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[Qemu-devel] [RFC PATCH v4 08/28] QEMUSizedBuffer: Introduce two help fu
From: |
zhanghailiang |
Subject: |
[Qemu-devel] [RFC PATCH v4 08/28] QEMUSizedBuffer: Introduce two help functions for qsb |
Date: |
Thu, 26 Mar 2015 13:29:14 +0800 |
Introduce two new QEMUSizedBuffer APIs which will be used by COLO to buffer
VM state:
One is qsb_put_buffer(), which put the content of a given QEMUSizedBuffer
into QEMUFile, this is used to send buffered VM state to secondary.
Another is qsb_fill_buffer(), read 'size' bytes of data from the file into
qsb, this is used to get VM state from socket into a buffer.
Signed-off-by: Yang Hongyang <address@hidden>
Signed-off-by: zhanghailiang <address@hidden>
---
include/migration/qemu-file.h | 3 ++-
migration/qemu-file-buf.c | 58 +++++++++++++++++++++++++++++++++++++++++++
2 files changed, 60 insertions(+), 1 deletion(-)
diff --git a/include/migration/qemu-file.h b/include/migration/qemu-file.h
index 745a850..09a0e2a 100644
--- a/include/migration/qemu-file.h
+++ b/include/migration/qemu-file.h
@@ -140,7 +140,8 @@ ssize_t qsb_get_buffer(const QEMUSizedBuffer *, off_t
start, size_t count,
uint8_t *buf);
ssize_t qsb_write_at(QEMUSizedBuffer *qsb, const uint8_t *buf,
off_t pos, size_t count);
-
+void qsb_put_buffer(QEMUFile *f, QEMUSizedBuffer *qsb, int size);
+int qsb_fill_buffer(QEMUSizedBuffer *qsb, QEMUFile *f, int size);
/*
* For use on files opened with qemu_bufopen
diff --git a/migration/qemu-file-buf.c b/migration/qemu-file-buf.c
index 16a51a1..686f417 100644
--- a/migration/qemu-file-buf.c
+++ b/migration/qemu-file-buf.c
@@ -365,6 +365,64 @@ ssize_t qsb_write_at(QEMUSizedBuffer *qsb, const uint8_t
*source,
return count;
}
+
+/**
+ * Put the content of a given QEMUSizedBuffer into QEMUFile.
+ *
+ * @f: A QEMUFile
+ * @qsb: A QEMUSizedBuffer
+ * @size: size of content to write
+ */
+void qsb_put_buffer(QEMUFile *f, QEMUSizedBuffer *qsb, int size)
+{
+ int i, l;
+
+ for (i = 0; i < qsb->n_iov && size > 0; i++) {
+ l = MIN(qsb->iov[i].iov_len, size);
+ qemu_put_buffer(f, qsb->iov[i].iov_base, l);
+ size -= l;
+ }
+}
+
+/*
+ * Read 'size' bytes of data from the file into qsb.
+ * always fill from pos 0 and used after qsb_create().
+ *
+ * It will return size bytes unless there was an error, in which case it will
+ * return as many as it managed to read (assuming blocking fd's which
+ * all current QEMUFile are)
+ */
+int qsb_fill_buffer(QEMUSizedBuffer *qsb, QEMUFile *f, int size)
+{
+ ssize_t rc = qsb_grow(qsb, size);
+ int pending = size, i;
+ qsb->used = 0;
+ uint8_t *buf = NULL;
+
+ if (rc < 0) {
+ return rc;
+ }
+
+ for (i = 0; i < qsb->n_iov && pending > 0; i++) {
+ int doneone = 0;
+ /* read until iov full */
+ while (doneone < qsb->iov[i].iov_len && pending > 0) {
+ int readone = 0;
+ buf = qsb->iov[i].iov_base;
+ readone = qemu_get_buffer(f, buf,
+ MIN(qsb->iov[i].iov_len - doneone, pending));
+ if (readone == 0) {
+ return qsb->used;
+ }
+ buf += readone;
+ doneone += readone;
+ pending -= readone;
+ qsb->used += readone;
+ }
+ }
+ return qsb->used;
+}
+
typedef struct QEMUBuffer {
QEMUSizedBuffer *qsb;
QEMUFile *file;
--
1.7.12.4
- [Qemu-devel] [RFC PATCH v4 00/28] COarse-grain LOck-stepping(COLO) Virtual Machines for Non-stop Service, zhanghailiang, 2015/03/26
- [Qemu-devel] [RFC PATCH v4 11/28] COLO VMstate: Load VM state into qsb before restore it, zhanghailiang, 2015/03/26
- [Qemu-devel] [RFC PATCH v4 04/28] migration: Integrate COLO checkpoint process into migration, zhanghailiang, 2015/03/26
- [Qemu-devel] [RFC PATCH v4 12/28] arch_init: Start to trace dirty pages of SVM, zhanghailiang, 2015/03/26
- [Qemu-devel] [RFC PATCH v4 09/28] COLO: Save VM state to slave when do checkpoint, zhanghailiang, 2015/03/26
- [Qemu-devel] [RFC PATCH v4 07/28] COLO: Add a new RunState RUN_STATE_COLO, zhanghailiang, 2015/03/26
- [Qemu-devel] [RFC PATCH v4 08/28] QEMUSizedBuffer: Introduce two help functions for qsb,
zhanghailiang <=
- [Qemu-devel] [RFC PATCH v4 01/28] configure: Add parameter for configure to enable/disable COLO support, zhanghailiang, 2015/03/26
- [Qemu-devel] [RFC PATCH v4 02/28] migration: Introduce capability 'colo' to migration, zhanghailiang, 2015/03/26
- [Qemu-devel] [RFC PATCH v4 23/28] COLO: Improve checkpoint efficiency by do additional periodic checkpoint, zhanghailiang, 2015/03/26
- [Qemu-devel] [RFC PATCH v4 18/28] COLO NIC: Init/remove colo nic devices when add/cleanup tap devices, zhanghailiang, 2015/03/26
- [Qemu-devel] [RFC PATCH v4 19/28] COLO NIC: Implement colo nic device interface configure(), zhanghailiang, 2015/03/26
- [Qemu-devel] [RFC PATCH v4 05/28] migration: Integrate COLO checkpoint process into loadvm, zhanghailiang, 2015/03/26
- [Qemu-devel] [RFC PATCH v4 26/28] COLO: Disable qdev hotplug when VM is in COLO mode, zhanghailiang, 2015/03/26
- [Qemu-devel] [RFC PATCH v4 28/28] COLO: Add block replication into colo process, zhanghailiang, 2015/03/26
- [Qemu-devel] [RFC PATCH v4 22/28] COLO: Do checkpoint according to the result of net packets comparing, zhanghailiang, 2015/03/26
- [Qemu-devel] [RFC PATCH v4 27/28] COLO: Implement shutdown checkpoint, zhanghailiang, 2015/03/26