From: Gavin Shan <gshan@redhat.com>
To: Salil Mehta <salil.mehta@huawei.com>,
"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>,
"qemu-arm@nongnu.org" <qemu-arm@nongnu.org>
Cc: "maz@kernel.org" <maz@kernel.org>,
"jean-philippe@linaro.org" <jean-philippe@linaro.org>,
Jonathan Cameron <jonathan.cameron@huawei.com>,
"lpieralisi@kernel.org" <lpieralisi@kernel.org>,
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"richard.henderson@linaro.org" <richard.henderson@linaro.org>,
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zhukeqian <zhukeqian1@huawei.com>,
"wangxiongfeng (C)" <wangxiongfeng2@huawei.com>,
"wangyanan (Y)" <wangyanan55@huawei.com>,
"jiakernel2@gmail.com" <jiakernel2@gmail.com>,
"maobibo@loongson.cn" <maobibo@loongson.cn>,
"lixianglai@loongson.cn" <lixianglai@loongson.cn>
Subject: Re: [PATCH RFC V2 05/37] accel/kvm: Extract common KVM vCPU {creation,parking} code
Date: Tue, 3 Oct 2023 15:39:30 +1000 [thread overview]
Message-ID: <dafa4d84-4e23-6bb9-fa33-17861c28ee4a@redhat.com> (raw)
In-Reply-To: <2a1d9be1afb54290b6b0e4a54711e030@huawei.com>
Hi Salil,
On 10/3/23 02:20, Salil Mehta wrote:
>> From: Gavin Shan <gshan@redhat.com>
>> Sent: Wednesday, September 27, 2023 7:52 AM
>> To: Salil Mehta <salil.mehta@huawei.com>; qemu-devel@nongnu.org; qemu-
>> arm@nongnu.org
>> Cc: maz@kernel.org; jean-philippe@linaro.org; Jonathan Cameron
>> <jonathan.cameron@huawei.com>; lpieralisi@kernel.org;
>> peter.maydell@linaro.org; richard.henderson@linaro.org;
>> imammedo@redhat.com; andrew.jones@linux.dev; david@redhat.com;
>> philmd@linaro.org; eric.auger@redhat.com; will@kernel.org; ardb@kernel.org;
>> oliver.upton@linux.dev; pbonzini@redhat.com; mst@redhat.com;
>> rafael@kernel.org; borntraeger@linux.ibm.com; alex.bennee@linaro.org;
>> linux@armlinux.org.uk; darren@os.amperecomputing.com;
>> ilkka@os.amperecomputing.com; vishnu@os.amperecomputing.com;
>> karl.heubaum@oracle.com; miguel.luis@oracle.com; salil.mehta@opnsrc.net;
>> zhukeqian <zhukeqian1@huawei.com>; wangxiongfeng (C)
>> <wangxiongfeng2@huawei.com>; wangyanan (Y) <wangyanan55@huawei.com>;
>> jiakernel2@gmail.com; maobibo@loongson.cn; lixianglai@loongson.cn
>> Subject: Re: [PATCH RFC V2 05/37] accel/kvm: Extract common KVM vCPU
>> {creation,parking} code
>>
>> Hi Salil,
>>
>> On 9/26/23 20:04, Salil Mehta wrote:
>>> KVM vCPU creation is done once during the initialization of the VM when Qemu
>>> threads are spawned. This is common to all the architectures. If the architecture
>>> supports vCPU hot-{un}plug then this KVM vCPU creation could be deferred to
>>> later point as well. Some architectures might in any case create KVM vCPUs for
>>> the yet-to-be plugged vCPUs (i.e. QoM Object & thread does not exists) during VM
>>> init time and park them.
>>>
>>> Hot-unplug of vCPU results in destruction of the vCPU objects in QOM but
>>> the KVM vCPU objects in the Host KVM are not destroyed and their representative
>>> KVM vCPU objects in Qemu are parked.
>>>
>>> Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
>>> ---
>>> accel/kvm/kvm-all.c | 61 ++++++++++++++++++++++++++++++++++----------
>>> include/sysemu/kvm.h | 2 ++
>>> 2 files changed, 49 insertions(+), 14 deletions(-)
>>>
>>
>> The most important point seems missed in the commit log: The KVM vCPU objects,
>> including those hotpluggable objects, need to be in place before in-host GICv3
>> is initialized. So we need expose kvm_create_vcpu() to make those KVM vCPU
>> objects in place, even for those non-present vCPUs.
>
>
> This is a patch common to all architectures. The point you are making is specific
> to the ARM architecture. This patch is now part of the common patch-set. Here,
>
> https://lore.kernel.org/qemu-devel/20230930001933.2660-1-salil.mehta@huawei.com/
>
>
Yes, reviewed it again. Lets have more discussions over there.
Thanks,
Gavin
next prev parent reply other threads:[~2023-10-03 5:40 UTC|newest]
Thread overview: 146+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-26 10:03 [PATCH RFC V2 00/37] Support of Virtual CPU Hotplug for ARMv8 Arch Salil Mehta via
2023-09-26 10:04 ` [PATCH RFC V2 01/37] arm/virt, target/arm: Add new ARMCPU {socket, cluster, core, thread}-id property Salil Mehta via
2023-09-26 23:57 ` [PATCH RFC V2 01/37] arm/virt,target/arm: Add new ARMCPU {socket,cluster,core,thread}-id property Gavin Shan
2023-10-02 9:53 ` Salil Mehta via
2023-10-02 9:53 ` Salil Mehta
2023-10-03 5:05 ` Gavin Shan
2023-09-26 10:04 ` [PATCH RFC V2 02/37] cpus-common: Add common CPU utility for possible vCPUs Salil Mehta via
2023-09-27 3:54 ` Gavin Shan
2023-10-02 10:21 ` Salil Mehta via
2023-10-02 10:21 ` Salil Mehta
2023-10-03 5:34 ` Gavin Shan
2023-09-26 10:04 ` [PATCH RFC V2 03/37] hw/arm/virt: Move setting of common CPU properties in a function Salil Mehta via
2023-09-27 5:16 ` Gavin Shan
2023-10-02 10:24 ` Salil Mehta via
2023-10-02 10:24 ` Salil Mehta
2023-10-10 6:46 ` Shaoqin Huang
2023-10-10 9:47 ` Salil Mehta via
2023-10-10 9:47 ` Salil Mehta
2023-09-26 10:04 ` [PATCH RFC V2 04/37] arm/virt, target/arm: Machine init time change common to vCPU {cold|hot}-plug Salil Mehta via
2023-09-27 6:28 ` [PATCH RFC V2 04/37] arm/virt,target/arm: " Gavin Shan
2023-10-02 16:12 ` Salil Mehta via
2023-10-02 16:12 ` Salil Mehta
2024-01-16 15:59 ` Jonathan Cameron via
2023-09-27 6:30 ` Gavin Shan
2023-10-02 10:27 ` Salil Mehta via
2023-10-02 10:27 ` Salil Mehta
2023-09-26 10:04 ` [PATCH RFC V2 05/37] accel/kvm: Extract common KVM vCPU {creation, parking} code Salil Mehta via
2023-09-27 6:51 ` [PATCH RFC V2 05/37] accel/kvm: Extract common KVM vCPU {creation,parking} code Gavin Shan
2023-10-02 16:20 ` Salil Mehta via
2023-10-02 16:20 ` Salil Mehta
2023-10-03 5:39 ` Gavin Shan [this message]
2023-09-26 10:04 ` [PATCH RFC V2 06/37] arm/virt, kvm: Pre-create disabled possible vCPUs @machine init Salil Mehta via
2023-09-27 10:04 ` [PATCH RFC V2 06/37] arm/virt,kvm: " Gavin Shan
2023-10-02 16:39 ` Salil Mehta via
2023-10-02 16:39 ` Salil Mehta
2023-09-26 10:04 ` [PATCH RFC V2 07/37] arm/virt, gicv3: Changes to pre-size GIC with possible vcpus " Salil Mehta via
2023-09-28 0:14 ` Gavin Shan
2023-10-16 16:15 ` Salil Mehta via
2023-10-16 16:15 ` Salil Mehta
2023-09-26 10:04 ` [PATCH RFC V2 08/37] arm/virt: Init PMU at host for all possible vcpus Salil Mehta via
2023-09-26 10:04 ` [PATCH RFC V2 09/37] hw/acpi: Move CPU ctrl-dev MMIO region len macro to common header file Salil Mehta via
2023-09-28 0:19 ` Gavin Shan
2023-10-16 16:20 ` Salil Mehta via
2023-10-16 16:20 ` Salil Mehta
2023-09-26 10:04 ` [PATCH RFC V2 10/37] arm/acpi: Enable ACPI support for vcpu hotplug Salil Mehta via
2023-09-28 0:25 ` Gavin Shan
2023-10-16 21:23 ` Salil Mehta via
2023-10-16 21:23 ` Salil Mehta
2023-09-26 10:04 ` [PATCH RFC V2 11/37] hw/acpi: Add ACPI CPU hotplug init stub Salil Mehta via
2023-09-28 0:28 ` Gavin Shan
2023-10-16 21:27 ` Salil Mehta via
2023-10-16 21:27 ` Salil Mehta
2023-09-26 10:04 ` [PATCH RFC V2 12/37] hw/acpi: Use qemu_present_cpu() API in ACPI CPU hotplug init Salil Mehta via
2023-09-28 0:40 ` Gavin Shan
2023-10-16 21:41 ` Salil Mehta via
2023-10-16 21:41 ` Salil Mehta
2023-09-26 10:04 ` [PATCH RFC V2 13/37] hw/acpi: Init GED framework with cpu hotplug events Salil Mehta via
2023-09-28 0:56 ` Gavin Shan
2023-10-16 21:44 ` Salil Mehta via
2023-10-16 21:44 ` Salil Mehta
2023-09-26 10:04 ` [PATCH RFC V2 14/37] arm/virt: Add cpu hotplug events to GED during creation Salil Mehta via
2023-09-28 1:03 ` Gavin Shan
2023-10-16 21:46 ` Salil Mehta via
2023-10-16 21:46 ` Salil Mehta
2023-09-26 10:04 ` [PATCH RFC V2 15/37] arm/virt: Create GED dev before *disabled* CPU Objs are destroyed Salil Mehta via
2023-09-28 1:08 ` Gavin Shan
2023-10-16 21:54 ` Salil Mehta via
2023-10-16 21:54 ` Salil Mehta
2023-09-26 10:04 ` [PATCH RFC V2 16/37] hw/acpi: Update CPUs AML with cpu-(ctrl)dev change Salil Mehta via
2023-09-28 1:26 ` Gavin Shan
2023-10-16 21:57 ` Salil Mehta via
2023-10-16 21:57 ` Salil Mehta
2023-09-26 10:04 ` [PATCH RFC V2 17/37] arm/virt/acpi: Build CPUs AML with CPU Hotplug support Salil Mehta via
2023-09-28 1:36 ` Gavin Shan
2023-10-16 22:05 ` Salil Mehta via
2023-10-16 22:05 ` Salil Mehta
2023-09-26 10:04 ` [PATCH RFC V2 18/37] arm/virt: Make ARM vCPU *present* status ACPI *persistent* Salil Mehta via
2023-09-28 23:18 ` Gavin Shan
2023-10-16 22:33 ` Salil Mehta via
2023-10-16 22:33 ` Salil Mehta
2023-09-26 10:04 ` [PATCH RFC V2 19/37] hw/acpi: ACPI/AML Changes to reflect the correct _STA.{PRES, ENA} Bits to Guest Salil Mehta via
2023-09-28 23:33 ` [PATCH RFC V2 19/37] hw/acpi: ACPI/AML Changes to reflect the correct _STA.{PRES,ENA} " Gavin Shan
2023-10-16 22:59 ` Salil Mehta via
2023-10-16 22:59 ` Salil Mehta
2024-01-17 21:46 ` [PATCH RFC V2 19/37] hw/acpi: ACPI/AML Changes to reflect the correct _STA.{PRES, ENA} " Jonathan Cameron via
2023-09-26 10:04 ` [PATCH RFC V2 20/37] hw/acpi: Update GED _EVT method AML with cpu scan Salil Mehta via
2023-09-28 23:35 ` Gavin Shan
2023-10-16 23:01 ` Salil Mehta via
2023-10-16 23:01 ` Salil Mehta
2023-09-26 10:04 ` [PATCH RFC V2 21/37] hw/arm: MADT Tbl change to size the guest with possible vCPUs Salil Mehta via
2023-09-28 23:43 ` Gavin Shan
2023-10-16 23:15 ` Salil Mehta via
2023-10-16 23:15 ` Salil Mehta
2023-09-26 10:04 ` [PATCH RFC V2 22/37] hw/acpi: Make _MAT method optional Salil Mehta via
2023-09-28 23:50 ` Gavin Shan
2023-10-16 23:17 ` Salil Mehta via
2023-10-16 23:17 ` Salil Mehta
2023-09-26 10:04 ` [PATCH RFC V2 23/37] arm/virt: Release objects for *disabled* possible vCPUs after init Salil Mehta via
2023-09-28 23:57 ` Gavin Shan
2023-10-16 23:28 ` Salil Mehta via
2023-10-16 23:28 ` Salil Mehta
2023-09-26 10:04 ` [PATCH RFC V2 24/37] hw/acpi: Update ACPI GED framework to support vCPU Hotplug Salil Mehta via
2023-09-26 11:02 ` Michael S. Tsirkin
2023-09-26 11:37 ` Salil Mehta via
2023-09-26 12:00 ` Michael S. Tsirkin
2023-09-26 12:27 ` Salil Mehta via
2023-09-26 13:02 ` lixianglai
2023-09-26 10:04 ` [PATCH RFC V2 25/37] arm/virt: Add/update basic hot-(un)plug framework Salil Mehta via
2023-09-29 0:20 ` Gavin Shan
2023-10-16 23:40 ` Salil Mehta via
2023-10-16 23:40 ` Salil Mehta
2023-09-26 10:04 ` [PATCH RFC V2 26/37] arm/virt: Changes to (un)wire GICC<->vCPU IRQs during hot-(un)plug Salil Mehta via
2023-09-26 10:04 ` [PATCH RFC V2 27/37] hw/arm, gicv3: Changes to update GIC with vCPU hot-plug notification Salil Mehta via
2023-09-26 10:04 ` [PATCH RFC V2 28/37] hw/intc/arm-gicv3*: Changes required to (re)init the vCPU register info Salil Mehta via
2023-09-26 10:04 ` [PATCH RFC V2 29/37] arm/virt: Update the guest(via GED) about CPU hot-(un)plug events Salil Mehta via
2023-09-29 0:30 ` Gavin Shan
2023-10-16 23:48 ` Salil Mehta via
2023-10-16 23:48 ` Salil Mehta
2023-09-26 10:04 ` [PATCH RFC V2 30/37] hw/arm: Changes required for reset and to support next boot Salil Mehta via
2023-09-26 10:04 ` [PATCH RFC V2 31/37] physmem, gdbstub: Common helping funcs/changes to *unrealize* vCPU Salil Mehta via
2023-10-03 6:33 ` [PATCH RFC V2 31/37] physmem,gdbstub: " Philippe Mathieu-Daudé
2023-10-03 10:22 ` Salil Mehta via
2023-10-03 10:22 ` Salil Mehta
2023-10-04 9:17 ` Salil Mehta via
2023-10-04 9:17 ` Salil Mehta
2023-09-26 10:36 ` [PATCH RFC V2 32/37] target/arm: Add support of *unrealize* ARMCPU during vCPU Hot-unplug Salil Mehta via
2023-09-26 10:36 ` [PATCH RFC V2 33/37] target/arm/kvm: Write CPU state back to KVM on reset Salil Mehta via
2023-09-26 10:36 ` [PATCH RFC V2 34/37] target/arm/kvm, tcg: Register/Handle SMCCC hypercall exits to VMM/Qemu Salil Mehta via
2023-09-29 4:15 ` [PATCH RFC V2 34/37] target/arm/kvm,tcg: " Gavin Shan
2023-10-17 0:03 ` Salil Mehta via
2023-10-17 0:03 ` Salil Mehta
2023-09-26 10:36 ` [PATCH RFC V2 35/37] hw/arm: Support hotplug capability check using _OSC method Salil Mehta via
2023-09-29 4:23 ` Gavin Shan
2023-10-17 0:13 ` Salil Mehta via
2023-10-17 0:13 ` Salil Mehta
2023-09-26 10:36 ` [PATCH RFC V2 36/37] tcg/mttcg: enable threads to unregister in tcg_ctxs[] Salil Mehta via
2023-09-26 10:36 ` [PATCH RFC V2 37/37] hw/arm/virt: Expose cold-booted CPUs as MADT GICC Enabled Salil Mehta via
2023-10-11 10:23 ` [PATCH RFC V2 00/37] Support of Virtual CPU Hotplug for ARMv8 Arch Vishnu Pajjuri
2023-10-11 10:32 ` Salil Mehta via
2023-10-11 10:32 ` Salil Mehta
2023-10-11 11:08 ` Vishnu Pajjuri
2023-10-11 20:15 ` Salil Mehta
2023-10-12 17:02 ` Miguel Luis
2023-10-12 17:54 ` Salil Mehta via
2023-10-12 17:54 ` Salil Mehta
2023-10-13 10:43 ` Miguel Luis
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