linux-kernel - Re: [PATCH 0/3] x86/xen: support booting PVH guest via standard boot path

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Date:   Wed, 8 Nov 2017 08:37:47 -0500
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Juergen Gross <jgross@...e.com>, linux-kernel@...r.kernel.org,
        x86@...nel.org, kvm@...r.kernel.org, xen-devel@...ts.xenproject.org
Cc:     tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
        pbonzini@...hat.com, rkrcmar@...hat.com, rjw@...ysocki.net,
        len.brown@...el.com, pavel@....cz
Subject: Re: [PATCH 0/3] x86/xen: support booting PVH guest via standard boot
 path

On 11/08/2017 04:07 AM, Juergen Gross wrote:
> Booting a Xen PVH guest requires a special boot entry as it is
> mandatory to setup some Xen-specific interfaces rather early. When grub
> or OVMF are used as boot loaders, however, those will fill the boot
> parameters in zeropage and there is no longer a need to do something
> PVH specific in the early boot path.
>
> This patch series adds support for that scenario by identifying PVH
> environment and doing the required init steps via Xen hooks instead of
> using a dedicated boot entry.
>
> The dedicated entry is still needed for support of Dom0 running in PVH
> mode as in this case there is no grub or OVMF involved for filling in
> the boot parameters.

We are going to continue supporting direct boot of unprivileged guests
too so this entry point will be needed not for dom0 only.

-boris

>
> Juergen Gross (3):
>   x86/acpi: add test for ACPI_FADT_NO_VGA
>   x86: add guest_late_init hook to hypervisor_x86 structure
>   x86/xen: use guest_late_init to detect Xen PVH guest
>
>  arch/x86/include/asm/hypervisor.h | 11 +++++++++++
>  arch/x86/include/asm/kvm_para.h   |  2 --
>  arch/x86/include/asm/x86_init.h   |  1 +
>  arch/x86/kernel/acpi/boot.c       |  5 +++++
>  arch/x86/kernel/kvm.c             |  3 ++-
>  arch/x86/kernel/setup.c           |  2 +-
>  arch/x86/xen/enlighten_hvm.c      | 24 ++++++++++++++++++++++--
>  arch/x86/xen/enlighten_pvh.c      |  9 ---------
>  8 files changed, 42 insertions(+), 15 deletions(-)
>