On Thu, 20 Mar 2008 17:25:26 +0100 Carsten Otte wrote: > From: Christian Borntraeger <borntraeger@xxxxxxxxxx> > From: Carsten Otte <cotte@xxxxxxxxxx> > > This patch adds functionality to detect if the kernel runs under the KVM > hypervisor. A macro MACHINE_IS_KVM is exported for device drivers. This > allows drivers to skip device detection if the systems runs non-virtualized. > We also define a preferred console to avoid having the ttyS0, which is a line > mode only console. > > Signed-off-by: Christian Borntraeger <borntraeger@xxxxxxxxxx> > Acked-by: Martin Schwidefsky <schwidefsky@xxxxxxxxxx> > Signed-off-by: Carsten Otte <cotte@xxxxxxxxxx> > --- > arch/s390/Kconfig | 7 +++++++ > arch/s390/kernel/early.c | 4 ++++ > arch/s390/kernel/setup.c | 10 +++++++--- > include/asm-s390/setup.h | 1 + > 4 files changed, 19 insertions(+), 3 deletions(-) > > Index: kvm/arch/s390/kernel/early.c > =================================================================== > --- kvm.orig/arch/s390/kernel/early.c > +++ kvm/arch/s390/kernel/early.c > @@ -143,6 +143,10 @@ static noinline __init void detect_machi > /* Running on a P/390 ? */ > if (cpuinfo->cpu_id.machine == 0x7490) > machine_flags |= 4; > + > + /* Running under KVM ? */ > + if (cpuinfo->cpu_id.version == 0xfe) Hi, Where are these magic numbers documented? (0x7490, 0xfe, etc.) > + machine_flags |= 64; > } > > #ifdef CONFIG_64BIT --- ~Randy _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/virtualization
