arch/powerpc/kvm/book3s_64_mmu_hv.c - kernel/msm-4.19 - Gitiles

 /*
  * 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>
  */

 #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 <asm/tlbflush.h>
 #include <asm/kvm_ppc.h>
 #include <asm/kvm_book3s.h>
 #include <asm/mmu-hash64.h>
 #include <asm/hvcall.h>
 #include <asm/synch.h>
 #include <asm/ppc-opcode.h>
 #include <asm/cputable.h>

 /* For now use fixed-size 16MB page table */
 #define HPT_ORDER	24
 #define HPT_NPTEG	(1ul << (HPT_ORDER - 7))	/* 128B per pteg */
 #define HPT_HASH_MASK	(HPT_NPTEG - 1)

 /* Pages in the VRMA are 16MB pages */
 #define VRMA_PAGE_ORDER	24
 #define VRMA_VSID	0x1ffffffUL	/* 1TB VSID reserved for VRMA */

 #define NR_LPIDS	(LPID_RSVD + 1)
 unsigned long lpid_inuse[BITS_TO_LONGS(NR_LPIDS)];

 long kvmppc_alloc_hpt(struct kvm *kvm)
 {
 	unsigned long hpt;
 	unsigned long lpid;

 	hpt = __get_free_pages(GFP_KERNEL|__GFP_ZERO|__GFP_REPEAT|__GFP_NOWARN,
 			       HPT_ORDER - PAGE_SHIFT);
 	if (!hpt) {
 		pr_err("kvm_alloc_hpt: Couldn't alloc HPT\n");
 		return -ENOMEM;
 	}
 	kvm->arch.hpt_virt = hpt;

 	do {
 		lpid = find_first_zero_bit(lpid_inuse, NR_LPIDS);
 		if (lpid >= NR_LPIDS) {
 			pr_err("kvm_alloc_hpt: No LPIDs free\n");
 			free_pages(hpt, HPT_ORDER - PAGE_SHIFT);
 			return -ENOMEM;
 		}
 	} while (test_and_set_bit(lpid, lpid_inuse));

 	kvm->arch.sdr1 = __pa(hpt) | (HPT_ORDER - 18);
 	kvm->arch.lpid = lpid;
 	kvm->arch.host_sdr1 = mfspr(SPRN_SDR1);
 	kvm->arch.host_lpid = mfspr(SPRN_LPID);
 	kvm->arch.host_lpcr = mfspr(SPRN_LPCR);

 	pr_info("KVM guest htab at %lx, LPID %lx\n", hpt, lpid);
 	return 0;
 }

 void kvmppc_free_hpt(struct kvm *kvm)
 {
 	unsigned long i;
 	struct kvmppc_pginfo *pginfo;

 	clear_bit(kvm->arch.lpid, lpid_inuse);
 	free_pages(kvm->arch.hpt_virt, HPT_ORDER - PAGE_SHIFT);

 	if (kvm->arch.ram_pginfo) {
 		pginfo = kvm->arch.ram_pginfo;
 		kvm->arch.ram_pginfo = NULL;
 		for (i = 0; i < kvm->arch.ram_npages; ++i)
 			put_page(pfn_to_page(pginfo[i].pfn));
 		kfree(pginfo);
 	}
 }

 static unsigned long user_page_size(unsigned long addr)
 {
 	struct vm_area_struct *vma;
 	unsigned long size = PAGE_SIZE;

 	down_read(&current->mm->mmap_sem);
 	vma = find_vma(current->mm, addr);
 	if (vma)
 		size = vma_kernel_pagesize(vma);
 	up_read(&current->mm->mmap_sem);
 	return size;
 }

 static pfn_t hva_to_pfn(unsigned long addr)
 {
 	struct page *page[1];
 	int npages;

 	might_sleep();

 	npages = get_user_pages_fast(addr, 1, 1, page);

 	if (unlikely(npages != 1))
 		return 0;

 	return page_to_pfn(page[0]);
 }

 long kvmppc_prepare_vrma(struct kvm *kvm,
 			 struct kvm_userspace_memory_region *mem)
 {
 	unsigned long psize, porder;
 	unsigned long i, npages;
 	struct kvmppc_pginfo *pginfo;
 	pfn_t pfn;
 	unsigned long hva;

 	/* First see what page size we have */
 	psize = user_page_size(mem->userspace_addr);
 	/* For now, only allow 16MB pages */
 	if (psize != 1ul << VRMA_PAGE_ORDER || (mem->memory_size & (psize - 1))) {
 		pr_err("bad psize=%lx memory_size=%llx @ %llx\n",
 		       psize, mem->memory_size, mem->userspace_addr);
 		return -EINVAL;
 	}
 	porder = __ilog2(psize);

 	npages = mem->memory_size >> porder;
 	pginfo = kzalloc(npages * sizeof(struct kvmppc_pginfo), GFP_KERNEL);
 	if (!pginfo) {
 		pr_err("kvmppc_prepare_vrma: couldn't alloc %lu bytes\n",
 		       npages * sizeof(struct kvmppc_pginfo));
 		return -ENOMEM;
 	}

 	for (i = 0; i < npages; ++i) {
 		hva = mem->userspace_addr + (i << porder);
 		if (user_page_size(hva) != psize)
 			goto err;
 		pfn = hva_to_pfn(hva);
 		if (pfn == 0) {
 			pr_err("oops, no pfn for hva %lx\n", hva);
 			goto err;
 		}
 		if (pfn & ((1ul << (porder - PAGE_SHIFT)) - 1)) {
 			pr_err("oops, unaligned pfn %llx\n", pfn);
 			put_page(pfn_to_page(pfn));
 			goto err;
 		}
 		pginfo[i].pfn = pfn;
 	}

 	kvm->arch.ram_npages = npages;
 	kvm->arch.ram_psize = psize;
 	kvm->arch.ram_porder = porder;
 	kvm->arch.ram_pginfo = pginfo;

 	return 0;

  err:
 	kfree(pginfo);
 	return -EINVAL;
 }

 void kvmppc_map_vrma(struct kvm *kvm, struct kvm_userspace_memory_region *mem)
 {
 	unsigned long i;
 	unsigned long npages = kvm->arch.ram_npages;
 	unsigned long pfn;
 	unsigned long *hpte;
 	unsigned long hash;
 	struct kvmppc_pginfo *pginfo = kvm->arch.ram_pginfo;

 	if (!pginfo)
 		return;

 	/* VRMA can't be > 1TB */
 	if (npages > 1ul << (40 - kvm->arch.ram_porder))
 		npages = 1ul << (40 - kvm->arch.ram_porder);
 	/* Can't use more than 1 HPTE per HPTEG */
 	if (npages > HPT_NPTEG)
 		npages = HPT_NPTEG;

 	for (i = 0; i < npages; ++i) {
 		pfn = pginfo[i].pfn;
 		/* can't use hpt_hash since va > 64 bits */
 		hash = (i ^ (VRMA_VSID ^ (VRMA_VSID << 25))) & HPT_HASH_MASK;
 		/*
 		 * We assume that the hash table is empty and no
 		 * vcpus are using it at this stage.  Since we create
 		 * at most one HPTE per HPTEG, we just assume entry 7
 		 * is available and use it.
 		 */
 		hpte = (unsigned long *) (kvm->arch.hpt_virt + (hash << 7));
 		hpte += 7 * 2;
 		/* HPTE low word - RPN, protection, etc. */
 		hpte[1] = (pfn << PAGE_SHIFT) | HPTE_R_R | HPTE_R_C |
 			HPTE_R_M | PP_RWXX;
 		wmb();
 		hpte[0] = HPTE_V_1TB_SEG | (VRMA_VSID << (40 - 16)) |
 			(i << (VRMA_PAGE_ORDER - 16)) | HPTE_V_BOLTED |
 			HPTE_V_LARGE | HPTE_V_VALID;
 	}
 }

 int kvmppc_mmu_hv_init(void)
 {
 	if (!cpu_has_feature(CPU_FTR_HVMODE_206))
 		return -EINVAL;
 	memset(lpid_inuse, 0, sizeof(lpid_inuse));
 	set_bit(mfspr(SPRN_LPID), lpid_inuse);
 	set_bit(LPID_RSVD, lpid_inuse);

 	return 0;
 }

 void kvmppc_mmu_destroy(struct kvm_vcpu *vcpu)
 {
 }

 static void kvmppc_mmu_book3s_64_hv_reset_msr(struct kvm_vcpu *vcpu)
 {
 	kvmppc_set_msr(vcpu, MSR_SF | MSR_ME);
 }

 static int kvmppc_mmu_book3s_64_hv_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
 				struct kvmppc_pte *gpte, bool data)
 {
 	return -ENOENT;
 }

 void kvmppc_mmu_book3s_hv_init(struct kvm_vcpu *vcpu)
 {
 	struct kvmppc_mmu *mmu = &vcpu->arch.mmu;

 	vcpu->arch.slb_nr = 32;		/* Assume POWER7 for now */

 	mmu->xlate = kvmppc_mmu_book3s_64_hv_xlate;
 	mmu->reset_msr = kvmppc_mmu_book3s_64_hv_reset_msr;

 	vcpu->arch.hflags |= BOOK3S_HFLAG_SLB;
 }
	/*
	* 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>
	*/

	#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 <asm/tlbflush.h>
	#include <asm/kvm_ppc.h>
	#include <asm/kvm_book3s.h>
	#include <asm/mmu-hash64.h>
	#include <asm/hvcall.h>
	#include <asm/synch.h>
	#include <asm/ppc-opcode.h>
	#include <asm/cputable.h>

	/* For now use fixed-size 16MB page table */
	#define HPT_ORDER 24
	#define HPT_NPTEG (1ul << (HPT_ORDER - 7)) /* 128B per pteg */
	#define HPT_HASH_MASK (HPT_NPTEG - 1)

	/* Pages in the VRMA are 16MB pages */
	#define VRMA_PAGE_ORDER 24
	#define VRMA_VSID 0x1ffffffUL /* 1TB VSID reserved for VRMA */

	#define NR_LPIDS (LPID_RSVD + 1)
	unsigned long lpid_inuse[BITS_TO_LONGS(NR_LPIDS)];

	long kvmppc_alloc_hpt(struct kvm *kvm)
	{
	unsigned long hpt;
	unsigned long lpid;

	hpt = __get_free_pages(GFP_KERNEL\|__GFP_ZERO\|__GFP_REPEAT\|__GFP_NOWARN,
	HPT_ORDER - PAGE_SHIFT);
	if (!hpt) {
	pr_err("kvm_alloc_hpt: Couldn't alloc HPT\n");
	return -ENOMEM;
	}
	kvm->arch.hpt_virt = hpt;

	do {
	lpid = find_first_zero_bit(lpid_inuse, NR_LPIDS);
	if (lpid >= NR_LPIDS) {
	pr_err("kvm_alloc_hpt: No LPIDs free\n");
	free_pages(hpt, HPT_ORDER - PAGE_SHIFT);
	return -ENOMEM;
	}
	} while (test_and_set_bit(lpid, lpid_inuse));

	kvm->arch.sdr1 = __pa(hpt) \| (HPT_ORDER - 18);
	kvm->arch.lpid = lpid;
	kvm->arch.host_sdr1 = mfspr(SPRN_SDR1);
	kvm->arch.host_lpid = mfspr(SPRN_LPID);
	kvm->arch.host_lpcr = mfspr(SPRN_LPCR);

	pr_info("KVM guest htab at %lx, LPID %lx\n", hpt, lpid);
	return 0;
	}

	void kvmppc_free_hpt(struct kvm *kvm)
	{
	unsigned long i;
	struct kvmppc_pginfo *pginfo;

	clear_bit(kvm->arch.lpid, lpid_inuse);
	free_pages(kvm->arch.hpt_virt, HPT_ORDER - PAGE_SHIFT);

	if (kvm->arch.ram_pginfo) {
	pginfo = kvm->arch.ram_pginfo;
	kvm->arch.ram_pginfo = NULL;
	for (i = 0; i < kvm->arch.ram_npages; ++i)
	put_page(pfn_to_page(pginfo[i].pfn));
	kfree(pginfo);
	}
	}

	static unsigned long user_page_size(unsigned long addr)
	{
	struct vm_area_struct *vma;
	unsigned long size = PAGE_SIZE;

	down_read(&current->mm->mmap_sem);
	vma = find_vma(current->mm, addr);
	if (vma)
	size = vma_kernel_pagesize(vma);
	up_read(&current->mm->mmap_sem);
	return size;
	}

	static pfn_t hva_to_pfn(unsigned long addr)
	{
	struct page *page[1];
	int npages;

	might_sleep();

	npages = get_user_pages_fast(addr, 1, 1, page);

	if (unlikely(npages != 1))
	return 0;

	return page_to_pfn(page[0]);
	}

	long kvmppc_prepare_vrma(struct kvm *kvm,
	struct kvm_userspace_memory_region *mem)
	{
	unsigned long psize, porder;
	unsigned long i, npages;
	struct kvmppc_pginfo *pginfo;
	pfn_t pfn;
	unsigned long hva;

	/* First see what page size we have */
	psize = user_page_size(mem->userspace_addr);
	/* For now, only allow 16MB pages */
	if (psize != 1ul << VRMA_PAGE_ORDER \|\| (mem->memory_size & (psize - 1))) {
	pr_err("bad psize=%lx memory_size=%llx @ %llx\n",
	psize, mem->memory_size, mem->userspace_addr);
	return -EINVAL;
	}
	porder = __ilog2(psize);

	npages = mem->memory_size >> porder;
	pginfo = kzalloc(npages * sizeof(struct kvmppc_pginfo), GFP_KERNEL);
	if (!pginfo) {
	pr_err("kvmppc_prepare_vrma: couldn't alloc %lu bytes\n",
	npages * sizeof(struct kvmppc_pginfo));
	return -ENOMEM;
	}

	for (i = 0; i < npages; ++i) {
	hva = mem->userspace_addr + (i << porder);
	if (user_page_size(hva) != psize)
	goto err;
	pfn = hva_to_pfn(hva);
	if (pfn == 0) {
	pr_err("oops, no pfn for hva %lx\n", hva);
	goto err;
	}
	if (pfn & ((1ul << (porder - PAGE_SHIFT)) - 1)) {
	pr_err("oops, unaligned pfn %llx\n", pfn);
	put_page(pfn_to_page(pfn));
	goto err;
	}
	pginfo[i].pfn = pfn;
	}

	kvm->arch.ram_npages = npages;
	kvm->arch.ram_psize = psize;
	kvm->arch.ram_porder = porder;
	kvm->arch.ram_pginfo = pginfo;

	return 0;

	err:
	kfree(pginfo);
	return -EINVAL;
	}

	void kvmppc_map_vrma(struct kvm kvm, struct kvm_userspace_memory_region mem)
	{
	unsigned long i;
	unsigned long npages = kvm->arch.ram_npages;
	unsigned long pfn;
	unsigned long *hpte;
	unsigned long hash;
	struct kvmppc_pginfo *pginfo = kvm->arch.ram_pginfo;

	if (!pginfo)
	return;

	/* VRMA can't be > 1TB */
	if (npages > 1ul << (40 - kvm->arch.ram_porder))
	npages = 1ul << (40 - kvm->arch.ram_porder);
	/* Can't use more than 1 HPTE per HPTEG */
	if (npages > HPT_NPTEG)
	npages = HPT_NPTEG;

	for (i = 0; i < npages; ++i) {
	pfn = pginfo[i].pfn;
	/* can't use hpt_hash since va > 64 bits */
	hash = (i ^ (VRMA_VSID ^ (VRMA_VSID << 25))) & HPT_HASH_MASK;
	/*
	* We assume that the hash table is empty and no
	* vcpus are using it at this stage. Since we create
	* at most one HPTE per HPTEG, we just assume entry 7
	* is available and use it.
	*/
	hpte = (unsigned long *) (kvm->arch.hpt_virt + (hash << 7));
	hpte += 7 * 2;
	/* HPTE low word - RPN, protection, etc. */
	hpte[1] = (pfn << PAGE_SHIFT) \| HPTE_R_R \| HPTE_R_C \|
	HPTE_R_M \| PP_RWXX;
	wmb();
	hpte[0] = HPTE_V_1TB_SEG \| (VRMA_VSID << (40 - 16)) \|
	(i << (VRMA_PAGE_ORDER - 16)) \| HPTE_V_BOLTED \|
	HPTE_V_LARGE \| HPTE_V_VALID;
	}
	}

	int kvmppc_mmu_hv_init(void)
	{
	if (!cpu_has_feature(CPU_FTR_HVMODE_206))
	return -EINVAL;
	memset(lpid_inuse, 0, sizeof(lpid_inuse));
	set_bit(mfspr(SPRN_LPID), lpid_inuse);
	set_bit(LPID_RSVD, lpid_inuse);

	return 0;
	}

	void kvmppc_mmu_destroy(struct kvm_vcpu *vcpu)
	{
	}

	static void kvmppc_mmu_book3s_64_hv_reset_msr(struct kvm_vcpu *vcpu)
	{
	kvmppc_set_msr(vcpu, MSR_SF \| MSR_ME);
	}

	static int kvmppc_mmu_book3s_64_hv_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
	struct kvmppc_pte *gpte, bool data)
	{
	return -ENOENT;
	}

	void kvmppc_mmu_book3s_hv_init(struct kvm_vcpu *vcpu)
	{
	struct kvmppc_mmu *mmu = &vcpu->arch.mmu;

	vcpu->arch.slb_nr = 32; /* Assume POWER7 for now */

	mmu->xlate = kvmppc_mmu_book3s_64_hv_xlate;
	mmu->reset_msr = kvmppc_mmu_book3s_64_hv_reset_msr;

	vcpu->arch.hflags \|= BOOK3S_HFLAG_SLB;
	}