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 05/13] x86_64/mm: switch to new APIs in paging_init
Date: Tue, 6 Apr 2021 12:05:53 +0100 [thread overview]
Message-ID: <fd5ce586f12ed2aec08004a4b7216fc631c3d7dc.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>
Map and unmap pages instead of relying on the direct map.
Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: Hongyan Xia <hongyxia@amazon.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
---
Changed in v9:
- remove an unnecessary l3mfn variable.
Changed in v8:
- replace l3/2_ro_mpt_mfn with just mfn since their lifetimes do not
overlap
Changed in v7:
- use the new alloc_map_clear_xen_pt() helper.
- move the unmap of pl3t up a bit.
- remove the unmaps in the nomem path.
---
xen/arch/x86/x86_64/mm.c | 34 ++++++++++++++++++++--------------
1 file changed, 20 insertions(+), 14 deletions(-)
diff --git a/xen/arch/x86/x86_64/mm.c b/xen/arch/x86/x86_64/mm.c
index c5a47df01bde..da239f097703 100644
--- a/xen/arch/x86/x86_64/mm.c
+++ b/xen/arch/x86/x86_64/mm.c
@@ -498,6 +498,7 @@ void __init paging_init(void)
l3_pgentry_t *l3_ro_mpt;
l2_pgentry_t *pl2e = NULL, *l2_ro_mpt = NULL;
struct page_info *l1_pg;
+ mfn_t mfn;
/*
* We setup the L3s for 1:1 mapping if host support memory hotplug
@@ -510,22 +511,22 @@ void __init paging_init(void)
if ( !(l4e_get_flags(idle_pg_table[l4_table_offset(va)]) &
_PAGE_PRESENT) )
{
- l3_pgentry_t *pl3t = alloc_xen_pagetable();
+ l3_pgentry_t *pl3t = alloc_map_clear_xen_pt(&mfn);
if ( !pl3t )
goto nomem;
- clear_page(pl3t);
+ UNMAP_DOMAIN_PAGE(pl3t);
l4e_write(&idle_pg_table[l4_table_offset(va)],
- l4e_from_paddr(__pa(pl3t), __PAGE_HYPERVISOR_RW));
+ l4e_from_mfn(mfn, __PAGE_HYPERVISOR_RW));
}
}
/* Create user-accessible L2 directory to map the MPT for guests. */
- if ( (l3_ro_mpt = alloc_xen_pagetable()) == NULL )
+ l3_ro_mpt = alloc_map_clear_xen_pt(&mfn);
+ if ( !l3_ro_mpt )
goto nomem;
- clear_page(l3_ro_mpt);
l4e_write(&idle_pg_table[l4_table_offset(RO_MPT_VIRT_START)],
- l4e_from_paddr(__pa(l3_ro_mpt), __PAGE_HYPERVISOR_RO | _PAGE_USER));
+ l4e_from_mfn(mfn, __PAGE_HYPERVISOR_RO | _PAGE_USER));
/*
* Allocate and map the machine-to-phys table.
@@ -608,12 +609,14 @@ void __init paging_init(void)
}
if ( !((unsigned long)pl2e & ~PAGE_MASK) )
{
- if ( (l2_ro_mpt = alloc_xen_pagetable()) == NULL )
+ UNMAP_DOMAIN_PAGE(l2_ro_mpt);
+
+ l2_ro_mpt = alloc_map_clear_xen_pt(&mfn);
+ if ( !l2_ro_mpt )
goto nomem;
- clear_page(l2_ro_mpt);
+
l3e_write(&l3_ro_mpt[l3_table_offset(va)],
- l3e_from_paddr(__pa(l2_ro_mpt),
- __PAGE_HYPERVISOR_RO | _PAGE_USER));
+ l3e_from_mfn(mfn, __PAGE_HYPERVISOR_RO | _PAGE_USER));
pl2e = l2_ro_mpt;
ASSERT(!l2_table_offset(va));
}
@@ -625,15 +628,18 @@ void __init paging_init(void)
}
#undef CNT
#undef MFN
+ UNMAP_DOMAIN_PAGE(l2_ro_mpt);
+ UNMAP_DOMAIN_PAGE(l3_ro_mpt);
/* Create user-accessible L2 directory to map the MPT for compat guests. */
if ( opt_pv32 )
{
- if ( (l2_ro_mpt = alloc_xen_pagetable()) == NULL )
+ mfn = alloc_xen_pagetable_new();
+ if ( mfn_eq(mfn, INVALID_MFN) )
goto nomem;
- compat_idle_pg_table_l2 = l2_ro_mpt;
- clear_page(l2_ro_mpt);
- pl2e = l2_ro_mpt;
+ compat_idle_pg_table_l2 = map_domain_page_global(mfn);
+ clear_page(compat_idle_pg_table_l2);
+ pl2e = compat_idle_pg_table_l2;
/* Allocate and map the compatibility mode machine-to-phys table. */
mpt_size = (mpt_size >> 1) + (1UL << (L2_PAGETABLE_SHIFT - 1));
--
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 ` Hongyan Xia [this message]
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 ` [PATCH v9 09/13] x86/smpboot: add exit path for clone_mapping() Hongyan Xia
2021-04-20 12:29 ` 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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