On 04/07/2017 10:28, Daniel P. Berrange wrote:
>> +supported_kvm_target() {
>> + test "$kvm" = "yes" || return 1
>> + glob "$1" "*-softmmu" || return 1
>> + case "${1%-softmmu}:$cpu" in
>> + arm:arm | aarch64:aarch64 | \
>> + i386:i386 | i386:x86_64 | i386:x32 | \
>> + x86_64:i386 | x86_64:x86_64 | x86_64:x32 | \
>
> IIUC, 'x86_64:i386' is claiming that you can run x86_64
> KVM guests on an i386 host. I thought that was impossible,
> only 32-on-64 being allowed not 64-on-32.
You can use qemu-system-x86_64 to run i386 KVM guests, by disabling long
mode with -cpu. It's not a common scenario though.
>> + mips:mips | mipsel:mips | \
>> + ppc:ppc | ppcemb:ppc | ppc64:ppc | \
>> + ppc:ppc64 | ppcemb:ppc64 | ppc64:ppc64 | \
>
> Same question here with ppc64:ppc suggesting you can
> run 64-bit guest with KVM on a 32-bit host ?
I'm not sure about this one, but right now it is allowed so this patch
is not changing anything.
>> + s390x:s390x)
>> + return 0
>> + ;;
>> + esac
>> + return 1
>> +}
>> +
>> +supported_xen_target() {
>> + test "$xen" = "yes" || return 1
>> + glob "$1" "*-softmmu" || return 1
>> + case "${1%-softmmu}:$cpu" in
>> + arm:arm | aarch64:aarch64 | \
>> + i386:i386 | i386:x86_64 | x86_64:i386 | x86_64:x86_64)
> This again is claiming support for 64-bit guests with Xen on a
> 32-bit host, which AFAIK is impossible.
32-bit dom0 with 64-bit guests actually is not only possible, but also
widely used.
Paolo
