linux-kernel - Re: [PATCH v5 1/7] xen/pvh: Split CONFIG_XEN_PVH into CONFIG_PVH and CONFIG_XEN

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Date:   Tue, 20 Mar 2018 13:55:31 -0700
From:   Maran Wilson <maran.wilson@...cle.com>
To:     Randy Dunlap <rdunlap@...radead.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org,
        kvm@...r.kernel.org, pbonzini@...hat.com, jgross@...e.com
Cc:     tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
        boris.ostrovsky@...cle.com, jpoimboe@...hat.com,
        kirill.shutemov@...ux.intel.com, bp@...e.de,
        thomas.lendacky@....com, luto@...nel.org,
        dave.hansen@...ux.intel.com, roger.pau@...rix.com,
        rkrcmar@...hat.com
Subject: Re: [PATCH v5 1/7] xen/pvh: Split CONFIG_XEN_PVH into CONFIG_PVH and
 CONFIG_XEN_PVH

On 3/20/2018 12:23 PM, Randy Dunlap wrote:
> Hi,
>
> On 03/20/2018 12:18 PM, Maran Wilson wrote:
>> In order to pave the way for hypervisors other then Xen to use the PVH
>                                                   than
>
>> entry point for VMs, we need to factor the PVH entry code into Xen specific
>> and hypervisor agnostic components. The first step in doing that, is to
>> create a new config option for PVH entry that can be enabled
>> independently from CONFIG_XEN.
>>
>> Signed-off-by: Maran Wilson <maran.wilson@...cle.com>
>> ---
>>   arch/x86/Kconfig          | 7 +++++++
>>   arch/x86/kernel/head_64.S | 4 ++--
>>   arch/x86/xen/Kconfig      | 3 ++-
>>   3 files changed, 11 insertions(+), 3 deletions(-)
>>
>> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
>> index eb7f43f23521..58831320b5d2 100644
>> --- a/arch/x86/Kconfig
>> +++ b/arch/x86/Kconfig
>> @@ -791,6 +791,13 @@ config KVM_GUEST
>>   	  underlying device model, the host provides the guest with
>>   	  timing infrastructure such as time of day, and system time
>>   
>> +config PVH
>> +	bool "Support for running PVH guests"
>> +	def_bool n
> You don't need two (2) "bool"s here. And 'n' is already the default, so just
> drop the second line.
>
>> +	---help---
>> +	  This option enables the PVH entry point for guest virtual machines
>> +	  as specified in the x86/HVM direct boot ABI.
>> +
>>   config KVM_DEBUG_FS
>>   	bool "Enable debug information for KVM Guests in debugfs"
>>   	depends on KVM_GUEST && DEBUG_FS
>

Hi Randy,

Will make both changes.

Thanks,
-Maran