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Subject: Re: [PATCH v8 1/7] xen/pvh: Split CONFIG_XEN_PVH into CONFIG_PVH and
 CONFIG_XEN_PVH
To:     Paolo Bonzini <pbonzini@redhat.com>,
        Maran Wilson <maran.wilson@oracle.com>, x86@kernel.org,
        linux-kernel@vger.kernel.org, xen-devel@lists.xenproject.org,
        kvm@vger.kernel.org, jgross@suse.com
Cc:     tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com,
        jpoimboe@redhat.com, kirill.shutemov@linux.intel.com, bp@suse.de,
        thomas.lendacky@amd.com, luto@kernel.org,
        dave.hansen@linux.intel.com, roger.pau@citrix.com,
        rkrcmar@redhat.com, rdunlap@infradead.org
References: <1544076152-21637-1-git-send-email-maran.wilson@oracle.com>
 <1544076257-21792-1-git-send-email-maran.wilson@oracle.com>
 <d532f023-85f9-62b9-ca56-53a619fdcd1e@redhat.com>
From:   Boris Ostrovsky <boris.ostrovsky@oracle.com>
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Message-ID: <3b4fdddd-67d8-30d3-2a5d-c4d07b6f31c9@oracle.com>
Date:   Thu, 6 Dec 2018 17:34:46 -0500
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Sender: linux-kernel-owner@vger.kernel.org
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On 12/6/18 5:11 PM, Paolo Bonzini wrote:
> On 06/12/18 07:04, Maran Wilson wrote:
>> +config PVH
>> +	bool "Support for running PVH guests"
>> +	---help---
>> +	  This option enables the PVH entry point for guest virtual machines
>> +	  as specified in the x86/HVM direct boot ABI.
>> +
> IIUC this breaks "normal" bzImage boot, so we should have something like
>
> 	The resulting kernel will not boot with most x86 boot loaders
> 	such as GRUB 


Grub support for PVH guests (for Xen) is well under way.


> or SYSLINUX.  Unless you plan to start the kernel
> 	using QEMU or Xen, you probably want to say N here.

I think PVH should not be user-selectable at all. It should be selected
by either XEN_PVH or KVM_GUEST_PVH (which you suggested to drop).

>
> and also
>
> 	depends on !EFI
>
> because even though in principle it would be possible to write a PVH
> loader for UEFI, PVH's start info does not support the EFI handover
> protocol.

But we should be able to build the binary with both EFI and PVH?

-boris