[Xen-devel] [PATCH 2/4] xen: arm: flush TLB on all CPUs when setting or clearing fixmaps

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

These mappings are global and therefore need flushing on all processors. Add
flush_all_xen_data_tlb_range_va which accomplishes this.

Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
 xen/arch/arm/mm.c                |    4 ++--
 xen/include/asm-arm/arm32/page.h |   19 +++++++++++++++++++
 xen/include/asm-arm/arm64/page.h |   19 +++++++++++++++++++
 3 files changed, 40 insertions(+), 2 deletions(-)

diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c
index fb1bbf2..b7a8df0 100644
--- a/xen/arch/arm/mm.c
+++ b/xen/arch/arm/mm.c
@@ -217,7 +217,7 @@ void set_fixmap(unsigned map, unsigned long mfn, unsigned 
attributes)
     pte.pt.ai = attributes;
     pte.pt.xn = 1;
     write_pte(xen_fixmap + third_table_offset(FIXMAP_ADDR(map)), pte);
-    flush_xen_data_tlb_local_range_va(FIXMAP_ADDR(map), PAGE_SIZE);
+    flush_xen_data_tlb_range_va(FIXMAP_ADDR(map), PAGE_SIZE);
 }
 
 /* Remove a mapping from a fixmap entry */
@@ -225,7 +225,7 @@ void clear_fixmap(unsigned map)
 {
     lpae_t pte = {0};
     write_pte(xen_fixmap + third_table_offset(FIXMAP_ADDR(map)), pte);
-    flush_xen_data_tlb_local_range_va(FIXMAP_ADDR(map), PAGE_SIZE);
+    flush_xen_data_tlb_range_va(FIXMAP_ADDR(map), PAGE_SIZE);
 }
 
 #ifdef CONFIG_DOMAIN_PAGE
diff --git a/xen/include/asm-arm/arm32/page.h b/xen/include/asm-arm/arm32/page.h
index daa4931..27027d8 100644
--- a/xen/include/asm-arm/arm32/page.h
+++ b/xen/include/asm-arm/arm32/page.h
@@ -82,6 +82,25 @@ static inline void 
flush_xen_data_tlb_local_range_va(unsigned long va,
     isb();
 }
 
+/*
+ * Flush a range of VA's hypervisor mappings from the data TLB on all
+ * processors in the inner-shareable domain. This is not sufficient
+ * when changing code mappings or for self modifying code.
+ */
+static inline void flush_xen_data_tlb_range_va(unsigned long va,
+                                               unsigned long size)
+{
+    unsigned long end = va + size;
+    dsb(); /* Ensure preceding are visible */
+    while ( va < end ) {
+        asm volatile(STORE_CP32(0, TLBIMVAHIS)
+                     : : "r" (va) : "memory");
+        va += PAGE_SIZE;
+    }
+    dsb(); /* Ensure completion of the TLB flush */
+    isb();
+}
+
 /* Ask the MMU to translate a VA for us */
 static inline uint64_t __va_to_par(vaddr_t va)
 {
diff --git a/xen/include/asm-arm/arm64/page.h b/xen/include/asm-arm/arm64/page.h
index 9bea476..61a3e6c 100644
--- a/xen/include/asm-arm/arm64/page.h
+++ b/xen/include/asm-arm/arm64/page.h
@@ -74,6 +74,25 @@ static inline void 
flush_xen_data_tlb_local_range_va(unsigned long va,
     isb();
 }
 
+/*
+ * Flush a range of VA's hypervisor mappings from the data TLB of all
+ * processors in the inner-shareable domain. This is not sufficient
+ * when changing code mappings or for self modifying code.
+ */
+static inline void flush_xen_data_tlb_range_va(unsigned long va,
+                                               unsigned long size)
+{
+    unsigned long end = va + size;
+    dsb(); /* Ensure preceding are visible */
+    while ( va < end ) {
+        asm volatile("tlbi vae2is, %0;"
+                     : : "r" (va>>PAGE_SHIFT) : "memory");
+        va += PAGE_SIZE;
+    }
+    dsb(); /* Ensure completion of the TLB flush */
+    isb();
+}
+
 /* Ask the MMU to translate a VA for us */
 static inline uint64_t __va_to_par(vaddr_t va)
 {
-- 
1.7.10.4


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