linux-kernel - Re: [PATCH v4 3/7] x86/jailhouse: Enable PCI mmconfig access in inmates

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Date:   Mon, 5 Mar 2018 17:36:48 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Jan Kiszka <jan.kiszka@...mens.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H . Peter Anvin" <hpa@...or.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>, x86@...nel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        jailhouse-dev@...glegroups.com, linux-pci@...r.kernel.org,
        virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v4 3/7] x86/jailhouse: Enable PCI mmconfig access in inmates

On Sun, Mar 4, 2018 at 8:31 PM, Jan Kiszka <jan.kiszka@...mens.com> wrote:
> From: Otavio Pontes <otavio.pontes@...el.com>
>
> Use the PCI mmconfig base address exported by jailhouse in boot
> parameters in order to access the memory mapped PCI configuration space.
>

FWIW,
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>

> Signed-off-by: Otavio Pontes <otavio.pontes@...el.com>
> [Jan: rebased, fixed !CONFIG_PCI_MMCONFIG, used pcibios_last_bus]
> Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>
> ---
>  arch/x86/include/asm/pci_x86.h | 2 ++
>  arch/x86/kernel/jailhouse.c    | 8 ++++++++
>  arch/x86/pci/mmconfig-shared.c | 4 ++--
>  3 files changed, 12 insertions(+), 2 deletions(-)
>
> diff --git a/arch/x86/include/asm/pci_x86.h b/arch/x86/include/asm/pci_x86.h
> index eb66fa9cd0fc..959d618dbb17 100644
> --- a/arch/x86/include/asm/pci_x86.h
> +++ b/arch/x86/include/asm/pci_x86.h
> @@ -151,6 +151,8 @@ extern int pci_mmconfig_insert(struct device *dev, u16 seg, u8 start, u8 end,
>                                phys_addr_t addr);
>  extern int pci_mmconfig_delete(u16 seg, u8 start, u8 end);
>  extern struct pci_mmcfg_region *pci_mmconfig_lookup(int segment, int bus);
> +extern struct pci_mmcfg_region *__init pci_mmconfig_add(int segment, int start,
> +                                                       int end, u64 addr);
>
>  extern struct list_head pci_mmcfg_list;
>
> diff --git a/arch/x86/kernel/jailhouse.c b/arch/x86/kernel/jailhouse.c
> index b68fd895235a..fa183a131edc 100644
> --- a/arch/x86/kernel/jailhouse.c
> +++ b/arch/x86/kernel/jailhouse.c
> @@ -124,6 +124,14 @@ static int __init jailhouse_pci_arch_init(void)
>         if (pcibios_last_bus < 0)
>                 pcibios_last_bus = 0xff;
>
> +#ifdef CONFIG_PCI_MMCONFIG
> +       if (setup_data.pci_mmconfig_base) {
> +               pci_mmconfig_add(0, 0, pcibios_last_bus,
> +                                setup_data.pci_mmconfig_base);
> +               pci_mmcfg_arch_init();
> +       }
> +#endif
> +
>         return 0;
>  }
>
> diff --git a/arch/x86/pci/mmconfig-shared.c b/arch/x86/pci/mmconfig-shared.c
> index 96684d0adcf9..0e590272366b 100644
> --- a/arch/x86/pci/mmconfig-shared.c
> +++ b/arch/x86/pci/mmconfig-shared.c
> @@ -94,8 +94,8 @@ static struct pci_mmcfg_region *pci_mmconfig_alloc(int segment, int start,
>         return new;
>  }
>
> -static struct pci_mmcfg_region *__init pci_mmconfig_add(int segment, int start,
> -                                                       int end, u64 addr)
> +struct pci_mmcfg_region *__init pci_mmconfig_add(int segment, int start,
> +                                                int end, u64 addr)
>  {
>         struct pci_mmcfg_region *new;
>
> --
> 2.13.6
>



-- 
With Best Regards,
Andy Shevchenko