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

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Date:   Thu, 1 Mar 2018 16:17:41 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Maran Wilson <maran.wilson@...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 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.

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
>