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 ddf5f75a16b3e7460ffee881795aa168dffcd0cf for reference.
Signed-off-by: Alexander Graf <ag...@suse.de>
---
arch/powerpc/kvm/book3s.c | 4 ++++
1 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
index 1a12ef2..a7ab2ea 100644
--- a/arch/powerpc/kvm/book3s.c
+++ b/arch/powerpc/kvm/book3s.c
@@ -356,6 +356,10 @@ 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
--
1.6.0.2
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