| Message ID | 20230722022251.3446223-5-rananta@google.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | KVM: arm64: Add support for FEAT_TLBIRANGE | expand |
On Sat, Jul 22, 2023, Raghavendra Rao Ananta wrote: > diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c > index ec169f5c7dce..eb88d25f9896 100644 > --- a/arch/x86/kvm/mmu/mmu.c > +++ b/arch/x86/kvm/mmu/mmu.c > @@ -278,16 +278,15 @@ static inline bool kvm_available_flush_remote_tlbs_range(void) > return kvm_x86_ops.flush_remote_tlbs_range; > } > > -void kvm_flush_remote_tlbs_range(struct kvm *kvm, gfn_t start_gfn, > - gfn_t nr_pages) > +int kvm_arch_flush_remote_tlbs_range(struct kvm *kvm, gfn_t start_gfn, u64 pages) Please keep "nr_pages", I have a very strong preference for that over just "pages" as the "nr_" makes it super obvious that it's a single number, as opposed to an array of pages or something. And it doesn't truly matter, but IMO the gfn_t type is more appropriate since the gfn and the number of pages need to have the same type.
On Mon, Jul 31, 2023 at 2:55 PM Sean Christopherson <seanjc@google.com> wrote: > > On Sat, Jul 22, 2023, Raghavendra Rao Ananta wrote: > > diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c > > index ec169f5c7dce..eb88d25f9896 100644 > > --- a/arch/x86/kvm/mmu/mmu.c > > +++ b/arch/x86/kvm/mmu/mmu.c > > @@ -278,16 +278,15 @@ static inline bool kvm_available_flush_remote_tlbs_range(void) > > return kvm_x86_ops.flush_remote_tlbs_range; > > } > > > > -void kvm_flush_remote_tlbs_range(struct kvm *kvm, gfn_t start_gfn, > > - gfn_t nr_pages) > > +int kvm_arch_flush_remote_tlbs_range(struct kvm *kvm, gfn_t start_gfn, u64 pages) > > Please keep "nr_pages", I have a very strong preference for that over just "pages" > as the "nr_" makes it super obvious that it's a single number, as opposed to an > array of pages or something. > Sure, I'll revert back to 'nr_pages'. - Raghavendra > And it doesn't truly matter, but IMO the gfn_t type is more appropriate since > the gfn and the number of pages need to have the same type.
On Sat, Jul 22, 2023 at 7:52 AM Raghavendra Rao Ananta <rananta@google.com> wrote: > > From: David Matlack <dmatlack@google.com> > > Make kvm_flush_remote_tlbs_range() visible in common code and create a > default implementation that just invalidates the whole TLB. > > This paves the way for several future features/cleanups: > > - Introduction of range-based TLBI on ARM. > - Eliminating kvm_arch_flush_remote_tlbs_memslot() > - Moving the KVM/x86 TDP MMU to common code. > > No functional change intended. > > Signed-off-by: David Matlack <dmatlack@google.com> > Signed-off-by: Raghavendra Rao Ananta <rananta@google.com> > Reviewed-by: Gavin Shan <gshan@redhat.com> > Reviewed-by: Shaoqin Huang <shahuang@redhat.com> For KVM RISC-V: Reviewed-by: Anup Patel <anup@brainfault.org> Regards, Anup > --- > arch/x86/include/asm/kvm_host.h | 3 +++ > arch/x86/kvm/mmu/mmu.c | 9 ++++----- > arch/x86/kvm/mmu/mmu_internal.h | 3 --- > include/linux/kvm_host.h | 9 +++++++++ > virt/kvm/kvm_main.c | 13 +++++++++++++ > 5 files changed, 29 insertions(+), 8 deletions(-) > > diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h > index a2d3cfc2eb75..08900afbf2ad 100644 > --- a/arch/x86/include/asm/kvm_host.h > +++ b/arch/x86/include/asm/kvm_host.h > @@ -1804,6 +1804,9 @@ static inline int kvm_arch_flush_remote_tlbs(struct kvm *kvm) > return -ENOTSUPP; > } > > +#define __KVM_HAVE_ARCH_FLUSH_REMOTE_TLBS_RANGE > +int kvm_arch_flush_remote_tlbs_range(struct kvm *kvm, gfn_t start_gfn, u64 pages); > + > #define kvm_arch_pmi_in_guest(vcpu) \ > ((vcpu) && (vcpu)->arch.handling_intr_from_guest) > > diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c > index ec169f5c7dce..eb88d25f9896 100644 > --- a/arch/x86/kvm/mmu/mmu.c > +++ b/arch/x86/kvm/mmu/mmu.c > @@ -278,16 +278,15 @@ static inline bool kvm_available_flush_remote_tlbs_range(void) > return kvm_x86_ops.flush_remote_tlbs_range; > } > > -void kvm_flush_remote_tlbs_range(struct kvm *kvm, gfn_t start_gfn, > - gfn_t nr_pages) > +int kvm_arch_flush_remote_tlbs_range(struct kvm *kvm, gfn_t start_gfn, u64 pages) > { > int ret = -EOPNOTSUPP; > > if (kvm_x86_ops.flush_remote_tlbs_range) > ret = static_call(kvm_x86_flush_remote_tlbs_range)(kvm, start_gfn, > - nr_pages); > - if (ret) > - kvm_flush_remote_tlbs(kvm); > + pages); > + > + return ret; > } > > static gfn_t kvm_mmu_page_get_gfn(struct kvm_mmu_page *sp, int index); > diff --git a/arch/x86/kvm/mmu/mmu_internal.h b/arch/x86/kvm/mmu/mmu_internal.h > index d39af5639ce9..86cb83bb3480 100644 > --- a/arch/x86/kvm/mmu/mmu_internal.h > +++ b/arch/x86/kvm/mmu/mmu_internal.h > @@ -170,9 +170,6 @@ bool kvm_mmu_slot_gfn_write_protect(struct kvm *kvm, > struct kvm_memory_slot *slot, u64 gfn, > int min_level); > > -void kvm_flush_remote_tlbs_range(struct kvm *kvm, gfn_t start_gfn, > - gfn_t nr_pages); > - > /* Flush the given page (huge or not) of guest memory. */ > static inline void kvm_flush_remote_tlbs_gfn(struct kvm *kvm, gfn_t gfn, int level) > { > diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h > index e3f968b38ae9..a731967b24ff 100644 > --- a/include/linux/kvm_host.h > +++ b/include/linux/kvm_host.h > @@ -1359,6 +1359,7 @@ int kvm_vcpu_yield_to(struct kvm_vcpu *target); > void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu, bool yield_to_kernel_mode); > > void kvm_flush_remote_tlbs(struct kvm *kvm); > +void kvm_flush_remote_tlbs_range(struct kvm *kvm, gfn_t gfn, u64 pages); > > #ifdef KVM_ARCH_NR_OBJS_PER_MEMORY_CACHE > int kvm_mmu_topup_memory_cache(struct kvm_mmu_memory_cache *mc, int min); > @@ -1486,6 +1487,14 @@ static inline int kvm_arch_flush_remote_tlbs(struct kvm *kvm) > } > #endif > > +#ifndef __KVM_HAVE_ARCH_FLUSH_REMOTE_TLBS_RANGE > +static inline int kvm_arch_flush_remote_tlbs_range(struct kvm *kvm, > + gfn_t gfn, u64 pages) > +{ > + return -EOPNOTSUPP; > +} > +#endif > + > #ifdef __KVM_HAVE_ARCH_NONCOHERENT_DMA > void kvm_arch_register_noncoherent_dma(struct kvm *kvm); > void kvm_arch_unregister_noncoherent_dma(struct kvm *kvm); > diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c > index d6b050786155..804470fccac7 100644 > --- a/virt/kvm/kvm_main.c > +++ b/virt/kvm/kvm_main.c > @@ -366,6 +366,19 @@ void kvm_flush_remote_tlbs(struct kvm *kvm) > } > EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs); > > +void kvm_flush_remote_tlbs_range(struct kvm *kvm, gfn_t gfn, u64 pages) > +{ > + if (!kvm_arch_flush_remote_tlbs_range(kvm, gfn, pages)) > + return; > + > + /* > + * Fall back to a flushing entire TLBs if the architecture range-based > + * TLB invalidation is unsupported or can't be performed for whatever > + * reason. > + */ > + kvm_flush_remote_tlbs(kvm); > +} > + > static void kvm_flush_shadow_all(struct kvm *kvm) > { > kvm_arch_flush_shadow_all(kvm); > -- > 2.41.0.487.g6d72f3e995-goog >
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index a2d3cfc2eb75..08900afbf2ad 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -1804,6 +1804,9 @@ static inline int kvm_arch_flush_remote_tlbs(struct kvm *kvm) return -ENOTSUPP; } +#define __KVM_HAVE_ARCH_FLUSH_REMOTE_TLBS_RANGE +int kvm_arch_flush_remote_tlbs_range(struct kvm *kvm, gfn_t start_gfn, u64 pages); + #define kvm_arch_pmi_in_guest(vcpu) \ ((vcpu) && (vcpu)->arch.handling_intr_from_guest) diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index ec169f5c7dce..eb88d25f9896 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -278,16 +278,15 @@ static inline bool kvm_available_flush_remote_tlbs_range(void) return kvm_x86_ops.flush_remote_tlbs_range; } -void kvm_flush_remote_tlbs_range(struct kvm *kvm, gfn_t start_gfn, - gfn_t nr_pages) +int kvm_arch_flush_remote_tlbs_range(struct kvm *kvm, gfn_t start_gfn, u64 pages) { int ret = -EOPNOTSUPP; if (kvm_x86_ops.flush_remote_tlbs_range) ret = static_call(kvm_x86_flush_remote_tlbs_range)(kvm, start_gfn, - nr_pages); - if (ret) - kvm_flush_remote_tlbs(kvm); + pages); + + return ret; } static gfn_t kvm_mmu_page_get_gfn(struct kvm_mmu_page *sp, int index); diff --git a/arch/x86/kvm/mmu/mmu_internal.h b/arch/x86/kvm/mmu/mmu_internal.h index d39af5639ce9..86cb83bb3480 100644 --- a/arch/x86/kvm/mmu/mmu_internal.h +++ b/arch/x86/kvm/mmu/mmu_internal.h @@ -170,9 +170,6 @@ bool kvm_mmu_slot_gfn_write_protect(struct kvm *kvm, struct kvm_memory_slot *slot, u64 gfn, int min_level); -void kvm_flush_remote_tlbs_range(struct kvm *kvm, gfn_t start_gfn, - gfn_t nr_pages); - /* Flush the given page (huge or not) of guest memory. */ static inline void kvm_flush_remote_tlbs_gfn(struct kvm *kvm, gfn_t gfn, int level) { diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index e3f968b38ae9..a731967b24ff 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -1359,6 +1359,7 @@ int kvm_vcpu_yield_to(struct kvm_vcpu *target); void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu, bool yield_to_kernel_mode); void kvm_flush_remote_tlbs(struct kvm *kvm); +void kvm_flush_remote_tlbs_range(struct kvm *kvm, gfn_t gfn, u64 pages); #ifdef KVM_ARCH_NR_OBJS_PER_MEMORY_CACHE int kvm_mmu_topup_memory_cache(struct kvm_mmu_memory_cache *mc, int min); @@ -1486,6 +1487,14 @@ static inline int kvm_arch_flush_remote_tlbs(struct kvm *kvm) } #endif +#ifndef __KVM_HAVE_ARCH_FLUSH_REMOTE_TLBS_RANGE +static inline int kvm_arch_flush_remote_tlbs_range(struct kvm *kvm, + gfn_t gfn, u64 pages) +{ + return -EOPNOTSUPP; +} +#endif + #ifdef __KVM_HAVE_ARCH_NONCOHERENT_DMA void kvm_arch_register_noncoherent_dma(struct kvm *kvm); void kvm_arch_unregister_noncoherent_dma(struct kvm *kvm); diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index d6b050786155..804470fccac7 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -366,6 +366,19 @@ void kvm_flush_remote_tlbs(struct kvm *kvm) } EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs); +void kvm_flush_remote_tlbs_range(struct kvm *kvm, gfn_t gfn, u64 pages) +{ + if (!kvm_arch_flush_remote_tlbs_range(kvm, gfn, pages)) + return; + + /* + * Fall back to a flushing entire TLBs if the architecture range-based + * TLB invalidation is unsupported or can't be performed for whatever + * reason. + */ + kvm_flush_remote_tlbs(kvm); +} + static void kvm_flush_shadow_all(struct kvm *kvm) { kvm_arch_flush_shadow_all(kvm);