[pve-devel] [PATCH pve-qemu] update patches with some pbs-state migration cleanups

[Fabian Grünbichler]

Tested-by: Fabian Grünbichler <f.gruenbichler at proxmox.com>

requires now updated patch from <20201124154122.22202-2-s.reiter at proxmox.com>:

"[PATCH v3 pve-qemu 1/3] update patches with squashed in 'include library version'"

On November 10, 2020 5:16 pm, Stefan Reiter wrote:
> ...and literal cleanup, as in, call save_cleanup after success or error.
> 
> Signed-off-by: Stefan Reiter <s.reiter at proxmox.com>
> ---
> 
> I found it more confusing to set opaque to a value and then never use it, so I
> put it back to NULL and documented it.
> 
> Behaviour tested to be the same.
> 
>  ...igrate-dirty-bitmap-state-via-savevm.patch | 33 ++++++++++++-------
>  1 file changed, 21 insertions(+), 12 deletions(-)
> 
> diff --git a/debian/patches/pve/0055-PVE-Migrate-dirty-bitmap-state-via-savevm.patch b/debian/patches/pve/0055-PVE-Migrate-dirty-bitmap-state-via-savevm.patch
> index 77c0c76..a39e3ca 100644
> --- a/debian/patches/pve/0055-PVE-Migrate-dirty-bitmap-state-via-savevm.patch
> +++ b/debian/patches/pve/0055-PVE-Migrate-dirty-bitmap-state-via-savevm.patch
> @@ -13,13 +13,13 @@ safe migration is possible and makes sense.
>  
>  Signed-off-by: Stefan Reiter <s.reiter at proxmox.com>
>  ---
> - include/migration/misc.h |  3 ++
> - migration/Makefile.objs  |  1 +
> - migration/pbs-state.c    | 97 ++++++++++++++++++++++++++++++++++++++++
> - pve-backup.c             |  1 +
> - qapi/block-core.json     |  6 +++
> - softmmu/vl.c             |  1 +
> - 6 files changed, 109 insertions(+)
> + include/migration/misc.h |   3 ++
> + migration/Makefile.objs  |   1 +
> + migration/pbs-state.c    | 106 +++++++++++++++++++++++++++++++++++++++
> + pve-backup.c             |   1 +
> + qapi/block-core.json     |   6 +++
> + softmmu/vl.c             |   1 +
> + 6 files changed, 118 insertions(+)
>   create mode 100644 migration/pbs-state.c
>  
>  diff --git a/include/migration/misc.h b/include/migration/misc.h
> @@ -48,10 +48,10 @@ index 0fc619e380..20b3792599 100644
>   common-obj-$(CONFIG_RDMA) += rdma.o
>  diff --git a/migration/pbs-state.c b/migration/pbs-state.c
>  new file mode 100644
> -index 0000000000..c711498c3e
> +index 0000000000..29f2b3860d
>  --- /dev/null
>  +++ b/migration/pbs-state.c
> -@@ -0,0 +1,97 @@
> +@@ -0,0 +1,106 @@
>  +/*
>  + * PBS (dirty-bitmap) state migration
>  + */
> @@ -67,6 +67,7 @@ index 0000000000..c711498c3e
>  +    bool active;
>  +} PBSState;
>  +
> ++/* state is accessed via this static variable directly, 'opaque' is NULL */
>  +static PBSState pbs_state;
>  +
>  +static void pbs_state_save_pending(QEMUFile *f, void *opaque,
> @@ -115,8 +116,9 @@ index 0000000000..c711498c3e
>  +
>  +static bool pbs_state_is_active(void *opaque)
>  +{
> -+    // we need to be return active once, else .save_setup is never called, but,
> -+    // if we'd just would return true, we'd freeze the migration for ~ 5 - 10s
> ++    /* we need to return active exactly once, else .save_setup is never called,
> ++     * but if we'd just return true the migration doesn't make progress since
> ++     * it'd be waiting for us */
>  +    return pbs_state.active;
>  +}
>  +
> @@ -133,6 +135,12 @@ index 0000000000..c711498c3e
>  +    return false;
>  +}
>  +
> ++static void pbs_state_save_cleanup(void *opaque)
> ++{
> ++    /* reset active after migration succeeds or fails */
> ++    pbs_state.active = false;
> ++}
> ++
>  +static SaveVMHandlers savevm_pbs_state_handlers = {
>  +    .save_setup = pbs_state_save_setup,
>  +    .has_postcopy = pbs_state_has_postcopy,
> @@ -140,6 +148,7 @@ index 0000000000..c711498c3e
>  +    .is_active_iterate = pbs_state_is_active_iterate,
>  +    .load_state = pbs_state_load,
>  +    .is_active = pbs_state_is_active,
> ++    .save_cleanup = pbs_state_save_cleanup,
>  +};
>  +
>  +void pbs_state_mig_init(void)
> @@ -147,7 +156,7 @@ index 0000000000..c711498c3e
>  +    pbs_state.active = true;
>  +    register_savevm_live("pbs-state", 0, 1,
>  +                         &savevm_pbs_state_handlers,
> -+                         &pbs_state);
> ++                         NULL);
>  +}
>  diff --git a/pve-backup.c b/pve-backup.c
>  index c7cde0fb0e..f65f1dda26 100644
> -- 
> 2.20.1
> 
> 
> 
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