[deliverable/linux.git] / arch / powerpc / kvm / book3s_64_mmu_hv.c

/*
 * 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 <linux/vmalloc.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>

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

/* POWER7 has 10-bit LPIDs, PPC970 has 6-bit LPIDs */
#define MAX_LPID_970	63
#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;
	struct revmap_entry *rev;

	/* Allocate guest's hashed page table */
	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;

	/* Allocate reverse map array */
	rev = vmalloc(sizeof(struct revmap_entry) * HPT_NPTE);
	if (!rev) {
		pr_err("kvmppc_alloc_hpt: Couldn't alloc reverse map array\n");
		goto out_freehpt;
	}
	kvm->arch.revmap = rev;

	/* Allocate the guest's logical partition ID */
	do {
		lpid = find_first_zero_bit(lpid_inuse, NR_LPIDS);
		if (lpid >= NR_LPIDS) {
			pr_err("kvm_alloc_hpt: No LPIDs free\n");
			goto out_freeboth;
		}
	} while (test_and_set_bit(lpid, lpid_inuse));

	kvm->arch.sdr1 = __pa(hpt) | (HPT_ORDER - 18);
	kvm->arch.lpid = lpid;

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

 out_freeboth:
	vfree(rev);
 out_freehpt:
	free_pages(hpt, HPT_ORDER - PAGE_SHIFT);
	return -ENOMEM;
}

void kvmppc_free_hpt(struct kvm *kvm)
{
	clear_bit(kvm->arch.lpid, lpid_inuse);
	vfree(kvm->arch.revmap);
	free_pages(kvm->arch.hpt_virt, HPT_ORDER - PAGE_SHIFT);
}

void kvmppc_map_vrma(struct kvm *kvm, struct kvm_userspace_memory_region *mem)
{
	unsigned long i;
	unsigned long npages;
	unsigned long pa;
	unsigned long *hpte;
	unsigned long hash;
	unsigned long porder = kvm->arch.ram_porder;
	struct revmap_entry *rev;
	unsigned long *physp;

	physp = kvm->arch.slot_phys[mem->slot];
	npages = kvm->arch.slot_npages[mem->slot];

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

	for (i = 0; i < npages; ++i) {
		pa = physp[i];
		if (!pa)
			break;
		pa &= PAGE_MASK;
		/* 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.
		 */
		hash = (hash << 3) + 7;
		hpte = (unsigned long *) (kvm->arch.hpt_virt + (hash << 4));
		/* HPTE low word - RPN, protection, etc. */
		hpte[1] = pa | HPTE_R_R | HPTE_R_C | HPTE_R_M | PP_RWXX;
		smp_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;

		/* Reverse map info */
		rev = &kvm->arch.revmap[hash];
		rev->guest_rpte = (i << porder) | HPTE_R_R | HPTE_R_C |
			HPTE_R_M | PP_RWXX;
	}
}

int kvmppc_mmu_hv_init(void)
{
	unsigned long host_lpid, rsvd_lpid;

	if (!cpu_has_feature(CPU_FTR_HVMODE))
		return -EINVAL;

	memset(lpid_inuse, 0, sizeof(lpid_inuse));

	if (cpu_has_feature(CPU_FTR_ARCH_206)) {
		host_lpid = mfspr(SPRN_LPID);	/* POWER7 */
		rsvd_lpid = LPID_RSVD;
	} else {
		host_lpid = 0;			/* PPC970 */
		rsvd_lpid = MAX_LPID_970;
	}

	set_bit(host_lpid, lpid_inuse);
	/* rsvd_lpid is reserved for use in partition switching */
	set_bit(rsvd_lpid, 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;

	if (cpu_has_feature(CPU_FTR_ARCH_206))
		vcpu->arch.slb_nr = 32;		/* POWER7 */
	else
		vcpu->arch.slb_nr = 64;

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

	vcpu->arch.hflags |= BOOK3S_HFLAG_SLB;
}
Commit	Line	Data
de56a948 PM	1	/*
	2	* This program is free software; you can redistribute it and/or modify
	3	* it under the terms of the GNU General Public License, version 2, as
	4	* published by the Free Software Foundation.
	5	*
	6	* This program is distributed in the hope that it will be useful,
	7	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	8	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	9	* GNU General Public License for more details.
	10	*
	11	* You should have received a copy of the GNU General Public License
	12	* along with this program; if not, write to the Free Software
	13	* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
	14	*
	15	* Copyright 2010 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
	16	*/
	17
	18	#include <linux/types.h>
	19	#include <linux/string.h>
	20	#include <linux/kvm.h>
	21	#include <linux/kvm_host.h>
	22	#include <linux/highmem.h>
	23	#include <linux/gfp.h>
	24	#include <linux/slab.h>
	25	#include <linux/hugetlb.h>
8936dda4	26	#include <linux/vmalloc.h>
de56a948 PM	27
	28	#include <asm/tlbflush.h>
	29	#include <asm/kvm_ppc.h>
	30	#include <asm/kvm_book3s.h>
	31	#include <asm/mmu-hash64.h>
	32	#include <asm/hvcall.h>
	33	#include <asm/synch.h>
	34	#include <asm/ppc-opcode.h>
	35	#include <asm/cputable.h>
	36
de56a948 PM	37	/* Pages in the VRMA are 16MB pages */
	38	#define VRMA_PAGE_ORDER 24
	39	#define VRMA_VSID 0x1ffffffUL /* 1TB VSID reserved for VRMA */
	40
9e368f29 PM	41	/* POWER7 has 10-bit LPIDs, PPC970 has 6-bit LPIDs */
9e368f29 PM	42	#define MAX_LPID_970 63
de56a948 PM	43	#define NR_LPIDS (LPID_RSVD + 1)
	44	unsigned long lpid_inuse[BITS_TO_LONGS(NR_LPIDS)];
	45
	46	long kvmppc_alloc_hpt(struct kvm *kvm)
	47	{
	48	unsigned long hpt;
	49	unsigned long lpid;
8936dda4	50	struct revmap_entry *rev;
de56a948	51
8936dda4	52	/* Allocate guest's hashed page table */
de56a948 PM	53	hpt = __get_free_pages(GFP_KERNEL\|__GFP_ZERO\|__GFP_REPEAT\|__GFP_NOWARN,
	54	HPT_ORDER - PAGE_SHIFT);
	55	if (!hpt) {
	56	pr_err("kvm_alloc_hpt: Couldn't alloc HPT\n");
	57	return -ENOMEM;
	58	}
	59	kvm->arch.hpt_virt = hpt;
	60
8936dda4 PM	61	/* Allocate reverse map array */
	62	rev = vmalloc(sizeof(struct revmap_entry) * HPT_NPTE);
	63	if (!rev) {
	64	pr_err("kvmppc_alloc_hpt: Couldn't alloc reverse map array\n");
	65	goto out_freehpt;
	66	}
	67	kvm->arch.revmap = rev;
	68
	69	/* Allocate the guest's logical partition ID */
de56a948 PM	70	do {
	71	lpid = find_first_zero_bit(lpid_inuse, NR_LPIDS);
	72	if (lpid >= NR_LPIDS) {
	73	pr_err("kvm_alloc_hpt: No LPIDs free\n");
8936dda4	74	goto out_freeboth;
de56a948 PM	75	}
	76	} while (test_and_set_bit(lpid, lpid_inuse));
	77
	78	kvm->arch.sdr1 = __pa(hpt) \| (HPT_ORDER - 18);
	79	kvm->arch.lpid = lpid;
de56a948 PM	80
	81	pr_info("KVM guest htab at %lx, LPID %lx\n", hpt, lpid);
	82	return 0;
8936dda4 PM	83
	84	out_freeboth:
	85	vfree(rev);
	86	out_freehpt:
	87	free_pages(hpt, HPT_ORDER - PAGE_SHIFT);
	88	return -ENOMEM;
de56a948 PM	89	}
	90
	91	void kvmppc_free_hpt(struct kvm *kvm)
	92	{
de56a948	93	clear_bit(kvm->arch.lpid, lpid_inuse);
8936dda4	94	vfree(kvm->arch.revmap);
de56a948	95	free_pages(kvm->arch.hpt_virt, HPT_ORDER - PAGE_SHIFT);
de56a948 PM	96	}
	97
	98	void kvmppc_map_vrma(struct kvm kvm, struct kvm_userspace_memory_region mem)
	99	{
	100	unsigned long i;
b2b2f165 PM	101	unsigned long npages;
b2b2f165 PM	102	unsigned long pa;
de56a948 PM	103	unsigned long *hpte;
de56a948 PM	104	unsigned long hash;
8936dda4 PM	105	unsigned long porder = kvm->arch.ram_porder;
8936dda4 PM	106	struct revmap_entry *rev;
b2b2f165	107	unsigned long *physp;
de56a948	108
b2b2f165 PM	109	physp = kvm->arch.slot_phys[mem->slot];
b2b2f165 PM	110	npages = kvm->arch.slot_npages[mem->slot];
de56a948 PM	111
de56a948 PM	112	/* VRMA can't be > 1TB */
8936dda4 PM	113	if (npages > 1ul << (40 - porder))
8936dda4 PM	114	npages = 1ul << (40 - porder);
de56a948 PM	115	/* Can't use more than 1 HPTE per HPTEG */
	116	if (npages > HPT_NPTEG)
	117	npages = HPT_NPTEG;
	118
	119	for (i = 0; i < npages; ++i) {
b2b2f165 PM	120	pa = physp[i];
b2b2f165 PM	121	if (!pa)
aa04b4cc	122	break;
b2b2f165	123	pa &= PAGE_MASK;
de56a948 PM	124	/* can't use hpt_hash since va > 64 bits */
	125	hash = (i ^ (VRMA_VSID ^ (VRMA_VSID << 25))) & HPT_HASH_MASK;
	126	/*
	127	* We assume that the hash table is empty and no
	128	* vcpus are using it at this stage. Since we create
	129	* at most one HPTE per HPTEG, we just assume entry 7
	130	* is available and use it.
	131	*/
8936dda4 PM	132	hash = (hash << 3) + 7;
8936dda4 PM	133	hpte = (unsigned long *) (kvm->arch.hpt_virt + (hash << 4));
de56a948	134	/* HPTE low word - RPN, protection, etc. */
b2b2f165	135	hpte[1] = pa \| HPTE_R_R \| HPTE_R_C \| HPTE_R_M \| PP_RWXX;
8936dda4	136	smp_wmb();
de56a948 PM	137	hpte[0] = HPTE_V_1TB_SEG \| (VRMA_VSID << (40 - 16)) \|
	138	(i << (VRMA_PAGE_ORDER - 16)) \| HPTE_V_BOLTED \|
	139	HPTE_V_LARGE \| HPTE_V_VALID;
8936dda4 PM	140
	141	/* Reverse map info */
	142	rev = &kvm->arch.revmap[hash];
	143	rev->guest_rpte = (i << porder) \| HPTE_R_R \| HPTE_R_C \|
	144	HPTE_R_M \| PP_RWXX;
de56a948 PM	145	}
	146	}
	147
	148	int kvmppc_mmu_hv_init(void)
	149	{
9e368f29 PM	150	unsigned long host_lpid, rsvd_lpid;
	151
	152	if (!cpu_has_feature(CPU_FTR_HVMODE))
de56a948	153	return -EINVAL;
9e368f29	154
de56a948	155	memset(lpid_inuse, 0, sizeof(lpid_inuse));
9e368f29 PM	156
	157	if (cpu_has_feature(CPU_FTR_ARCH_206)) {
	158	host_lpid = mfspr(SPRN_LPID); /* POWER7 */
	159	rsvd_lpid = LPID_RSVD;
	160	} else {
	161	host_lpid = 0; /* PPC970 */
	162	rsvd_lpid = MAX_LPID_970;
	163	}
	164
	165	set_bit(host_lpid, lpid_inuse);
	166	/* rsvd_lpid is reserved for use in partition switching */
	167	set_bit(rsvd_lpid, lpid_inuse);
de56a948 PM	168
	169	return 0;
	170	}
	171
	172	void kvmppc_mmu_destroy(struct kvm_vcpu *vcpu)
	173	{
	174	}
	175
	176	static void kvmppc_mmu_book3s_64_hv_reset_msr(struct kvm_vcpu *vcpu)
	177	{
	178	kvmppc_set_msr(vcpu, MSR_SF \| MSR_ME);
	179	}
	180
	181	static int kvmppc_mmu_book3s_64_hv_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
	182	struct kvmppc_pte *gpte, bool data)
	183	{
	184	return -ENOENT;
	185	}
	186
	187	void kvmppc_mmu_book3s_hv_init(struct kvm_vcpu *vcpu)
	188	{
	189	struct kvmppc_mmu *mmu = &vcpu->arch.mmu;
	190
9e368f29 PM	191	if (cpu_has_feature(CPU_FTR_ARCH_206))
	192	vcpu->arch.slb_nr = 32; /* POWER7 */
	193	else
	194	vcpu->arch.slb_nr = 64;
de56a948 PM	195
	196	mmu->xlate = kvmppc_mmu_book3s_64_hv_xlate;
	197	mmu->reset_msr = kvmppc_mmu_book3s_64_hv_reset_msr;
	198
	199	vcpu->arch.hflags \|= BOOK3S_HFLAG_SLB;
	200	}