linux-kernel - [PATCH 2/2] xen: Kconfig: nest Xen guest options

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Date:   Wed, 14 Oct 2020 13:53:41 -0400
From:   Jason Andryuk <jandryuk@...il.com>
To:     Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        Stefano Stabellini <sstabellini@...nel.org>
Cc:     Jason Andryuk <jandryuk@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] xen: Kconfig: nest Xen guest options

Moving XEN_512GB allows it to nest under XEN_PV.  That also allows
XEN_PVH to nest under XEN as a sibling to XEN_PV and XEN_PVHVM giving:

[*]   Xen guest support
[*]     Xen PV guest support
[*]       Limit Xen pv-domain memory to 512GB
[*]       Xen PV Dom0 support
[*]     Xen PVHVM guest support
[*]     Xen PVH guest support

Signed-off-by: Jason Andryuk <jandryuk@...il.com>
---
 arch/x86/xen/Kconfig | 26 +++++++++++++-------------
 1 file changed, 13 insertions(+), 13 deletions(-)

diff --git a/arch/x86/xen/Kconfig b/arch/x86/xen/Kconfig
index b75007eb4ec4..2b105888927c 100644
--- a/arch/x86/xen/Kconfig
+++ b/arch/x86/xen/Kconfig
@@ -26,6 +26,19 @@ config XEN_PV
 	help
 	  Support running as a Xen PV guest.
 
+config XEN_512GB
+	bool "Limit Xen pv-domain memory to 512GB"
+	depends on XEN_PV && X86_64
+	default y
+	help
+	  Limit paravirtualized user domains to 512GB of RAM.
+
+	  The Xen tools and crash dump analysis tools might not support
+	  pv-domains with more than 512 GB of RAM. This option controls the
+	  default setting of the kernel to use only up to 512 GB or more.
+	  It is always possible to change the default via specifying the
+	  boot parameter "xen_512gb_limit".
+
 config XEN_PV_SMP
 	def_bool y
 	depends on XEN_PV && SMP
@@ -53,19 +66,6 @@ config XEN_PVHVM_GUEST
 	help
 	  Support running as a Xen PVHVM guest.
 
-config XEN_512GB
-	bool "Limit Xen pv-domain memory to 512GB"
-	depends on XEN_PV
-	default y
-	help
-	  Limit paravirtualized user domains to 512GB of RAM.
-
-	  The Xen tools and crash dump analysis tools might not support
-	  pv-domains with more than 512 GB of RAM. This option controls the
-	  default setting of the kernel to use only up to 512 GB or more.
-	  It is always possible to change the default via specifying the
-	  boot parameter "xen_512gb_limit".
-
 config XEN_SAVE_RESTORE
 	bool
 	depends on XEN
-- 
2.26.2