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[Qemu-devel] Re: [PATCH] migration: Issue 'cont' only on successful inco
From: |
Luiz Capitulino |
Subject: |
[Qemu-devel] Re: [PATCH] migration: Issue 'cont' only on successful incoming migration |
Date: |
Fri, 23 Jul 2010 15:08:18 -0300 |
On Fri, 23 Jul 2010 16:15:15 +0530
Amit Shah <address@hidden> wrote:
> When a 'cont' is issued on a VM that's just waiting for an incoming
> migration, the VM reboots and boots into the guest, possibly corrupting
> its storage since it could be shared with another VM running elsewhere.
>
> Ensure that a VM started with '-incoming' is only run when an incoming
> migration successfully completes.
>
> Reported-by: Laine Stump <address@hidden>
> Signed-off-by: Amit Shah <address@hidden>
> ---
> migration.c | 3 +++
> monitor.c | 4 ++++
> sysemu.h | 1 +
> vl.c | 3 +++
> 4 files changed, 11 insertions(+), 0 deletions(-)
>
> diff --git a/migration.c b/migration.c
> index 650eb78..84d7e4a 100644
> --- a/migration.c
> +++ b/migration.c
> @@ -67,6 +67,9 @@ void process_incoming_migration(QEMUFile *f)
> qemu_announce_self();
> DPRINTF("successfully loaded vm state\n");
>
> + incoming_expected = false;
> + incoming_done = true;
> +
> if (autostart)
> vm_start();
> }
> diff --git a/monitor.c b/monitor.c
> index 45fd482..d12a7b5 100644
> --- a/monitor.c
> +++ b/monitor.c
> @@ -1056,6 +1056,10 @@ static int do_cont(Monitor *mon, const QDict *qdict,
> QObject **ret_data)
> {
> struct bdrv_iterate_context context = { mon, 0 };
>
> + if (incoming_expected && !incoming_done) {
> + autostart = 1;
Why do we need to set autostart? We should just fail if we're unable to run.
> + return 1; /* Waiting for incoming migration */
You should return -1 and use qerror_report(), so that we have a meaningful
error in the user Monitor and QMP (otherwise we'll get UndefinedError).
And incomding_done is not needed.
> + }
> bdrv_iterate(encrypted_bdrv_it, &context);
> /* only resume the vm if all keys are set and valid */
> if (!context.err) {
> diff --git a/sysemu.h b/sysemu.h
> index 9c988bb..f9c1962 100644
> --- a/sysemu.h
> +++ b/sysemu.h
> @@ -99,6 +99,7 @@ typedef enum DisplayType
> } DisplayType;
>
> extern int autostart;
> +extern int incoming_expected, incoming_done;
> extern int bios_size;
>
> typedef enum {
> diff --git a/vl.c b/vl.c
> index ba6ee11..b69c11b 100644
> --- a/vl.c
> +++ b/vl.c
> @@ -182,6 +182,8 @@ int nb_nics;
> NICInfo nd_table[MAX_NICS];
> int vm_running;
> int autostart;
> +int incoming_expected; /* Started with -incoming and waiting for incoming */
> +int incoming_done; /* Incoming migration successful */
> static int rtc_utc = 1;
> static int rtc_date_offset = -1; /* -1 means no change */
> QEMUClock *rtc_clock;
> @@ -2557,6 +2559,7 @@ int main(int argc, char **argv, char **envp)
> break;
> case QEMU_OPTION_incoming:
> incoming = optarg;
> + incoming_expected = true;
> break;
> case QEMU_OPTION_nodefaults:
> default_serial = 0;