linux-kernel - [PATCH v13 09/19] xen/pvh: Setup up shared

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Date:	Fri,  3 Jan 2014 14:38:26 -0500
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org,
	boris.ostrovsky@...cle.com, stefano.stabellini@...citrix.com,
	david.vrabel@...rix.com
Cc:	hpa@...or.com, Mukesh Rathor <mukesh.rathor@...cle.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: [PATCH v13 09/19] xen/pvh: Setup up shared_info.

From: Mukesh Rathor <mukesh.rathor@...cle.com>

For PVHVM the shared_info structure is provided via the same way
as for normal PV guests (see include/xen/interface/xen.h).

That is during bootup we get 'xen_start_info' via the %esi register
in startup_xen. Then later we extract the 'shared_info' from said
structure (in xen_setup_shared_info) and start using it.

The 'xen_setup_shared_info' is all setup to work with auto-xlat
guests, but there are two functions which it calls that are not:
xen_setup_mfn_list_list and xen_setup_vcpu_info_placement.
This patch modifies the P2M code (xen_setup_mfn_list_list)
while the "Piggyback on PVHVM for event channels" modifies
the xen_setup_vcpu_info_placement.

Signed-off-by: Mukesh Rathor <mukesh.rathor@...cle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
---
 arch/x86/xen/p2m.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/x86/xen/p2m.c b/arch/x86/xen/p2m.c
index fb7ee0a..696c694 100644
--- a/arch/x86/xen/p2m.c
+++ b/arch/x86/xen/p2m.c
@@ -339,6 +339,9 @@ void __ref xen_build_mfn_list_list(void)

 void xen_setup_mfn_list_list(void)
 {
+	if (xen_feature(XENFEAT_auto_translated_physmap))
+		return;
+
 	BUG_ON(HYPERVISOR_shared_info == &xen_dummy_shared_info);

 	HYPERVISOR_shared_info->arch.pfn_to_mfn_frame_list_list =
-- 
1.8.3.1

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