1 files changed, 0 insertions, 570 deletions

diff --git a/arch/powerpc/kvm/book3s_64_vio_hv.c b/arch/powerpc/kvm/book3s_64_vio_hv.c
deleted file mode 100644
index 3adfd2f5301c..000000000000
--- a/arch/powerpc/kvm/book3s_64_vio_hv.c
+++ /dev/null
@@ -1,570 +0,0 @@
-/*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License, version 2, as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
- *
- * Copyright 2010 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
- * Copyright 2011 David Gibson, IBM Corporation <dwg@au1.ibm.com>
- * Copyright 2016 Alexey Kardashevskiy, IBM Corporation <aik@au1.ibm.com>
- */
-
-#include <linux/types.h>
-#include <linux/string.h>
-#include <linux/kvm.h>
-#include <linux/kvm_host.h>
-#include <linux/highmem.h>
-#include <linux/gfp.h>
-#include <linux/slab.h>
-#include <linux/hugetlb.h>
-#include <linux/list.h>
-
-#include <asm/tlbflush.h>
-#include <asm/kvm_ppc.h>
-#include <asm/kvm_book3s.h>
-#include <asm/book3s/64/mmu-hash.h>
-#include <asm/mmu_context.h>
-#include <asm/hvcall.h>
-#include <asm/synch.h>
-#include <asm/ppc-opcode.h>
-#include <asm/kvm_host.h>
-#include <asm/udbg.h>
-#include <asm/iommu.h>
-#include <asm/tce.h>
-
-#ifdef CONFIG_BUG
-
-#define WARN_ON_ONCE_RM(condition)	({			\
-	static bool __section(.data.unlikely) __warned;		\
-	int __ret_warn_once = !!(condition);			\
-								\
-	if (unlikely(__ret_warn_once && !__warned)) {		\
-		__warned = true;				\
-		pr_err("WARN_ON_ONCE_RM: (%s) at %s:%u\n",	\
-				__stringify(condition),		\
-				__func__, __LINE__);		\
-		dump_stack();					\
-	}							\
-	unlikely(__ret_warn_once);				\
-})
-
-#else
-
-#define WARN_ON_ONCE_RM(condition) ({				\
-	int __ret_warn_on = !!(condition);			\
-	unlikely(__ret_warn_on);				\
-})
-
-#endif
-
-#define TCES_PER_PAGE	(PAGE_SIZE / sizeof(u64))
-
-/*
- * Finds a TCE table descriptor by LIOBN.
- *
- * WARNING: This will be called in real or virtual mode on HV KVM and virtual
- *          mode on PR KVM
- */
-struct kvmppc_spapr_tce_table *kvmppc_find_table(struct kvm *kvm,
-		unsigned long liobn)
-{
-	struct kvmppc_spapr_tce_table *stt;
-
-	list_for_each_entry_lockless(stt, &kvm->arch.spapr_tce_tables, list)
-		if (stt->liobn == liobn)
-			return stt;
-
-	return NULL;
-}
-EXPORT_SYMBOL_GPL(kvmppc_find_table);
-
-/*
- * Validates TCE address.
- * At the moment flags and page mask are validated.
- * As the host kernel does not access those addresses (just puts them
- * to the table and user space is supposed to process them), we can skip
- * checking other things (such as TCE is a guest RAM address or the page
- * was actually allocated).
- *
- * WARNING: This will be called in real-mode on HV KVM and virtual
- *          mode on PR KVM
- */
-long kvmppc_tce_validate(struct kvmppc_spapr_tce_table *stt, unsigned long tce)
-{
-	unsigned long gpa = tce & ~(TCE_PCI_READ | TCE_PCI_WRITE);
-	enum dma_data_direction dir = iommu_tce_direction(tce);
-
-	/* Allow userspace to poison TCE table */
-	if (dir == DMA_NONE)
-		return H_SUCCESS;
-
-	if (iommu_tce_check_gpa(stt->page_shift, gpa))
-		return H_PARAMETER;
-
-	return H_SUCCESS;
-}
-EXPORT_SYMBOL_GPL(kvmppc_tce_validate);
-
-/* 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 arithmetic
- * operation and does not access page struct.
- *
- * Theoretically page_address() could be defined different
- * but either WANT_PAGE_VIRTUAL or HASHED_PAGE_VIRTUAL
- * would have to 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.
- *
- * WARNING: This will be called in real-mode on HV KVM and virtual
- *          mode on PR KVM
- */
-static u64 *kvmppc_page_address(struct page *page)
-{
-#if defined(HASHED_PAGE_VIRTUAL) || defined(WANT_PAGE_VIRTUAL)
-#error TODO: fix to avoid page_address() here
-#endif
-	return (u64 *) page_address(page);
-}
-
-/*
- * Handles TCE requests for emulated devices.
- * Puts guest TCE values to the table and expects user space to convert them.
- * Called in both real and virtual modes.
- * Cannot fail so kvmppc_tce_validate must be called before it.
- *
- * WARNING: This will be called in real-mode on HV KVM and virtual
- *          mode on PR KVM
- */
-void kvmppc_tce_put(struct kvmppc_spapr_tce_table *stt,
-		unsigned long idx, unsigned long tce)
-{
-	struct page *page;
-	u64 *tbl;
-
-	idx -= stt->offset;
-	page = stt->pages[idx / TCES_PER_PAGE];
-	tbl = kvmppc_page_address(page);
-
-	tbl[idx % TCES_PER_PAGE] = tce;
-}
-EXPORT_SYMBOL_GPL(kvmppc_tce_put);
-
-long kvmppc_gpa_to_ua(struct kvm *kvm, unsigned long gpa,
-		unsigned long *ua, unsigned long **prmap)
-{
-	unsigned long gfn = gpa >> PAGE_SHIFT;
-	struct kvm_memory_slot *memslot;
-
-	memslot = search_memslots(kvm_memslots(kvm), gfn);
-	if (!memslot)
-		return -EINVAL;
-
-	*ua = __gfn_to_hva_memslot(memslot, gfn) |
-		(gpa & ~(PAGE_MASK | TCE_PCI_READ | TCE_PCI_WRITE));
-
-#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
-	if (prmap)
-		*prmap = &memslot->arch.rmap[gfn - memslot->base_gfn];
-#endif
-
-	return 0;
-}
-EXPORT_SYMBOL_GPL(kvmppc_gpa_to_ua);
-
-#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
-static void kvmppc_rm_clear_tce(struct iommu_table *tbl, unsigned long entry)
-{
-	unsigned long hpa = 0;
-	enum dma_data_direction dir = DMA_NONE;
-
-	iommu_tce_xchg_rm(tbl, entry, &hpa, &dir);
-}
-
-static long kvmppc_rm_tce_iommu_mapped_dec(struct kvm *kvm,
-		struct iommu_table *tbl, unsigned long entry)
-{
-	struct mm_iommu_table_group_mem_t *mem = NULL;
-	const unsigned long pgsize = 1ULL << tbl->it_page_shift;
-	unsigned long *pua = IOMMU_TABLE_USERSPACE_ENTRY(tbl, entry);
-
-	if (!pua)
-		/* it_userspace allocation might be delayed */
-		return H_TOO_HARD;
-
-	pua = (void *) vmalloc_to_phys(pua);
-	if (WARN_ON_ONCE_RM(!pua))
-		return H_HARDWARE;
-
-	mem = mm_iommu_lookup_rm(kvm->mm, *pua, pgsize);
-	if (!mem)
-		return H_TOO_HARD;
-
-	mm_iommu_mapped_dec(mem);
-
-	*pua = 0;
-
-	return H_SUCCESS;
-}
-
-static long kvmppc_rm_tce_iommu_unmap(struct kvm *kvm,
-		struct iommu_table *tbl, unsigned long entry)
-{
-	enum dma_data_direction dir = DMA_NONE;
-	unsigned long hpa = 0;
-	long ret;
-
-	if (iommu_tce_xchg_rm(tbl, entry, &hpa, &dir))
-		/*
-		 * real mode xchg can fail if struct page crosses
-		 * a page boundary
-		 */
-		return H_TOO_HARD;
-
-	if (dir == DMA_NONE)
-		return H_SUCCESS;
-
-	ret = kvmppc_rm_tce_iommu_mapped_dec(kvm, tbl, entry);
-	if (ret)
-		iommu_tce_xchg_rm(tbl, entry, &hpa, &dir);
-
-	return ret;
-}
-
-static long kvmppc_rm_tce_iommu_map(struct kvm *kvm, struct iommu_table *tbl,
-		unsigned long entry, unsigned long ua,
-		enum dma_data_direction dir)
-{
-	long ret;
-	unsigned long hpa = 0;
-	unsigned long *pua = IOMMU_TABLE_USERSPACE_ENTRY(tbl, entry);
-	struct mm_iommu_table_group_mem_t *mem;
-
-	if (!pua)
-		/* it_userspace allocation might be delayed */
-		return H_TOO_HARD;
-
-	mem = mm_iommu_lookup_rm(kvm->mm, ua, 1ULL << tbl->it_page_shift);
-	if (!mem)
-		return H_TOO_HARD;
-
-	if (WARN_ON_ONCE_RM(mm_iommu_ua_to_hpa_rm(mem, ua, &hpa)))
-		return H_HARDWARE;
-
-	pua = (void *) vmalloc_to_phys(pua);
-	if (WARN_ON_ONCE_RM(!pua))
-		return H_HARDWARE;
-
-	if (WARN_ON_ONCE_RM(mm_iommu_mapped_inc(mem)))
-		return H_CLOSED;
-
-	ret = iommu_tce_xchg_rm(tbl, entry, &hpa, &dir);
-	if (ret) {
-		mm_iommu_mapped_dec(mem);
-		/*
-		 * real mode xchg can fail if struct page crosses
-		 * a page boundary
-		 */
-		return H_TOO_HARD;
-	}
-
-	if (dir != DMA_NONE)
-		kvmppc_rm_tce_iommu_mapped_dec(kvm, tbl, entry);
-
-	*pua = ua;
-
-	return 0;
-}
-
-long kvmppc_rm_h_put_tce(struct kvm_vcpu *vcpu, unsigned long liobn,
-		unsigned long ioba, unsigned long tce)
-{
-	struct kvmppc_spapr_tce_table *stt;
-	long ret;
-	struct kvmppc_spapr_tce_iommu_table *stit;
-	unsigned long entry, ua = 0;
-	enum dma_data_direction dir;
-
-	/* udbg_printf("H_PUT_TCE(): liobn=0x%lx ioba=0x%lx, tce=0x%lx\n", */
-	/* 	    liobn, ioba, tce); */
-
-	/* For radix, we might be in virtual mode, so punt */
-	if (kvm_is_radix(vcpu->kvm))
-		return H_TOO_HARD;
-
-	stt = kvmppc_find_table(vcpu->kvm, liobn);
-	if (!stt)
-		return H_TOO_HARD;
-
-	ret = kvmppc_ioba_validate(stt, ioba, 1);
-	if (ret != H_SUCCESS)
-		return ret;
-
-	ret = kvmppc_tce_validate(stt, tce);
-	if (ret != H_SUCCESS)
-		return ret;
-
-	dir = iommu_tce_direction(tce);
-	if ((dir != DMA_NONE) && kvmppc_gpa_to_ua(vcpu->kvm,
-			tce & ~(TCE_PCI_READ | TCE_PCI_WRITE), &ua, NULL))
-		return H_PARAMETER;
-
-	entry = ioba >> stt->page_shift;
-
-	list_for_each_entry_lockless(stit, &stt->iommu_tables, next) {
-		if (dir == DMA_NONE)
-			ret = kvmppc_rm_tce_iommu_unmap(vcpu->kvm,
-					stit->tbl, entry);
-		else
-			ret = kvmppc_rm_tce_iommu_map(vcpu->kvm,
-					stit->tbl, entry, ua, dir);
-
-		if (ret == H_SUCCESS)
-			continue;
-
-		if (ret == H_TOO_HARD)
-			return ret;
-
-		WARN_ON_ONCE_RM(1);
-		kvmppc_rm_clear_tce(stit->tbl, entry);
-	}
-
-	kvmppc_tce_put(stt, entry, tce);
-
-	return H_SUCCESS;
-}
-
-static long kvmppc_rm_ua_to_hpa(struct kvm_vcpu *vcpu,
-		unsigned long ua, unsigned long *phpa)
-{
-	pte_t *ptep, pte;
-	unsigned shift = 0;
-
-	ptep = __find_linux_pte_or_hugepte(vcpu->arch.pgdir, ua, NULL, &shift);
-	if (!ptep || !pte_present(*ptep))
-		return -ENXIO;
-	pte = *ptep;
-
-	if (!shift)
-		shift = PAGE_SHIFT;
-
-	/* Avoid handling anything potentially complicated in realmode */
-	if (shift > PAGE_SHIFT)
-		return -EAGAIN;
-
-	if (!pte_young(pte))
-		return -EAGAIN;
-
-	*phpa = (pte_pfn(pte) << PAGE_SHIFT) | (ua & ((1ULL << shift) - 1)) |
-			(ua & ~PAGE_MASK);
-
-	return 0;
-}
-
-long kvmppc_rm_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 *stt;
-	long i, ret = H_SUCCESS;
-	unsigned long tces, entry, ua = 0;
-	unsigned long *rmap = NULL;
-	bool prereg = false;
-	struct kvmppc_spapr_tce_iommu_table *stit;
-
-	/* For radix, we might be in virtual mode, so punt */
-	if (kvm_is_radix(vcpu->kvm))
-		return H_TOO_HARD;
-
-	stt = kvmppc_find_table(vcpu->kvm, liobn);
-	if (!stt)
-		return H_TOO_HARD;
-
-	entry = ioba >> stt->page_shift;
-	/*
-	 * The spec says that the maximum size of the list is 512 TCEs
-	 * so the whole table addressed resides in 4K page
-	 */
-	if (npages > 512)
-		return H_PARAMETER;
-
-	if (tce_list & (SZ_4K - 1))
-		return H_PARAMETER;
-
-	ret = kvmppc_ioba_validate(stt, ioba, npages);
-	if (ret != H_SUCCESS)
-		return ret;
-
-	if (mm_iommu_preregistered(vcpu->kvm->mm)) {
-		/*
-		 * We get here if guest memory was pre-registered which
-		 * is normally VFIO case and gpa->hpa translation does not
-		 * depend on hpt.
-		 */
-		struct mm_iommu_table_group_mem_t *mem;
-
-		if (kvmppc_gpa_to_ua(vcpu->kvm, tce_list, &ua, NULL))
-			return H_TOO_HARD;
-
-		mem = mm_iommu_lookup_rm(vcpu->kvm->mm, ua, IOMMU_PAGE_SIZE_4K);
-		if (mem)
-			prereg = mm_iommu_ua_to_hpa_rm(mem, ua, &tces) == 0;
-	}
-
-	if (!prereg) {
-		/*
-		 * This is usually a case of a guest with emulated devices only
-		 * when TCE list is not in preregistered memory.
-		 * We do not require memory to be preregistered in this case
-		 * so lock rmap and do __find_linux_pte_or_hugepte().
-		 */
-		if (kvmppc_gpa_to_ua(vcpu->kvm, tce_list, &ua, &rmap))
-			return H_TOO_HARD;
-
-		rmap = (void *) vmalloc_to_phys(rmap);
-		if (WARN_ON_ONCE_RM(!rmap))
-			return H_HARDWARE;
-
-		/*
-		 * Synchronize with the MMU notifier callbacks in
-		 * book3s_64_mmu_hv.c (kvm_unmap_hva_hv etc.).
-		 * While we have the rmap lock, code running on other CPUs
-		 * cannot finish unmapping the host real page that backs
-		 * this guest real page, so we are OK to access the host
-		 * real page.
-		 */
-		lock_rmap(rmap);
-		if (kvmppc_rm_ua_to_hpa(vcpu, ua, &tces)) {
-			ret = H_TOO_HARD;
-			goto unlock_exit;
-		}
-	}
-
-	for (i = 0; i < npages; ++i) {
-		unsigned long tce = be64_to_cpu(((u64 *)tces)[i]);
-
-		ret = kvmppc_tce_validate(stt, tce);
-		if (ret != H_SUCCESS)
-			goto unlock_exit;
-
-		ua = 0;
-		if (kvmppc_gpa_to_ua(vcpu->kvm,
-				tce & ~(TCE_PCI_READ | TCE_PCI_WRITE),
-				&ua, NULL))
-			return H_PARAMETER;
-
-		list_for_each_entry_lockless(stit, &stt->iommu_tables, next) {
-			ret = kvmppc_rm_tce_iommu_map(vcpu->kvm,
-					stit->tbl, entry + i, ua,
-					iommu_tce_direction(tce));
-
-			if (ret == H_SUCCESS)
-				continue;
-
-			if (ret == H_TOO_HARD)
-				goto unlock_exit;
-
-			WARN_ON_ONCE_RM(1);
-			kvmppc_rm_clear_tce(stit->tbl, entry);
-		}
-
-		kvmppc_tce_put(stt, entry + i, tce);
-	}
-
-unlock_exit:
-	if (rmap)
-		unlock_rmap(rmap);
-
-	return ret;
-}
-
-long kvmppc_rm_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 *stt;
-	long i, ret;
-	struct kvmppc_spapr_tce_iommu_table *stit;
-
-	/* For radix, we might be in virtual mode, so punt */
-	if (kvm_is_radix(vcpu->kvm))
-		return H_TOO_HARD;
-
-	stt = kvmppc_find_table(vcpu->kvm, liobn);
-	if (!stt)
-		return H_TOO_HARD;
-
-	ret = kvmppc_ioba_validate(stt, ioba, npages);
-	if (ret != H_SUCCESS)
-		return ret;
-
-	/* Check permission bits only to allow userspace poison TCE for debug */
-	if (tce_value & (TCE_PCI_WRITE | TCE_PCI_READ))
-		return H_PARAMETER;
-
-	list_for_each_entry_lockless(stit, &stt->iommu_tables, next) {
-		unsigned long entry = ioba >> stit->tbl->it_page_shift;
-
-		for (i = 0; i < npages; ++i) {
-			ret = kvmppc_rm_tce_iommu_unmap(vcpu->kvm,
-					stit->tbl, entry + i);
-
-			if (ret == H_SUCCESS)
-				continue;
-
-			if (ret == H_TOO_HARD)
-				return ret;
-
-			WARN_ON_ONCE_RM(1);
-			kvmppc_rm_clear_tce(stit->tbl, entry);
-		}
-	}
-
-	for (i = 0; i < npages; ++i, ioba += (1ULL << stt->page_shift))
-		kvmppc_tce_put(stt, ioba >> stt->page_shift, tce_value);
-
-	return H_SUCCESS;
-}
-
-/* This can be called in either virtual mode or real mode */
-long kvmppc_h_get_tce(struct kvm_vcpu *vcpu, unsigned long liobn,
-		      unsigned long ioba)
-{
-	struct kvmppc_spapr_tce_table *stt;
-	long ret;
-	unsigned long idx;
-	struct page *page;
-	u64 *tbl;
-
-	stt = kvmppc_find_table(vcpu->kvm, liobn);
-	if (!stt)
-		return H_TOO_HARD;
-
-	ret = kvmppc_ioba_validate(stt, ioba, 1);
-	if (ret != H_SUCCESS)
-		return ret;
-
-	idx = (ioba >> stt->page_shift) - stt->offset;
-	page = stt->pages[idx / TCES_PER_PAGE];
-	tbl = (u64 *)page_address(page);
-
-	vcpu->arch.gpr[4] = tbl[idx % TCES_PER_PAGE];
-
-	return H_SUCCESS;
-}
-EXPORT_SYMBOL_GPL(kvmppc_h_get_tce);
-
-#endif /* KVM_BOOK3S_HV_POSSIBLE */