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From ab6262bd4829e3bd6437fe32737209df2af2d141 Mon Sep 17 00:00:00 2001
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From: Juan Quintela <quintela@redhat.com>
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Date: Wed, 18 May 2022 02:52:23 -0300
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Subject: [PATCH 08/37] multifd: Make zstd compression method not use iovs
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Leonardo Brás <leobras@redhat.com>
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RH-MergeRequest: 191: MSG_ZEROCOPY + Multifd @ rhel8.7
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RH-Commit: [8/26] 010579fa73b5a4c6fd631dc9fbaf6f974974bc99
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RH-Bugzilla: 2072049
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RH-Acked-by: Peter Xu <peterx@redhat.com>
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RH-Acked-by: Daniel P. Berrangé <berrange@redhat.com>
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RH-Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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Signed-off-by: Juan Quintela <quintela@redhat.com>
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Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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(cherry picked from commit f5ff548774c22b34a0c0e2fef85f1be11160d774)
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Signed-off-by: Leonardo Bras <leobras@redhat.com>
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---
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migration/multifd-zstd.c | 20 ++++++++++----------
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1 file changed, 10 insertions(+), 10 deletions(-)
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diff --git a/migration/multifd-zstd.c b/migration/multifd-zstd.c
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index f0d1105792..d9ed42622b 100644
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--- a/migration/multifd-zstd.c
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+++ b/migration/multifd-zstd.c
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@@ -13,6 +13,7 @@
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#include "qemu/osdep.h"
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#include <zstd.h>
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#include "qemu/rcu.h"
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+#include "exec/ramblock.h"
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#include "exec/target_page.h"
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#include "qapi/error.h"
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#include "migration.h"
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@@ -113,8 +114,8 @@ static void zstd_send_cleanup(MultiFDSendParams *p, Error **errp)
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*/
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static int zstd_send_prepare(MultiFDSendParams *p, Error **errp)
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{
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- struct iovec *iov = p->pages->iov;
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struct zstd_data *z = p->data;
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+ size_t page_size = qemu_target_page_size();
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int ret;
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uint32_t i;
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@@ -128,8 +129,8 @@ static int zstd_send_prepare(MultiFDSendParams *p, Error **errp)
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if (i == p->pages->num - 1) {
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flush = ZSTD_e_flush;
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}
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- z->in.src = iov[i].iov_base;
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- z->in.size = iov[i].iov_len;
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+ z->in.src = p->pages->block->host + p->pages->offset[i];
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+ z->in.size = page_size;
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z->in.pos = 0;
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/*
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@@ -261,7 +262,8 @@ static int zstd_recv_pages(MultiFDRecvParams *p, Error **errp)
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{
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uint32_t in_size = p->next_packet_size;
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uint32_t out_size = 0;
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- uint32_t expected_size = p->pages->num * qemu_target_page_size();
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+ size_t page_size = qemu_target_page_size();
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+ uint32_t expected_size = p->pages->num * page_size;
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uint32_t flags = p->flags & MULTIFD_FLAG_COMPRESSION_MASK;
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struct zstd_data *z = p->data;
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int ret;
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@@ -283,10 +285,8 @@ static int zstd_recv_pages(MultiFDRecvParams *p, Error **errp)
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z->in.pos = 0;
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for (i = 0; i < p->pages->num; i++) {
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- struct iovec *iov = &p->pages->iov[i];
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-
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- z->out.dst = iov->iov_base;
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- z->out.size = iov->iov_len;
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+ z->out.dst = p->pages->block->host + p->pages->offset[i];
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+ z->out.size = page_size;
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z->out.pos = 0;
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/*
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@@ -300,8 +300,8 @@ static int zstd_recv_pages(MultiFDRecvParams *p, Error **errp)
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do {
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ret = ZSTD_decompressStream(z->zds, &z->out, &z->in);
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} while (ret > 0 && (z->in.size - z->in.pos > 0)
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- && (z->out.pos < iov->iov_len));
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- if (ret > 0 && (z->out.pos < iov->iov_len)) {
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+ && (z->out.pos < page_size));
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+ if (ret > 0 && (z->out.pos < page_size)) {
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error_setg(errp, "multifd %d: decompressStream buffer too small",
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p->id);
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return -1;
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--
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2.35.3
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