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

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Message-Id: <20171108090739.26491-1-jgross@suse.com>
Date:   Wed,  8 Nov 2017 10:07:36 +0100
From:   Juergen Gross <jgross@...e.com>
To:     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,
        boris.ostrovsky@...cle.com, pbonzini@...hat.com,
        rkrcmar@...hat.com, rjw@...ysocki.net, len.brown@...el.com,
        pavel@....cz, Juergen Gross <jgross@...e.com>
Subject: [PATCH 0/3] x86/xen: support booting PVH guest via standard boot path

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.

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(-)

-- 
2.12.3