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From db1d801aa8dcb918a27486a6e8d9cf5d7307dec3 Mon Sep 17 00:00:00 2001
From: George Dunlap <george.dunlap@citrix.com>
Date: Thu, 10 Oct 2019 17:57:49 +0100
Subject: [PATCH 04/11] x86/mm: Use flags for _put_page_type rather than a
boolean
This is in mainly in preparation for _put_page_type taking the
partial_flags value in the future. It also makes it easier to read in
the caller (since you see a flag name rather than `true` or `false`).
No functional change intended.
This is part of XSA-299.
Reported-by: George Dunlap <george.dunlap@citrix.com>
Signed-off-by: George Dunlap <george.dunlap@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
---
xen/arch/x86/mm.c | 25 +++++++++++++------------
1 file changed, 13 insertions(+), 12 deletions(-)
diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c
index 3f6f8cc9b8..0740b61af8 100644
--- a/xen/arch/x86/mm.c
+++ b/xen/arch/x86/mm.c
@@ -1200,7 +1200,7 @@ get_page_from_l4e(
}
#endif /* CONFIG_PV */
-static int _put_page_type(struct page_info *page, bool preemptible,
+static int _put_page_type(struct page_info *page, unsigned int flags,
struct page_info *ptpg);
void put_page_from_l1e(l1_pgentry_t l1e, struct domain *l1e_owner)
@@ -1320,7 +1320,7 @@ static int put_page_from_l2e(l2_pgentry_t l2e, unsigned long pfn,
PTF_partial_set )
{
ASSERT(!(flags & PTF_defer));
- rc = _put_page_type(pg, true, ptpg);
+ rc = _put_page_type(pg, PTF_preemptible, ptpg);
}
else if ( flags & PTF_defer )
{
@@ -1329,7 +1329,7 @@ static int put_page_from_l2e(l2_pgentry_t l2e, unsigned long pfn,
}
else
{
- rc = _put_page_type(pg, true, ptpg);
+ rc = _put_page_type(pg, PTF_preemptible, ptpg);
if ( likely(!rc) )
put_page(pg);
}
@@ -1366,7 +1366,7 @@ static int put_page_from_l3e(l3_pgentry_t l3e, unsigned long pfn,
PTF_partial_set )
{
ASSERT(!(flags & PTF_defer));
- return _put_page_type(pg, true, mfn_to_page(_mfn(pfn)));
+ return _put_page_type(pg, PTF_preemptible, mfn_to_page(_mfn(pfn)));
}
if ( flags & PTF_defer )
@@ -1376,7 +1376,7 @@ static int put_page_from_l3e(l3_pgentry_t l3e, unsigned long pfn,
return 0;
}
- rc = _put_page_type(pg, true, mfn_to_page(_mfn(pfn)));
+ rc = _put_page_type(pg, PTF_preemptible, mfn_to_page(_mfn(pfn)));
if ( likely(!rc) )
put_page(pg);
@@ -1397,7 +1397,7 @@ static int put_page_from_l4e(l4_pgentry_t l4e, unsigned long pfn,
PTF_partial_set )
{
ASSERT(!(flags & PTF_defer));
- return _put_page_type(pg, true, mfn_to_page(_mfn(pfn)));
+ return _put_page_type(pg, PTF_preemptible, mfn_to_page(_mfn(pfn)));
}
if ( flags & PTF_defer )
@@ -1407,7 +1407,7 @@ static int put_page_from_l4e(l4_pgentry_t l4e, unsigned long pfn,
return 0;
}
- rc = _put_page_type(pg, true, mfn_to_page(_mfn(pfn)));
+ rc = _put_page_type(pg, PTF_preemptible, mfn_to_page(_mfn(pfn)));
if ( likely(!rc) )
put_page(pg);
}
@@ -2757,10 +2757,11 @@ static int _put_final_page_type(struct page_info *page, unsigned long type,
}
-static int _put_page_type(struct page_info *page, bool preemptible,
+static int _put_page_type(struct page_info *page, unsigned int flags,
struct page_info *ptpg)
{
unsigned long nx, x, y = page->u.inuse.type_info;
+ bool preemptible = flags & PTF_preemptible;
ASSERT(current_locked_page_ne_check(page));
@@ -2969,7 +2970,7 @@ static int _get_page_type(struct page_info *page, unsigned long type,
if ( unlikely(iommu_ret) )
{
- _put_page_type(page, false, NULL);
+ _put_page_type(page, 0, NULL);
rc = iommu_ret;
goto out;
}
@@ -2996,7 +2997,7 @@ static int _get_page_type(struct page_info *page, unsigned long type,
void put_page_type(struct page_info *page)
{
- int rc = _put_page_type(page, false, NULL);
+ int rc = _put_page_type(page, 0, NULL);
ASSERT(rc == 0);
(void)rc;
}
@@ -3013,7 +3014,7 @@ int get_page_type(struct page_info *page, unsigned long type)
int put_page_type_preemptible(struct page_info *page)
{
- return _put_page_type(page, true, NULL);
+ return _put_page_type(page, PTF_preemptible, NULL);
}
int get_page_type_preemptible(struct page_info *page, unsigned long type)
@@ -3030,7 +3031,7 @@ int put_old_guest_table(struct vcpu *v)
if ( !v->arch.old_guest_table )
return 0;
- switch ( rc = _put_page_type(v->arch.old_guest_table, true,
+ switch ( rc = _put_page_type(v->arch.old_guest_table, PTF_preemptible,
v->arch.old_guest_ptpg) )
{
case -EINTR:
--
2.23.0
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