From d4d9fad2ee5ee50b23f09b01bc43f4cf8128c53b Mon Sep 17 00:00:00 2001
From: David Stevens <stevensd@chromium.org>
Date: Tue, 9 Apr 2024 13:43:38 +0900
Subject: [PATCH] base: Round up when calculating cache flush count

When dividing target length by the cache line size, round up to make
sure we flush the entire target region.

BUG=b:316402315
TEST=tast run asurada arc.Boot.vm

Change-Id: I66938bb51e1ce58f17e4bb28ec7b8f1e14a4fc6d
Reviewed-on: https://chromium-review.googlesource.com/c/crosvm/crosvm/+/5437515
Reviewed-by: Keiichi Watanabe <keiichiw@chromium.org>
Commit-Queue: David Stevens <stevensd@chromium.org>
---
 base/src/mmap.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/base/src/mmap.rs b/base/src/mmap.rs
index 87737a571d..fd53fa8af3 100644
--- a/base/src/mmap.rs
+++ b/base/src/mmap.rs
@@ -394,7 +394,7 @@ impl MemoryMapping {
         let mut next: *const u8 = unsafe { addr.add(offset) };
 
         let cacheline_size = get_cacheline_size();
-        let cacheline_count = len / cacheline_size;
+        let cacheline_count = len.div_ceil(cacheline_size);
 
         for _ in 0..cacheline_count {
             // SAFETY: