Re: [PATCH v6 16/36] multi-process: remote process initialization

[Elena Ufimtseva <elena.ufimtseva@oracle.com>]

On Thu, Apr 09, 2020 at 07:00:02PM +0100, Dr. David Alan Gilbert wrote:
> * elena.ufimtseva@oracle.com (elena.ufimtseva@oracle.com) wrote:
> > From: Jagannathan Raman <jag.raman@oracle.com>
> > 
> > Adds the handler to process message from QEMU,
> > Initialize remote process main loop, handles SYNC_SYSMEM
> > message by updating its "system_memory" container using
> > shared file descriptors received from QEMU.
> > 
> > Signed-off-by: John G Johnson <john.g.johnson@oracle.com>
> > Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com>
> > Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
> > ---
> >  remote/remote-main.c | 87 ++++++++++++++++++++++++++++++++++++++++++++
> >  1 file changed, 87 insertions(+)
> > 
> > diff --git a/remote/remote-main.c b/remote/remote-main.c
> > index ecf30e0cba..51595f3141 100644
> > --- a/remote/remote-main.c
> > +++ b/remote/remote-main.c
> > @@ -12,6 +12,7 @@
> >  #include "qemu-common.h"
> >  
> >  #include <stdio.h>
> > +#include <unistd.h>
> >  
> >  #include "qemu/module.h"
> >  #include "remote/pcihost.h"
> > @@ -19,12 +20,98 @@
> >  #include "hw/boards.h"
> >  #include "hw/qdev-core.h"
> >  #include "qemu/main-loop.h"
> > +#include "remote/memory.h"
> > +#include "io/mpqemu-link.h"
> > +#include "qapi/error.h"
> > +#include "qemu/main-loop.h"
> > +#include "sysemu/cpus.h"
> > +#include "qemu-common.h"
> > +#include "hw/pci/pci.h"
> > +#include "qemu/thread.h"
> > +#include "qemu/main-loop.h"
> > +#include "qemu/config-file.h"
> > +#include "sysemu/sysemu.h"
> > +#include "block/block.h"
> > +#include "exec/ramlist.h"
> > +
> > +static MPQemuLinkState *mpqemu_link;
> > +
> > +static void process_msg(GIOCondition cond, MPQemuLinkState *link,
> > +                        MPQemuChannel *chan)
> > +{
> > +    MPQemuMsg *msg = NULL;
> > +    Error *err = NULL;
> > +
> > +    if ((cond & G_IO_HUP) || (cond & G_IO_ERR)) {
> > +        goto finalize_loop;
> > +    }
> > +
> > +    msg = g_malloc0(sizeof(MPQemuMsg));
> > +
> > +    if (mpqemu_msg_recv(msg, chan) < 0) {
> > +        error_setg(&err, "Failed to receive message");
> > +        goto finalize_loop;
> > +    }
> > +
> > +    switch (msg->cmd) {
> > +    case INIT:
> > +        break;
> > +    default:
> > +        error_setg(&err, "Unknown command");
> 
> Again this doesn't seem to have changed since my 4th March review where
> I asked for better error messages.
>

Hi Dave

Apologies, we have omitted it (and other patches you have commented on).
We will re-send the series with these addressed shortly plus the test build error fix.

Elena
> Dave
> 
> > +        goto finalize_loop;
> > +    }
> > +
> > +    g_free(msg->data2);
> > +    g_free(msg);
> > +
> > +    return;
> > +
> > +finalize_loop:
> > +    if (err) {
> > +        error_report_err(err);
> > +    }
> > +    g_free(msg);
> > +    mpqemu_link_finalize(mpqemu_link);
> > +    mpqemu_link = NULL;
> > +}
> >  
> >  int main(int argc, char *argv[])
> >  {
> > +    Error *err = NULL;
> > +
> >      module_call_init(MODULE_INIT_QOM);
> >  
> > +    bdrv_init_with_whitelist();
> > +
> > +    if (qemu_init_main_loop(&err)) {
> > +        error_report_err(err);
> > +        return -EBUSY;
> > +    }
> > +
> > +    qemu_init_cpu_loop();
> > +
> > +    page_size_init();
> > +
> > +    qemu_mutex_init(&ram_list.mutex);
> > +
> >      current_machine = MACHINE(REMOTE_MACHINE(object_new(TYPE_REMOTE_MACHINE)));
> >  
> > +    mpqemu_link = mpqemu_link_create();
> > +    if (!mpqemu_link) {
> > +        printf("Could not create MPQemu link\n");
> > +        return -1;
> > +    }
> > +
> > +    mpqemu_init_channel(mpqemu_link, &mpqemu_link->com, STDIN_FILENO);
> > +
> > +    mpqemu_link_set_callback(mpqemu_link, process_msg);
> > +
> > +    qdev_machine_creation_done();
> > +    qemu_mutex_lock_iothread();
> > +    qemu_run_machine_init_done_notifiers();
> > +    qemu_mutex_unlock_iothread();
> > +
> > +    mpqemu_start_coms(mpqemu_link, mpqemu_link->com);
> > +
> >      return 0;
> >  }
> > -- 
> > 2.25.GIT
> > 
> --
> Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
>