Am 09.10.2009 um 23:00 schrieb Hollis Blanchard holl...@us.ibm.com:
On Tue, 2009-09-29 at 10:17 +0200, Alexander Graf wrote:
Right now sregs is unused on PPC, so we can use it for initialization
of the CPU.
KVM on BookE always virtualizes the host CPU. On Book3s we go a
step further
and take the PVR from userspace that tells us what kind of CPU we
are supposed
to virtualize, because we support Book3s_32 and Book3s_64 guests.
In order to get that information, we use the sregs ioctl, because
we don't
want to reset the guest CPU on every normal register set.
Signed-off-by: Alexander Graf ag...@suse.de
---
arch/powerpc/include/asm/kvm.h |2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/arch/powerpc/include/asm/kvm.h b/arch/powerpc/include/
asm/kvm.h
index bb2de6a..b82bd68 100644
--- a/arch/powerpc/include/asm/kvm.h
+++ b/arch/powerpc/include/asm/kvm.h
@@ -46,6 +46,8 @@ struct kvm_regs {
};
struct kvm_sregs {
+__u64 pvr;
+char pad[1016];
};
struct kvm_fpu {
Architecturally, PVR is 32 bits, even for PPC64. Is there a reason you
want it to be 64 bits here? (I can understand just picking 64 for
registers that could be either size, but that's not this case.)
No obvious reason. It fills a registerwhich can be up to u64, but if
it's limited to u32 we can keep it 32 bits.
Alex
--
Hollis Blanchard
IBM Linux Technology Center
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