[PATCH 1/3] RISC-V: KVM: Refactor kvm_arch_commit_memory_region()

[wang.yechao255 at zte.com.cn]

From: Wang Yechao <wang.yechao255 at zte.com.cn>

Refactor kvm_arch_commit_memory_region() as a preparation for a future
commit to look cleaner and more understandable. Also, it looks more
like its arm64 and x86 counterparts.

Signed-off-by: Wang Yechao <wang.yechao255 at zte.com.cn>
---
 arch/riscv/kvm/mmu.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/arch/riscv/kvm/mmu.c b/arch/riscv/kvm/mmu.c
index c3539f660142..d2116c09c589 100644
--- a/arch/riscv/kvm/mmu.c
+++ b/arch/riscv/kvm/mmu.c
@@ -156,12 +156,22 @@ void kvm_arch_commit_memory_region(struct kvm *kvm,
 				const struct kvm_memory_slot *new,
 				enum kvm_mr_change change)
 {
+	bool log_dirty_pages = new && new->flags & KVM_MEM_LOG_DIRTY_PAGES;
+	bool read_only = new && new->flags & KVM_MEM_READONLY;
+
+	/*
+	 * Nothing more to do for RO slots (which can't be dirtied and can't be
+	 * made writable) or CREATE/MOVE/DELETE of a slot.
+	 */
+	if ((change != KVM_MR_FLAGS_ONLY) || read_only)
+		return;
+
 	/*
 	 * At this point memslot has been committed and there is an
 	 * allocated dirty_bitmap[], dirty pages will be tracked while
 	 * the memory slot is write protected.
 	 */
-	if (change != KVM_MR_DELETE && new->flags & KVM_MEM_LOG_DIRTY_PAGES) {
+	if (log_dirty_pages) {
 		if (kvm_dirty_log_manual_protect_and_init_set(kvm))
 			return;
 		mmu_wp_memory_region(kvm, new->id);
-- 
2.47.3