[PATCH 14/18] KVM: PPC: Book3S HV: MMU notifier callbacks for radix guests
Suraj Jitindar Singh
sjitindarsingh at gmail.com
Mon Jan 23 14:21:00 AEDT 2017
On Thu, 2017-01-12 at 20:07 +1100, Paul Mackerras wrote:
> This adapts our implementations of the MMU notifier callbacks
> (unmap_hva, unmap_hva_range, age_hva, test_age_hva, set_spte_hva)
> to call radix functions when the guest is using radix. These
> implementations are much simpler than for HPT guests because we
> have only one PTE to deal with, so we don't need to traverse
> rmap chains.
>
> Signed-off-by: Paul Mackerras <paulus at ozlabs.org>
> ---
> arch/powerpc/include/asm/kvm_book3s.h | 6 ++++
> arch/powerpc/kvm/book3s_64_mmu_hv.c | 64 +++++++++++++++++++++++-
> ----------
> arch/powerpc/kvm/book3s_64_mmu_radix.c | 54
> ++++++++++++++++++++++++++++
> 3 files changed, 103 insertions(+), 21 deletions(-)
>
> diff --git a/arch/powerpc/include/asm/kvm_book3s.h
> b/arch/powerpc/include/asm/kvm_book3s.h
> index ff5cd5c..952cc4b 100644
> --- a/arch/powerpc/include/asm/kvm_book3s.h
> +++ b/arch/powerpc/include/asm/kvm_book3s.h
> @@ -192,6 +192,12 @@ extern int kvmppc_mmu_radix_xlate(struct
> kvm_vcpu *vcpu, gva_t eaddr,
> extern void kvmppc_free_radix(struct kvm *kvm);
> extern int kvmppc_radix_init(void);
> extern void kvmppc_radix_exit(void);
> +extern int kvm_unmap_radix(struct kvm *kvm, struct kvm_memory_slot
> *memslot,
> + unsigned long gfn);
> +extern int kvm_age_radix(struct kvm *kvm, struct kvm_memory_slot
> *memslot,
> + unsigned long gfn);
> +extern int kvm_test_age_radix(struct kvm *kvm, struct
> kvm_memory_slot *memslot,
> + unsigned long gfn);
>
> /* XXX remove this export when load_last_inst() is generic */
> extern int kvmppc_ld(struct kvm_vcpu *vcpu, ulong *eaddr, int size,
> void *ptr, bool data);
> diff --git a/arch/powerpc/kvm/book3s_64_mmu_hv.c
> b/arch/powerpc/kvm/book3s_64_mmu_hv.c
> index 57690c2..fbb3de4 100644
> --- a/arch/powerpc/kvm/book3s_64_mmu_hv.c
> +++ b/arch/powerpc/kvm/book3s_64_mmu_hv.c
> @@ -701,12 +701,13 @@ static void kvmppc_rmap_reset(struct kvm *kvm)
> srcu_read_unlock(&kvm->srcu, srcu_idx);
> }
>
> +typedef int (*hva_handler_fn)(struct kvm *kvm, struct
> kvm_memory_slot *memslot,
> + unsigned long gfn);
> +
> static int kvm_handle_hva_range(struct kvm *kvm,
> unsigned long start,
> unsigned long end,
> - int (*handler)(struct kvm *kvm,
> - unsigned long *rmapp,
> - unsigned long gfn))
> + hva_handler_fn handler)
> {
> int ret;
> int retval = 0;
> @@ -731,9 +732,7 @@ static int kvm_handle_hva_range(struct kvm *kvm,
> gfn_end = hva_to_gfn_memslot(hva_end + PAGE_SIZE -
> 1, memslot);
>
> for (; gfn < gfn_end; ++gfn) {
> - gfn_t gfn_offset = gfn - memslot->base_gfn;
> -
> - ret = handler(kvm, &memslot-
> >arch.rmap[gfn_offset], gfn);
> + ret = handler(kvm, memslot, gfn);
> retval |= ret;
> }
> }
> @@ -742,20 +741,21 @@ static int kvm_handle_hva_range(struct kvm
> *kvm,
> }
>
> static int kvm_handle_hva(struct kvm *kvm, unsigned long hva,
> - int (*handler)(struct kvm *kvm, unsigned
> long *rmapp,
> - unsigned long gfn))
> + hva_handler_fn handler)
> {
> return kvm_handle_hva_range(kvm, hva, hva + 1, handler);
> }
>
> -static int kvm_unmap_rmapp(struct kvm *kvm, unsigned long *rmapp,
> +static int kvm_unmap_rmapp(struct kvm *kvm, struct kvm_memory_slot
> *memslot,
> unsigned long gfn)
> {
> struct revmap_entry *rev = kvm->arch.revmap;
> unsigned long h, i, j;
> __be64 *hptep;
> unsigned long ptel, psize, rcbits;
> + unsigned long *rmapp;
>
> + rmapp = &memslot->arch.rmap[gfn - memslot->base_gfn];
> for (;;) {
> lock_rmap(rmapp);
> if (!(*rmapp & KVMPPC_RMAP_PRESENT)) {
> @@ -816,26 +816,36 @@ static int kvm_unmap_rmapp(struct kvm *kvm,
> unsigned long *rmapp,
>
> int kvm_unmap_hva_hv(struct kvm *kvm, unsigned long hva)
> {
> - kvm_handle_hva(kvm, hva, kvm_unmap_rmapp);
> + hva_handler_fn handler;
> +
> + handler = kvm->arch.radix ? kvm_unmap_radix :
kvm_is_radix() for consistency?
> kvm_unmap_rmapp;
> + kvm_handle_hva(kvm, hva, handler);
> return 0;
> }
>
> int kvm_unmap_hva_range_hv(struct kvm *kvm, unsigned long start,
> unsigned long end)
> {
> - kvm_handle_hva_range(kvm, start, end, kvm_unmap_rmapp);
> + hva_handler_fn handler;
> +
> + handler = kvm->arch.radix ? kvm_unmap_radix :
ditto
> kvm_unmap_rmapp;
> + kvm_handle_hva_range(kvm, start, end, handler);
> return 0;
> }
>
> void kvmppc_core_flush_memslot_hv(struct kvm *kvm,
> struct kvm_memory_slot *memslot)
> {
> - unsigned long *rmapp;
> unsigned long gfn;
> unsigned long n;
> + unsigned long *rmapp;
>
> - rmapp = memslot->arch.rmap;
> gfn = memslot->base_gfn;
> - for (n = memslot->npages; n; --n) {
> + rmapp = memslot->arch.rmap;
> + for (n = memslot->npages; n; --n, ++gfn) {
> + if (kvm->arch.radix) {
ditto
> + kvm_unmap_radix(kvm, memslot, gfn);
> + continue;
> + }
> /*
> * Testing the present bit without locking is OK
> because
> * the memslot has been marked invalid already, and
> hence
> @@ -843,20 +853,21 @@ void kvmppc_core_flush_memslot_hv(struct kvm
> *kvm,
> * thus the present bit can't go from 0 to 1.
> */
> if (*rmapp & KVMPPC_RMAP_PRESENT)
> - kvm_unmap_rmapp(kvm, rmapp, gfn);
> + kvm_unmap_rmapp(kvm, memslot, gfn);
> ++rmapp;
> - ++gfn;
> }
> }
>
> -static int kvm_age_rmapp(struct kvm *kvm, unsigned long *rmapp,
> +static int kvm_age_rmapp(struct kvm *kvm, struct kvm_memory_slot
> *memslot,
> unsigned long gfn)
> {
> struct revmap_entry *rev = kvm->arch.revmap;
> unsigned long head, i, j;
> __be64 *hptep;
> int ret = 0;
> + unsigned long *rmapp;
>
> + rmapp = &memslot->arch.rmap[gfn - memslot->base_gfn];
> retry:
> lock_rmap(rmapp);
> if (*rmapp & KVMPPC_RMAP_REFERENCED) {
> @@ -904,17 +915,22 @@ static int kvm_age_rmapp(struct kvm *kvm,
> unsigned long *rmapp,
>
> int kvm_age_hva_hv(struct kvm *kvm, unsigned long start, unsigned
> long end)
> {
> - return kvm_handle_hva_range(kvm, start, end, kvm_age_rmapp);
> + hva_handler_fn handler;
> +
> + handler = kvm->arch.radix ? kvm_age_radix : kvm_age_rmapp;
ditto
> + return kvm_handle_hva_range(kvm, start, end, handler);
> }
>
> -static int kvm_test_age_rmapp(struct kvm *kvm, unsigned long *rmapp,
> +static int kvm_test_age_rmapp(struct kvm *kvm, struct
> kvm_memory_slot *memslot,
> unsigned long gfn)
> {
> struct revmap_entry *rev = kvm->arch.revmap;
> unsigned long head, i, j;
> unsigned long *hp;
> int ret = 1;
> + unsigned long *rmapp;
>
> + rmapp = &memslot->arch.rmap[gfn - memslot->base_gfn];
> if (*rmapp & KVMPPC_RMAP_REFERENCED)
> return 1;
>
> @@ -940,12 +956,18 @@ static int kvm_test_age_rmapp(struct kvm *kvm,
> unsigned long *rmapp,
>
> int kvm_test_age_hva_hv(struct kvm *kvm, unsigned long hva)
> {
> - return kvm_handle_hva(kvm, hva, kvm_test_age_rmapp);
> + hva_handler_fn handler;
> +
> + handler = kvm->arch.radix ? kvm_test_age_radix :
ditto
> kvm_test_age_rmapp;
> + return kvm_handle_hva(kvm, hva, handler);
> }
>
> void kvm_set_spte_hva_hv(struct kvm *kvm, unsigned long hva, pte_t
> pte)
> {
> - kvm_handle_hva(kvm, hva, kvm_unmap_rmapp);
> + hva_handler_fn handler;
> +
> + handler = kvm->arch.radix ? kvm_unmap_radix :
ditto
> kvm_unmap_rmapp;
> + kvm_handle_hva(kvm, hva, handler);
> }
>
> static int vcpus_running(struct kvm *kvm)
> diff --git a/arch/powerpc/kvm/book3s_64_mmu_radix.c
> b/arch/powerpc/kvm/book3s_64_mmu_radix.c
> index 865ea9b..69cabad 100644
> --- a/arch/powerpc/kvm/book3s_64_mmu_radix.c
> +++ b/arch/powerpc/kvm/book3s_64_mmu_radix.c
> @@ -463,6 +463,60 @@ int kvmppc_book3s_radix_page_fault(struct
> kvm_run *run, struct kvm_vcpu *vcpu,
> return ret;
> }
>
> +/* Called with kvm->lock held */
> +int kvm_unmap_radix(struct kvm *kvm, struct kvm_memory_slot
> *memslot,
> + unsigned long gfn)
> +{
> + pte_t *ptep;
> + unsigned long gpa = gfn << PAGE_SHIFT;
> + unsigned int shift;
> +
> + ptep = __find_linux_pte_or_hugepte(kvm->arch.pgtable, gpa,
> + NULL, &shift);
> + if (ptep && pte_present(*ptep)) {
> + kvmppc_radix_update_pte(kvm, ptep, _PAGE_PRESENT, 0,
> + gpa, shift);
> + kvmppc_radix_tlbie_page(kvm, gpa, shift);
> + }
> + return 0;
> +}
> +
> +/* Called with kvm->lock held */
> +int kvm_age_radix(struct kvm *kvm, struct kvm_memory_slot *memslot,
> + unsigned long gfn)
> +{
> + pte_t *ptep;
> + unsigned long gpa = gfn << PAGE_SHIFT;
> + unsigned int shift;
> + int ref = 0;
> +
> + ptep = __find_linux_pte_or_hugepte(kvm->arch.pgtable, gpa,
> + NULL, &shift);
> + if (ptep && pte_present(*ptep) && pte_young(*ptep)) {
> + kvmppc_radix_update_pte(kvm, ptep, _PAGE_ACCESSED,
> 0,
> + gpa, shift);
> + /* XXX need to flush tlb here? */
> + ref = 1;
> + }
> + return ref;
> +}
> +
> +/* Called with kvm->lock held */
> +int kvm_test_age_radix(struct kvm *kvm, struct kvm_memory_slot
> *memslot,
> + unsigned long gfn)
> +{
> + pte_t *ptep;
> + unsigned long gpa = gfn << PAGE_SHIFT;
> + unsigned int shift;
> + int ref = 0;
> +
> + ptep = __find_linux_pte_or_hugepte(kvm->arch.pgtable, gpa,
> + NULL, &shift);
> + if (ptep && pte_present(*ptep) && pte_young(*ptep))
> + ref = 1;
> + return ref;
> +}
> +
> void kvmppc_free_radix(struct kvm *kvm)
> {
> unsigned long ig, iu, im;
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