On Thu, Aug 07, 2025 at 04:39:51PM +0200, Magnus Kulke wrote:
> From: Praveen K Paladugu <pra...@microsoft.com>
>
> Allow to query mshv capabilities via query-mshv QMP command.
>
> Signed-off-by: Praveen K Paladugu <pra...@linux.microsoft.com>
> Signed-off-by: Magnus Kulke <magnusku...@linux.microsoft.com>
> ---
> hw/core/machine-qmp-cmds.c | 14 ++++++++++++++
> qapi/accelerator.json | 29 +++++++++++++++++++++++++++++
> 2 files changed, 43 insertions(+)
>
> diff --git a/hw/core/machine-qmp-cmds.c b/hw/core/machine-qmp-cmds.c
> index 6aca1a626e..024ddb8d2d 100644
> --- a/hw/core/machine-qmp-cmds.c
> +++ b/hw/core/machine-qmp-cmds.c
> @@ -28,6 +28,20 @@
> #include "system/runstate.h"
> #include "system/system.h"
> #include "hw/s390x/storage-keys.h"
> +#include <sys/stat.h>
> +
> +/*
> + * QMP query for MSHV
> + */
> +MshvInfo *qmp_query_mshv(Error **errp)
> +{
> + MshvInfo *info = g_malloc0(sizeof(*info));
> + struct stat st;
> +
> + info->present = accel_find("mshv");
> + info->enabled = (stat("/dev/mshv", &st) == 0);
I don't think this is the right way to check if MSHV is _enabled_. The
device node being around doesn't necessarily mean that QEMU is using it.
You can refer to kvm_enabled() to see how it is implemented.
Some functions that are of interest:
do_configure_accelerator
accel_init_machine
Thanks,
Wei
