From: Hongyan Xia <hx242@xen.org>
To: xen-devel@lists.xenproject.org
Cc: "Andrew Cooper" <andrew.cooper3@citrix.com>,
"Wei Liu" <wl@xen.org>, "Jan Beulich" <jbeulich@suse.com>,
"Roger Pau Monné" <roger.pau@citrix.com>
Subject: [Xen-devel] [PATCH 2/5] x86_64/mm: map and unmap page tables in m2p_mapped
Date: Mon, 23 Mar 2020 09:41:39 +0000 [thread overview]
Message-ID: <9b46a0bae03107fcb192e6590234b9e882965f11.1584955616.git.hongyxia@amazon.com> (raw)
In-Reply-To: <cover.1584955616.git.hongyxia@amazon.com>
In-Reply-To: <cover.1584955616.git.hongyxia@amazon.com>
From: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Reviewed-by: Hongyan Xia <hongyxia@amazon.com>
---
xen/arch/x86/x86_64/mm.c | 18 ++++++++++++------
1 file changed, 12 insertions(+), 6 deletions(-)
diff --git a/xen/arch/x86/x86_64/mm.c b/xen/arch/x86/x86_64/mm.c
index b7ce833ffc..a440dac25e 100644
--- a/xen/arch/x86/x86_64/mm.c
+++ b/xen/arch/x86/x86_64/mm.c
@@ -131,27 +131,33 @@ static int m2p_mapped(unsigned long spfn)
unsigned long va;
l3_pgentry_t *l3_ro_mpt;
l2_pgentry_t *l2_ro_mpt;
+ int rc = M2P_NO_MAPPED;
va = RO_MPT_VIRT_START + spfn * sizeof(*machine_to_phys_mapping);
- l3_ro_mpt = l4e_to_l3e(idle_pg_table[l4_table_offset(va)]);
+ l3_ro_mpt = map_l3t_from_l4e(idle_pg_table[l4_table_offset(va)]);
switch ( l3e_get_flags(l3_ro_mpt[l3_table_offset(va)]) &
(_PAGE_PRESENT |_PAGE_PSE))
{
case _PAGE_PSE|_PAGE_PRESENT:
- return M2P_1G_MAPPED;
+ rc = M2P_1G_MAPPED;
+ goto out;
/* Check for next level */
case _PAGE_PRESENT:
break;
default:
- return M2P_NO_MAPPED;
+ rc = M2P_NO_MAPPED;
+ goto out;
}
- l2_ro_mpt = l3e_to_l2e(l3_ro_mpt[l3_table_offset(va)]);
+ l2_ro_mpt = map_l2t_from_l3e(l3_ro_mpt[l3_table_offset(va)]);
if (l2e_get_flags(l2_ro_mpt[l2_table_offset(va)]) & _PAGE_PRESENT)
- return M2P_2M_MAPPED;
+ rc = M2P_2M_MAPPED;
+ UNMAP_DOMAIN_PAGE(l2_ro_mpt);
- return M2P_NO_MAPPED;
+ out:
+ UNMAP_DOMAIN_PAGE(l3_ro_mpt);
+ return rc;
}
static int share_hotadd_m2p_table(struct mem_hotadd_info *info)
--
2.24.1.AMZN
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next prev parent reply other threads:[~2020-03-23 9:42 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-23 9:41 [Xen-devel] [PATCH 0/5] use new API for Xen page tables Hongyan Xia
2020-03-23 9:41 ` [Xen-devel] [PATCH 1/5] x86/shim: map and unmap page tables in replace_va_mapping Hongyan Xia
2020-04-01 12:11 ` Jan Beulich
2020-03-23 9:41 ` Hongyan Xia [this message]
2020-04-01 12:19 ` [PATCH 2/5] x86_64/mm: map and unmap page tables in m2p_mapped Jan Beulich
2020-03-23 9:41 ` [Xen-devel] [PATCH 3/5] x86_64/mm: map and unmap page tables in share_hotadd_m2p_table Hongyan Xia
2020-04-01 12:29 ` Jan Beulich
2020-04-07 15:11 ` Hongyan Xia
2020-04-07 15:14 ` Jan Beulich
2020-04-08 9:32 ` Hongyan Xia
2020-03-23 9:41 ` [Xen-devel] [PATCH 4/5] x86_64/mm: map and unmap page tables in destroy_compat_m2p_mapping Hongyan Xia
2020-03-23 9:41 ` [Xen-devel] [PATCH 5/5] x86_64/mm: map and unmap page tables in destroy_m2p_mapping Hongyan Xia
2020-04-01 12:40 ` Jan Beulich
2020-04-07 16:23 ` Hongyan Xia
2020-03-29 15:06 ` [Xen-devel] [PATCH 0/5] use new API for Xen page tables Wei Liu
2020-03-30 8:25 ` Hongyan Xia
2020-04-06 8:27 ` Hongyan Xia
2020-04-06 11:03 ` Jan Beulich
2020-04-07 14:28 ` Hongyan Xia
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