|
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v4 09/31] x86/mm: rename and move update_intpte
That function is only used by PV guests supporting code, add pv_
prefix.
Export it via pv/mm.h. Move UPDATE_ENTRY as well.
Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>
---
Now it is no longer an inline function, but I don't think that matters
much.
---
xen/arch/x86/mm.c | 65 ---------------------------------------------
xen/arch/x86/pv/mm.c | 54 +++++++++++++++++++++++++++++++++++++
xen/include/asm-x86/pv/mm.h | 16 +++++++++++
3 files changed, 70 insertions(+), 65 deletions(-)
diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c
index d25d314673..dc4ac5592a 100644
--- a/xen/arch/x86/mm.c
+++ b/xen/arch/x86/mm.c
@@ -133,14 +133,6 @@
l1_pgentry_t __section(".bss.page_aligned") __aligned(PAGE_SIZE)
l1_fixmap[L1_PAGETABLE_ENTRIES];
-/*
- * PTE updates can be done with ordinary writes except:
- * 1. Debug builds get extra checking by using CMPXCHG[8B].
- */
-#if !defined(NDEBUG)
-#define PTE_UPDATE_WITH_CMPXCHG
-#endif
-
paddr_t __read_mostly mem_hotplug;
/* Private domain structs for DOMID_XEN and DOMID_IO. */
@@ -1812,63 +1804,6 @@ void page_unlock(struct page_info *page)
} while ( (y = cmpxchg(&page->u.inuse.type_info, x, nx)) != x );
}
-/*
- * How to write an entry to the guest pagetables.
- * Returns false for failure (pointer not valid), true for success.
- */
-static inline bool update_intpte(
- intpte_t *p, intpte_t old, intpte_t new, unsigned long mfn,
- struct vcpu *v, int preserve_ad)
-{
- bool rv = true;
-
-#ifndef PTE_UPDATE_WITH_CMPXCHG
- if ( !preserve_ad )
- {
- rv = paging_write_guest_entry(v, p, new, _mfn(mfn));
- }
- else
-#endif
- {
- intpte_t t = old;
-
- for ( ; ; )
- {
- intpte_t _new = new;
-
- if ( preserve_ad )
- _new |= old & (_PAGE_ACCESSED | _PAGE_DIRTY);
-
- rv = paging_cmpxchg_guest_entry(v, p, &t, _new, _mfn(mfn));
- if ( unlikely(rv == 0) )
- {
- gdprintk(XENLOG_WARNING,
- "Failed to update %" PRIpte " -> %" PRIpte
- ": saw %" PRIpte "\n", old, _new, t);
- break;
- }
-
- if ( t == old )
- break;
-
- /* Allowed to change in Accessed/Dirty flags only. */
- BUG_ON((t ^ old) & ~(intpte_t)(_PAGE_ACCESSED|_PAGE_DIRTY));
-
- old = t;
- }
- }
- return rv;
-}
-
-/*
- * Macro that wraps the appropriate type-changes around update_intpte().
- * Arguments are: type, ptr, old, new, mfn, vcpu
- */
-#define UPDATE_ENTRY(_t,_p,_o,_n,_m,_v,_ad) \
- update_intpte(&_t ## e_get_intpte(*(_p)), \
- _t ## e_get_intpte(_o), _t ## e_get_intpte(_n), \
- (_m), (_v), (_ad))
-
/*
* PTE flags that a guest may change without re-validating the PTE.
* All other bits affect translation, caching, or Xen's safety.
diff --git a/xen/arch/x86/pv/mm.c b/xen/arch/x86/pv/mm.c
index aa2ce34145..2cb5995e62 100644
--- a/xen/arch/x86/pv/mm.c
+++ b/xen/arch/x86/pv/mm.c
@@ -24,6 +24,13 @@
#include <asm/pv/mm.h>
+/*
+ * PTE updates can be done with ordinary writes except:
+ * 1. Debug builds get extra checking by using CMPXCHG[8B].
+ */
+#if !defined(NDEBUG)
+#define PTE_UPDATE_WITH_CMPXCHG
+#endif
/* Read a PV guest's l1e that maps this virtual address. */
void pv_get_guest_eff_l1e(unsigned long addr, l1_pgentry_t *eff_l1e)
@@ -56,6 +63,53 @@ void pv_get_guest_eff_kern_l1e(struct vcpu *v, unsigned long
addr,
toggle_guest_mode(v);
}
+/*
+ * How to write an entry to the guest pagetables.
+ * Returns false for failure (pointer not valid), true for success.
+ */
+bool pv_update_intpte(intpte_t *p, intpte_t old, intpte_t new,
+ unsigned long mfn, struct vcpu *v, int preserve_ad)
+{
+ bool rv = true;
+
+#ifndef PTE_UPDATE_WITH_CMPXCHG
+ if ( !preserve_ad )
+ {
+ rv = paging_write_guest_entry(v, p, new, _mfn(mfn));
+ }
+ else
+#endif
+ {
+ intpte_t t = old;
+
+ for ( ; ; )
+ {
+ intpte_t _new = new;
+
+ if ( preserve_ad )
+ _new |= old & (_PAGE_ACCESSED | _PAGE_DIRTY);
+
+ rv = paging_cmpxchg_guest_entry(v, p, &t, _new, _mfn(mfn));
+ if ( unlikely(rv == 0) )
+ {
+ gdprintk(XENLOG_WARNING,
+ "Failed to update %" PRIpte " -> %" PRIpte
+ ": saw %" PRIpte "\n", old, _new, t);
+ break;
+ }
+
+ if ( t == old )
+ break;
+
+ /* Allowed to change in Accessed/Dirty flags only. */
+ BUG_ON((t ^ old) & ~(intpte_t)(_PAGE_ACCESSED|_PAGE_DIRTY));
+
+ old = t;
+ }
+ }
+ return rv;
+}
+
/*
* Local variables:
* mode: C
diff --git a/xen/include/asm-x86/pv/mm.h b/xen/include/asm-x86/pv/mm.h
index 19dbc3b66c..72c04c684f 100644
--- a/xen/include/asm-x86/pv/mm.h
+++ b/xen/include/asm-x86/pv/mm.h
@@ -28,6 +28,17 @@ void pv_get_guest_eff_l1e(unsigned long addr, l1_pgentry_t
*eff_l1e);
void pv_get_guest_eff_kern_l1e(struct vcpu *v, unsigned long addr,
void *eff_l1e);
+bool pv_update_intpte(intpte_t *p, intpte_t old, intpte_t new,
+ unsigned long mfn, struct vcpu *v, int preserve_ad);
+/*
+ * Macro that wraps the appropriate type-changes around update_intpte().
+ * Arguments are: type, ptr, old, new, mfn, vcpu
+ */
+#define UPDATE_ENTRY(_t,_p,_o,_n,_m,_v,_ad) \
+ pv_update_intpte(&_t ## e_get_intpte(*(_p)), \
+ _t ## e_get_intpte(_o), _t ## e_get_intpte(_n), \
+ (_m), (_v), (_ad))
+
#else
static inline void pv_get_guest_eff_l1e(unsigned long addr,
@@ -38,6 +49,11 @@ static inline void pv_get_guest_eff_kern_l1e(struct vcpu *v,
unsigned long addr,
void *eff_l1e)
{}
+static inline bool pv_update_intpte(intpte_t *p, intpte_t old, intpte_t new,
+ unsigned long mfn, struct vcpu *v,
+ int preserve_ad)
+{ return false; }
+
#endif
#endif /* __X86_PV_MM_H__ */
--
2.11.0
_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
https://lists.xen.org/xen-devel
|
 |
Lists.xenproject.org is hosted with RackSpace, monitoring our |