| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Fri, 28 Mar 2008 16:38:15 +0000
From: Mark McLoughlin <markmc@...hat.com>
To: jeremy@...p.org
Cc: linux-kernel@...r.kernel.org, mingo@...e.hu,
xen-devel@...ts.xensource.com, Mark McLoughlin <markmc@...hat.com>
Subject: [PATCH 1/3] xen: Refactor xen_{alloc,release}_{pte,pmd}()
Use the pt_level enum with generic alloc_ptpage()
and release_ptpage() functions to make it a little
more clear what's going on in next commit.
Signed-off-by: Mark McLoughlin <markmc@...hat.com>
---
arch/x86/xen/enlighten.c | 27 ++++++++++++++++++++-------
arch/x86/xen/mmu.c | 7 -------
arch/x86/xen/mmu.h | 7 +++++++
3 files changed, 27 insertions(+), 14 deletions(-)
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 1e5ea9e..a6a1b40 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -669,10 +669,10 @@ static void xen_release_pte_init(u32 pfn)
make_lowmem_page_readwrite(__va(PFN_PHYS(pfn)));
}
-static void pin_pagetable_pfn(unsigned level, unsigned long pfn)
+static void pin_pagetable_pfn(unsigned cmd, unsigned long pfn)
{
struct mmuext_op op;
- op.cmd = level;
+ op.cmd = cmd;
op.arg1.mfn = pfn_to_mfn(pfn);
if (HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF))
BUG();
@@ -689,7 +689,10 @@ static void xen_alloc_ptpage(struct mm_struct *mm, u32 pfn, unsigned level)
if (!PageHighMem(page)) {
make_lowmem_page_readonly(__va(PFN_PHYS(pfn)));
- pin_pagetable_pfn(level, pfn);
+ if (level == PT_PTE)
+ pin_pagetable_pfn(MMUEXT_PIN_L1_TABLE, pfn);
+ else if (level == PT_PMD)
+ pin_pagetable_pfn(MMUEXT_PIN_L2_TABLE, pfn);
} else
/* make sure there are no stray mappings of
this page */
@@ -699,16 +702,16 @@ static void xen_alloc_ptpage(struct mm_struct *mm, u32 pfn, unsigned level)
static void xen_alloc_pte(struct mm_struct *mm, u32 pfn)
{
- xen_alloc_ptpage(mm, pfn, MMUEXT_PIN_L1_TABLE);
+ xen_alloc_ptpage(mm, pfn, PT_PTE);
}
static void xen_alloc_pmd(struct mm_struct *mm, u32 pfn)
{
- xen_alloc_ptpage(mm, pfn, MMUEXT_PIN_L2_TABLE);
+ xen_alloc_ptpage(mm, pfn, PT_PMD);
}
/* This should never happen until we're OK to use struct page */
-static void xen_release_pte(u32 pfn)
+static void xen_release_ptpage(u32 pfn, unsigned level)
{
struct page *page = pfn_to_page(pfn);
@@ -720,6 +723,16 @@ static void xen_release_pte(u32 pfn)
}
}
+static void xen_release_pte(u32 pfn)
+{
+ xen_release_ptpage(pfn, PT_PTE);
+}
+
+static void xen_release_pmd(u32 pfn)
+{
+ xen_release_ptpage(pfn, PT_PMD);
+}
+
#ifdef CONFIG_HIGHPTE
static void *xen_kmap_atomic_pte(struct page *page, enum km_type type)
{
@@ -840,7 +853,7 @@ static __init void xen_pagetable_setup_done(pgd_t *base)
pv_mmu_ops.alloc_pte = xen_alloc_pte;
pv_mmu_ops.alloc_pmd = xen_alloc_pmd;
pv_mmu_ops.release_pte = xen_release_pte;
- pv_mmu_ops.release_pmd = xen_release_pte;
+ pv_mmu_ops.release_pmd = xen_release_pmd;
pv_mmu_ops.set_pte = xen_set_pte;
setup_shared_info();
diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index f5bb0be..272635a 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -271,13 +271,6 @@ void xen_set_pte(pte_t *ptep, pte_t pte)
}
#endif /* CONFIG_X86_PAE */
-enum pt_level {
- PT_PGD,
- PT_PUD,
- PT_PMD,
- PT_PTE
-};
-
/*
(Yet another) pagetable walker. This one is intended for pinning a
pagetable. This means that it walks a pagetable and calls the
diff --git a/arch/x86/xen/mmu.h b/arch/x86/xen/mmu.h
index c9ff27f..b5e189b 100644
--- a/arch/x86/xen/mmu.h
+++ b/arch/x86/xen/mmu.h
@@ -3,6 +3,13 @@
#include <linux/linkage.h>
#include <asm/page.h>
+enum pt_level {
+ PT_PGD,
+ PT_PUD,
+ PT_PMD,
+ PT_PTE
+};
+
/*
* Page-directory addresses above 4GB do not fit into architectural %cr3.
* When accessing %cr3, or equivalent field in vcpu_guest_context, guests
--
1.5.4.1
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists