Re: [PATCH v2 3/3] accel: Add xen CpusAccel using dummy-cpus

[Claudio Fontana <cfontana@xxxxxxx>]

On 10/13/20 4:05 PM, Jason Andryuk wrote:
> Xen was broken by commit 1583a3898853 ("cpus: extract out qtest-specific
> code to accel/qtest").  Xen relied on qemu_init_vcpu() calling
> qemu_dummy_start_vcpu() in the default case, but that was replaced by
> g_assert_not_reached().
> 
> Add a minimal "CpusAccel" for Xen using the dummy-cpus implementation
> used by qtest.
> 
> Signed-off-by: Jason Andryuk <jandryuk@xxxxxxxxx>
> ---
>  accel/meson.build   | 1 +
>  accel/xen/xen-all.c | 8 ++++++++
>  2 files changed, 9 insertions(+)
> 
> diff --git a/accel/meson.build b/accel/meson.build
> index 9a417396bd..b26cca227a 100644
> --- a/accel/meson.build
> +++ b/accel/meson.build
> @@ -12,3 +12,4 @@ dummy_ss.add(files(
>  ))
>  
>  specific_ss.add_all(when: ['CONFIG_SOFTMMU', 'CONFIG_POSIX'], if_true: 
> dummy_ss)
> +specific_ss.add_all(when: ['CONFIG_XEN'], if_true: dummy_ss)
> diff --git a/accel/xen/xen-all.c b/accel/xen/xen-all.c
> index 60b971d0a8..878a4089d9 100644
> --- a/accel/xen/xen-all.c
> +++ b/accel/xen/xen-all.c
> @@ -16,6 +16,7 @@
>  #include "hw/xen/xen_pt.h"
>  #include "chardev/char.h"
>  #include "sysemu/accel.h"
> +#include "sysemu/cpus.h"
>  #include "sysemu/xen.h"
>  #include "sysemu/runstate.h"
>  #include "migration/misc.h"
> @@ -153,6 +154,10 @@ static void xen_setup_post(MachineState *ms, AccelState 
> *accel)
>      }
>  }
>  
> +const CpusAccel xen_cpus = {
> +    .create_vcpu_thread = dummy_start_vcpu_thread,
> +};
> +
>  static int xen_init(MachineState *ms)
>  {
>      MachineClass *mc = MACHINE_GET_CLASS(ms);
> @@ -180,6 +185,9 @@ static int xen_init(MachineState *ms)
>       * opt out of system RAM being allocated by generic code
>       */
>      mc->default_ram_id = NULL;
> +
> +    cpus_register_accel(&xen_cpus);
> +
>      return 0;
>  }
>  
> 
Reviewed-by: Claudio Fontana <cfontana@xxxxxxx>