repository: /home/avi/kvm
branch: (no branch)
commit 899d1bccc1c9691d2075249ed30fc8b35f97a45e
Author: Izik Eidus <[EMAIL PROTECTED]>
Date: Wed Nov 7 19:12:48 2007 +0200
add function that create memory hole in the middle of other slot memory
Signed-off-by: Izik Eidus <[EMAIL PROTECTED]>
diff --git a/libkvm/libkvm.c b/libkvm/libkvm.c
index a365aeb..90d93f2 100644
--- a/libkvm/libkvm.c
+++ b/libkvm/libkvm.c
@@ -113,6 +113,17 @@ int get_slot(unsigned long phys_addr)
return -1;
}
+int get_intersecting_slot(unsigned long phys_addr)
+{
+ int i;
+
+ for (i = 0; i < KVM_MAX_NUM_MEM_REGIONS ; ++i)
+ if (slots[i].len && slots[i].phys_addr < phys_addr &&
+ (slots[i].phys_addr + slots[i].len) > phys_addr)
+ return i;
+ return -1;
+}
+
/*
* dirty pages logging control
*/
@@ -450,6 +461,68 @@ void *kvm_create_phys_mem(kvm_context_t kvm, unsigned long
phys_start,
log, writable);
}
+int kvm_create_mem_hole(kvm_context_t kvm, unsigned long phys_start,
+ unsigned long len)
+{
+ int slot;
+ int r;
+ struct kvm_userspace_memory_region rmslot;
+ struct kvm_userspace_memory_region newslot1;
+ struct kvm_userspace_memory_region newslot2;
+
+ len = (len + PAGE_SIZE - 1) & PAGE_MASK;
+
+ slot = get_intersecting_slot(phys_start);
+ /* no need to create hole, as there is already hole */
+ if (slot == -1)
+ return 0;
+
+ memset(&rmslot, 0, sizeof(struct kvm_userspace_memory_region));
+ memset(&newslot1, 0, sizeof(struct kvm_userspace_memory_region));
+ memset(&newslot2, 0, sizeof(struct kvm_userspace_memory_region));
+
+ rmslot.guest_phys_addr = slots[slot].phys_addr;
+ rmslot.slot = slot;
+
+ newslot1.guest_phys_addr = slots[slot].phys_addr;
+ newslot1.memory_size = phys_start - slots[slot].phys_addr;
+ newslot1.slot = slot;
+ newslot1.userspace_addr = slots[slot].userspace_addr;
+
+ newslot2.guest_phys_addr = newslot1.guest_phys_addr +
+ newslot1.memory_size + len;
+ newslot2.memory_size = slots[slot].phys_addr +
+ slots[slot].len - newslot2.guest_phys_addr;
+ newslot2.userspace_addr = newslot1.userspace_addr +
+ newslot1.memory_size;
+ newslot2.slot = get_free_slot(kvm);
+
+ r = ioctl(kvm->vm_fd, KVM_SET_USER_MEMORY_REGION, &rmslot);
+ if (r == -1) {
+ fprintf(stderr, "kvm_create_mem_hole: %s\n", strerror(errno));
+ return -1;
+ }
+ free_slot(slot);
+
+ r = ioctl(kvm->vm_fd, KVM_SET_USER_MEMORY_REGION, &newslot1);
+ if (r == -1) {
+ fprintf(stderr, "kvm_create_mem_hole: %s\n", strerror(errno));
+ return -1;
+ }
+ register_slot(newslot1.slot, newslot1.guest_phys_addr,
+ newslot1.memory_size, 1, newslot1.userspace_addr);
+
+ r = ioctl(kvm->vm_fd, KVM_SET_USER_MEMORY_REGION, &newslot2);
+ if (r == -1) {
+ fprintf(stderr, "kvm_create_mem_hole: %s\n", strerror(errno));
+ return -1;
+ }
+ register_slot(newslot2.slot, newslot2.guest_phys_addr,
+ newslot2.memory_size, 1, newslot2.userspace_addr);
+
+ return 0;
+}
+
int kvm_register_userspace_phys_mem(kvm_context_t kvm,
unsigned long phys_start, void *userspace_addr,
unsigned long len, int log)
diff --git a/libkvm/libkvm.h b/libkvm/libkvm.h
index 8a41df7..bbf445c 100644
--- a/libkvm/libkvm.h
+++ b/libkvm/libkvm.h
@@ -411,6 +411,8 @@ void *kvm_create_phys_mem(kvm_context_t, unsigned long
phys_start,
unsigned long len, int log, int writable);
void kvm_destroy_phys_mem(kvm_context_t, unsigned long phys_start,
unsigned long len);
+int kvm_create_mem_hole(kvm_context_t kvm, unsigned long phys_start,
+ unsigned long len);
int kvm_register_userspace_phys_mem(kvm_context_t kvm,
unsigned long phys_start, void *userspace_addr,
unsigned long len, int log);
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