On 08/12/2011 04:07 AM, Isaku Yamahata wrote:
This is a character device to hook page access.
The page fault in the area is reported to another user process by
this chardriver. Then, the process fills the page contents and
resolves the page fault.
Have you considered CUSE (character device in userspace, fs/fuse/cuse.c)?
index 55f5afb..623109e 100644
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -554,6 +554,7 @@ struct kvm_ppc_pvinfo {
#define KVM_CAP_PPC_SMT 64
#define KVM_CAP_PPC_RMA 65
#define KVM_CAP_MAX_VCPUS 66 /* returns max vcpus per vm */
+#define KVM_CAP_POST_COPY_MEMORY 67
#ifdef KVM_CAP_IRQ_ROUTING
@@ -760,6 +761,50 @@ struct kvm_clock_data {
/* Available with KVM_CAP_RMA */
#define KVM_ALLOCATE_RMA _IOR(KVMIO, 0xa9, struct kvm_allocate_rma)
+struct kvm_vmem_create {
+ __u64 size; /* in bytes */
+ __s32 vmem_fd;
+ __s32 shmem_fd;
+};
Should really be outside kvm.h (and virt/kvm), since it's not kvm specific.
+
+struct kvm_vmem_page_request {
+ __u32 nr;
+ __u64 __user *pgoffs;
+};
+
+struct kvm_vmem_page_cached {
+ __u32 nr;
+ __u64 __user *pgoffs;
+};
+
+struct kvm_vmem_page_range {
+ __u64 pgoff;
+ __u64 nr_pages;
+};
+
+struct kvm_vmem_make_pages_present {
+ __u32 nr;
+ struct kvm_vmem_page_range __user *ranges;
+};
This is madvise(MADV_WILLNEED), is it not?
+
+/* Available with KVM_CAP_POST_COPY_MEMORY */
+#define KVM_CREATE_VMEM_DEV _IO(KVMIO, 0xb0)
+
+/* ioctl for vmem_dev fd */
+#define KVM_CREATE_VMEM _IOR(KVMIO, 0xb1, __u32)
+
+/* ioctl for vmem fd */
+#define KVM_VMEM_WAIT_READY _IO(KVMIO, 0xb2)
+#define KVM_VMEM_READY _IO(KVMIO, 0xb3)
+#define KVM_VMEM_GET_PAGE_REQUEST \
+ _IOWR(KVMIO, 0xb4, struct kvm_vmem_page_request)
+#define KVM_VMEM_MARK_PAGE_CACHED \
+ _IOW(KVMIO, 0xb5, struct kvm_vmem_page_cached)
+#define KVM_VMEM_MAKE_PAGES_PRESENT \
+ _IOW(KVMIO, 0xb6, struct kvm_vmem_make_pages_present)
+#define KVM_VMEM_MAKE_VMA_ANONYMOUS _IO(KVMIO, 0xb7)
Can you explain these in some more detail?
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
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