Release 4.14 arch/powerpc/kvm/e500_mmu.c

/*
 * Copyright (C) 2008-2013 Freescale Semiconductor, Inc. All rights reserved.
 *
 * Author: Yu Liu, yu.liu@freescale.com
 *         Scott Wood, scottwood@freescale.com
 *         Ashish Kalra, ashish.kalra@freescale.com
 *         Varun Sethi, varun.sethi@freescale.com
 *         Alexander Graf, agraf@suse.de
 *
 * Description:
 * This file is based on arch/powerpc/kvm/44x_tlb.c,
 * by Hollis Blanchard <hollisb@us.ibm.com>.
 *
 * 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.
 */

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/kvm.h>
#include <linux/kvm_host.h>
#include <linux/highmem.h>
#include <linux/log2.h>
#include <linux/uaccess.h>
#include <linux/sched.h>
#include <linux/rwsem.h>
#include <linux/vmalloc.h>
#include <linux/hugetlb.h>
#include <asm/kvm_ppc.h>

#include "e500.h"
#include "trace_booke.h"
#include "timing.h"
#include "e500_mmu_host.h"



static inline unsigned int gtlb0_get_next_victim(
		struct kvmppc_vcpu_e500 *vcpu_e500)
{
	unsigned int victim;

	victim = vcpu_e500->gtlb_nv[0]++;
	if (unlikely(vcpu_e500->gtlb_nv[0] >= vcpu_e500->gtlb_params[0].ways))
		vcpu_e500->gtlb_nv[0] = 0;

	return victim;
}

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static int tlb0_set_base(gva_t addr, int sets, int ways)
{
	int set_base;

	set_base = (addr >> PAGE_SHIFT) & (sets - 1);
	set_base *= ways;

	return set_base;
}

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static int gtlb0_set_base(struct kvmppc_vcpu_e500 *vcpu_e500, gva_t addr)
{
	return tlb0_set_base(addr, vcpu_e500->gtlb_params[0].sets,
			     vcpu_e500->gtlb_params[0].ways);
}

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static unsigned int get_tlb_esel(struct kvm_vcpu *vcpu, int tlbsel)
{
	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
	int esel = get_tlb_esel_bit(vcpu);

	if (tlbsel == 0) {
		esel &= vcpu_e500->gtlb_params[0].ways - 1;
		esel += gtlb0_set_base(vcpu_e500, vcpu->arch.shared->mas2);
	} else {
		esel &= vcpu_e500->gtlb_params[tlbsel].entries - 1;
	}

	return esel;
}

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/* Search the guest TLB for a matching entry. */


static int kvmppc_e500_tlb_index(struct kvmppc_vcpu_e500 *vcpu_e500,
		gva_t eaddr, int tlbsel, unsigned int pid, int as)
{
	int size = vcpu_e500->gtlb_params[tlbsel].entries;
	unsigned int set_base, offset;
	int i;

	if (tlbsel == 0) {
		set_base = gtlb0_set_base(vcpu_e500, eaddr);
		size = vcpu_e500->gtlb_params[0].ways;
	} else {
		if (eaddr < vcpu_e500->tlb1_min_eaddr ||
				eaddr > vcpu_e500->tlb1_max_eaddr)
			return -1;
		set_base = 0;
	}

	offset = vcpu_e500->gtlb_offset[tlbsel];

	for (i = 0; i < size; i++) {
		struct kvm_book3e_206_tlb_entry *tlbe =
			&vcpu_e500->gtlb_arch[offset + set_base + i];
		unsigned int tid;

		if (eaddr < get_tlb_eaddr(tlbe))
			continue;

		if (eaddr > get_tlb_end(tlbe))
			continue;

		tid = get_tlb_tid(tlbe);
		if (tid && (tid != pid))
			continue;

		if (!get_tlb_v(tlbe))
			continue;

		if (get_tlb_ts(tlbe) != as && as != -1)
			continue;

		return set_base + i;
	}

	return -1;
}

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static inline void kvmppc_e500_deliver_tlb_miss(struct kvm_vcpu *vcpu,
		gva_t eaddr, int as)
{
	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
	unsigned int victim, tsized;
	int tlbsel;

	/* since we only have two TLBs, only lower bit is used. */
	tlbsel = (vcpu->arch.shared->mas4 >> 28) & 0x1;
	victim = (tlbsel == 0) ? gtlb0_get_next_victim(vcpu_e500) : 0;
	tsized = (vcpu->arch.shared->mas4 >> 7) & 0x1f;

	vcpu->arch.shared->mas0 = MAS0_TLBSEL(tlbsel) | MAS0_ESEL(victim)
		| MAS0_NV(vcpu_e500->gtlb_nv[tlbsel]);
	vcpu->arch.shared->mas1 = MAS1_VALID | (as ? MAS1_TS : 0)
		| MAS1_TID(get_tlbmiss_tid(vcpu))
		| MAS1_TSIZE(tsized);
	vcpu->arch.shared->mas2 = (eaddr & MAS2_EPN)
		| (vcpu->arch.shared->mas4 & MAS2_ATTRIB_MASK);
	vcpu->arch.shared->mas7_3 &= MAS3_U0 | MAS3_U1 | MAS3_U2 | MAS3_U3;
	vcpu->arch.shared->mas6 = (vcpu->arch.shared->mas6 & MAS6_SPID1)
		| (get_cur_pid(vcpu) << 16)
		| (as ? MAS6_SAS : 0);
}

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static void kvmppc_recalc_tlb1map_range(struct kvmppc_vcpu_e500 *vcpu_e500)
{
	int size = vcpu_e500->gtlb_params[1].entries;
	unsigned int offset;
	gva_t eaddr;
	int i;

	vcpu_e500->tlb1_min_eaddr = ~0UL;
	vcpu_e500->tlb1_max_eaddr = 0;
	offset = vcpu_e500->gtlb_offset[1];

	for (i = 0; i < size; i++) {
		struct kvm_book3e_206_tlb_entry *tlbe =
			&vcpu_e500->gtlb_arch[offset + i];

		if (!get_tlb_v(tlbe))
			continue;

		eaddr = get_tlb_eaddr(tlbe);
		vcpu_e500->tlb1_min_eaddr =
				min(vcpu_e500->tlb1_min_eaddr, eaddr);

		eaddr = get_tlb_end(tlbe);
		vcpu_e500->tlb1_max_eaddr =
				max(vcpu_e500->tlb1_max_eaddr, eaddr);
	}
}

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static int kvmppc_need_recalc_tlb1map_range(struct kvmppc_vcpu_e500 *vcpu_e500,
				struct kvm_book3e_206_tlb_entry *gtlbe)
{
	unsigned long start, end, size;

	size = get_tlb_bytes(gtlbe);
	start = get_tlb_eaddr(gtlbe) & ~(size - 1);
	end = start + size - 1;

	return vcpu_e500->tlb1_min_eaddr == start ||
			vcpu_e500->tlb1_max_eaddr == end;
}

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/* This function is supposed to be called for a adding a new valid tlb entry */


static void kvmppc_set_tlb1map_range(struct kvm_vcpu *vcpu,
				struct kvm_book3e_206_tlb_entry *gtlbe)
{
	unsigned long start, end, size;
	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);

	if (!get_tlb_v(gtlbe))
		return;

	size = get_tlb_bytes(gtlbe);
	start = get_tlb_eaddr(gtlbe) & ~(size - 1);
	end = start + size - 1;

	vcpu_e500->tlb1_min_eaddr = min(vcpu_e500->tlb1_min_eaddr, start);
	vcpu_e500->tlb1_max_eaddr = max(vcpu_e500->tlb1_max_eaddr, end);
}

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static inline int kvmppc_e500_gtlbe_invalidate(
				struct kvmppc_vcpu_e500 *vcpu_e500,
				int tlbsel, int esel)
{
	struct kvm_book3e_206_tlb_entry *gtlbe =
		get_entry(vcpu_e500, tlbsel, esel);

	if (unlikely(get_tlb_iprot(gtlbe)))
		return -1;

	if (tlbsel == 1 && kvmppc_need_recalc_tlb1map_range(vcpu_e500, gtlbe))
		kvmppc_recalc_tlb1map_range(vcpu_e500);

	gtlbe->mas1 = 0;

	return 0;
}

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int kvmppc_e500_emul_mt_mmucsr0(struct kvmppc_vcpu_e500 *vcpu_e500, ulong value)
{
	int esel;

	if (value & MMUCSR0_TLB0FI)
		for (esel = 0; esel < vcpu_e500->gtlb_params[0].entries; esel++)
			kvmppc_e500_gtlbe_invalidate(vcpu_e500, 0, esel);
	if (value & MMUCSR0_TLB1FI)
		for (esel = 0; esel < vcpu_e500->gtlb_params[1].entries; esel++)
			kvmppc_e500_gtlbe_invalidate(vcpu_e500, 1, esel);

	/* Invalidate all host shadow mappings */
	kvmppc_core_flush_tlb(&vcpu_e500->vcpu);

	return EMULATE_DONE;
}

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int kvmppc_e500_emul_tlbivax(struct kvm_vcpu *vcpu, gva_t ea)
{
	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
	unsigned int ia;
	int esel, tlbsel;

	ia = (ea >> 2) & 0x1;

	/* since we only have two TLBs, only lower bit is used. */
	tlbsel = (ea >> 3) & 0x1;

	if (ia) {
		/* invalidate all entries */
		for (esel = 0; esel < vcpu_e500->gtlb_params[tlbsel].entries;
		     esel++)
			kvmppc_e500_gtlbe_invalidate(vcpu_e500, tlbsel, esel);
	} else {
		ea &= 0xfffff000;
		esel = kvmppc_e500_tlb_index(vcpu_e500, ea, tlbsel,
				get_cur_pid(vcpu), -1);
		if (esel >= 0)
			kvmppc_e500_gtlbe_invalidate(vcpu_e500, tlbsel, esel);
	}

	/* Invalidate all host shadow mappings */
	kvmppc_core_flush_tlb(&vcpu_e500->vcpu);

	return EMULATE_DONE;
}

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static void tlbilx_all(struct kvmppc_vcpu_e500 *vcpu_e500, int tlbsel,
		       int pid, int type)
{
	struct kvm_book3e_206_tlb_entry *tlbe;
	int tid, esel;

	/* invalidate all entries */
	for (esel = 0; esel < vcpu_e500->gtlb_params[tlbsel].entries; esel++) {
		tlbe = get_entry(vcpu_e500, tlbsel, esel);
		tid = get_tlb_tid(tlbe);
		if (type == 0 || tid == pid) {
			inval_gtlbe_on_host(vcpu_e500, tlbsel, esel);
			kvmppc_e500_gtlbe_invalidate(vcpu_e500, tlbsel, esel);
		}
	}
}

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static void tlbilx_one(struct kvmppc_vcpu_e500 *vcpu_e500, int pid,
		       gva_t ea)
{
	int tlbsel, esel;

	for (tlbsel = 0; tlbsel < 2; tlbsel++) {
		esel = kvmppc_e500_tlb_index(vcpu_e500, ea, tlbsel, pid, -1);
		if (esel >= 0) {
			inval_gtlbe_on_host(vcpu_e500, tlbsel, esel);
			kvmppc_e500_gtlbe_invalidate(vcpu_e500, tlbsel, esel);
			break;
		}
	}
}

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int kvmppc_e500_emul_tlbilx(struct kvm_vcpu *vcpu, int type, gva_t ea)
{
	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
	int pid = get_cur_spid(vcpu);

	if (type == 0 || type == 1) {
		tlbilx_all(vcpu_e500, 0, pid, type);
		tlbilx_all(vcpu_e500, 1, pid, type);
	} else if (type == 3) {
		tlbilx_one(vcpu_e500, pid, ea);
	}

	return EMULATE_DONE;
}

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int kvmppc_e500_emul_tlbre(struct kvm_vcpu *vcpu)
{
	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
	int tlbsel, esel;
	struct kvm_book3e_206_tlb_entry *gtlbe;

	tlbsel = get_tlb_tlbsel(vcpu);
	esel = get_tlb_esel(vcpu, tlbsel);

	gtlbe = get_entry(vcpu_e500, tlbsel, esel);
	vcpu->arch.shared->mas0 &= ~MAS0_NV(~0);
	vcpu->arch.shared->mas0 |= MAS0_NV(vcpu_e500->gtlb_nv[tlbsel]);
	vcpu->arch.shared->mas1 = gtlbe->mas1;
	vcpu->arch.shared->mas2 = gtlbe->mas2;
	vcpu->arch.shared->mas7_3 = gtlbe->mas7_3;

	return EMULATE_DONE;
}

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int kvmppc_e500_emul_tlbsx(struct kvm_vcpu *vcpu, gva_t ea)
{
	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
	int as = !!get_cur_sas(vcpu);
	unsigned int pid = get_cur_spid(vcpu);
	int esel, tlbsel;
	struct kvm_book3e_206_tlb_entry *gtlbe = NULL;

	for (tlbsel = 0; tlbsel < 2; tlbsel++) {
		esel = kvmppc_e500_tlb_index(vcpu_e500, ea, tlbsel, pid, as);
		if (esel >= 0) {
			gtlbe = get_entry(vcpu_e500, tlbsel, esel);
			break;
		}
	}

	if (gtlbe) {
		esel &= vcpu_e500->gtlb_params[tlbsel].ways - 1;

		vcpu->arch.shared->mas0 = MAS0_TLBSEL(tlbsel) | MAS0_ESEL(esel)
			| MAS0_NV(vcpu_e500->gtlb_nv[tlbsel]);
		vcpu->arch.shared->mas1 = gtlbe->mas1;
		vcpu->arch.shared->mas2 = gtlbe->mas2;
		vcpu->arch.shared->mas7_3 = gtlbe->mas7_3;
	} else {
		int victim;

		/* since we only have two TLBs, only lower bit is used. */
		tlbsel = vcpu->arch.shared->mas4 >> 28 & 0x1;
		victim = (tlbsel == 0) ? gtlb0_get_next_victim(vcpu_e500) : 0;

		vcpu->arch.shared->mas0 = MAS0_TLBSEL(tlbsel)
			| MAS0_ESEL(victim)
			| MAS0_NV(vcpu_e500->gtlb_nv[tlbsel]);
		vcpu->arch.shared->mas1 =
			  (vcpu->arch.shared->mas6 & MAS6_SPID0)
			| ((vcpu->arch.shared->mas6 & MAS6_SAS) ? MAS1_TS : 0)
			| (vcpu->arch.shared->mas4 & MAS4_TSIZED(~0));
		vcpu->arch.shared->mas2 &= MAS2_EPN;
		vcpu->arch.shared->mas2 |= vcpu->arch.shared->mas4 &
					   MAS2_ATTRIB_MASK;
		vcpu->arch.shared->mas7_3 &= MAS3_U0 | MAS3_U1 |
					     MAS3_U2 | MAS3_U3;
	}

	kvmppc_set_exit_type(vcpu, EMULATED_TLBSX_EXITS);
	return EMULATE_DONE;
}

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int kvmppc_e500_emul_tlbwe(struct kvm_vcpu *vcpu)
{
	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
	struct kvm_book3e_206_tlb_entry *gtlbe;
	int tlbsel, esel;
	int recal = 0;
	int idx;

	tlbsel = get_tlb_tlbsel(vcpu);
	esel = get_tlb_esel(vcpu, tlbsel);

	gtlbe = get_entry(vcpu_e500, tlbsel, esel);

	if (get_tlb_v(gtlbe)) {
		inval_gtlbe_on_host(vcpu_e500, tlbsel, esel);
		if ((tlbsel == 1) &&
			kvmppc_need_recalc_tlb1map_range(vcpu_e500, gtlbe))
			recal = 1;
	}

	gtlbe->mas1 = vcpu->arch.shared->mas1;
	gtlbe->mas2 = vcpu->arch.shared->mas2;
	if (!(vcpu->arch.shared->msr & MSR_CM))
		gtlbe->mas2 &= 0xffffffffUL;
	gtlbe->mas7_3 = vcpu->arch.shared->mas7_3;

	trace_kvm_booke206_gtlb_write(vcpu->arch.shared->mas0, gtlbe->mas1,
	                              gtlbe->mas2, gtlbe->mas7_3);

	if (tlbsel == 1) {
		/*
                 * If a valid tlb1 entry is overwritten then recalculate the
                 * min/max TLB1 map address range otherwise no need to look
                 * in tlb1 array.
                 */
		if (recal)
			kvmppc_recalc_tlb1map_range(vcpu_e500);
		else
			kvmppc_set_tlb1map_range(vcpu, gtlbe);
	}

	idx = srcu_read_lock(&vcpu->kvm->srcu);

	/* Invalidate shadow mappings for the about-to-be-clobbered TLBE. */
	if (tlbe_is_host_safe(vcpu, gtlbe)) {
		u64 eaddr = get_tlb_eaddr(gtlbe);
		u64 raddr = get_tlb_raddr(gtlbe);

		if (tlbsel == 0) {
			gtlbe->mas1 &= ~MAS1_TSIZE(~0);
			gtlbe->mas1 |= MAS1_TSIZE(BOOK3E_PAGESZ_4K);
		}

		/* Premap the faulting page */
		kvmppc_mmu_map(vcpu, eaddr, raddr, index_of(tlbsel, esel));
	}

	srcu_read_unlock(&vcpu->kvm->srcu, idx);

	kvmppc_set_exit_type(vcpu, EMULATED_TLBWE_EXITS);
	return EMULATE_DONE;
}

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Alexander Graf
192
60.95%
2
33.33%
Scott Wood
78
24.76%
2
33.33%
Hollis Blanchard
44
13.97%
1
16.67%
Liu Yu
1
0.32%
1
16.67%
Total
315
100.00%
6
100.00%



static int kvmppc_e500_tlb_search(struct kvm_vcpu *vcpu,
				  gva_t eaddr, unsigned int pid, int as)
{
	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
	int esel, tlbsel;

	for (tlbsel = 0; tlbsel < 2; tlbsel++) {
		esel = kvmppc_e500_tlb_index(vcpu_e500, eaddr, tlbsel, pid, as);
		if (esel >= 0)
			return index_of(tlbsel, esel);
	}

	return -1;
}

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Alexander Graf
49
58.33%
1
33.33%
Hollis Blanchard
28
33.33%
1
33.33%
Scott Wood
7
8.33%
1
33.33%
Total
84
100.00%
3
100.00%

/* 'linear_address' is actually an encoding of AS|PID|EADDR . */


int kvmppc_core_vcpu_translate(struct kvm_vcpu *vcpu,
                               struct kvm_translation *tr)
{
	int index;
	gva_t eaddr;
	u8 pid;
	u8 as;

	eaddr = tr->linear_address;
	pid = (tr->linear_address >> 32) & 0xff;
	as = (tr->linear_address >> 40) & 0x1;

	index = kvmppc_e500_tlb_search(vcpu, eaddr, pid, as);
	if (index < 0) {
		tr->valid = 0;
		return 0;
	}

	tr->physical_address = kvmppc_mmu_xlate(vcpu, index, eaddr);
	/* XXX what does "writeable" and "usermode" even mean? */
	tr->valid = 1;

	return 0;
}


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Alexander Graf
86
78.18%
3
50.00%
Hollis Blanchard
14
12.73%
1
16.67%
Liu Yu
6
5.45%
1
16.67%
Scott Wood
4
3.64%
1
16.67%
Total
110
100.00%
6
100.00%



int kvmppc_mmu_itlb_index(struct kvm_vcpu *vcpu, gva_t eaddr)
{
	unsigned int as = !!(vcpu->arch.shared->msr & MSR_IS);

	return kvmppc_e500_tlb_search(vcpu, eaddr, get_cur_pid(vcpu), as);
}

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Alexander Graf
43
93.48%
2
40.00%
Scott Wood
2
4.35%
2
40.00%
Liu Yu
1
2.17%
1
20.00%
Total
46
100.00%
5
100.00%



int kvmppc_mmu_dtlb_index(struct kvm_vcpu *vcpu, gva_t eaddr)
{
	unsigned int as = !!(vcpu->arch.shared->msr & MSR_DS);

	return kvmppc_e500_tlb_search(vcpu, eaddr, get_cur_pid(vcpu), as);
}

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Alexander Graf
36
78.26%
1
20.00%
Scott Wood
6
13.04%
3
60.00%
Hollis Blanchard
4
8.70%
1
20.00%
Total
46
100.00%
5
100.00%



void kvmppc_mmu_itlb_miss(struct kvm_vcpu *vcpu)
{
	unsigned int as = !!(vcpu->arch.shared->msr & MSR_IS);

	kvmppc_e500_deliver_tlb_miss(vcpu, vcpu->arch.pc, as);
}

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41
100.00%
2
100.00%



void kvmppc_mmu_dtlb_miss(struct kvm_vcpu *vcpu)
{
	unsigned int as = !!(vcpu->arch.shared->msr & MSR_DS);

	kvmppc_e500_deliver_tlb_miss(vcpu, vcpu->arch.fault_dear, as);
}

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41
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2
100.00%
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41
100.00%
2
100.00%



gpa_t kvmppc_mmu_xlate(struct kvm_vcpu *vcpu, unsigned int index,
			gva_t eaddr)
{
	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
	struct kvm_book3e_206_tlb_entry *gtlbe;
	u64 pgmask;

	gtlbe = get_entry(vcpu_e500, tlbsel_of(index), esel_of(index));
	pgmask = get_tlb_bytes(gtlbe) - 1;

	return get_tlb_raddr(gtlbe) | (eaddr & pgmask);
}

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73
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2
100.00%



void kvmppc_mmu_destroy_e500(struct kvm_vcpu *vcpu)
{
}

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Alexander Graf
8
88.89%
2
66.67%
Aneesh Kumar K.V
1
11.11%
1
33.33%
Total
9
100.00%
3
100.00%

/*****************************************/



static void free_gtlb(struct kvmppc_vcpu_e500 *vcpu_e500)
{
	int i;

	kvmppc_core_flush_tlb(&vcpu_e500->vcpu);
	kfree(vcpu_e500->g2h_tlb1_map);
	kfree(vcpu_e500->gtlb_priv[0]);
	kfree(vcpu_e500->gtlb_priv[1]);

	if (vcpu_e500->shared_tlb_pages) {
		vfree((void *)(round_down((uintptr_t)vcpu_e500->gtlb_arch,
					  PAGE_SIZE)));

		for (i = 0; i < vcpu_e500->num_shared_tlb_pages; i++) {
			set_page_dirty_lock(vcpu_e500->shared_tlb_pages[i]);
			put_page(vcpu_e500->shared_tlb_pages[i]);
		}

		vcpu_e500->num_shared_tlb_pages = 0;

		kfree(vcpu_e500->shared_tlb_pages);
		vcpu_e500->shared_tlb_pages = NULL;
	} else {
		kfree(vcpu_e500->gtlb_arch);
	}

	vcpu_e500->gtlb_arch = NULL;
}

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Hollis Blanchard
11
7.33%
1
16.67%
Alexander Graf
4
2.67%
1
16.67%
Total
150
100.00%
6
100.00%



void kvmppc_get_sregs_e500_tlb(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
{
	sregs->u.e.mas0 = vcpu->arch.