linux-kernel - Re: [PATCH v5 04/12] virt: geniezone: Add vcpu support

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Date:   Thu, 31 Aug 2023 06:54:48 +0000
From:   Yi-De Wu (吳一德) <Yi-De.Wu@...iatek.com>
To:     "robh@...nel.org" <robh@...nel.org>
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        MY Chuang (莊明躍) <MY.Chuang@...iatek.com>,
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        Ivan Tseng (曾志軒) 
        <ivan.tseng@...iatek.com>
Subject: Re: [PATCH v5 04/12] virt: geniezone: Add vcpu support

On Fri, 2023-08-11 at 11:00 -0600, Rob Herring wrote:
>  	 
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
>  On Thu, Jul 27, 2023 at 03:59:57PM +0800, Yi-De Wu wrote:
> > From: "Yingshiuan Pan" <yingshiuan.pan@...iatek.com>
> > 
> > VMM use this interface to create vcpu instance which is a fd, and
> this
> > fd will be for any vcpu operations, such as setting vcpu registers
> and
> > accepts the most important ioctl GZVM_VCPU_RUN which requests
> GenieZone
> > hypervisor to do context switch to execute VM's vcpu context.
> > 
> > Signed-off-by: Yingshiuan Pan <yingshiuan.pan@...iatek.com>
> > Signed-off-by: Jerry Wang <ze-yu.wang@...iatek.com>
> > Signed-off-by: Liju Chen <liju-clr.chen@...iatek.com>
> > Signed-off-by: Yi-De Wu <yi-de.wu@...iatek.com>
> > ---
> >  arch/arm64/geniezone/Makefile           |   2 +-
> >  arch/arm64/geniezone/gzvm_arch_common.h |  20 ++
> >  arch/arm64/geniezone/vcpu.c             |  88 +++++++++
> >  arch/arm64/geniezone/vm.c               |  11 ++
> >  arch/arm64/include/uapi/asm/gzvm_arch.h |  30 +++
> 
> I'm almost certain that the arm64 maintainers will reject putting
> this 
> here. What is the purpose of the split with drivers/virt/? Do you
> plan 
> to support another arch in the near future?
> 
> Yes, there's KVM stuff in arch/arm64, but that is multi-arch.
> 

hi Rob,

Thank you for the review, and the confirmation from Will was well
received. 

To be more specific, are you suggesting to 
- remove the `gzvm_arch.h`
from UAPI or 
- remove all the code under `arch/arm64/geniezone` to
somewhere like `drivers/virt/geniezone/arch`, or
- both? 

Regards,

> >  drivers/virt/geniezone/Makefile         |   3 +-
> >  drivers/virt/geniezone/gzvm_vcpu.c      | 250
> ++++++++++++++++++++++++
> >  drivers/virt/geniezone/gzvm_vm.c        |   5 +
> >  include/linux/gzvm_drv.h                |  21 ++
> >  include/uapi/linux/gzvm.h               | 136 +++++++++++++
> >  10 files changed, 564 insertions(+), 2 deletions(-)
> >  create mode 100644 arch/arm64/geniezone/vcpu.c
> >  create mode 100644 drivers/virt/geniezone/gzvm_vcpu.c