From: Julien Grall <julien.grall@arm.com>
Date: Sun, 21 Apr 2019 18:53:12 +0000 (+0100)
Subject: xen/arm32: mm: Avoid cleaning the cache for secondary CPUs page-tables
X-Git-Tag: 4.13.0-rc1~753
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=9bd8d268d8b586ad6948feb42f709df39271d7c4;p=xen.git

xen/arm32: mm: Avoid cleaning the cache for secondary CPUs page-tables

The page-table walker is configured by TCR_EL2 to use the same
shareability and cacheability as the access performed when updating the
page-tables. This means cleaning the cache for secondary CPUs runtime
page-tables is unnecessary.

Signed-off-by: Julien Grall <julien.grall@arm.com>
Reviewed-by: Andrii Anisov <andrii_anisov@epam.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
---

diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c
index 8751d763fb..7ed8400993 100644
--- a/xen/arch/arm/mm.c
+++ b/xen/arch/arm/mm.c
@@ -738,9 +738,6 @@ int init_secondary_pagetables(int cpu)
         write_pte(&first[first_table_offset(DOMHEAP_VIRT_START+i*FIRST_SIZE)], pte);
     }
 
-    clean_dcache_va_range(first, PAGE_SIZE);
-    clean_dcache_va_range(domheap, DOMHEAP_SECOND_PAGES*PAGE_SIZE);
-
     per_cpu(xen_pgtable, cpu) = first;
     per_cpu(xen_dommap, cpu) = domheap;