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Re: [Qemu-devel] [PATCH v2 1/5] migration: disable RDMA WRITE after post
From: |
Dr. David Alan Gilbert |
Subject: |
Re: [Qemu-devel] [PATCH v2 1/5] migration: disable RDMA WRITE after postcopy started |
Date: |
Thu, 26 Apr 2018 17:11:03 +0100 |
User-agent: |
Mutt/1.9.5 (2018-04-13) |
* Lidong Chen (address@hidden) wrote:
> RDMA WRITE operations are performed with no notification to the destination
> qemu, then the destination qemu can not wakeup. This patch disable RDMA WRITE
> after postcopy started.
>
> Signed-off-by: Lidong Chen <address@hidden>
Reviewed-by: Dr. David Alan Gilbert <address@hidden>
> ---
> migration/qemu-file.c | 8 ++++++--
> migration/rdma.c | 12 ++++++++++++
> 2 files changed, 18 insertions(+), 2 deletions(-)
>
> diff --git a/migration/qemu-file.c b/migration/qemu-file.c
> index bb63c77..add8c3a 100644
> --- a/migration/qemu-file.c
> +++ b/migration/qemu-file.c
> @@ -253,8 +253,12 @@ size_t ram_control_save_page(QEMUFile *f, ram_addr_t
> block_offset,
> if (f->hooks && f->hooks->save_page) {
> int ret = f->hooks->save_page(f, f->opaque, block_offset,
> offset, size, bytes_sent);
> - f->bytes_xfer += size;
> - if (ret != RAM_SAVE_CONTROL_DELAYED) {
> + if (ret != RAM_SAVE_CONTROL_NOT_SUPP) {
> + f->bytes_xfer += size;
> + }
> +
> + if (ret != RAM_SAVE_CONTROL_DELAYED &&
> + ret != RAM_SAVE_CONTROL_NOT_SUPP) {
> if (bytes_sent && *bytes_sent > 0) {
> qemu_update_position(f, *bytes_sent);
> } else if (ret < 0) {
> diff --git a/migration/rdma.c b/migration/rdma.c
> index da474fc..a22be43 100644
> --- a/migration/rdma.c
> +++ b/migration/rdma.c
> @@ -2927,6 +2927,10 @@ static size_t qemu_rdma_save_page(QEMUFile *f, void
> *opaque,
>
> CHECK_ERROR_STATE();
>
> + if (migrate_get_current()->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) {
> + return RAM_SAVE_CONTROL_NOT_SUPP;
> + }
> +
> qemu_fflush(f);
>
> if (size > 0) {
> @@ -3482,6 +3486,10 @@ static int qemu_rdma_registration_start(QEMUFile *f,
> void *opaque,
>
> CHECK_ERROR_STATE();
>
> + if (migrate_get_current()->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) {
> + return 0;
> + }
> +
> trace_qemu_rdma_registration_start(flags);
> qemu_put_be64(f, RAM_SAVE_FLAG_HOOK);
> qemu_fflush(f);
> @@ -3504,6 +3512,10 @@ static int qemu_rdma_registration_stop(QEMUFile *f,
> void *opaque,
>
> CHECK_ERROR_STATE();
>
> + if (migrate_get_current()->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) {
> + return 0;
> + }
> +
> qemu_fflush(f);
> ret = qemu_rdma_drain_cq(f, rdma);
>
> --
> 1.8.3.1
>
--
Dr. David Alan Gilbert / address@hidden / Manchester, UK
- [Qemu-devel] [PATCH v2 0/5] Enable postcopy RDMA live migration, Lidong Chen, 2018/04/25
- [Qemu-devel] [PATCH v2 1/5] migration: disable RDMA WRITE after postcopy started, Lidong Chen, 2018/04/25
- Re: [Qemu-devel] [PATCH v2 1/5] migration: disable RDMA WRITE after postcopy started,
Dr. David Alan Gilbert <=
- [Qemu-devel] [PATCH v2 2/5] migration: create a dedicated connection for rdma return path, Lidong Chen, 2018/04/25
- [Qemu-devel] [PATCH v2 3/5] migration: remove unnecessary variables len in QIOChannelRDMA, Lidong Chen, 2018/04/25
- [Qemu-devel] [PATCH v2 5/5] migration: Stop rdma yielding during incoming postcopy, Lidong Chen, 2018/04/25
- [Qemu-devel] [PATCH v2 4/5] migration: implement bi-directional RDMA QIOChannel, Lidong Chen, 2018/04/25