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 12:23:30 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Maran Wilson <maran.wilson@...cle.com>, 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

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


-- 
~Randy