linux-kernel - Re: [RFC PATCH v4 1/7] xen/pvh: Split CONFIG_XEN_PVH into CONFIG_PVH and CONFIG_XEN

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Message-ID: <e8bbb473-fb06-aa33-75e1-dbb80dc1c5a2@oracle.com>
Date:   Thu, 1 Mar 2018 09:24:13 -0800
From:   Maran Wilson <maran.wilson@...cle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>, jgross@...e.com,
        roger.pau@...rix.com, andrew.cooper3@...rix.com, hch@...radead.org,
        JBeulich@...e.com, x86@...nel.org, xen-devel@...ts.xenproject.org,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
        rkrcmar@...hat.com, jpoimboe@...hat.com, bp@...e.de,
        kirill.shutemov@...ux.intel.com, thomas.lendacky@....com,
        luto@...nel.org, dave.hansen@...ux.intel.com, davem@...emloft.net,
        gregkh@...uxfoundation.org, mchehab@...nel.org,
        linus.walleij@...aro.org, rdunlap@...radead.org
Subject: Re: [RFC PATCH v4 1/7] xen/pvh: Split CONFIG_XEN_PVH into CONFIG_PVH
 and CONFIG_XEN_PVH

On 3/1/2018 7:17 AM, Paolo Bonzini wrote:
> On 01/03/2018 16:02, Boris Ostrovsky wrote:
>> On 02/28/2018 01:27 PM, Maran Wilson wrote:
>>> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
>>> index eb7f43f23521..fa7cd0305125 100644
>>> --- a/arch/x86/Kconfig
>>> +++ b/arch/x86/Kconfig
>>> @@ -791,6 +791,14 @@ 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"
>>> +	depends on KVM_GUEST || XEN
>>
>> Not sure about XEN part. PVH is selected by XEN_PVH for Xen.
>>
>> What about introducing KVM_GUEST_PVH that will select PVH and then drop
>> dependency here?
> That is, "config KVM_GUEST_PVH" "depends on KVM_GUEST" "select PVH".
> Sounds good to me.

OK, will do.

Thanks,
-Maran

> Paolo
>
>> -boris
>>
>>> +	def_bool n
>>> +	---help---
>>> +	  This option enables the PVH entry point for guest virtual machines
>>> +	  as specified in the x86/HVM direct boot ABI.
>>> +
>>>   
>>
>>> diff --git a/arch/x86/xen/Kconfig b/arch/x86/xen/Kconfig
>>> index f605825a04ab..021c8591c3c0 100644
>>> --- a/arch/x86/xen/Kconfig
>>> +++ b/arch/x86/xen/Kconfig
>>> @@ -77,8 +77,9 @@ config XEN_DEBUG_FS
>>>   	  Enabling this option may incur a significant performance overhead.
>>>   
>>>   config XEN_PVH
>>> -	bool "Support for running as a PVH guest"
>>> +	bool "Support for running as a Xen PVH guest"
>>>   	depends on XEN && XEN_PVHVM && ACPI
>>>   	# Pre-built page tables are not ready to handle 5-level paging.
>>>   	depends on !X86_5LEVEL
>>> +	select PVH
>>>   	def_bool n