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Date:   Tue, 11 Dec 2018 14:22:34 +0100
From:   Borislav Petkov <bp@alien8.de>
To:     Maran Wilson <maran.wilson@oracle.com>
Cc:     x86@kernel.org, linux-kernel@vger.kernel.org,
        xen-devel@lists.xenproject.org, kvm@vger.kernel.org,
        pbonzini@redhat.com, jgross@suse.com, tglx@linutronix.de,
        mingo@redhat.com, hpa@zytor.com, boris.ostrovsky@oracle.com,
        jpoimboe@redhat.com, kirill.shutemov@linux.intel.com, bp@suse.de,
        thomas.lendacky@amd.com, luto@kernel.org,
        dave.hansen@linux.intel.com, roger.pau@citrix.com,
        rkrcmar@redhat.com, rdunlap@infradead.org
Subject: Re: [PATCH v9 1/7] xen/pvh: Split CONFIG_XEN_PVH into CONFIG_PVH and
 CONFIG_XEN_PVH
Message-ID: <20181211132234.GE27375@zn.tnic>
References: <1544468734-32763-1-git-send-email-maran.wilson@oracle.com>
 <1544468848-496-1-git-send-email-maran.wilson@oracle.com>
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On Mon, Dec 10, 2018 at 11:07:28AM -0800, Maran Wilson wrote:
> In order to pave the way for hypervisors other than Xen to use the PVH
> 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@oracle.com>
> Reviewed-by: Juergen Gross <jgross@suse.com>
> ---
>  arch/x86/Kconfig          | 6 ++++++
>  arch/x86/kernel/head_64.S | 2 +-
>  arch/x86/xen/Kconfig      | 3 ++-
>  3 files changed, 9 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index 8689e794a43c..c2a22a74abee 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -796,6 +796,12 @@ 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"
> +	---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
> diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S
> index 747c758f67b7..d1dbe8e4eb82 100644
> --- a/arch/x86/kernel/head_64.S
> +++ b/arch/x86/kernel/head_64.S
> @@ -386,7 +386,7 @@ NEXT_PAGE(early_dynamic_pgts)
>  
>  	.data
>  
> -#if defined(CONFIG_XEN_PV) || defined(CONFIG_XEN_PVH)
> +#if defined(CONFIG_XEN_PV) || defined(CONFIG_PVH)
>  NEXT_PGD_PAGE(init_top_pgt)
>  	.quad   level3_ident_pgt - __START_KERNEL_map + _KERNPG_TABLE_NOENC
>  	.org    init_top_pgt + L4_PAGE_OFFSET*8, 0
> diff --git a/arch/x86/xen/Kconfig b/arch/x86/xen/Kconfig
> index 1ef391aa184d..e07abefd3d26 100644
> --- a/arch/x86/xen/Kconfig
> +++ b/arch/x86/xen/Kconfig
> @@ -74,6 +74,7 @@ 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
> +	select PVH
>  	def_bool n
> -- 

LGTM:

Acked-by: Borislav Petkov <bp@suse.de>

-- 
Regards/Gruss,
    Boris.

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