qemu/osdep: Add huge page aligned support on LoongArch platform

Commit Message

bibo mao Jan. 15, 2024, 7:32 a.m. UTC

On LoongArch kvm mode if transparent huge page wants to be enabled, base
address and size of memslot from both HVA and GPA view. And LoongArch
supports both 4K and 16K page size with Linux kernel, so transparent huge
page size is calculated from real page size rather than hardcoded size.

Signed-off-by: Bibo Mao <[e-mail]>
---
 include/qemu/osdep.h | 8 ++++++++
 1 file changed, 8 insertions(+)

Comments

Paolo Bonzini Jan. 16, 2024, 10:12 a.m. UTC | #1

Queued, thanks.

Paolo

Patch

diff --git a/include/qemu/osdep.h b/include/qemu/osdep.h
index 9a405bed89..c9692cc314 100644
--- a/include/qemu/osdep.h
+++ b/include/qemu/osdep.h
@@ -547,6 +547,14 @@  int madvise(char *, size_t, int);
 #  define QEMU_VMALLOC_ALIGN (256 * 4096)
 #elif defined(__linux__) && defined(__sparc__)
 #  define QEMU_VMALLOC_ALIGN MAX(qemu_real_host_page_size(), SHMLBA)
+#elif defined(__linux__) && defined(__loongarch__)
+   /*
+    * For transparent hugepage optimization, it has better be huge page
+    * aligned. LoongArch host system supports two kinds of pagesize: 4K
+    * and 16K, here calculate huge page size from host page size
+    */
+#  define QEMU_VMALLOC_ALIGN (qemu_real_host_page_size() * \
+                         qemu_real_host_page_size() / sizeof(long))
 #else
 #  define QEMU_VMALLOC_ALIGN qemu_real_host_page_size()
 #endif