diff options
| author | Paul Mackerras <paulus@samba.org> | 2011-12-15 06:02:47 +0400 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2012-03-05 16:52:39 +0400 |
| commit | 55514893739d28f095f19b012133eea4cb4a9390 (patch) | |
| tree | 53133098473395a8a4ff1f00414137c2481a5fd0 /arch/powerpc/kvm/book3s_hv_rm_mmu.c | |
| parent | bad3b5075eeb18cb1641b4171618add638bc0fa7 (diff) | |
| download | linux-55514893739d28f095f19b012133eea4cb4a9390.tar.xz | |
KVM: PPC: Book3S HV: Use the hardware referenced bit for kvm_age_hva
This uses the host view of the hardware R (referenced) bit to speed
up kvm_age_hva() and kvm_test_age_hva(). Instead of removing all
the relevant HPTEs in kvm_age_hva(), we now just reset their R bits
if set. Also, kvm_test_age_hva() now scans the relevant HPTEs to
see if any of them have R set.
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/powerpc/kvm/book3s_hv_rm_mmu.c')
| -rw-r--r-- | arch/powerpc/kvm/book3s_hv_rm_mmu.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/arch/powerpc/kvm/book3s_hv_rm_mmu.c b/arch/powerpc/kvm/book3s_hv_rm_mmu.c index 91b45a03f438..5f3c60b89faf 100644 --- a/arch/powerpc/kvm/book3s_hv_rm_mmu.c +++ b/arch/powerpc/kvm/book3s_hv_rm_mmu.c @@ -641,6 +641,25 @@ void kvmppc_invalidate_hpte(struct kvm *kvm, unsigned long *hptep, } EXPORT_SYMBOL_GPL(kvmppc_invalidate_hpte); +void kvmppc_clear_ref_hpte(struct kvm *kvm, unsigned long *hptep, + unsigned long pte_index) +{ + unsigned long rb; + unsigned char rbyte; + + rb = compute_tlbie_rb(hptep[0], hptep[1], pte_index); + rbyte = (hptep[1] & ~HPTE_R_R) >> 8; + /* modify only the second-last byte, which contains the ref bit */ + *((char *)hptep + 14) = rbyte; + while (!try_lock_tlbie(&kvm->arch.tlbie_lock)) + cpu_relax(); + asm volatile(PPC_TLBIE(%1,%0)"; eieio; tlbsync" + : : "r" (rb), "r" (kvm->arch.lpid)); + asm volatile("ptesync" : : : "memory"); + kvm->arch.tlbie_lock = 0; +} +EXPORT_SYMBOL_GPL(kvmppc_clear_ref_hpte); + static int slb_base_page_shift[4] = { 24, /* 16M */ 16, /* 64k */ |