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

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 <maobibo@loongson.cn>
Message-ID: <20240115073244.174155-1-maobibo@loongson.cn>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/include/qemu/osdep.h b/include/qemu/osdep.h
index 9a405bed8937a28f5d655300ff2082e5602cfd24..c9692cc31425e64e2d1a09f7eabea21988fd4eb3 100644 (file)
--- 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