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KVM: PPC: Disable MSR_FEx for Cell hosts

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Cell can't handle MSR_FE0 and MSR_FE1 too well. It gets dog slow.
So let's just override the guest whenever we see one of the two and mask them
out. See commit ddf5f75a16 for reference.

Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Alexander Graf 2010-03-24 21:48:37 +01:00 committed by Avi Kivity
parent 3ed9c6d2b5
commit 05b0ab1c0b
1 changed files with 4 additions and 0 deletions
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4
arch/powerpc/kvm/book3s.c
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@ -357,6 +357,10 @@ void kvmppc_set_pvr(struct kvm_vcpu *vcpu, u32 pvr)
!strcmp(cur_cpu_spec->platform, "ppc970"))
vcpu->arch.hflags |= BOOK3S_HFLAG_DCBZ32;
/* Cell performs badly if MSR_FEx are set. So let's hope nobody
really needs them in a VM on Cell and force disable them. */
if (!strcmp(cur_cpu_spec->platform, "ppc-cell-be"))
to_book3s(vcpu)->msr_mask &= ~(MSR_FE0 | MSR_FE1);
}
/* Book3s_32 CPUs always have 32 bytes cache line size, which Linux assumes. To