qemu-kvm/kvm-multifd-Make-zlib-compression-method-not-use-iovs.patch

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From 75cd92cb7cff055f46163e64d66ba3f685f9ac04 Mon Sep 17 00:00:00 2001
From: Juan Quintela <quintela@redhat.com>
Date: Wed, 18 May 2022 02:52:23 -0300
Subject: [PATCH 09/37] multifd: Make zlib compression method not use iovs
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
RH-Author: Leonardo Brás <leobras@redhat.com>
RH-MergeRequest: 191: MSG_ZEROCOPY + Multifd @ rhel8.7
RH-Commit: [9/26] d33dd62b833d50fee989a195aebcc8d5e7d43181
RH-Bugzilla: 2072049
RH-Acked-by: Peter Xu <peterx@redhat.com>
RH-Acked-by: Daniel P. Berrangé <berrange@redhat.com>
RH-Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
(cherry picked from commit a5ed22948873b50fcf1415d1ce15c71d61a9388d)
Signed-off-by: Leonardo Bras <leobras@redhat.com>
---
migration/multifd-zlib.c | 17 +++++++++--------
1 file changed, 9 insertions(+), 8 deletions(-)
diff --git a/migration/multifd-zlib.c b/migration/multifd-zlib.c
index 330fc021c5..a1950a4588 100644
--- a/migration/multifd-zlib.c
+++ b/migration/multifd-zlib.c
@@ -13,6 +13,7 @@
#include "qemu/osdep.h"
#include <zlib.h>
#include "qemu/rcu.h"
+#include "exec/ramblock.h"
#include "exec/target_page.h"
#include "qapi/error.h"
#include "migration.h"
@@ -100,8 +101,8 @@ static void zlib_send_cleanup(MultiFDSendParams *p, Error **errp)
*/
static int zlib_send_prepare(MultiFDSendParams *p, Error **errp)
{
- struct iovec *iov = p->pages->iov;
struct zlib_data *z = p->data;
+ size_t page_size = qemu_target_page_size();
z_stream *zs = &z->zs;
uint32_t out_size = 0;
int ret;
@@ -115,8 +116,8 @@ static int zlib_send_prepare(MultiFDSendParams *p, Error **errp)
flush = Z_SYNC_FLUSH;
}
- zs->avail_in = iov[i].iov_len;
- zs->next_in = iov[i].iov_base;
+ zs->avail_in = page_size;
+ zs->next_in = p->pages->block->host + p->pages->offset[i];
zs->avail_out = available;
zs->next_out = z->zbuff + out_size;
@@ -240,6 +241,7 @@ static void zlib_recv_cleanup(MultiFDRecvParams *p)
static int zlib_recv_pages(MultiFDRecvParams *p, Error **errp)
{
struct zlib_data *z = p->data;
+ size_t page_size = qemu_target_page_size();
z_stream *zs = &z->zs;
uint32_t in_size = p->next_packet_size;
/* we measure the change of total_out */
@@ -264,7 +266,6 @@ static int zlib_recv_pages(MultiFDRecvParams *p, Error **errp)
zs->next_in = z->zbuff;
for (i = 0; i < p->pages->num; i++) {
- struct iovec *iov = &p->pages->iov[i];
int flush = Z_NO_FLUSH;
unsigned long start = zs->total_out;
@@ -272,8 +273,8 @@ static int zlib_recv_pages(MultiFDRecvParams *p, Error **errp)
flush = Z_SYNC_FLUSH;
}
- zs->avail_out = iov->iov_len;
- zs->next_out = iov->iov_base;
+ zs->avail_out = page_size;
+ zs->next_out = p->pages->block->host + p->pages->offset[i];
/*
* Welcome to inflate semantics
@@ -286,8 +287,8 @@ static int zlib_recv_pages(MultiFDRecvParams *p, Error **errp)
do {
ret = inflate(zs, flush);
} while (ret == Z_OK && zs->avail_in
- && (zs->total_out - start) < iov->iov_len);
- if (ret == Z_OK && (zs->total_out - start) < iov->iov_len) {
+ && (zs->total_out - start) < page_size);
+ if (ret == Z_OK && (zs->total_out - start) < page_size) {
error_setg(errp, "multifd %d: inflate generated too few output",
p->id);
return -1;
--
2.35.3