[Xen-devel] [PATCH v3 3/6] x86 / pv: do not treat PGC_extra pages as RAM when constructing dom0

From: <pdurrant@amzn.com>
To: <xen-devel@lists.xenproject.org>
Cc: "Andrew Cooper" <andrew.cooper3@citrix.com>,
	"Paul Durrant" <pdurrant@amazon.com>, "Wei Liu" <wl@xen.org>,
	"Jan Beulich" <jbeulich@suse.com>,
	"Roger Pau Monné" <roger.pau@citrix.com>
Subject: [Xen-devel] [PATCH v3 3/6] x86 / pv: do not treat PGC_extra pages as RAM when constructing dom0
Date: Thu, 5 Mar 2020 12:45:01 +0000	[thread overview]
Message-ID: <20200305124504.3564-4-pdurrant@amzn.com> (raw)
In-Reply-To: <20200305124504.3564-1-pdurrant@amzn.com>

From: Paul Durrant <pdurrant@amazon.com>

The walk of page_list in dom0_construct_pv() should ignore PGC_extra pages
as they are only created for special purposes and, if mapped, will be mapped
explicitly for whatever purpose is relevant.

Signed-off-by: Paul Durrant <pdurrant@amazon.com>
---
Cc: Jan Beulich <jbeulich@suse.com>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: Wei Liu <wl@xen.org>
Cc: "Roger Pau Monné" <roger.pau@citrix.com>

v2:
 - New in v2
---
 xen/arch/x86/pv/dom0_build.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/xen/arch/x86/pv/dom0_build.c b/xen/arch/x86/pv/dom0_build.c
index dc16ef2e79..f8f1bbe2f4 100644
--- a/xen/arch/x86/pv/dom0_build.c
+++ b/xen/arch/x86/pv/dom0_build.c
@@ -792,6 +792,10 @@ int __init dom0_construct_pv(struct domain *d,
     {
         mfn = mfn_x(page_to_mfn(page));
         BUG_ON(SHARED_M2P(get_gpfn_from_mfn(mfn)));
+
+        if ( page->count_info & PGC_extra )
+            continue;
+
         if ( get_gpfn_from_mfn(mfn) >= count )
         {
             BUG_ON(is_pv_32bit_domain(d));
-- 
2.20.1


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