Today's big change is FlexPriority, which drastically improves Windows SMP and/or ACPI performance on newer Intel processors.
Changes from kvm-49:
- fix smp_call_function_mask() emulation on preemptible kernels
- move libkvm into own directory (Hollis Blanchard)
- fix save/restore/migrate for new memory slot management (Uri Lublin)
- compile fixes (Uri Lublin, me)
- fix recursive locking on mmap() (Anthony Liguori)
- remove some cr2 dependencies from x86 emulator
- further simplify x86 emulator
- more portability work (Carsten Otte, Hollis Blanchard)
- Intel FlexPriority support (Sheng Yang)
- fix dirty page tracking on aliased pages (Uri Lublin)
Notes:
If you use the modules bundled with kvm-50, you can use any version
of Linux from 2.6.9 upwards.
If you use the modules bundled with Linux 2.6.20, you need to use
kvm-12.
If you use the modules bundled with Linux 2.6.21, you need to use
kvm-17.
Modules from Linux 2.6.22 and up will work with any kvm version from
kvm-22. Some features may only be available in newer releases.
For best performance, use Linux 2.6.23-rc2 or later as the host.
http://kvm.qumranet.com
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Signature · 2 lines

Thanks
Yang, Sheng

drivers/kvm/vmx.c +4 -1

index 42e7fad..8f01c8d 100644
@@ -1684,9 +1684,12 @@ static int vmx_vcpu_reset(struct kvm_vcpu *vcpu)
 		vmcs_write32(TPR_THRESHOLD, 0);
 	}
 
-	if (vm_need_virtualize_apic_accesses(vmx->vcpu.kvm))
+	if (vm_need_virtualize_apic_accesses(vmx->vcpu.kvm)) {
 		vmcs_write64(APIC_ACCESS_ADDR,
 			     page_to_phys(vmx->vcpu.kvm->apic_access_page));
+		if (vm_need_tpr_shadow(vmx->vcpu.kvm))
+			printk(KERN_INFO "kvm: FlexPriority enabled!\n");
+	}
 
 	vmx->vcpu.cr0 = 0x60000010;
 	vmx_set_cr0(&vmx->vcpu, vmx->vcpu.cr0); /* enter rmode */

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Haydn Solomon

2007-11-02 01:54 UTC #10 lore raw

Quoted 6 lines · Sheng Yang

Quoted 3 lines · On Friday 02 November 2007 09:10:31 Haydn Solomon wrote:
How can I tell that my cpu has flexpriority?
(Resending this as didn't cc list last time.)
Oops, forgot the patch...

Thanks Sheng.

Luckily for me I've got the Flexpriority feature

[root@localhost winxptest]# dmesg | grep lex
kvm: FlexPriority enabled!

One thing I do notice apart from noticeably very good responsiveness and performance on windows guest ( xp sp2 ) is that this is the lowest cpu usage I've seen on the qemu kvm process to date. I haven't tried smp yet but that will be my next test and will report on how that goes. Thanks guys and well done!

Quoted 48 lines

Quoted 18 lines · Avi Kivity
Quoted 15 lines
Today's big change is FlexPriority, which drastically improves Windows SMP and/or ACPI performance on newer Intel processors.
Changes from kvm-49:
- fix smp_call_function_mask() emulation on preemptible kernels
- move libkvm into own directory (Hollis Blanchard)
- fix save/restore/migrate for new memory slot management (Uri Lublin)
- compile fixes (Uri Lublin, me)
- fix recursive locking on mmap() (Anthony Liguori)
- remove some cr2 dependencies from x86 emulator
- further simplify x86 emulator
- more portability work (Carsten Otte, Hollis Blanchard)
- Intel FlexPriority support (Sheng Yang)
- fix dirty page tracking on aliased pages (Uri Lublin)
Quoted 2 lines
Quoted 2 lines
Notes:
If you use the modules bundled with kvm-50, you can use any
version
Quoted 6 lines
Quoted 6 lines
of Linux from 2.6.9 upwards.
If you use the modules bundled with Linux 2.6.20, you need to use
kvm-12.
If you use the modules bundled with Linux 2.6.21, you need to use
kvm-17.
Modules from Linux 2.6.22 and up will work with any kvm version
from
Quoted 7 lines
Quoted 7 lines
kvm-22. Some features may only be available in newer releases.
For best performance, use Linux 2.6.23-rc2 or later as the host.
http://kvm.qumranet.com
-------------------------------------------------------------------------
Quoted 3 lines
Quoted 3 lines
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Quoted 5 lines
Quoted 5 lines
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_______________________________________________
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Quoted 4 lines

--
Thanks
Yang, Sheng

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Haydn Solomon

2007-11-02 02:14 UTC #12 lore raw

Quoted 16 lines · Haydn Solomon

Quoted 6 lines · Sheng Yang
Quoted 3 lines · On Friday 02 November 2007 09:10:31 Haydn Solomon wrote:
How can I tell that my cpu has flexpriority?
(Resending this as didn't cc list last time.)
Oops, forgot the patch...
Thanks Sheng.
Luckily for me I've got the Flexpriority feature

Quoted 9 lines

[root@localhost winxptest]# dmesg | grep lex
kvm: FlexPriority enabled!
One thing I do notice apart from noticeably very good responsiveness and performance on windows guest ( xp sp2 ) is that this is the lowest cpu usage I've seen on the qemu kvm process to date. I haven't tried smp yet but that will be my next test and will report on how that goes. Thanks guys and well done!

One issue I do see. When I run my windows xp guest which is ACPI Multiprocessor PC HAL with -smp 2, it runs much slower and cpu usage is high.

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Yang, Sheng

2007-11-02 02:19 UTC #14 lore raw

From: Haydn Solomon [mailto:[email protected]]
Sent: 2007年11月2日 10:15
To: Yang, Sheng
Cc: [email protected]; Avi Kivity
Subject: Re: [kvm-devel] [ANNOUNCE] kvm-49 release

On Nov 1, 2007 9:54 PM, Haydn Solomon <[email protected]> wrote:

On Nov 1, 2007 9:36 PM, Sheng Yang <[email protected]> wrote:

On Friday 02 November 2007 09:10:31 Haydn Solomon wrote:

> How can I tell that my cpu has flexpriority? >
> (Resending this as didn't cc list last time.)

Oops, forgot the patch...

Thanks Sheng.

Luckily for me I've got the Flexpriority feature

[root@localhost winxptest]# dmesg | grep lex
kvm: FlexPriority enabled!

One thing I do notice apart from noticeably very good responsiveness and performance on windows guest ( xp sp2 ) is that this is the lowest cpu usage I've seen on the qemu kvm process to date. I haven't tried smp yet but that will be my next test and will report on how that goes. Thanks guys and well done!

One issue I do see. When I run my windows xp guest which is ACPI Multiprocessor PC HAL with -smp 2, it runs much slower and cpu usage is high.

Thanks, I am checking it. :)

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Sheng Yang

2007-11-02 03:15 UTC #15 lore raw

In reply to a message not in the archive

Quoted 22 lines · On Friday 02 November 2007 10:14:35 Haydn Solomon wrote:

Quoted 12 lines · Haydn Solomon
Quoted 6 lines · Sheng Yang
Quoted 3 lines · On Friday 02 November 2007 09:10:31 Haydn Solomon wrote:
How can I tell that my cpu has flexpriority?
(Resending this as didn't cc list last time.)
Oops, forgot the patch...
Thanks Sheng.
Luckily for me I've got the Flexpriority feature
Quoted 8 lines
[root@localhost winxptest]# dmesg | grep lex
kvm: FlexPriority enabled!
One thing I do notice apart from noticeably very good responsiveness and performance on windows guest ( xp sp2 ) is that this is the lowest cpu usage I've seen on the qemu kvm process to date. I haven't tried smp yet but that will be my next test and will report on how that goes. Thanks guys and well done!

Quoted 3 lines

One issue I do see. When I run my windows xp guest which is ACPI Multiprocessor PC HAL with -smp 2, it runs much slower and cpu usage is high.

Please try the attach patch.

Signature · 2 lines

Thanks
Yang, Sheng

From 8009718459efe41e0e8bc943a62734353c7828a2 Mon Sep 17 00:00:00 2001
From: Sheng Yang <[email protected]>
Date: Fri, 2 Nov 2007 11:15:15 +0800
Subject: [PATCH] KVM: VMX: Fix repeatly allocate of apic access page

For SMP guest, alloc_apic_access_page() would be called more than once. So only the last one works, causing SMP guest can't benifit from FlexPriority.

This patch fixed this issue.

Signed-off-by Sheng Yang <[email protected]>

---
 drivers/kvm/kvm_main.c |    1 +
 drivers/kvm/vmx.c      |    2 ++
 2 files changed, 3 insertions(+), 0 deletions(-)

drivers/kvm/kvm_main.c +1 -0

index 34a681d..519626d 100644
@@ -245,6 +245,7 @@ static struct kvm *kvm_create_vm(void)
 	spin_lock(&kvm_lock);
 	list_add(&kvm->vm_list, &vm_list);
 	spin_unlock(&kvm_lock);
+	kvm->apic_access_page = NULL;
 	return kvm;
 }

drivers/kvm/vmx.c +2 -0

index 42e7fad..de4441a 100644
@@ -1466,6 +1466,8 @@ static int alloc_apic_access_page(struct kvm *kvm)
 	int r;
 
 	r = -EFAULT;
+	if (kvm->apic_access_page)
+		return 0;
 	kvm_userspace_mem.slot = APIC_ACCESS_PAGE_PRIVATE_MEMSLOT;
 	kvm_userspace_mem.flags = 0;
 	kvm_userspace_mem.guest_phys_addr = 0xfee00000ULL;

Signature · 1 line

1.5.2

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Haydn Solomon

2007-11-02 04:56 UTC #17 lore raw

Quoted 22 lines · Sheng Yang

Quoted 9 lines · On Friday 02 November 2007 10:14:35 Haydn Solomon wrote:
Quoted 8 lines · Haydn Solomon
Quoted 6 lines · Sheng Yang
Quoted 3 lines · On Friday 02 November 2007 09:10:31 Haydn Solomon wrote:
How can I tell that my cpu has flexpriority?
(Resending this as didn't cc list last time.)
Oops, forgot the patch...
Quoted 8 lines
Quoted 8 lines
Thanks Sheng.
Luckily for me I've got the Flexpriority feature
[root@localhost winxptest]# dmesg | grep lex
kvm: FlexPriority enabled!
One thing I do notice apart from noticeably very good responsiveness
and
Quoted 2 lines
Quoted 2 lines
performance on windows guest ( xp sp2 ) is that this is the lowest cpu usage I've seen on the qemu kvm process to date. I haven't tried smp
yet

Quoted 9 lines

Quoted 6 lines
Quoted 2 lines
but that will be my next test and will report on how that goes. Thanks guys and well done!
One issue I do see. When I run my windows xp guest which is ACPI Multiprocessor PC HAL with -smp 2, it runs much slower and cpu usage is high.
Please try the attach patch.

Oh yeah... this is much much better. Windows seems to performing extremely fast and cpu usage is very low using -smp 2 after applying this patch. Thank you.

Quoted 5 lines

--
Thanks
Yang, Sheng

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Sheng Yang

2007-11-02 04:57 UTC #19 lore raw

Quoted 35 lines · On Friday 02 November 2007 12:56:26 Haydn Solomon wrote:

Quoted 34 lines · Sheng Yang
Quoted 9 lines · On Friday 02 November 2007 10:14:35 Haydn Solomon wrote:
Quoted 8 lines · Haydn Solomon
Quoted 6 lines · Sheng Yang
Quoted 3 lines · On Friday 02 November 2007 09:10:31 Haydn Solomon wrote:
How can I tell that my cpu has flexpriority?
(Resending this as didn't cc list last time.)
Oops, forgot the patch...
Quoted 8 lines
Quoted 8 lines
Thanks Sheng.
Luckily for me I've got the Flexpriority feature
[root@localhost winxptest]# dmesg | grep lex
kvm: FlexPriority enabled!
One thing I do notice apart from noticeably very good responsiveness
and
Quoted 3 lines
Quoted 3 lines
performance on windows guest ( xp sp2 ) is that this is the lowest cpu usage I've seen on the qemu kvm process to date. I haven't tried smp
yet
Quoted 6 lines
Quoted 2 lines
but that will be my next test and will report on how that goes. Thanks guys and well done!
One issue I do see. When I run my windows xp guest which is ACPI Multiprocessor PC HAL with -smp 2, it runs much slower and cpu usage is high.

Quoted 6 lines

Quoted 1 line
Please try the attach patch.
Oh yeah... this is much much better. Windows seems to performing extremely fast and cpu usage is very low using -smp 2 after applying this patch. Thank you.

My pleasure. :)

I will send this patch out.

Signature · 8 lines

Thanks
Yang, Sheng

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Zhao, Yunfeng

2007-11-02 01:55 UTC #20 lore raw

In reply to a message not in the archive

Save/restore still fails in today's testing.

kvm_get_mem_map failed: Unknown error 18446744073709551594

Thanks
Yunfeng
-----Original Message-----
From: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org [mailto:kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org] On Behalf Of Avi Kivity
Sent: 2007年11月2日 7:12
To: kvm-devel
Subject: [kvm-devel] [ANNOUNCE] kvm-49 release

Today's big change is FlexPriority, which drastically improves Windows SMP and/or ACPI performance on newer Intel processors.

Changes from kvm-49:
- fix smp_call_function_mask() emulation on preemptible kernels
- move libkvm into own directory (Hollis Blanchard)
- fix save/restore/migrate for new memory slot management (Uri Lublin)
- compile fixes (Uri Lublin, me)
- fix recursive locking on mmap() (Anthony Liguori)
- remove some cr2 dependencies from x86 emulator
- further simplify x86 emulator
- more portability work (Carsten Otte, Hollis Blanchard)
- Intel FlexPriority support (Sheng Yang)
- fix dirty page tracking on aliased pages (Uri Lublin)

Notes:
If you use the modules bundled with kvm-50, you can use any version
of Linux from 2.6.9 upwards.
If you use the modules bundled with Linux 2.6.20, you need to use
kvm-12.
If you use the modules bundled with Linux 2.6.21, you need to use
kvm-17.
Modules from Linux 2.6.22 and up will work with any kvm version from
kvm-22. Some features may only be available in newer releases.
For best performance, use Linux 2.6.23-rc2 or later as the host.

http://kvm.qumranet.com

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Avi Kivity

author

2007-11-04 07:47 UTC #22 lore raw

Quoted 5 lines · Yunfeng

Save/restore still fails in today's testing.
kvm_get_mem_map failed: Unknown error 18446744073709551594

Izik/Uri, did I miss a patch?

I did a save/restore previously and it worked, but perhaps something else is broken.

Signature · 1 line

Any sufficiently difficult bug is indistinguishable from a feature.

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Izik Eidus

2007-11-04 07:42 UTC #24 lore raw

Quoted 10 lines · Avi Kivity

Quoted 5 lines · Yunfeng
Save/restore still fails in today's testing.
kvm_get_mem_map failed: Unknown error 18446744073709551594
Izik/Uri, did I miss a patch?
I did a save/restore previously and it worked, but perhaps something else is broken.

i will check this

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