From: Salil Mehta <salil.mehta@huawei.com>
To: "wangyanan (Y)" <wangyanan55@huawei.com>
Cc: "Song Bao Hua (Barry Song)" <song.bao.hua@hisilicon.com>,
"Peter Maydell" <peter.maydell@linaro.org>,
"Andrew Jones" <drjones@redhat.com>,
"linuxarm@openeuler.org" <linuxarm@openeuler.org>,
"Michael S . Tsirkin" <mst@redhat.com>,
"Wanghaibin (D)" <wanghaibin.wang@huawei.com>,
zhukeqian <zhukeqian1@huawei.com>,
"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>,
yangyicong <yangyicong@huawei.com>,
"Shannon Zhao" <shannon.zhaosl@gmail.com>,
"qemu-arm@nongnu.org" <qemu-arm@nongnu.org>,
"Alistair Francis" <alistair.francis@wdc.com>,
"Zengtao (B)" <prime.zeng@hisilicon.com>,
"Paolo Bonzini" <pbonzini@redhat.com>,
yuzenghui <yuzenghui@huawei.com>,
"Igor Mammedov" <imammedo@redhat.com>,
"Philippe Mathieu-Daudé" <philmd@redhat.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"David Gibson" <david@gibson.dropbear.id.au>
Subject: RE: [RFC PATCH v3 4/9] hw/arm/virt: Initialize the present cpu members
Date: Tue, 18 May 2021 07:04:51 +0000 [thread overview]
Message-ID: <6d8b9142e8a34d1390f2f0b4bfb53a00@huawei.com> (raw)
In-Reply-To: <68883a1b-5303-da13-a051-e909e1d1f71b@huawei.com>
> From: wangyanan (Y)
> Sent: Tuesday, May 18, 2021 5:43 AM
>
> Hi Salil,
>
> On 2021/5/18 4:48, Salil Mehta wrote:
> >> From: Qemu-arm
> [mailto:qemu-arm-bounces+salil.mehta=huawei.com@nongnu.org]
> >> On Behalf Of Yanan Wang
> >> Sent: Sunday, May 16, 2021 11:29 AM
> >> To: Peter Maydell <peter.maydell@linaro.org>; Andrew Jones
> >> <drjones@redhat.com>; Michael S . Tsirkin <mst@redhat.com>; Igor Mammedov
> >> <imammedo@redhat.com>; Shannon Zhao <shannon.zhaosl@gmail.com>; Alistair
> >> Francis <alistair.francis@wdc.com>; David Gibson
> >> <david@gibson.dropbear.id.au>; qemu-devel@nongnu.org; qemu-arm@nongnu.org
> >> Cc: Song Bao Hua (Barry Song) <song.bao.hua@hisilicon.com>; zhukeqian
> >> <zhukeqian1@huawei.com>; yangyicong <yangyicong@huawei.com>; Zengtao (B)
> >> <prime.zeng@hisilicon.com>; Wanghaibin (D) <wanghaibin.wang@huawei.com>;
> >> yuzenghui <yuzenghui@huawei.com>; Paolo Bonzini <pbonzini@redhat.com>;
> >> Philippe Mathieu-Daudé <philmd@redhat.com>
> >> Subject: [RFC PATCH v3 4/9] hw/arm/virt: Initialize the present cpu members
> >>
> >> We create and initialize a cpuobj for each present cpu in
> >> machvirt_init(). Now we also initialize the cpu member of
> >> structure CPUArchId for each present cpu in the function.
> > [...]
> >
> >> qdev_realize(DEVICE(cpuobj), NULL, &error_fatal);
> >> +
> >> + /*
> >> + * As ARM cpu hotplug is not supported yet, we initialize
> >> + * the present cpu members here.
> >> + */
> >> + machine->possible_cpus->cpus[n].cpu = cpuobj;
> >
> > when vcpu Hotplug is not supported yet, what necessitates this change now?
> >
> The initialization will gives a way to determine whether a CPU is
> present or not.
> At least, for now it will be used when generating ACPI tables, e.g.
> DSDT, MADT.
> See patch 5 and 6.
yes, but why do you require it now as part of the vcpu topology change?
As-far-as-i-can-see, PPTT table changes(part of patch 5/9) do not require
this change. Change in Patch 5/9 has also been done in anticipation of
some future requirement(vcpu Hotplug?).
Please correct me here if I am wrong?
Thanks
next prev parent reply other threads:[~2021-05-18 7:05 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-16 10:28 [RFC PATCH v3 0/9] hw/arm/virt: Introduce cpu topology support Yanan Wang
2021-05-16 10:28 ` [RFC PATCH v3 1/9] hw/arm/virt: Disable cpu topology support on older machine types Yanan Wang
2021-05-16 10:28 ` [RFC PATCH v3 2/9] device_tree: Add qemu_fdt_add_path Yanan Wang
2021-05-17 3:11 ` David Gibson
2021-05-17 13:18 ` wangyanan (Y)
2021-05-17 6:27 ` Andrew Jones
2021-05-17 13:21 ` wangyanan (Y)
2021-05-16 10:28 ` [RFC PATCH v3 3/9] hw/arm/virt: Add cpu-map to device tree Yanan Wang
2021-05-17 6:41 ` Andrew Jones
2021-05-17 15:00 ` wangyanan (Y)
2021-05-18 7:46 ` Andrew Jones
2021-05-18 10:50 ` wangyanan (Y)
2021-05-16 10:28 ` [RFC PATCH v3 4/9] hw/arm/virt: Initialize the present cpu members Yanan Wang
2021-05-17 6:43 ` Andrew Jones
2021-05-17 20:48 ` Salil Mehta
2021-05-18 4:42 ` wangyanan (Y)
2021-05-18 7:04 ` Salil Mehta [this message]
2021-05-18 7:50 ` Andrew Jones
2021-05-18 18:50 ` Salil Mehta
2021-05-16 10:28 ` [RFC PATCH v3 5/9] hw/arm/virt-acpi-build: Use possible cpus in generation of DSDT Yanan Wang
2021-05-16 10:28 ` [RFC PATCH v3 6/9] hw/arm/virt-acpi-build: Use possible cpus in generation of MADT Yanan Wang
2021-05-17 7:42 ` Andrew Jones
2021-05-17 16:27 ` wangyanan (Y)
2021-05-18 8:15 ` Andrew Jones
2021-05-18 11:47 ` wangyanan (Y)
2021-05-18 13:40 ` Andrew Jones
2021-05-17 17:07 ` Salil Mehta
2021-05-18 5:02 ` wangyanan (Y)
2021-05-18 6:47 ` Salil Mehta
2021-05-18 11:58 ` wangyanan (Y)
2021-05-16 10:28 ` [RFC PATCH v3 7/9] hw/acpi/aml-build: Add Processor hierarchy node structure Yanan Wang
2021-05-17 7:47 ` Andrew Jones
2021-05-16 10:28 ` [RFC PATCH v3 8/9] hw/arm/virt-acpi-build: Generate PPTT table Yanan Wang
2021-05-17 8:02 ` Andrew Jones
2021-05-17 13:43 ` wangyanan (Y)
2021-05-17 14:45 ` Andrew Jones
2021-05-17 16:02 ` wangyanan (Y)
2021-05-16 10:29 ` [RFC PATCH v3 9/9] hw/arm/virt: Add separate -smp parsing function for ARM machines Yanan Wang
2021-05-17 8:24 ` Andrew Jones
2021-05-18 2:16 ` wangyanan (Y)
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