From: Hongyan Xia <hx242@xen.org>
To: xen-devel@lists.xenproject.org
Cc: jgrall@amazon.com, "Jan Beulich" <jbeulich@suse.com>,
"Andrew Cooper" <andrew.cooper3@citrix.com>,
"Roger Pau Monné" <roger.pau@citrix.com>, "Wei Liu" <wl@xen.org>
Subject: [PATCH v9 09/13] x86/smpboot: add exit path for clone_mapping()
Date: Tue, 6 Apr 2021 12:05:57 +0100 [thread overview]
Message-ID: <1277cb7cb71edbb03a13f9db8fe07810e68c7248.1617706782.git.hongyxia@amazon.com> (raw)
In-Reply-To: <cover.1617706782.git.hongyxia@amazon.com>
In-Reply-To: <cover.1617706782.git.hongyxia@amazon.com>
From: Wei Liu <wei.liu2@citrix.com>
We will soon need to clean up page table mappings in the exit path.
No functional change.
Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: Hongyan Xia <hongyxia@amazon.com>
---
Changed in v7:
- edit commit message.
- begin with rc = 0 and set it to -ENOMEM ahead of if().
---
xen/arch/x86/smpboot.c | 16 +++++++++++-----
1 file changed, 11 insertions(+), 5 deletions(-)
diff --git a/xen/arch/x86/smpboot.c b/xen/arch/x86/smpboot.c
index 82c1012e892f..e90c4dfa8a88 100644
--- a/xen/arch/x86/smpboot.c
+++ b/xen/arch/x86/smpboot.c
@@ -696,6 +696,7 @@ static int clone_mapping(const void *ptr, root_pgentry_t *rpt)
l3_pgentry_t *pl3e;
l2_pgentry_t *pl2e;
l1_pgentry_t *pl1e;
+ int rc = 0;
/*
* Sanity check 'linear'. We only allow cloning from the Xen virtual
@@ -736,7 +737,7 @@ static int clone_mapping(const void *ptr, root_pgentry_t *rpt)
pl1e = l2e_to_l1e(*pl2e) + l1_table_offset(linear);
flags = l1e_get_flags(*pl1e);
if ( !(flags & _PAGE_PRESENT) )
- return 0;
+ goto out;
pfn = l1e_get_pfn(*pl1e);
}
}
@@ -744,8 +745,9 @@ static int clone_mapping(const void *ptr, root_pgentry_t *rpt)
if ( !(root_get_flags(rpt[root_table_offset(linear)]) & _PAGE_PRESENT) )
{
pl3e = alloc_xen_pagetable();
+ rc = -ENOMEM;
if ( !pl3e )
- return -ENOMEM;
+ goto out;
clear_page(pl3e);
l4e_write(&rpt[root_table_offset(linear)],
l4e_from_paddr(__pa(pl3e), __PAGE_HYPERVISOR));
@@ -758,8 +760,9 @@ static int clone_mapping(const void *ptr, root_pgentry_t *rpt)
if ( !(l3e_get_flags(*pl3e) & _PAGE_PRESENT) )
{
pl2e = alloc_xen_pagetable();
+ rc = -ENOMEM;
if ( !pl2e )
- return -ENOMEM;
+ goto out;
clear_page(pl2e);
l3e_write(pl3e, l3e_from_paddr(__pa(pl2e), __PAGE_HYPERVISOR));
}
@@ -774,8 +777,9 @@ static int clone_mapping(const void *ptr, root_pgentry_t *rpt)
if ( !(l2e_get_flags(*pl2e) & _PAGE_PRESENT) )
{
pl1e = alloc_xen_pagetable();
+ rc = -ENOMEM;
if ( !pl1e )
- return -ENOMEM;
+ goto out;
clear_page(pl1e);
l2e_write(pl2e, l2e_from_paddr(__pa(pl1e), __PAGE_HYPERVISOR));
}
@@ -796,7 +800,9 @@ static int clone_mapping(const void *ptr, root_pgentry_t *rpt)
else
l1e_write(pl1e, l1e_from_pfn(pfn, flags));
- return 0;
+ rc = 0;
+ out:
+ return rc;
}
DEFINE_PER_CPU(root_pgentry_t *, root_pgt);
--
2.23.3
next prev parent reply other threads:[~2021-04-06 11:06 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-06 11:05 [PATCH v9 00/13] switch to domheap for Xen page tables Hongyan Xia
2021-04-06 11:05 ` [PATCH v9 01/13] x86/mm: rewrite virt_to_xen_l*e Hongyan Xia
2021-04-20 12:17 ` Jan Beulich
2021-04-21 11:33 ` Hongyan Xia
2021-04-21 11:39 ` Jan Beulich
2021-04-06 11:05 ` [PATCH v9 02/13] x86/mm: switch to new APIs in map_pages_to_xen Hongyan Xia
2021-04-06 11:05 ` [PATCH v9 03/13] x86/mm: switch to new APIs in modify_xen_mappings Hongyan Xia
2021-04-06 11:05 ` [PATCH v9 04/13] x86_64/mm: introduce pl2e in paging_init Hongyan Xia
2021-04-06 11:05 ` [PATCH v9 05/13] x86_64/mm: switch to new APIs " Hongyan Xia
2021-04-06 11:05 ` [PATCH v9 06/13] x86_64/mm: switch to new APIs in setup_m2p_table Hongyan Xia
2021-04-06 11:05 ` [PATCH v9 07/13] efi: use new page table APIs in copy_mapping Hongyan Xia
2021-04-06 11:05 ` [PATCH v9 08/13] efi: switch to new APIs in EFI code Hongyan Xia
2021-04-06 11:05 ` Hongyan Xia [this message]
2021-04-20 12:29 ` [PATCH v9 09/13] x86/smpboot: add exit path for clone_mapping() Jan Beulich
2021-04-06 11:05 ` [PATCH v9 10/13] x86/smpboot: switch clone_mapping() to new APIs Hongyan Xia
2021-04-20 12:32 ` Jan Beulich
2021-04-21 13:39 ` Hongyan Xia
2021-04-06 11:05 ` [PATCH v9 11/13] x86/mm: drop old page table APIs Hongyan Xia
2021-04-06 11:06 ` [PATCH v9 12/13] x86: switch to use domheap page for page tables Hongyan Xia
2021-04-06 11:06 ` [PATCH v9 13/13] x86/mm: drop _new suffix for page table APIs Hongyan Xia
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