vmbase: Add map_data_noflush()
Support use-cases where clients want to map pages R/W and know that they
won't rely on the cache flushing of deactivate_dynamic_page_tables(),
such as pvmfw mapping the kernel payload R/W when booted in EFI mode.
At a low-level, map_data_noflush() doesn't need to create page-level
mappings for accurate dirty state tracking, unlike map_data(), which
reduces the total number of page tables, limiting heap pressure.
Test: m pvmfw_bin
Change-Id: I4e9e7d49e353c5d2f81834054e2a669cc4ce46c8
diff --git a/libs/libvmbase/src/memory.rs b/libs/libvmbase/src/memory.rs
index fd4706f..9153706 100644
--- a/libs/libvmbase/src/memory.rs
+++ b/libs/libvmbase/src/memory.rs
@@ -26,9 +26,9 @@
pub use page_table::PageTable;
pub use shared::MemoryRange;
pub use tracker::{
- deactivate_dynamic_page_tables, init_shared_pool, map_data, map_device, map_image_footer,
- map_rodata, map_rodata_outside_main_memory, resize_available_memory, unshare_all_memory,
- unshare_all_mmio_except_uart, unshare_uart,
+ deactivate_dynamic_page_tables, init_shared_pool, map_data, map_data_noflush, map_device,
+ map_image_footer, map_rodata, map_rodata_outside_main_memory, resize_available_memory,
+ unshare_all_memory, unshare_all_mmio_except_uart, unshare_uart,
};
pub use util::{
flush, flushed_zeroize, page_4kb_of, PAGE_SIZE, SIZE_128KB, SIZE_16KB, SIZE_2MB, SIZE_4KB,