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Re: [PATCH v2 4/4] migration: Allow postcopy_ram_supported_by_host() to
From: |
Juan Quintela |
Subject: |
Re: [PATCH v2 4/4] migration: Allow postcopy_ram_supported_by_host() to report err |
Date: |
Wed, 19 Apr 2023 21:51:24 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/28.2 (gnu/linux) |
Peter Xu <peterx@redhat.com> wrote:
> Instead of print it to STDERR, bring the error upwards so that it can be
> reported via QMP responses.
>
> E.g.:
>
> { "execute": "migrate-set-capabilities" ,
> "arguments": { "capabilities":
> [ { "capability": "postcopy-ram", "state": true } ] } }
>
> { "error":
> { "class": "GenericError",
> "desc": "Postcopy is not supported: Host backend files need to be TMPFS
> or HUGETLBFS only" } }
>
> Signed-off-by: Peter Xu <peterx@redhat.com>
> ---
> migration/migration.c | 9 +++---
> migration/postcopy-ram.c | 61 ++++++++++++++++++++++------------------
> migration/postcopy-ram.h | 3 +-
> migration/savevm.c | 3 +-
> 4 files changed, 42 insertions(+), 34 deletions(-)
>
> diff --git a/migration/migration.c b/migration/migration.c
> index bda4789193..ac15fa6092 100644
> --- a/migration/migration.c
> +++ b/migration/migration.c
> @@ -1313,6 +1313,7 @@ static bool migrate_caps_check(bool *cap_list,
> MigrationCapabilityStatusList *cap;
> bool old_postcopy_cap;
> MigrationIncomingState *mis = migration_incoming_get_current();
> + Error *local_err = NULL;
This variable can be declared in the only block that uses it.
> diff --git a/migration/postcopy-ram.c b/migration/postcopy-ram.c
> index bbb8af61ae..0713ddeeef 100644
> --- a/migration/postcopy-ram.c
> +++ b/migration/postcopy-ram.c
> @@ -282,11 +282,14 @@ static bool request_ufd_features(int ufd, uint64_t
> features)
> return true;
> }
>
> -static bool ufd_check_and_apply(int ufd, MigrationIncomingState *mis)
> +static bool ufd_check_and_apply(int ufd, MigrationIncomingState *mis,
> + Error **errp)
> {
> uint64_t asked_features = 0;
> static uint64_t supported_features;
>
> + assert(errp);
> +
Is this right? My impression was that you have to live with errp being NULL.
error_setg() knows how to handle it being NULL:
error_setg() -> error_setg_internal() -> error_setv()
static void error_setv(Error **errp,
const char *src, int line, const char *func,
ErrorClass err_class, const char *fmt, va_list ap,
const char *suffix)
{
....
if (errp == NULL) {
return;
}
> -static int test_ramblock_postcopiable(RAMBlock *rb)
> +static int test_ramblock_postcopiable(RAMBlock *rb, Error **errp)
In patch 3 you do this other change:
-static int test_ramblock_postcopiable(RAMBlock *rb, void *opaque)
+static int test_ramblock_postcopiable(RAMBlock *rb)
Can you do with a single change?
The idea of the patch is right.
Later, Juan.