From: Tamas K Lengyel <tamas.lengyel@intel.com>
To: xen-devel@lists.xenproject.org
Cc: "Tamas K Lengyel" <tamas.lengyel@intel.com>,
"Wei Liu" <wl@xen.org>,
"George Dunlap" <george.dunlap@eu.citrix.com>,
"Andrew Cooper" <andrew.cooper3@citrix.com>,
"Roger Pau Monné" <roger.pau@citrix.com>
Subject: [Xen-devel] [PATCH v5 03/18] x86/p2m: Allow p2m_get_page_from_gfn to return shared entries
Date: Tue, 21 Jan 2020 09:49:36 -0800 [thread overview]
Message-ID: <17ea032201adfecdb5dedc3a0b9667eccdf7f118.1579628566.git.tamas.lengyel@intel.com> (raw)
In-Reply-To: <cover.1579628566.git.tamas.lengyel@intel.com>
The owner domain of shared pages is dom_cow, use that for get_page
otherwise the function fails to return the correct page.
Signed-off-by: Tamas K Lengyel <tamas.lengyel@intel.com>
---
xen/arch/x86/mm/p2m.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/xen/arch/x86/mm/p2m.c b/xen/arch/x86/mm/p2m.c
index 3119269073..fdeb742707 100644
--- a/xen/arch/x86/mm/p2m.c
+++ b/xen/arch/x86/mm/p2m.c
@@ -594,7 +594,10 @@ struct page_info *p2m_get_page_from_gfn(
if ( p2m_is_ram(*t) && mfn_valid(mfn) )
{
page = mfn_to_page(mfn);
- if ( !get_page(page, p2m->domain) )
+ if ( !get_page(page, p2m->domain) &&
+ /* Page could be shared */
+ (!dom_cow || !p2m_is_shared(*t) ||
+ !get_page(page, dom_cow)) )
page = NULL;
}
put_gfn(p2m->domain, gfn_x(gfn));
--
2.20.1
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next prev parent reply other threads:[~2020-01-21 17:50 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-21 17:49 [Xen-devel] [PATCH v5 00/18] VM forking Tamas K Lengyel
2020-01-21 17:49 ` [Xen-devel] [PATCH v5 01/18] x86/hvm: introduce hvm_copy_context_and_params Tamas K Lengyel
2020-01-22 15:00 ` Jan Beulich
2020-01-22 16:42 ` Tamas K Lengyel
2020-01-21 17:49 ` [Xen-devel] [PATCH v5 02/18] xen/x86: Make hap_get_allocation accessible Tamas K Lengyel
2020-01-21 17:49 ` Tamas K Lengyel [this message]
2020-01-22 15:23 ` [Xen-devel] [PATCH v5 03/18] x86/p2m: Allow p2m_get_page_from_gfn to return shared entries Jan Beulich
2020-01-22 16:51 ` Tamas K Lengyel
2020-01-22 16:55 ` Jan Beulich
2020-01-23 15:32 ` George Dunlap
2020-01-23 15:48 ` Tamas K Lengyel
2020-01-21 17:49 ` [Xen-devel] [PATCH v5 04/18] x86/mem_sharing: make get_two_gfns take locks conditionally Tamas K Lengyel
2020-01-23 15:50 ` George Dunlap
2020-01-21 17:49 ` [Xen-devel] [PATCH v5 05/18] x86/mem_sharing: drop flags from mem_sharing_unshare_page Tamas K Lengyel
2020-01-23 15:53 ` George Dunlap
2020-01-21 17:49 ` [Xen-devel] [PATCH v5 06/18] x86/mem_sharing: don't try to unshare twice during page fault Tamas K Lengyel
2020-01-21 17:49 ` [Xen-devel] [PATCH v5 07/18] x86/mem_sharing: define mem_sharing_domain to hold some scattered variables Tamas K Lengyel
2020-01-23 15:59 ` George Dunlap
2020-01-21 17:49 ` [Xen-devel] [PATCH v5 08/18] x86/mem_sharing: Use INVALID_MFN and p2m_is_shared in relinquish_shared_pages Tamas K Lengyel
2020-01-21 17:49 ` [Xen-devel] [PATCH v5 09/18] x86/mem_sharing: Make add_to_physmap static and shorten name Tamas K Lengyel
2020-01-21 17:49 ` [Xen-devel] [PATCH v5 10/18] x86/mem_sharing: Convert MEM_SHARING_DESTROY_GFN to a bool Tamas K Lengyel
2020-01-23 16:14 ` George Dunlap
2020-01-23 16:23 ` Tamas K Lengyel
2020-01-23 16:32 ` George Dunlap
2020-01-23 16:37 ` Jan Beulich
2020-01-23 16:42 ` George Dunlap
2020-01-23 16:55 ` Jan Beulich
2020-01-21 17:49 ` [Xen-devel] [PATCH v5 11/18] x86/mem_sharing: Replace MEM_SHARING_DEBUG with gdprintk Tamas K Lengyel
2020-01-22 15:30 ` Jan Beulich
2020-01-22 16:55 ` Tamas K Lengyel
2020-01-21 17:49 ` [Xen-devel] [PATCH v5 12/18] x86/mem_sharing: Enable mem_sharing on first memop Tamas K Lengyel
2020-01-22 15:32 ` Jan Beulich
2020-01-21 17:49 ` [Xen-devel] [PATCH v5 13/18] x86/mem_sharing: Skip xen heap pages in memshr nominate Tamas K Lengyel
2020-01-21 17:49 ` [Xen-devel] [PATCH v5 14/18] x86/mem_sharing: use default_access in add_to_physmap Tamas K Lengyel
2020-01-22 15:35 ` Jan Beulich
2020-01-22 17:08 ` Tamas K Lengyel
2020-01-23 16:44 ` George Dunlap
2020-01-23 17:19 ` Tamas K Lengyel
2020-01-21 17:49 ` [Xen-devel] [PATCH v5 15/18] xen/mem_sharing: VM forking Tamas K Lengyel
2020-01-23 17:21 ` George Dunlap
2020-01-23 17:30 ` Tamas K Lengyel
2020-01-21 17:49 ` [Xen-devel] [PATCH v5 16/18] xen/mem_access: Use __get_gfn_type_access in set_mem_access Tamas K Lengyel
2020-01-21 17:49 ` [Xen-devel] [PATCH v5 17/18] x86/mem_sharing: reset a fork Tamas K Lengyel
2020-01-21 17:49 ` [Xen-devel] [PATCH v5 18/18] xen/tools: VM forking toolstack side Tamas K Lengyel
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