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s390: KVM guest: detect when running on kvm

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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@de.ibm.com>
Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Carsten Otte 2008-03-25 18:47:44 +01:00 • committed by Avi Kivity
parent 85f8fffe3c
commit fa5877439d
4 changed files with 19 additions and 3 deletions
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4
arch/s390/kernel/early.c
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@ -144,6 +144,10 @@ static noinline __init void detect_machine_type(void)
/* Running on a P/390 ? */
if (cpuinfo->cpu_id.machine == 0x7490)
machine_flags |= 4;
/* Running under KVM ? */
if (cpuinfo->cpu_id.version == 0xfe)
machine_flags |= 64;
}
#ifdef CONFIG_64BIT