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: <5be04d96-aa10-a022-2597-f7f40138f8f8@oracle.com>
Date:   Thu, 1 Mar 2018 10:02:35 -0500
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Maran Wilson <maran.wilson@...cle.com>, pbonzini@...hat.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 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?


-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