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| author | Hollis Blanchard <hollisb@us.ibm.com> | 2008-07-25 20:54:52 +0200 |
|---|---|---|
| committer | Avi Kivity <avi@qumranet.com> | 2008-10-15 10:15:16 +0200 |
| commit | 83aae4a8098eb8a40a2e9dab3714354182143b4f (patch) | |
| tree | 872381c8aa610e3c1053008e967728f121fa55cb /arch/powerpc/kvm/44x_tlb.c | |
| parent | KVM: ppc: Stop saving host TLB state (diff) | |
| download | linux-83aae4a8098eb8a40a2e9dab3714354182143b4f.tar.xz linux-83aae4a8098eb8a40a2e9dab3714354182143b4f.zip | |
KVM: ppc: Write only modified shadow entries into the TLB on exit
Track which TLB entries need to be written, instead of overwriting everything
below the high water mark. Typically only a single guest TLB entry will be
modified in a single exit.
Guest boot time performance improvement: about 15%.
Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'arch/powerpc/kvm/44x_tlb.c')
| -rw-r--r-- | arch/powerpc/kvm/44x_tlb.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/arch/powerpc/kvm/44x_tlb.c b/arch/powerpc/kvm/44x_tlb.c index a207d16b9dbb..06a5fcfc4d33 100644 --- a/arch/powerpc/kvm/44x_tlb.c +++ b/arch/powerpc/kvm/44x_tlb.c @@ -125,6 +125,11 @@ static void kvmppc_44x_shadow_release(struct kvm_vcpu *vcpu, } } +void kvmppc_tlbe_set_modified(struct kvm_vcpu *vcpu, unsigned int i) +{ + vcpu->arch.shadow_tlb_mod[i] = 1; +} + /* Caller must ensure that the specified guest TLB entry is safe to insert into * the shadow TLB. */ void kvmppc_mmu_map(struct kvm_vcpu *vcpu, u64 gvaddr, gfn_t gfn, u64 asid, @@ -172,10 +177,10 @@ void kvmppc_mmu_map(struct kvm_vcpu *vcpu, u64 gvaddr, gfn_t gfn, u64 asid, * use host large pages in the future. */ stlbe->word0 = (gvaddr & PAGE_MASK) | PPC44x_TLB_VALID | PPC44x_TLB_TS | PPC44x_TLB_4K; - stlbe->word1 = (hpaddr & 0xfffffc00) | ((hpaddr >> 32) & 0xf); stlbe->word2 = kvmppc_44x_tlb_shadow_attrib(flags, vcpu->arch.msr & MSR_PR); + kvmppc_tlbe_set_modified(vcpu, victim); KVMTRACE_5D(STLB_WRITE, vcpu, victim, stlbe->tid, stlbe->word0, stlbe->word1, stlbe->word2, @@ -209,6 +214,7 @@ void kvmppc_mmu_invalidate(struct kvm_vcpu *vcpu, gva_t eaddr, kvmppc_44x_shadow_release(vcpu, i); stlbe->word0 = 0; + kvmppc_tlbe_set_modified(vcpu, i); KVMTRACE_5D(STLB_INVAL, vcpu, i, stlbe->tid, stlbe->word0, stlbe->word1, stlbe->word2, handler); @@ -229,6 +235,7 @@ void kvmppc_mmu_priv_switch(struct kvm_vcpu *vcpu, int usermode) kvmppc_44x_shadow_release(vcpu, i); stlbe->word0 = 0; + kvmppc_tlbe_set_modified(vcpu, i); KVMTRACE_5D(STLB_INVAL, vcpu, i, stlbe->tid, stlbe->word0, stlbe->word1, stlbe->word2, handler); |