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Re: [Qemu-devel] [PATCH v13 02/12] migration: Create multifd packet
From: |
Dr. David Alan Gilbert |
Subject: |
Re: [Qemu-devel] [PATCH v13 02/12] migration: Create multifd packet |
Date: |
Mon, 11 Jun 2018 12:10:12 +0100 |
User-agent: |
Mutt/1.10.0 (2018-05-17) |
* Juan Quintela (address@hidden) wrote:
> We still don't put anything there.
>
> Signed-off-by: Juan Quintela <address@hidden>
Reviewed-by: Dr. David Alan Gilbert <address@hidden>
>
> --
> fix magic (dave)
> check offset/ramblock (dave)
> ---
> migration/ram.c | 145 +++++++++++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 144 insertions(+), 1 deletion(-)
>
> diff --git a/migration/ram.c b/migration/ram.c
> index 23cc5625eb..54350db8b0 100644
> --- a/migration/ram.c
> +++ b/migration/ram.c
> @@ -510,6 +510,17 @@ typedef struct {
> uint8_t id;
> } __attribute__((packed)) MultiFDInit_t;
>
> +typedef struct {
> + uint32_t magic;
> + uint32_t version;
> + uint32_t flags;
> + uint32_t size;
> + uint32_t used;
> + uint32_t seq;
> + char ramblock[256];
> + uint64_t offset[];
> +} __attribute__((packed)) MultiFDPacket_t;
> +
> typedef struct {
> /* number of used pages */
> uint32_t used;
> @@ -544,6 +555,14 @@ typedef struct {
> bool quit;
> /* array of pages to sent */
> MultiFDPages_t *pages;
> + /* packet allocated len */
> + uint32_t packet_len;
> + /* pointer to the packet */
> + MultiFDPacket_t *packet;
> + /* multifd flags for each packet */
> + uint32_t flags;
> + /* global number of generated multifd packets */
> + uint32_t seq;
> } MultiFDSendParams;
>
> typedef struct {
> @@ -566,6 +585,14 @@ typedef struct {
> bool quit;
> /* array of pages to receive */
> MultiFDPages_t *pages;
> + /* packet allocated len */
> + uint32_t packet_len;
> + /* pointer to the packet */
> + MultiFDPacket_t *packet;
> + /* multifd flags for each packet */
> + uint32_t flags;
> + /* global number of generated multifd packets */
> + uint32_t seq;
> } MultiFDRecvParams;
>
> static int multifd_send_initial_packet(MultiFDSendParams *p, Error **errp)
> @@ -654,6 +681,99 @@ static void multifd_pages_clear(MultiFDPages_t *pages)
> g_free(pages);
> }
>
> +static void multifd_send_fill_packet(MultiFDSendParams *p)
> +{
> + MultiFDPacket_t *packet = p->packet;
> + int i;
> +
> + packet->magic = cpu_to_be32(MULTIFD_MAGIC);
> + packet->version = cpu_to_be32(MULTIFD_VERSION);
> + packet->flags = cpu_to_be32(p->flags);
> + packet->size = cpu_to_be32(migrate_multifd_page_count());
> + packet->used = cpu_to_be32(p->pages->used);
> + packet->seq = cpu_to_be32(p->seq);
> +
> + if (p->pages->block) {
> + strncpy(packet->ramblock, p->pages->block->idstr, 256);
> + }
> +
> + for (i = 0; i < p->pages->used; i++) {
> + packet->offset[i] = cpu_to_be64(p->pages->offset[i]);
> + }
> +}
> +
> +static int multifd_recv_unfill_packet(MultiFDRecvParams *p, Error **errp)
> +{
> + MultiFDPacket_t *packet = p->packet;
> + RAMBlock *block;
> + int i;
> +
> + /* ToDo: We can't use it until we haven't received a message */
> + return 0;
> +
> + be32_to_cpus(&packet->magic);
> + if (packet->magic != MULTIFD_MAGIC) {
> + error_setg(errp, "multifd: received packet "
> + "magic %x and expected magic %x",
> + packet->magic, MULTIFD_MAGIC);
> + return -1;
> + }
> +
> + be32_to_cpus(&packet->version);
> + if (packet->version != MULTIFD_VERSION) {
> + error_setg(errp, "multifd: received packet "
> + "version %d and expected version %d",
> + packet->version, MULTIFD_VERSION);
> + return -1;
> + }
> +
> + p->flags = be32_to_cpu(packet->flags);
> +
> + be32_to_cpus(&packet->size);
> + if (packet->size > migrate_multifd_page_count()) {
> + error_setg(errp, "multifd: received packet "
> + "with size %d and expected maximum size %d",
> + packet->size, migrate_multifd_page_count()) ;
> + return -1;
> + }
> +
> + p->pages->used = be32_to_cpu(packet->used);
> + if (p->pages->used > packet->size) {
> + error_setg(errp, "multifd: received packet "
> + "with size %d and expected maximum size %d",
> + p->pages->used, packet->size) ;
> + return -1;
> + }
> +
> + p->seq = be32_to_cpu(packet->seq);
> +
> + if (p->pages->used) {
> + /* make sure that ramblock is 0 terminated */
> + packet->ramblock[255] = 0;
> + block = qemu_ram_block_by_name(packet->ramblock);
> + if (!block) {
> + error_setg(errp, "multifd: unknown ram block %s",
> + packet->ramblock);
> + return -1;
> + }
> + }
> +
> + for (i = 0; i < p->pages->used; i++) {
> + ram_addr_t offset = be64_to_cpu(packet->offset[i]);
> +
> + if (offset > (block->used_length - TARGET_PAGE_SIZE)) {
> + error_setg(errp, "multifd: offset too long %" PRId64
> + " (max %" PRId64 ")",
> + offset, block->max_length);
> + return -1;
> + }
> + p->pages->iov[i].iov_base = block->host + offset;
> + p->pages->iov[i].iov_len = TARGET_PAGE_SIZE;
> + }
> +
> + return 0;
> +}
> +
> struct {
> MultiFDSendParams *params;
> /* number of created threads */
> @@ -711,6 +831,9 @@ int multifd_save_cleanup(Error **errp)
> p->name = NULL;
> multifd_pages_clear(p->pages);
> p->pages = NULL;
> + p->packet_len = 0;
> + g_free(p->packet);
> + p->packet = NULL;
> }
> g_free(multifd_send_state->params);
> multifd_send_state->params = NULL;
> @@ -732,6 +855,7 @@ static void *multifd_send_thread(void *opaque)
>
> while (true) {
> qemu_mutex_lock(&p->mutex);
> + multifd_send_fill_packet(p);
> if (p->quit) {
> qemu_mutex_unlock(&p->mutex);
> break;
> @@ -796,6 +920,9 @@ int multifd_save_setup(void)
> p->quit = false;
> p->id = i;
> p->pages = multifd_pages_init(page_count);
> + p->packet_len = sizeof(MultiFDPacket_t)
> + + sizeof(ram_addr_t) * page_count;
> + p->packet = g_malloc0(p->packet_len);
> p->name = g_strdup_printf("multifdsend_%d", i);
> socket_send_channel_create(multifd_new_send_channel_async, p);
> }
> @@ -855,6 +982,9 @@ int multifd_load_cleanup(Error **errp)
> p->name = NULL;
> multifd_pages_clear(p->pages);
> p->pages = NULL;
> + p->packet_len = 0;
> + g_free(p->packet);
> + p->packet = NULL;
> }
> g_free(multifd_recv_state->params);
> multifd_recv_state->params = NULL;
> @@ -867,10 +997,20 @@ int multifd_load_cleanup(Error **errp)
> static void *multifd_recv_thread(void *opaque)
> {
> MultiFDRecvParams *p = opaque;
> + Error *local_err = NULL;
> + int ret;
>
> while (true) {
> qemu_mutex_lock(&p->mutex);
> - if (p->quit) {
> + if (false) {
> + /* ToDo: Packet reception goes here */
> +
> + ret = multifd_recv_unfill_packet(p, &local_err);
> + qemu_mutex_unlock(&p->mutex);
> + if (ret) {
> + break;
> + }
> + } else if (p->quit) {
> qemu_mutex_unlock(&p->mutex);
> break;
> }
> @@ -907,6 +1047,9 @@ int multifd_load_setup(void)
> p->quit = false;
> p->id = i;
> p->pages = multifd_pages_init(page_count);
> + p->packet_len = sizeof(MultiFDPacket_t)
> + + sizeof(ram_addr_t) * page_count;
> + p->packet = g_malloc0(p->packet_len);
> p->name = g_strdup_printf("multifdrecv_%d", i);
> }
> return 0;
> --
> 2.17.0
>
--
Dr. David Alan Gilbert / address@hidden / Manchester, UK
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