Not sure 44x needs it...
> -----Original Message----- > From: Liu Yu-B13201 > Sent: Monday, December 15, 2008 5:55 PM > To: [email protected] > Cc: Liu Yu-B13201 > Subject: [PATCH] Refresh TLB only when switch vcpu for powerpc > > Some work such as TLB put/load on E500 is not necessary at > every process switch, > which may take place frequently when host workload is heavy. > > This patch add a refresh interface for powerpc. > These kind of work can use it to refresh at vcpu switch. > > Signed-off-by: Liu Yu <[email protected]> > --- > arch/powerpc/include/asm/kvm_ppc.h | 1 + > arch/powerpc/kvm/e500.c | 7 +++++-- > arch/powerpc/kvm/e500_tlb.c | 10 ++++------ > arch/powerpc/kvm/e500_tlb.h | 3 +-- > arch/powerpc/kvm/powerpc.c | 9 +++++++++ > 5 files changed, 20 insertions(+), 10 deletions(-) > > diff --git a/arch/powerpc/include/asm/kvm_ppc.h > b/arch/powerpc/include/asm/kvm_ppc.h > index 82547c8..ac155a0 100644 > --- a/arch/powerpc/include/asm/kvm_ppc.h > +++ b/arch/powerpc/include/asm/kvm_ppc.h > @@ -76,6 +76,7 @@ extern int > kvmppc_core_vcpu_translate(struct kvm_vcpu *vcpu, > > extern void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu); > extern void kvmppc_core_vcpu_put(struct kvm_vcpu *vcpu); > +extern void kvmppc_core_vcpu_refresh(struct kvm_vcpu *vcpu, int cpu); > > extern void kvmppc_core_load_guest_debugstate(struct kvm_vcpu *vcpu); > extern void kvmppc_core_load_host_debugstate(struct kvm_vcpu *vcpu); > diff --git a/arch/powerpc/kvm/e500.c b/arch/powerpc/kvm/e500.c > index d0cdb06..13dfd46 100644 > --- a/arch/powerpc/kvm/e500.c > +++ b/arch/powerpc/kvm/e500.c > @@ -34,12 +34,15 @@ void > kvmppc_core_load_guest_debugstate(struct kvm_vcpu *vcpu) > > void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu) > { > - kvmppc_e500_tlb_load(vcpu, cpu); > } > > void kvmppc_core_vcpu_put(struct kvm_vcpu *vcpu) > { > - kvmppc_e500_tlb_put(vcpu); > +} > + > +void kvmppc_core_vcpu_refresh(struct kvm_vcpu *vcpu, int cpu) > +{ > + kvmppc_e500_tlb_refresh(vcpu, cpu); > } > > int kvmppc_core_check_processor_compat(void) > diff --git a/arch/powerpc/kvm/e500_tlb.c b/arch/powerpc/kvm/e500_tlb.c > index a5858e6..29c8c09 100644 > --- a/arch/powerpc/kvm/e500_tlb.c > +++ b/arch/powerpc/kvm/e500_tlb.c > @@ -129,11 +129,14 @@ static inline void > write_host_tlbe(struct kvmppc_vcpu_e500 *vcpu_e500, > local_irq_enable(); > } > > -void kvmppc_e500_tlb_load(struct kvm_vcpu *vcpu, int cpu) > +void kvmppc_e500_tlb_refresh(struct kvm_vcpu *vcpu, int cpu) > { > struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu); > int i; > unsigned register mas0; > + > + _tlbia(); > + > /* Mark every guest entry in the shadow TLB entry > modified, so that they > * will all be reloaded on the next vcpu run (instead of being > * demand-faulted). */ > @@ -152,11 +155,6 @@ void kvmppc_e500_tlb_load(struct > kvm_vcpu *vcpu, int cpu) > local_irq_enable(); > } > > -void kvmppc_e500_tlb_put(struct kvm_vcpu *vcpu) > -{ > - _tlbia(); > -} > - > /* Search the guest TLB for a matching entry. */ > static int e500_tlb_index(struct kvmppc_vcpu_e500 > *vcpu_e500, gva_t eaddr, > int tlbsel, unsigned int pid, int as) > diff --git a/arch/powerpc/kvm/e500_tlb.h b/arch/powerpc/kvm/e500_tlb.h > index fed42e5..61e2ac4 100644 > --- a/arch/powerpc/kvm/e500_tlb.h > +++ b/arch/powerpc/kvm/e500_tlb.h > @@ -48,8 +48,7 @@ extern int kvmppc_e500_emul_tlbre(struct > kvm_vcpu *); > extern int kvmppc_e500_emul_tlbivax(struct kvm_vcpu *, int, int); > extern int kvmppc_e500_emul_tlbsx(struct kvm_vcpu *, int); > extern int kvmppc_e500_tlb_search(struct kvm_vcpu *, gva_t, int); > -extern void kvmppc_e500_tlb_put(struct kvm_vcpu *); > -extern void kvmppc_e500_tlb_load(struct kvm_vcpu *, int); > +extern void kvmppc_e500_tlb_refresh(struct kvm_vcpu *, int); > extern int kvmppc_e500_tlb_init(struct kvmppc_vcpu_e500 *); > extern void kvmppc_e500_tlb_uninit(struct kvmppc_vcpu_e500 *); > extern void kvmppc_e500_tlb_setup(struct kvmppc_vcpu_e500 *); > diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c > index fd84d9c..a7a92e7 100644 > --- a/arch/powerpc/kvm/powerpc.c > +++ b/arch/powerpc/kvm/powerpc.c > @@ -30,6 +30,8 @@ > #include <asm/tlbflush.h> > #include "timing.h" > > +static DEFINE_PER_CPU(struct kvm_vcpu *, last_vcpu) = NULL; > + > gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn) > { > return gfn; > @@ -215,6 +217,7 @@ int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) > void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) > { > kvmppc_mmu_destroy(vcpu); > + __get_cpu_var(last_vcpu) = NULL; > } > > void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) > @@ -223,6 +226,12 @@ void kvm_arch_vcpu_load(struct kvm_vcpu > *vcpu, int cpu) > kvmppc_core_load_guest_debugstate(vcpu); > > kvmppc_core_vcpu_load(vcpu, cpu); > + > + /* Refresh work can be done only when switch vcpu */ > + if (__get_cpu_var(last_vcpu) != vcpu) { > + kvmppc_core_vcpu_refresh(vcpu, cpu); > + __get_cpu_var(last_vcpu) = vcpu; > + } > } > > void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) > -- > 1.5.4 > > -- To unsubscribe from this list: send the line "unsubscribe kvm-ppc" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
