linux-kernel - Re: [PATCH v2 15/17] x86/hyperv: implement an MSI domain for root partition

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Message-ID: <20201112135051.gzd3pyqz2nyum655@liuwe-devbox-debian-v2>
Date:   Thu, 12 Nov 2020 13:50:51 +0000
From:   Wei Liu <wei.liu@...nel.org>
To:     Linux on Hyper-V List <linux-hyperv@...r.kernel.org>
Cc:     virtualization@...ts.linux-foundation.org,
        Linux Kernel List <linux-kernel@...r.kernel.org>,
        Michael Kelley <mikelley@...rosoft.com>,
        Vineeth Pillai <viremana@...ux.microsoft.com>,
        Sunil Muthuswamy <sunilmut@...rosoft.com>,
        Nuno Das Neves <nunodasneves@...ux.microsoft.com>,
        Wei Liu <wei.liu@...nel.org>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH v2 15/17] x86/hyperv: implement an MSI domain for root
 partition

On Thu, Nov 05, 2020 at 04:58:12PM +0000, Wei Liu wrote:
> When Linux runs as the root partition on Microsoft Hypervisor, its
> interrupts are remapped.  Linux will need to explicitly map and unmap
> interrupts for hardware.
> 
> Implement an MSI domain to issue the correct hypercalls. And initialize
> this irqdomain as the default MSI irq domain.
> 
> Signed-off-by: Sunil Muthuswamy <sunilmut@...rosoft.com>
> Co-Developed-by: Sunil Muthuswamy <sunilmut@...rosoft.com>
> Signed-off-by: Wei Liu <wei.liu@...nel.org>
> ---
> v2:
> This patch is simplified due to upstream changes.
> ---
>  arch/x86/hyperv/Makefile    |   2 +-
>  arch/x86/hyperv/hv_init.c   |  10 +-
>  arch/x86/hyperv/irqdomain.c | 330 ++++++++++++++++++++++++++++++++++++
>  3 files changed, 340 insertions(+), 2 deletions(-)
>  create mode 100644 arch/x86/hyperv/irqdomain.c
> 
> diff --git a/arch/x86/hyperv/Makefile b/arch/x86/hyperv/Makefile
> index 565358020921..2ebcf3969121 100644
> --- a/arch/x86/hyperv/Makefile
> +++ b/arch/x86/hyperv/Makefile
> @@ -1,6 +1,6 @@
>  # SPDX-License-Identifier: GPL-2.0-only
>  obj-y			:= hv_init.o mmu.o nested.o
> -obj-$(CONFIG_X86_64)	+= hv_apic.o hv_proc.o
> +obj-$(CONFIG_X86_64)	+= hv_apic.o hv_proc.o irqdomain.o

I need to move irqdomain.o to obj-y because 32bit build also needs it in
hv_init.o.

After this change, 32bit build of the kernel builds and works as expected.

Wei.