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| author | Alexander Graf <agraf@suse.de> | 2010-04-20 00:49:48 (GMT) |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2010-05-17 09:18:58 (GMT) |
| commit | f7bc74e1c306636a659a04805474b2f8fcbd1f7e (patch) | |
| tree | 5aa5c5c9676d577b55bbc700f1d5a6ee5c137a27 /arch/powerpc/kvm/book3s_64_mmu.c | |
| parent | 7fdaec997cc8ef77e8da7ed70f3d9f074b61c31f (diff) | |
| download | linux-f7bc74e1c306636a659a04805474b2f8fcbd1f7e.tar.xz | |
KVM: PPC: Improve split mode
When in split mode, instruction relocation and data relocation are not equal.
So far we implemented this mode by reserving a special pseudo-VSID for the
two cases and flushing all PTEs when going into split mode, which is slow.
Unfortunately 32bit Linux and Mac OS X use split mode extensively. So to not
slow down things too much, I came up with a different idea: Mark the split
mode with a bit in the VSID and then treat it like any other segment.
This means we can just flush the shadow segment cache, but keep the PTEs
intact. I verified that this works with ppc32 Linux and Mac OS X 10.4
guests and does speed them up.
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/powerpc/kvm/book3s_64_mmu.c')
| -rw-r--r-- | arch/powerpc/kvm/book3s_64_mmu.c | 27 |
1 files changed, 15 insertions, 12 deletions
diff --git a/arch/powerpc/kvm/book3s_64_mmu.c b/arch/powerpc/kvm/book3s_64_mmu.c index a9241e9..612de6e 100644 --- a/arch/powerpc/kvm/book3s_64_mmu.c +++ b/arch/powerpc/kvm/book3s_64_mmu.c @@ -442,29 +442,32 @@ static void kvmppc_mmu_book3s_64_tlbie(struct kvm_vcpu *vcpu, ulong va, static int kvmppc_mmu_book3s_64_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid, u64 *vsid) { + ulong ea = esid << SID_SHIFT; + struct kvmppc_slb *slb; + u64 gvsid = esid; + + if (vcpu->arch.msr & (MSR_DR|MSR_IR)) { + slb = kvmppc_mmu_book3s_64_find_slbe(to_book3s(vcpu), ea); + if (slb) + gvsid = slb->vsid; + } + switch (vcpu->arch.msr & (MSR_DR|MSR_IR)) { case 0: - *vsid = (VSID_REAL >> 16) | esid; + *vsid = VSID_REAL | esid; break; case MSR_IR: - *vsid = (VSID_REAL_IR >> 16) | esid; + *vsid = VSID_REAL_IR | gvsid; break; case MSR_DR: - *vsid = (VSID_REAL_DR >> 16) | esid; + *vsid = VSID_REAL_DR | gvsid; break; case MSR_DR|MSR_IR: - { - ulong ea; - struct kvmppc_slb *slb; - ea = esid << SID_SHIFT; - slb = kvmppc_mmu_book3s_64_find_slbe(to_book3s(vcpu), ea); - if (slb) - *vsid = slb->vsid; - else + if (!slb) return -ENOENT; + *vsid = gvsid; break; - } default: BUG(); break; |