Re: [PATCH 1/4] KVM: PPC: Add support for multiple-TCE hcalls
From: Paolo Bonzini
Date: Mon May 27 2013 - 06:09:03 EST
Il 21/05/2013 05:06, Alexey Kardashevskiy ha scritto:
> This adds real mode handlers for the H_PUT_TCE_INDIRECT and
> H_STUFF_TCE hypercalls for QEMU emulated devices such as virtio
> devices or emulated PCI.
Do you mean vio? virtio (without getting into whether that's good or
bad) will bypass the iommu.
Paolo
> These calls allow adding multiple entries
> (up to 512) into the TCE table in one call which saves time on
> transition to/from real mode.
>
> This adds a tce_tmp cache to kvm_vcpu_arch to save valid TCEs
> (copied from user and verified) before writing the whole list into
> the TCE table. This cache will be utilized more in the upcoming
> VFIO/IOMMU support to continue TCE list processing in the virtual
> mode in the case if the real mode handler failed for some reason.
>
> This adds a guest physical to host real address converter
> and calls the existing H_PUT_TCE handler. The converting function
> is going to be fully utilized by upcoming VFIO supporting patches.
>
> This also implements the KVM_CAP_PPC_MULTITCE capability,
> so in order to support the functionality of this patch, QEMU
> needs to query for this capability and set the "hcall-multi-tce"
> hypertas property only if the capability is present, otherwise
> there will be serious performance degradation.
>
> Cc: David Gibson <david@xxxxxxxxxxxxxxxxxxxxx>
> Signed-off-by: Alexey Kardashevskiy <aik@xxxxxxxxx>
> Signed-off-by: Paul Mackerras <paulus@xxxxxxxxx>
>
> ---
> Changelog:
> * added kvm_vcpu_arch::tce_tmp
> * removed cleanup if put_indirect failed, instead we do not even start
> writing to TCE table if we cannot get TCEs from the user and they are
> invalid
> * kvmppc_emulated_h_put_tce is split to kvmppc_emulated_put_tce
> and kvmppc_emulated_validate_tce (for the previous item)
> * fixed bug with failthrough for H_IPI
> * removed all get_user() from real mode handlers
> * kvmppc_lookup_pte() added (instead of making lookup_linux_pte public)
> ---
> Documentation/virtual/kvm/api.txt | 14 ++
> arch/powerpc/include/asm/kvm_host.h | 2 +
> arch/powerpc/include/asm/kvm_ppc.h | 16 +-
> arch/powerpc/kvm/book3s_64_vio.c | 118 ++++++++++++++
> arch/powerpc/kvm/book3s_64_vio_hv.c | 266 +++++++++++++++++++++++++++----
> arch/powerpc/kvm/book3s_hv.c | 39 +++++
> arch/powerpc/kvm/book3s_hv_rmhandlers.S | 6 +
> arch/powerpc/kvm/book3s_pr_papr.c | 37 ++++-
> arch/powerpc/kvm/powerpc.c | 3 +
> include/uapi/linux/kvm.h | 1 +
> 10 files changed, 470 insertions(+), 32 deletions(-)
>
> diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
> index 5f91eda..3c7c7ea 100644
> --- a/Documentation/virtual/kvm/api.txt
> +++ b/Documentation/virtual/kvm/api.txt
> @@ -2780,3 +2780,17 @@ Parameters: args[0] is the XICS device fd
> args[1] is the XICS CPU number (server ID) for this vcpu
>
> This capability connects the vcpu to an in-kernel XICS device.
> +
> +6.8 KVM_CAP_PPC_MULTITCE
> +
> +Architectures: ppc
> +Parameters: none
> +Returns: 0 on success; -1 on error
> +
> +This capability enables the guest to put/remove multiple TCE entries
> +per hypercall which significanly accelerates DMA operations for PPC KVM
> +guests.
> +
> +When this capability is enabled, H_PUT_TCE_INDIRECT and H_STUFF_TCE are
> +expected to occur rather than H_PUT_TCE which supports only one TCE entry
> +per call.
> diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
> index af326cd..85d8f26 100644
> --- a/arch/powerpc/include/asm/kvm_host.h
> +++ b/arch/powerpc/include/asm/kvm_host.h
> @@ -609,6 +609,8 @@ struct kvm_vcpu_arch {
> spinlock_t tbacct_lock;
> u64 busy_stolen;
> u64 busy_preempt;
> +
> + unsigned long *tce_tmp; /* TCE cache for TCE_PUT_INDIRECT hall */
> #endif
> };
>
> diff --git a/arch/powerpc/include/asm/kvm_ppc.h b/arch/powerpc/include/asm/kvm_ppc.h
> index a5287fe..e852921b 100644
> --- a/arch/powerpc/include/asm/kvm_ppc.h
> +++ b/arch/powerpc/include/asm/kvm_ppc.h
> @@ -133,8 +133,20 @@ extern int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu);
>
> extern long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm,
> struct kvm_create_spapr_tce *args);
> -extern long kvmppc_h_put_tce(struct kvm_vcpu *vcpu, unsigned long liobn,
> - unsigned long ioba, unsigned long tce);
> +extern struct kvmppc_spapr_tce_table *kvmppc_find_tce_table(
> + struct kvm_vcpu *vcpu, unsigned long liobn);
> +extern long kvmppc_emulated_validate_tce(unsigned long tce);
> +extern void kvmppc_emulated_put_tce(struct kvmppc_spapr_tce_table *tt,
> + unsigned long ioba, unsigned long tce);
> +extern long kvmppc_virtmode_h_put_tce(struct kvm_vcpu *vcpu,
> + unsigned long liobn, unsigned long ioba,
> + unsigned long tce);
> +extern long kvmppc_virtmode_h_put_tce_indirect(struct kvm_vcpu *vcpu,
> + unsigned long liobn, unsigned long ioba,
> + unsigned long tce_list, unsigned long npages);
> +extern long kvmppc_virtmode_h_stuff_tce(struct kvm_vcpu *vcpu,
> + unsigned long liobn, unsigned long ioba,
> + unsigned long tce_value, unsigned long npages);
> extern long kvm_vm_ioctl_allocate_rma(struct kvm *kvm,
> struct kvm_allocate_rma *rma);
> extern struct kvmppc_linear_info *kvm_alloc_rma(void);
> diff --git a/arch/powerpc/kvm/book3s_64_vio.c b/arch/powerpc/kvm/book3s_64_vio.c
> index b2d3f3b..06b7b20 100644
> --- a/arch/powerpc/kvm/book3s_64_vio.c
> +++ b/arch/powerpc/kvm/book3s_64_vio.c
> @@ -14,6 +14,7 @@
> *
> * Copyright 2010 Paul Mackerras, IBM Corp. <paulus@xxxxxxxxxxx>
> * Copyright 2011 David Gibson, IBM Corporation <dwg@xxxxxxxxxxx>
> + * Copyright 2013 Alexey Kardashevskiy, IBM Corporation <aik@xxxxxxxxxxx>
> */
>
> #include <linux/types.h>
> @@ -36,8 +37,11 @@
> #include <asm/ppc-opcode.h>
> #include <asm/kvm_host.h>
> #include <asm/udbg.h>
> +#include <asm/iommu.h>
> +#include <asm/tce.h>
>
> #define TCES_PER_PAGE (PAGE_SIZE / sizeof(u64))
> +#define ERROR_ADDR ((void *)~(unsigned long)0x0)
>
> static long kvmppc_stt_npages(unsigned long window_size)
> {
> @@ -148,3 +152,117 @@ fail:
> }
> return ret;
> }
> +
> +/* Converts guest physical address into host virtual */
> +static void __user *kvmppc_virtmode_gpa_to_hva(struct kvm_vcpu *vcpu,
> + unsigned long gpa)
> +{
> + unsigned long hva, gfn = gpa >> PAGE_SHIFT;
> + struct kvm_memory_slot *memslot;
> +
> + memslot = search_memslots(kvm_memslots(vcpu->kvm), gfn);
> + if (!memslot)
> + return ERROR_ADDR;
> +
> + hva = __gfn_to_hva_memslot(memslot, gfn) + (gpa & ~PAGE_MASK);
> + return (void *) hva;
> +}
> +
> +long kvmppc_virtmode_h_put_tce(struct kvm_vcpu *vcpu,
> + unsigned long liobn, unsigned long ioba,
> + unsigned long tce)
> +{
> + long ret;
> + struct kvmppc_spapr_tce_table *tt;
> +
> + tt = kvmppc_find_tce_table(vcpu, liobn);
> + /* Didn't find the liobn, put it to userspace */
> + if (!tt)
> + return H_TOO_HARD;
> +
> + /* Emulated IO */
> + if (ioba >= tt->window_size)
> + return H_PARAMETER;
> +
> + ret = kvmppc_emulated_validate_tce(tce);
> + if (ret)
> + return ret;
> +
> + kvmppc_emulated_put_tce(tt, ioba, tce);
> +
> + return H_SUCCESS;
> +}
> +
> +long kvmppc_virtmode_h_put_tce_indirect(struct kvm_vcpu *vcpu,
> + unsigned long liobn, unsigned long ioba,
> + unsigned long tce_list, unsigned long npages)
> +{
> + struct kvmppc_spapr_tce_table *tt;
> + long i, ret;
> + unsigned long __user *tces;
> +
> + tt = kvmppc_find_tce_table(vcpu, liobn);
> + /* Didn't find the liobn, put it to userspace */
> + if (!tt)
> + return H_TOO_HARD;
> +
> + /*
> + * The spec says that the maximum size of the list is 512 TCEs so
> + * so the whole table addressed resides in 4K page
> + */
> + if (npages > 512)
> + return H_PARAMETER;
> +
> + if (tce_list & ~IOMMU_PAGE_MASK)
> + return H_PARAMETER;
> +
> + tces = kvmppc_virtmode_gpa_to_hva(vcpu, tce_list);
> + if (tces == ERROR_ADDR)
> + return H_TOO_HARD;
> +
> + /* Emulated IO */
> + if ((ioba + (npages << IOMMU_PAGE_SHIFT)) > tt->window_size)
> + return H_PARAMETER;
> +
> + for (i = 0; i < npages; ++i) {
> + if (get_user(vcpu->arch.tce_tmp[i], tces + i))
> + return H_PARAMETER;
> +
> + ret = kvmppc_emulated_validate_tce(vcpu->arch.tce_tmp[i]);
> + if (ret)
> + return ret;
> + }
> +
> + for (i = 0; i < npages; ++i)
> + kvmppc_emulated_put_tce(tt,
> + ioba + (i << IOMMU_PAGE_SHIFT),
> + vcpu->arch.tce_tmp[i]);
> +
> + return H_SUCCESS;
> +}
> +
> +long kvmppc_virtmode_h_stuff_tce(struct kvm_vcpu *vcpu,
> + unsigned long liobn, unsigned long ioba,
> + unsigned long tce_value, unsigned long npages)
> +{
> + struct kvmppc_spapr_tce_table *tt;
> + long i, ret;
> +
> + tt = kvmppc_find_tce_table(vcpu, liobn);
> + /* Didn't find the liobn, put it to userspace */
> + if (!tt)
> + return H_TOO_HARD;
> +
> + /* Emulated IO */
> + if ((ioba + (npages << IOMMU_PAGE_SHIFT)) > tt->window_size)
> + return H_PARAMETER;
> +
> + ret = kvmppc_emulated_validate_tce(tce_value);
> + if (ret || (tce_value & (TCE_PCI_WRITE | TCE_PCI_READ)))
> + return H_PARAMETER;
> +
> + for (i = 0; i < npages; ++i, ioba += IOMMU_PAGE_SIZE)
> + kvmppc_emulated_put_tce(tt, ioba, tce_value);
> +
> + return H_SUCCESS;
> +}
> diff --git a/arch/powerpc/kvm/book3s_64_vio_hv.c b/arch/powerpc/kvm/book3s_64_vio_hv.c
> index 30c2f3b..c68d538 100644
> --- a/arch/powerpc/kvm/book3s_64_vio_hv.c
> +++ b/arch/powerpc/kvm/book3s_64_vio_hv.c
> @@ -14,6 +14,7 @@
> *
> * Copyright 2010 Paul Mackerras, IBM Corp. <paulus@xxxxxxxxxxx>
> * Copyright 2011 David Gibson, IBM Corporation <dwg@xxxxxxxxxxx>
> + * Copyright 2013 Alexey Kardashevskiy, IBM Corporation <aik@xxxxxxxxxxx>
> */
>
> #include <linux/types.h>
> @@ -35,42 +36,249 @@
> #include <asm/ppc-opcode.h>
> #include <asm/kvm_host.h>
> #include <asm/udbg.h>
> +#include <asm/iommu.h>
> +#include <asm/tce.h>
>
> #define TCES_PER_PAGE (PAGE_SIZE / sizeof(u64))
> +#define ERROR_ADDR (~(unsigned long)0x0)
>
> -/* WARNING: This will be called in real-mode on HV KVM and virtual
> - * mode on PR KVM
> +/* Finds a TCE table descriptor by LIOBN */
> +struct kvmppc_spapr_tce_table *kvmppc_find_tce_table(struct kvm_vcpu *vcpu,
> + unsigned long liobn)
> +{
> + struct kvmppc_spapr_tce_table *tt;
> +
> + list_for_each_entry(tt, &vcpu->kvm->arch.spapr_tce_tables, list) {
> + if (tt->liobn == liobn)
> + return tt;
> + }
> +
> + return NULL;
> +}
> +EXPORT_SYMBOL_GPL(kvmppc_find_tce_table);
> +
> +/*
> + * Validate TCE address.
> + * At the moment only flags are validated
> + * as other check will significantly slow down
> + * or can make it even impossible to handle TCE requests
> + * in real mode.
> + */
> +long kvmppc_emulated_validate_tce(unsigned long tce)
> +{
> + if (tce & ~(IOMMU_PAGE_MASK | TCE_PCI_WRITE | TCE_PCI_READ))
> + return H_PARAMETER;
> +
> + return H_SUCCESS;
> +}
> +EXPORT_SYMBOL_GPL(kvmppc_emulated_validate_tce);
> +
> +/*
> + * kvmppc_emulated_put_tce() handles TCE requests for devices emulated
> + * by QEMU. It puts guest TCE values into the table and expects
> + * the QEMU to convert them later in the QEMU device implementation.
> + * Wiorks in both real and virtual modes.
> + * It cannot fail so kvmppc_emulated_validate_tce must be called before it.
> */
> +void kvmppc_emulated_put_tce(struct kvmppc_spapr_tce_table *tt,
> + unsigned long ioba, unsigned long tce)
> +{
> + unsigned long idx = ioba >> SPAPR_TCE_SHIFT;
> + struct page *page;
> + u64 *tbl;
> +
> + /*
> + * Note on the use of page_address() in real mode,
> + *
> + * It is safe to use page_address() in real mode on ppc64 because
> + * page_address() is always defined as lowmem_page_address()
> + * which returns __va(PFN_PHYS(page_to_pfn(page))) which is arithmetial
> + * operation and does not access page struct.
> + *
> + * Theoretically page_address() could be defined different
> + * but either WANT_PAGE_VIRTUAL or HASHED_PAGE_VIRTUAL
> + * should be enabled.
> + * WANT_PAGE_VIRTUAL is never enabled on ppc32/ppc64,
> + * HASHED_PAGE_VIRTUAL could be enabled for ppc32 only and only
> + * if CONFIG_HIGHMEM is defined. As CONFIG_SPARSEMEM_VMEMMAP
> + * is not expected to be enabled on ppc32, page_address()
> + * is safe for ppc32 as well.
> + */
> +#if defined(HASHED_PAGE_VIRTUAL) || defined(WANT_PAGE_VIRTUAL)
> +#error TODO: fix to avoid page_address() here
> +#endif
> + page = tt->pages[idx / TCES_PER_PAGE];
> + tbl = (u64 *)page_address(page);
> +
> + /* udbg_printf("tce @ %p\n", &tbl[idx % TCES_PER_PAGE]); */
> + tbl[idx % TCES_PER_PAGE] = tce;
> +}
> +EXPORT_SYMBOL_GPL(kvmppc_emulated_put_tce);
> +
> +#ifdef CONFIG_KVM_BOOK3S_64_HV
> +
> +static pte_t kvmppc_lookup_pte(pgd_t *pgdir, unsigned long hva, bool writing,
> + unsigned long *pte_sizep)
> +{
> + pte_t *ptep;
> + unsigned int shift = 0;
> + pte_t pte, tmp, ret;
> +
> + ptep = find_linux_pte_or_hugepte(pgdir, hva, &shift);
> + if (!ptep)
> + return __pte(0);
> + if (shift)
> + *pte_sizep = 1ul << shift;
> + else
> + *pte_sizep = PAGE_SIZE;
> +
> + if (!pte_present(*ptep))
> + return __pte(0);
> +
> + /* wait until _PAGE_BUSY is clear then set it atomically */
> + __asm__ __volatile__ (
> + "1: ldarx %0,0,%3\n"
> + " andi. %1,%0,%4\n"
> + " bne- 1b\n"
> + " ori %1,%0,%4\n"
> + " stdcx. %1,0,%3\n"
> + " bne- 1b"
> + : "=&r" (pte), "=&r" (tmp), "=m" (*ptep)
> + : "r" (ptep), "i" (_PAGE_BUSY)
> + : "cc");
> +
> + ret = pte;
> +
> + return ret;
> +}
> +
> +/*
> + * Converts guest physical address into host physical address.
> + * Also returns pte and page size if the page is present in page table.
> + */
> +static unsigned long kvmppc_realmode_gpa_to_hpa(struct kvm_vcpu *vcpu,
> + unsigned long gpa)
> +{
> + struct kvm_memory_slot *memslot;
> + pte_t pte;
> + unsigned long hva, hpa, pg_size = 0, offset;
> + unsigned long gfn = gpa >> PAGE_SHIFT;
> + bool writing = gpa & TCE_PCI_WRITE;
> +
> + /* Find a KVM memslot */
> + memslot = search_memslots(kvm_memslots(vcpu->kvm), gfn);
> + if (!memslot)
> + return ERROR_ADDR;
> +
> + /* Convert guest physical address to host virtual */
> + hva = __gfn_to_hva_memslot(memslot, gfn);
> +
> + /* Find a PTE and determine the size */
> + pte = kvmppc_lookup_pte(vcpu->arch.pgdir, hva,
> + writing, &pg_size);
> + if (!pte)
> + return ERROR_ADDR;
> +
> + /* Calculate host phys address keeping flags and offset in the page */
> + offset = gpa & (pg_size - 1);
> +
> + /* pte_pfn(pte) should return an address aligned to pg_size */
> + hpa = (pte_pfn(pte) << PAGE_SHIFT) + offset;
> +
> + return hpa;
> +}
> +
> long kvmppc_h_put_tce(struct kvm_vcpu *vcpu, unsigned long liobn,
> unsigned long ioba, unsigned long tce)
> {
> - struct kvm *kvm = vcpu->kvm;
> - struct kvmppc_spapr_tce_table *stt;
> -
> - /* udbg_printf("H_PUT_TCE(): liobn=0x%lx ioba=0x%lx, tce=0x%lx\n", */
> - /* liobn, ioba, tce); */
> -
> - list_for_each_entry(stt, &kvm->arch.spapr_tce_tables, list) {
> - if (stt->liobn == liobn) {
> - unsigned long idx = ioba >> SPAPR_TCE_SHIFT;
> - struct page *page;
> - u64 *tbl;
> -
> - /* udbg_printf("H_PUT_TCE: liobn 0x%lx => stt=%p window_size=0x%x\n", */
> - /* liobn, stt, stt->window_size); */
> - if (ioba >= stt->window_size)
> - return H_PARAMETER;
> -
> - page = stt->pages[idx / TCES_PER_PAGE];
> - tbl = (u64 *)page_address(page);
> -
> - /* FIXME: Need to validate the TCE itself */
> - /* udbg_printf("tce @ %p\n", &tbl[idx % TCES_PER_PAGE]); */
> - tbl[idx % TCES_PER_PAGE] = tce;
> - return H_SUCCESS;
> - }
> + long ret;
> + struct kvmppc_spapr_tce_table *tt;
> +
> + tt = kvmppc_find_tce_table(vcpu, liobn);
> + /* Didn't find the liobn, put it to virtual space */
> + if (!tt)
> + return H_TOO_HARD;
> +
> + /* Emulated IO */
> + if (ioba >= tt->window_size)
> + return H_PARAMETER;
> +
> + ret = kvmppc_emulated_validate_tce(tce);
> + if (ret)
> + return ret;
> +
> + kvmppc_emulated_put_tce(tt, ioba, tce);
> +
> + return H_SUCCESS;
> +}
> +
> +long kvmppc_h_put_tce_indirect(struct kvm_vcpu *vcpu,
> + unsigned long liobn, unsigned long ioba,
> + unsigned long tce_list, unsigned long npages)
> +{
> + struct kvmppc_spapr_tce_table *tt;
> + long i, ret;
> + unsigned long *tces;
> +
> + tt = kvmppc_find_tce_table(vcpu, liobn);
> + /* Didn't find the liobn, put it to virtual space */
> + if (!tt)
> + return H_TOO_HARD;
> +
> + /*
> + * The spec says that the maximum size of the list is 512 TCEs so
> + * so the whole table addressed resides in 4K page
> + */
> + if (npages > 512)
> + return H_PARAMETER;
> +
> + if (tce_list & ~IOMMU_PAGE_MASK)
> + return H_PARAMETER;
> +
> + tces = (unsigned long *) kvmppc_realmode_gpa_to_hpa(vcpu, tce_list);
> + if ((unsigned long)tces == ERROR_ADDR)
> + return H_TOO_HARD;
> +
> + /* Emulated IO */
> + if ((ioba + (npages << IOMMU_PAGE_SHIFT)) > tt->window_size)
> + return H_PARAMETER;
> +
> + for (i = 0; i < npages; ++i) {
> + ret = kvmppc_emulated_validate_tce(tces[i]);
> + if (ret)
> + return ret;
> }
>
> - /* Didn't find the liobn, punt it to userspace */
> - return H_TOO_HARD;
> + for (i = 0; i < npages; ++i)
> + kvmppc_emulated_put_tce(tt, ioba + (i << IOMMU_PAGE_SHIFT),
> + tces[i]);
> +
> + return H_SUCCESS;
> +}
> +
> +long kvmppc_h_stuff_tce(struct kvm_vcpu *vcpu,
> + unsigned long liobn, unsigned long ioba,
> + unsigned long tce_value, unsigned long npages)
> +{
> + struct kvmppc_spapr_tce_table *tt;
> + long i, ret;
> +
> + tt = kvmppc_find_tce_table(vcpu, liobn);
> + /* Didn't find the liobn, put it to virtual space */
> + if (!tt)
> + return H_TOO_HARD;
> +
> + /* Emulated IO */
> + if ((ioba + (npages << IOMMU_PAGE_SHIFT)) > tt->window_size)
> + return H_PARAMETER;
> +
> + ret = kvmppc_emulated_validate_tce(tce_value);
> + if (ret || (tce_value & (TCE_PCI_WRITE | TCE_PCI_READ)))
> + return H_PARAMETER;
> +
> + for (i = 0; i < npages; ++i, ioba += IOMMU_PAGE_SIZE)
> + kvmppc_emulated_put_tce(tt, ioba, tce_value);
> +
> + return H_SUCCESS;
> }
> +#endif /* CONFIG_KVM_BOOK3S_64_HV */
> diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
> index 9de24f8..9d70fd8 100644
> --- a/arch/powerpc/kvm/book3s_hv.c
> +++ b/arch/powerpc/kvm/book3s_hv.c
> @@ -566,6 +566,30 @@ int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu)
> ret = kvmppc_xics_hcall(vcpu, req);
> break;
> } /* fallthrough */
> + return RESUME_HOST;
> + case H_PUT_TCE:
> + ret = kvmppc_virtmode_h_put_tce(vcpu, kvmppc_get_gpr(vcpu, 4),
> + kvmppc_get_gpr(vcpu, 5),
> + kvmppc_get_gpr(vcpu, 6));
> + if (ret == H_TOO_HARD)
> + return RESUME_HOST;
> + break;
> + case H_PUT_TCE_INDIRECT:
> + ret = kvmppc_virtmode_h_put_tce_indirect(vcpu, kvmppc_get_gpr(vcpu, 4),
> + kvmppc_get_gpr(vcpu, 5),
> + kvmppc_get_gpr(vcpu, 6),
> + kvmppc_get_gpr(vcpu, 7));
> + if (ret == H_TOO_HARD)
> + return RESUME_HOST;
> + break;
> + case H_STUFF_TCE:
> + ret = kvmppc_virtmode_h_stuff_tce(vcpu, kvmppc_get_gpr(vcpu, 4),
> + kvmppc_get_gpr(vcpu, 5),
> + kvmppc_get_gpr(vcpu, 6),
> + kvmppc_get_gpr(vcpu, 7));
> + if (ret == H_TOO_HARD)
> + return RESUME_HOST;
> + break;
> default:
> return RESUME_HOST;
> }
> @@ -956,6 +980,20 @@ struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id)
> vcpu->arch.cpu_type = KVM_CPU_3S_64;
> kvmppc_sanity_check(vcpu);
>
> + /*
> + * As we want to minimize the chance of having H_PUT_TCE_INDIRECT
> + * half executed, we first read TCEs from the user, check them and
> + * return error if something went wrong and only then put TCEs into
> + * the TCE table.
> + *
> + * tce_tmp is a cache for TCEs to avoid stack allocation or
> + * kmalloc as the whole TCE list can take up to 512 items 8 bytes
> + * each (4096 bytes).
> + */
> + vcpu->arch.tce_tmp = kmalloc(4096, GFP_KERNEL);
> + if (!vcpu->arch.tce_tmp)
> + goto free_vcpu;
> +
> return vcpu;
>
> free_vcpu:
> @@ -978,6 +1016,7 @@ void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
> unpin_vpa(vcpu->kvm, &vcpu->arch.slb_shadow);
> unpin_vpa(vcpu->kvm, &vcpu->arch.vpa);
> spin_unlock(&vcpu->arch.vpa_update_lock);
> + kfree(vcpu->arch.tce_tmp);
> kvm_vcpu_uninit(vcpu);
> kmem_cache_free(kvm_vcpu_cache, vcpu);
> }
> diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
> index b02f91e..d35554e 100644
> --- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S
> +++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
> @@ -1490,6 +1490,12 @@ hcall_real_table:
> .long 0 /* 0x11c */
> .long 0 /* 0x120 */
> .long .kvmppc_h_bulk_remove - hcall_real_table
> + .long 0 /* 0x128 */
> + .long 0 /* 0x12c */
> + .long 0 /* 0x130 */
> + .long 0 /* 0x134 */
> + .long .kvmppc_h_stuff_tce - hcall_real_table
> + .long .kvmppc_h_put_tce_indirect - hcall_real_table
> hcall_real_table_end:
>
> ignore_hdec:
> diff --git a/arch/powerpc/kvm/book3s_pr_papr.c b/arch/powerpc/kvm/book3s_pr_papr.c
> index b24309c..3750e3c 100644
> --- a/arch/powerpc/kvm/book3s_pr_papr.c
> +++ b/arch/powerpc/kvm/book3s_pr_papr.c
> @@ -220,7 +220,38 @@ static int kvmppc_h_pr_put_tce(struct kvm_vcpu *vcpu)
> unsigned long tce = kvmppc_get_gpr(vcpu, 6);
> long rc;
>
> - rc = kvmppc_h_put_tce(vcpu, liobn, ioba, tce);
> + rc = kvmppc_virtmode_h_put_tce(vcpu, liobn, ioba, tce);
> + if (rc == H_TOO_HARD)
> + return EMULATE_FAIL;
> + kvmppc_set_gpr(vcpu, 3, rc);
> + return EMULATE_DONE;
> +}
> +
> +static int kvmppc_h_pr_put_tce_indirect(struct kvm_vcpu *vcpu)
> +{
> + unsigned long liobn = kvmppc_get_gpr(vcpu, 4);
> + unsigned long ioba = kvmppc_get_gpr(vcpu, 5);
> + unsigned long tce = kvmppc_get_gpr(vcpu, 6);
> + unsigned long npages = kvmppc_get_gpr(vcpu, 7);
> + long rc;
> +
> + rc = kvmppc_virtmode_h_put_tce_indirect(vcpu, liobn, ioba,
> + tce, npages);
> + if (rc == H_TOO_HARD)
> + return EMULATE_FAIL;
> + kvmppc_set_gpr(vcpu, 3, rc);
> + return EMULATE_DONE;
> +}
> +
> +static int kvmppc_h_pr_stuff_tce(struct kvm_vcpu *vcpu)
> +{
> + unsigned long liobn = kvmppc_get_gpr(vcpu, 4);
> + unsigned long ioba = kvmppc_get_gpr(vcpu, 5);
> + unsigned long tce_value = kvmppc_get_gpr(vcpu, 6);
> + unsigned long npages = kvmppc_get_gpr(vcpu, 7);
> + long rc;
> +
> + rc = kvmppc_virtmode_h_stuff_tce(vcpu, liobn, ioba, tce_value, npages);
> if (rc == H_TOO_HARD)
> return EMULATE_FAIL;
> kvmppc_set_gpr(vcpu, 3, rc);
> @@ -247,6 +278,10 @@ int kvmppc_h_pr(struct kvm_vcpu *vcpu, unsigned long cmd)
> return kvmppc_h_pr_bulk_remove(vcpu);
> case H_PUT_TCE:
> return kvmppc_h_pr_put_tce(vcpu);
> + case H_PUT_TCE_INDIRECT:
> + return kvmppc_h_pr_put_tce_indirect(vcpu);
> + case H_STUFF_TCE:
> + return kvmppc_h_pr_stuff_tce(vcpu);
> case H_CEDE:
> vcpu->arch.shared->msr |= MSR_EE;
> kvm_vcpu_block(vcpu);
> diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
> index 6316ee3..8465c2a 100644
> --- a/arch/powerpc/kvm/powerpc.c
> +++ b/arch/powerpc/kvm/powerpc.c
> @@ -395,6 +395,9 @@ int kvm_dev_ioctl_check_extension(long ext)
> r = 1;
> break;
> #endif
> + case KVM_CAP_SPAPR_MULTITCE:
> + r = 1;
> + break;
> default:
> r = 0;
> break;
> diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
> index a5c86fc..5a2afda 100644
> --- a/include/uapi/linux/kvm.h
> +++ b/include/uapi/linux/kvm.h
> @@ -666,6 +666,7 @@ struct kvm_ppc_smmu_info {
> #define KVM_CAP_IRQ_MPIC 90
> #define KVM_CAP_PPC_RTAS 91
> #define KVM_CAP_IRQ_XICS 92
> +#define KVM_CAP_SPAPR_MULTITCE (0x110000 + 89)
>
> #ifdef KVM_CAP_IRQ_ROUTING
>
>
--
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