Re: [Qemu-devel] [Xen-devel] [PATCH 1/2] Allow use of pc machine type (accel=xen) for Xen HVM domains.

[Stefano Stabellini]

On Tue, 18 Jun 2013, Paul Durrant wrote:
> Xen HVM domains normally spawn QEMU with a dedicated xenfv machine type. The
> initialization code for this machine type can easily be pulled into the
> generic pc initialization code and guarded with a test for whether the xen
> accelerator options is specified, which is more consistent with the way
> other accelerators are used.
> 
> Signed-off-by: Paul Durrant <address@hidden>
> ---
>  hw/i386/pc_piix.c |    8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)
> 
> diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
> index d618570..f96e0c2 100644
> --- a/hw/i386/pc_piix.c
> +++ b/hw/i386/pc_piix.c
> @@ -91,6 +91,11 @@ static void pc_init1(MemoryRegion *system_memory,
>      DeviceState *icc_bridge;
>      FWCfgState *fw_cfg = NULL;
>  
> +    if (xen_enabled() && xen_hvm_init() != 0) {
> +        fprintf(stderr, "xen hardware virtual machine initialisation 
> failed\n");
> +        exit(1);
> +    }
> +
>      icc_bridge = qdev_create(NULL, TYPE_ICC_BRIDGE);
>      object_property_add_child(qdev_get_machine(), "icc-bridge",
>                                OBJECT(icc_bridge), NULL);

I was about to submit a pull request with this patch, but unfortunately
it breaks non-xen compilations:

hw/i386/pc_piix.o: In function `pc_init1':
/local/scratch/sstabellini/qemu/hw/i386/pc_piix.c:94: undefined reference to 
`xen_hvm_init'

you need to add the function to xen-stub.c:

diff --git a/xen-stub.c b/xen-stub.c
index 6f0516a..47c8e73 100644
--- a/xen-stub.c
+++ b/xen-stub.c
@@ -63,3 +63,8 @@ void qmp_xen_set_global_dirty_log(bool enable, Error **errp)
 void xen_modified_memory(ram_addr_t start, ram_addr_t length)
 {
 }
+
+int xen_hvm_init(void)
+{
+    return 0;
+}

I'll include this change in the pull request