Re: [Qemu-devel] [PATCH 1/2] Move KVM init to arch_init.c, compile vl.c once

[Anthony Liguori]

On 04/01/2010 03:07 PM, Blue Swirl wrote:
> Remove dependency of vl.c to KVM, then we can partially revert
> b33612d03540fda7fa67485f1c20395beb7a2bf0.
>
> Signed-off-by: Blue Swirl<address@hidden>
> ---
>   Makefile.objs   |    2 +-
>   Makefile.target |    2 +-
>   arch_init.c     |   20 ++++++++++++++++++++
>   arch_init.h     |    2 ++
>   vl.c            |   14 ++------------
>   5 files changed, 26 insertions(+), 14 deletions(-)
>
> diff --git a/Makefile.objs b/Makefile.objs
> index 74d7a3d..4cc8ea6 100644
> --- a/Makefile.objs
> +++ b/Makefile.objs
> @@ -128,7 +128,7 @@ user-obj-y += cutils.o cache-utils.o
>   # libhw
>
>   hw-obj-y =
> -hw-obj-y += loader.o
> +hw-obj-y += vl.o loader.o
>   hw-obj-y += virtio.o virtio-console.o
>   hw-obj-y += fw_cfg.o pci.o pci_host.o pcie_host.o
>   hw-obj-y += watchdog.o
> diff --git a/Makefile.target b/Makefile.target
> index 167fc8d..2aa02f5 100644
> --- a/Makefile.target
> +++ b/Makefile.target
> @@ -161,7 +161,7 @@ endif #CONFIG_BSD_USER
>   # System emulator target
>   ifdef CONFIG_SOFTMMU
>
> -obj-y = arch_init.o cpus.o monitor.o machine.o gdbstub.o vl.o
> +obj-y = arch_init.o cpus.o monitor.o machine.o gdbstub.o
>   # virtio has to be here due to weird dependency between PCI and virtio-net.
>   # need to fix this properly
>   obj-y += virtio-blk.o virtio-balloon.o virtio-net.o virtio-pci.o
> virtio-serial-bus.o
> diff --git a/arch_init.c b/arch_init.c
> index cfc03ea..001c560 100644
> --- a/arch_init.c
> +++ b/arch_init.c
> @@ -41,6 +41,8 @@
>   #include "gdbstub.h"
>   #include "hw/smbios.h"
>
> +int kvm_allowed = 0;
> +
>   #ifdef TARGET_SPARC
>   int graphic_width = 1024;
>   int graphic_height = 768;
> @@ -508,3 +510,21 @@ int xen_available(void)
>       return 0;
>   #endif
>   }
> +
> +void enable_kvm(void)
> +{
> +    kvm_allowed = 1;
> +}
>    

Can we get away with keeping a local to vl.c use_kvm flag and then call 
kvm_init() if use_kvm in vl.c?

We can stick a stub kvm_init() in arch_init.c if !CONFIG_KVM.

Regards,

Anthony LIguori

> +void kvm_maybe_init(int smp_cpus)
> +{
> +    if (kvm_enabled()) {
> +        int ret;
> +
> +        ret = kvm_init(smp_cpus);
> +        if (ret<  0) {
> +            fprintf(stderr, "failed to initialize KVM\n");
> +            exit(1);
> +        }
> +    }
> +}
> diff --git a/arch_init.h b/arch_init.h
> index 682890c..dde4309 100644
> --- a/arch_init.h
> +++ b/arch_init.h
> @@ -29,5 +29,7 @@ void cpudef_init(void);
>   int audio_available(void);
>   int kvm_available(void);
>   int xen_available(void);
> +void enable_kvm(void);
> +void kvm_maybe_init(int smp_cpus);
>
>   #endif
> diff --git a/vl.c b/vl.c
> index 03fccbf..cc214dd 100644
> --- a/vl.c
> +++ b/vl.c
> @@ -145,7 +145,6 @@ int main(int argc, char **argv)
>   #include "dma.h"
>   #include "audio/audio.h"
>   #include "migration.h"
> -#include "kvm.h"
>   #include "balloon.h"
>   #include "qemu-option.h"
>   #include "qemu-config.h"
> @@ -241,7 +240,6 @@ uint8_t qemu_uuid[16];
>   static QEMUBootSetHandler *boot_set_handler;
>   static void *boot_set_opaque;
>
> -int kvm_allowed = 0;
>   uint32_t xen_domid;
>   enum xen_mode xen_mode = XEN_EMULATE;
>
> @@ -3228,7 +3226,7 @@ int main(int argc, char **argv, char **envp)
>                       printf("Option %s not supported for this
> target\n", popt->name);
>                       exit(1);
>                   }
> -                kvm_allowed = 1;
> +                enable_kvm();
>                   break;
>               case QEMU_OPTION_usb:
>                   usb_enabled = 1;
> @@ -3574,15 +3572,7 @@ int main(int argc, char **argv, char **envp)
>           exit(1);
>       }
>
> -    if (kvm_enabled()) {
> -        int ret;
> -
> -        ret = kvm_init(smp_cpus);
> -        if (ret<  0) {
> -            fprintf(stderr, "failed to initialize KVM\n");
> -            exit(1);
> -        }
> -    }
> +    kvm_maybe_init(smp_cpus);
>
>       if (qemu_init_main_loop()) {
>           fprintf(stderr, "qemu_init_main_loop failed\n");
>