kvm-all: drop kvm_setup_guest_memory

kvm_setup_guest_memory only does "madvise to QEMU_MADV_DONTFORK" and
is only called by ram_block_add, which actually is duplicate code.
Bonus: add simple comment for kvm_has_sync_mmu to make life easier.

Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Cao jin <caoj.fnst@cn.fujitsu.com>
Message-Id: <1473662096-32598-1-git-send-email-caoj.fnst@cn.fujitsu.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 1 insertions, 14 deletions

diff --git a/kvm-all.c b/kvm-all.c
index ebf35b0c5b..8a4382eed8 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -2148,6 +2148,7 @@ void kvm_device_access(int fd, int group, uint64_t attr,
     }
 }
 
+/* Return 1 on success, 0 on failure */
 int kvm_has_sync_mmu(void)
 {
     return kvm_check_extension(kvm_state, KVM_CAP_SYNC_MMU);
@@ -2190,20 +2191,6 @@ int kvm_has_intx_set_mask(void)
     return kvm_state->intx_set_mask;
 }
 
-void kvm_setup_guest_memory(void *start, size_t size)
-{
-    if (!kvm_has_sync_mmu()) {
-        int ret = qemu_madvise(start, size, QEMU_MADV_DONTFORK);
-
-        if (ret) {
-            perror("qemu_madvise");
-            fprintf(stderr,
-                    "Need MADV_DONTFORK in absence of synchronous KVM MMU\n");
-            exit(1);
-        }
-    }
-}
-
 #ifdef KVM_CAP_SET_GUEST_DEBUG
 struct kvm_sw_breakpoint *kvm_find_sw_breakpoint(CPUState *cpu,
                                                  target_ulong pc)