On Fri, Oct 28, 2022 at 04:15:15PM +0100, James Morse wrote:

Hi Joyce,

I have meetings between 14:00 and 16:30 UK time on November the 2nd. 13:00 and 17:00 are free if that day is better for everyone else...

I can do Wednesday November 2nd at 14:00 CET - if for anyone else tomorrow (Nov 1st) is better you should go ahead with the current setting and I will catch up with the recordings.

Lorenzo

On Zhangfei's question, I think you need Lorenzo and/or Jean, who I assume have the context to this.

Thanks,

James

On 28/10/2022 15:14, Joyce Qi wrote:

...

Hi Lorenzo,

I have noticed you are in holiday on Nov,1st. I can switch the meeting to Nov 2nd if other people are free.

@Lorenzo,James,

Can we arrange Zhangfei’s questions( TLB missing impact the performance in vsva/ sva) as below in next meeting. Or can you help involve any other experts focus on this? Appreciated so much for your help here.

Thanks:) Joyce

...

在 2022年10月28日，上午8:00，linaro-open-discussions-request@op-lists.linaro.org 写道：

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Today's Topics:

1. Re: Linaro-open-discussions Digest, Vol 25, Issue 3 (Zhangfei Gao)

---

Message: 1 Date: Thu, 27 Oct 2022 12:06:59 +0800 From: Zhangfei Gao zhangfei.gao@linaro.org Subject: [Linaro-open-discussions] Re: Linaro-open-discussions Digest, Vol 25, Issue 3 To: Joyce Qi joyce.qi@linaro.org, Lorenzo Pieralisi lorenzo.pieralisi@linaro.org, jean-philippe jean-philippe@linaro.org Cc: linaro-open-discussions@op-lists.linaro.org, linux@armlinux.org.uk Message-ID: 2fba7536-1475-4755-9084-a920addecc42@linaro.org Content-Type: text/plain; charset=utf-8; format=flowed

Hi, Lorenzo

When we debug vsva, sva on guest with 2-stage translation, we found tlb miss impact performance a lot, with Jean's help.

Currently we are using huge page feature in glibc to overcome this issue. With huge page, vsva in guest can achieve comparable performance as sva in host.

More details: https://docs.qq.com/doc/DRXlpQmpTSlBZTGZZ Will do some

Basically we are using two optimization methods/ host sva: using memset fist to overcome io page fault, since cpu alloc physical memory is much faster than smmu. guest vsva: using huge page to overcome tlbmiss.

The customer are asking whether (next version) silicon (smmu) can do some help to concur tlb miss issue or io page fault issue. If so, software can be simpler. Any suggestions?

Thanks

On 2022/10/20 下午8:47, Joyce Qi via Linaro-open-discussions wrote:

...

Hi Jonathan,Lorenzo,all,

Do we have any topic to sync on our LOD meeting next week?

Thanks:) Joyce

---

Subject: Digest Footer

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---

End of Linaro-open-discussions Digest, Vol 25, Issue 9

---

On Mon, 31 Oct 2022 20:31:23 +0800 Joyce Qi joyce.qi@linaro.org wrote:

Hi James, Lorenzo,

Thanks for recommendation and feedback.

Since both of you are the key person for the meeting. So how about starting from Nov 2nd, 13:30 CET time?

13:30~14:00, James can talk about vCPU Hotplug topic 14:00~14:30 Lorenzo can attend Zhangfei’s topic.

Does the time work for everyone?

or we can postpone the meeting to Nov, 8th?

8th clashes with the Linaro Partners meeting, so I can't make that. 2nd works for me.

Thanks:) Joyce

...

在 2022年10月31日，下午4:42，Lorenzo Pieralisi lorenzo.pieralisi@linaro.org 写道：

On Fri, Oct 28, 2022 at 04:15:15PM +0100, James Morse wrote:

...

Hi Joyce,

I have meetings between 14:00 and 16:30 UK time on November the 2nd. 13:00 and 17:00 are free if that day is better for everyone else...

I can do Wednesday November 2nd at 14:00 CET - if for anyone else tomorrow (Nov 1st) is better you should go ahead with the current setting and I will catch up with the recordings.

Lorenzo

...

On Zhangfei's question, I think you need Lorenzo and/or Jean, who I assume have the context to this.

Thanks,

James

On 28/10/2022 15:14, Joyce Qi wrote:

...

Hi Lorenzo,

I have noticed you are in holiday on Nov,1st. I can switch the meeting to Nov 2nd if other people are free.

@Lorenzo,James,

Can we arrange Zhangfei’s questions( TLB missing impact the performance in vsva/ sva) as below in next meeting. Or can you help involve any other experts focus on this? Appreciated so much for your help here.

Thanks:) Joyce

...

在 2022年10月28日，上午8:00，linaro-open-discussions-request@op-lists.linaro.org 写道：

Send Linaro-open-discussions mailing list submissions to linaro-open-discussions@op-lists.linaro.org

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Today's Topics:

1. Re: Linaro-open-discussions Digest, Vol 25, Issue 3 (Zhangfei

Gao)

---

Message: 1 Date: Thu, 27 Oct 2022 12:06:59 +0800 From: Zhangfei Gao zhangfei.gao@linaro.org Subject: [Linaro-open-discussions] Re: Linaro-open-discussions Digest, Vol 25, Issue 3 To: Joyce Qi joyce.qi@linaro.org, Lorenzo Pieralisi lorenzo.pieralisi@linaro.org, jean-philippe jean-philippe@linaro.org Cc: linaro-open-discussions@op-lists.linaro.org, linux@armlinux.org.uk Message-ID: 2fba7536-1475-4755-9084-a920addecc42@linaro.org Content-Type: text/plain; charset=utf-8; format=flowed

Hi, Lorenzo

When we debug vsva, sva on guest with 2-stage translation, we found tlb miss impact performance a lot, with Jean's help.

Currently we are using huge page feature in glibc to overcome this issue. With huge page, vsva in guest can achieve comparable performance as sva in host.

More details: https://docs.qq.com/doc/DRXlpQmpTSlBZTGZZ Will do some

Basically we are using two optimization methods/ host sva: using memset fist to overcome io page fault, since cpu alloc physical memory is much faster than smmu. guest vsva: using huge page to overcome tlbmiss.

The customer are asking whether (next version) silicon (smmu) can do some help to concur tlb miss issue or io page fault issue. If so, software can be simpler. Any suggestions?

Thanks

On 2022/10/20 下午8:47, Joyce Qi via Linaro-open-discussions wrote:

...

Hi Jonathan,Lorenzo,all,

Do we have any topic to sync on our LOD meeting next week?

Thanks:) Joyce

---

Subject: Digest Footer

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---

End of Linaro-open-discussions Digest, Vol 25, Issue 9

---

On Mon, Oct 31, 2022 at 08:31:23PM +0800, Joyce Qi wrote:

Hi James, Lorenzo,

Thanks for recommendation and feedback.

Since both of you are the key person for the meeting. So how about starting from Nov 2nd, 13:30 CET time?

13:30~14:00, James can talk about vCPU Hotplug topic 14:00~14:30 Lorenzo can attend Zhangfei’s topic.

I can't do 13:30 CET time and I don't have time to prepare for Zhangfei's topic, so please don't expect I can help on that on November 2nd.

I can only do 14:00 CET on Wednesday; I would suggest you keep things as they are tomorrow so that progress can be made on the vCPU hotplug topic, if you really need me 14:00 CET on November 2nd is all I can do, so I let others decide.

Thanks, Lorenzo

Does the time work for everyone?

or we can postpone the meeting to Nov, 8th?

Thanks:) Joyce

...

在 2022年10月31日，下午4:42，Lorenzo Pieralisi lorenzo.pieralisi@linaro.org 写道：

On Fri, Oct 28, 2022 at 04:15:15PM +0100, James Morse wrote:

...

Hi Joyce,

I have meetings between 14:00 and 16:30 UK time on November the 2nd. 13:00 and 17:00 are free if that day is better for everyone else...

I can do Wednesday November 2nd at 14:00 CET - if for anyone else tomorrow (Nov 1st) is better you should go ahead with the current setting and I will catch up with the recordings.

Lorenzo

...

On Zhangfei's question, I think you need Lorenzo and/or Jean, who I assume have the context to this.

Thanks,

James

On 28/10/2022 15:14, Joyce Qi wrote:

...

Hi Lorenzo,

I have noticed you are in holiday on Nov,1st. I can switch the meeting to Nov 2nd if other people are free.

@Lorenzo,James,

Can we arrange Zhangfei’s questions( TLB missing impact the performance in vsva/ sva) as below in next meeting. Or can you help involve any other experts focus on this? Appreciated so much for your help here.

Thanks:) Joyce

...

在 2022年10月28日，上午8:00，linaro-open-discussions-request@op-lists.linaro.org 写道：

Send Linaro-open-discussions mailing list submissions to linaro-open-discussions@op-lists.linaro.org

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When replying, please edit your Subject line so it is more specific than "Re: Contents of Linaro-open-discussions digest..."

Today's Topics:

1. Re: Linaro-open-discussions Digest, Vol 25, Issue 3 (Zhangfei Gao)

---

Message: 1 Date: Thu, 27 Oct 2022 12:06:59 +0800 From: Zhangfei Gao zhangfei.gao@linaro.org Subject: [Linaro-open-discussions] Re: Linaro-open-discussions Digest, Vol 25, Issue 3 To: Joyce Qi joyce.qi@linaro.org, Lorenzo Pieralisi lorenzo.pieralisi@linaro.org, jean-philippe jean-philippe@linaro.org Cc: linaro-open-discussions@op-lists.linaro.org, linux@armlinux.org.uk Message-ID: 2fba7536-1475-4755-9084-a920addecc42@linaro.org Content-Type: text/plain; charset=utf-8; format=flowed

Hi, Lorenzo

When we debug vsva, sva on guest with 2-stage translation, we found tlb miss impact performance a lot, with Jean's help.

Currently we are using huge page feature in glibc to overcome this issue. With huge page, vsva in guest can achieve comparable performance as sva in host.

More details: https://docs.qq.com/doc/DRXlpQmpTSlBZTGZZ Will do some

Basically we are using two optimization methods/ host sva: using memset fist to overcome io page fault, since cpu alloc physical memory is much faster than smmu. guest vsva: using huge page to overcome tlbmiss.

The customer are asking whether (next version) silicon (smmu) can do some help to concur tlb miss issue or io page fault issue. If so, software can be simpler. Any suggestions?

Thanks

On 2022/10/20 下午8:47, Joyce Qi via Linaro-open-discussions wrote:

...

Hi Jonathan,Lorenzo,all,

Do we have any topic to sync on our LOD meeting next week?

Thanks:) Joyce

---

Subject: Digest Footer

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---

End of Linaro-open-discussions Digest, Vol 25, Issue 9

---

Hi Lorenzo，Zhangfei，

Thanks for your coordination，so we can still hold the vCPU Hotplug meeting on Nov 1st as scheduled. And move Zhangfei’s topic to next time for more time to prepare.

Thanks :) Joyce

在 2022年10月31日，下午10:08，Zhangfei Gao zhangfei.gao@linaro.org 写道：

On 2022/10/31 下午9:55, Lorenzo Pieralisi wrote:

...

On Mon, Oct 31, 2022 at 08:31:23PM +0800, Joyce Qi wrote:

...

Hi James, Lorenzo,

Thanks for recommendation and feedback.

Since both of you are the key person for the meeting. So how about starting from Nov 2nd, 13:30 CET time?

13:30~14:00, James can talk about vCPU Hotplug topic 14:00~14:30 Lorenzo can attend Zhangfei’s topic.

I can't do 13:30 CET time and I don't have time to prepare for Zhangfei's topic, so please don't expect I can help on that on November 2nd.

We can leave this topic next time, it is not urgent, just want to check any better solution.

Thanks Lorenzo

...

I can only do 14:00 CET on Wednesday; I would suggest you keep things as they are tomorrow so that progress can be made on the vCPU hotplug topic, if you really need me 14:00 CET on November 2nd is all I can do, so I let others decide.

Thanks, Lorenzo

Hi Salil，

It will be at 10:00pm Beijing time,14:00~15:00 BST time.

Thanks:) Joyce

在 2022年11月1日，上午12:04，Salil Mehta salil.mehta@huawei.com 写道：

Hi Joyce, I am okay with the 1st November. For the clarity, could you please reconfirm the time of tomorrow's meeting?

Many thanks Salil

...

From: Joyce Qi [mailto:joyce.qi@linaro.org] Sent: Monday, October 31, 2022 2:18 PM To: Zhangfei Gao zhangfei.gao@linaro.org Cc: Lorenzo Pieralisi lorenzo.pieralisi@linaro.org; James Morse james.morse@arm.com; Jonathan Cameron via Linaro-open-discussions linaro-open-discussions@op-lists.linaro.org; Jonathan Cameron jonathan.cameron@huawei.com; Salil Mehta salil.mehta@huawei.com Subject: Re: Linaro-open-discussions Digest, Vol 25, Issue 9

Hi Lorenzo，Zhangfei，

Thanks for your coordination，so we can still hold the vCPU Hotplug meeting on Nov 1st as scheduled. And move Zhangfei’s topic to next time for more time to prepare.

Thanks :) Joyce

...

在 2022年10月31日，下午10:08，Zhangfei Gao zhangfei.gao@linaro.org 写道：

On 2022/10/31 下午9:55, Lorenzo Pieralisi wrote:

...

On Mon, Oct 31, 2022 at 08:31:23PM +0800, Joyce Qi wrote:

...

Hi James, Lorenzo,

Thanks for recommendation and feedback.

Since both of you are the key person for the meeting. So how about starting from Nov 2nd, 13:30 CET time?

13:30~14:00, James can talk about vCPU Hotplug topic 14:00~14:30 Lorenzo can attend Zhangfei’s topic.

I can't do 13:30 CET time and I don't have time to prepare for Zhangfei's topic, so please don't expect I can help on that on November 2nd.

We can leave this topic next time, it is not urgent, just want to check any

better solution.

...

Thanks Lorenzo

...

I can only do 14:00 CET on Wednesday; I would suggest you keep things as they are tomorrow so that progress can be made on the vCPU hotplug topic, if you really need me 14:00 CET on November 2nd is all I can do, so I let others decide.

Thanks, Lorenzo

Hi Jonanthan，Lorenzo，all

Do we have any special topic next Tuesday？

@Lorenzo，

Not sure if we can also sync on Zhangfei’s topic this time？

Thanks：） Joyce

在 2022年10月31日，下午10:17，Joyce Qi joyce.qi@linaro.org 写道：

Hi Lorenzo，Zhangfei，

Thanks for your coordination，so we can still hold the vCPU Hotplug meeting on Nov 1st as scheduled. And move Zhangfei’s topic to next time for more time to prepare.

Thanks :) Joyce

...

在 2022年10月31日，下午10:08，Zhangfei Gao zhangfei.gao@linaro.org 写道：

On 2022/10/31 下午9:55, Lorenzo Pieralisi wrote:

...

On Mon, Oct 31, 2022 at 08:31:23PM +0800, Joyce Qi wrote:

...

Hi James, Lorenzo,

Thanks for recommendation and feedback.

Since both of you are the key person for the meeting. So how about starting from Nov 2nd, 13:30 CET time?

13:30~14:00, James can talk about vCPU Hotplug topic 14:00~14:30 Lorenzo can attend Zhangfei’s topic.

I can't do 13:30 CET time and I don't have time to prepare for Zhangfei's topic, so please don't expect I can help on that on November 2nd.

We can leave this topic next time, it is not urgent, just want to check any better solution.

Thanks Lorenzo

...

I can only do 14:00 CET on Wednesday; I would suggest you keep things as they are tomorrow so that progress can be made on the vCPU hotplug topic, if you really need me 14:00 CET on November 2nd is all I can do, so I let others decide.

Thanks, Lorenzo

From: Lorenzo Pieralisi lorenzo.pieralisi@linaro.org Sent: Thursday, November 17, 2022 4:40 PM To: Joyce Qi joyce.qi@linaro.org Cc: Zhangfei Gao zhangfei.gao@linaro.org; James Morse james.morse@arm.com; Jonathan Cameron via Linaro-open-discussions linaro-open-discussions@op-lists.linaro.org; Jonathan Cameron jonathan.cameron@huawei.com; Salil Mehta salil.mehta@huawei.com Subject: Re: Linaro-open-discussions Digest, Vol 25, Issue 9

On Thu, 17 Nov 2022 at 14:22, Joyce Qi joyce.qi@linaro.org wrote:

...

Hi Jonanthan，Lorenzo，all

Do we have any special topic next Tuesday？

I don't - if anything I need to catch up with vCPU hotplug discussions.

I don’t have much except that I have already shared the QEMU repositories with James and they contain PSCI and _STA.present Bit related changes.

I still have to reproduce the crash and related notification problem which James pointed out in his last update when '-device' option is used to cold-boot the vCPUs. Plus, the OSI strings related stuff might need some change in QEMU's ACPI AML as well?

Maybe James might want to share the results of the test of his repository with the latest QEMU changes?

But if anybody wants me to present something specific please let me know.

Thanks Salil.

...

@Lorenzo，

Not sure if we can also sync on Zhangfei’s topic this time？

I have not looked into it yet, sorry, I will investigate but I don't know if I will have anything to share by Tuesday.

Thanks, Lorenzo

...

Thanks：） Joyce

...

在 2022年10月31日，下午10:17，Joyce Qi joyce.qi@linaro.org 写道：

Hi Lorenzo，Zhangfei，

Thanks for your coordination，so we can still hold the vCPU Hotplug

meeting on Nov 1st as scheduled.

...

...

And move Zhangfei’s topic to next time for more time to prepare.

Thanks :) Joyce

...

在 2022年10月31日，下午10:08，Zhangfei Gao zhangfei.gao@linaro.org 写

道：

...

...

...

On 2022/10/31 下午9:55, Lorenzo Pieralisi wrote:

...

On Mon, Oct 31, 2022 at 08:31:23PM +0800, Joyce Qi wrote:

...

Hi James, Lorenzo,

Thanks for recommendation and feedback.

Since both of you are the key person for the meeting. So how about starting from Nov 2nd, 13:30 CET time?

13:30~14:00, James can talk about vCPU Hotplug topic 14:00~14:30 Lorenzo can attend Zhangfei’s topic.

I can't do 13:30 CET time and I don't have time to prepare for Zhangfei's topic, so please don't expect I can help on that on November 2nd.

We can leave this topic next time, it is not urgent, just want to

check any better solution.

...

...

...

Thanks Lorenzo

...

I can only do 14:00 CET on Wednesday; I would suggest you keep things as they are tomorrow so that progress can be made on the vCPU hotplug topic, if you really need me 14:00 CET on November 2nd is all I can do, so I let others decide.

Thanks, Lorenzo

Hi Joyce, You are welcome.

@James/Lorenzo, We are already at linux-6.1-rc6. do you think we would be able to send Linux kernel patches related to vCPU Hotplug to the community in this cycle?

Thanks Salil

From: Joyce Qi joyce.qi@linaro.org Sent: Monday, November 21, 2022 12:04 PM To: Salil Mehta salil.mehta@huawei.com Cc: Lorenzo Pieralisi lorenzo.pieralisi@linaro.org; Zhangfei Gao zhangfei.gao@linaro.org; James Morse james.morse@arm.com; linaro-open- discussions@op-lists.linaro.org; Jonathan Cameron jonathan.cameron@huawei.com Subject: Re: Linaro-open-discussions Digest, Vol 25, Issue 9

Hi Salil，Lorenzo，all

Thanks for the feedback. Maybe we can skip tomorrow’s meeting, and please sync me if needed.

Thanks:) Joyce

...

在 2022年11月18日，上午1:05，Salil Mehta salil.mehta@huawei.com 写道：

...

From: Lorenzo Pieralisi lorenzo.pieralisi@linaro.org Sent: Thursday, November 17, 2022 4:40 PM To: Joyce Qi joyce.qi@linaro.org Cc: Zhangfei Gao zhangfei.gao@linaro.org; James Morse james.morse@arm.com; Jonathan Cameron via Linaro-open-discussions linaro-open-discussions@op-lists.linaro.org; Jonathan Cameron jonathan.cameron@huawei.com; Salil Mehta salil.mehta@huawei.com Subject: Re: Linaro-open-discussions Digest, Vol 25, Issue 9

On Thu, 17 Nov 2022 at 14:22, Joyce Qi joyce.qi@linaro.org wrote:

...

Hi Jonanthan，Lorenzo，all

Do we have any special topic next Tuesday？

I don't - if anything I need to catch up with vCPU hotplug discussions.

I don’t have much except that I have already shared the QEMU repositories

with

...

James and they contain PSCI and _STA.present Bit related changes.

I still have to reproduce the crash and related notification problem

which

...

James pointed out in his last update when '-device' option is used to cold-boot the vCPUs. Plus, the OSI strings related stuff might need some change in QEMU's ACPI AML as well?

Maybe James might want to share the results of the test of his repository with the latest QEMU changes?

But if anybody wants me to present something specific please let me know.

Thanks Salil.

...

...

@Lorenzo，

Not sure if we can also sync on Zhangfei’s topic this time？

I have not looked into it yet, sorry, I will investigate but I don't

know

...

...

if I will have anything to share by Tuesday.

Thanks, Lorenzo

...

Thanks：） Joyce

...

在 2022年10月31日，下午10:17，Joyce Qi joyce.qi@linaro.org 写道：

Hi Lorenzo，Zhangfei，

Thanks for your coordination，so we can still hold the vCPU Hotplug

meeting on Nov 1st as scheduled.

...

...

And move Zhangfei’s topic to next time for more time to prepare.

Thanks :) Joyce

...

在 2022年10月31日，下午10:08，Zhangfei Gao zhangfei.gao@linaro.org 写

道：

...

...

...

On 2022/10/31 下午9:55, Lorenzo Pieralisi wrote: > On Mon, Oct 31, 2022 at 08:31:23PM +0800, Joyce Qi wrote: >> Hi James, Lorenzo, >> >> Thanks for recommendation and feedback. >> >> Since both of you are the key person for the meeting. >> So how about starting from Nov 2nd, 13:30 CET time? >> >> 13:30~14:00, James can talk about vCPU Hotplug topic >> 14:00~14:30 Lorenzo can attend Zhangfei’s topic. > I can't do 13:30 CET time and I don't have time to prepare > for Zhangfei's topic, so please don't expect I can help on > that on November 2nd.

We can leave this topic next time, it is not urgent, just want to

check any better solution.

...

...

...

Thanks Lorenzo > > I can only do 14:00 CET on Wednesday; I would suggest you > keep things as they are tomorrow so that progress can be > made on the vCPU hotplug topic, if you really need me > 14:00 CET on November 2nd is all I can do, so I let others > decide. > > Thanks, > Lorenzo