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/*
* 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.
*
* Copyright 2010-2011 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/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>
/* 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)
#define HPTE_V_HVLOCK 0x40UL
static inline long lock_hpte(unsigned long *hpte, unsigned long bits)
{
unsigned long tmp, old;
asm volatile(" ldarx %0,0,%2\n"
" and. %1,%0,%3\n"
" bne 2f\n"
" ori %0,%0,%4\n"
" stdcx. %0,0,%2\n"
" beq+ 2f\n"
" li %1,%3\n"
"2: isync"
: "=&r" (tmp), "=&r" (old)
: "r" (hpte), "r" (bits), "i" (HPTE_V_HVLOCK)
: "cc", "memory");
return old == 0;
}
long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags,
long pte_index, unsigned long pteh, unsigned long ptel)
{
unsigned long porder;
struct kvm *kvm = vcpu->kvm;
unsigned long i, lpn, pa;
unsigned long *hpte;
/* only handle 4k, 64k and 16M pages for now */
porder = 12;
if (pteh & HPTE_V_LARGE) {
if (cpu_has_feature(CPU_FTR_ARCH_206) &&
(ptel & 0xf000) == 0x1000) {
/* 64k page */
porder = 16;
} else if ((ptel & 0xff000) == 0) {
/* 16M page */
porder = 24;
/* lowest AVA bit must be 0 for 16M pages */
if (pteh & 0x80)
return H_PARAMETER;
} else
return H_PARAMETER;
}
lpn = (ptel & HPTE_R_RPN) >> kvm->arch.ram_porder;
if (lpn >= kvm->arch.ram_npages || porder > kvm->arch.ram_porder)
return H_PARAMETER;
pa = kvm->arch.ram_pginfo[lpn].pfn << PAGE_SHIFT;
if (!pa)
return H_PARAMETER;
/* Check WIMG */
if ((ptel & HPTE_R_WIMG) != HPTE_R_M &&
(ptel & HPTE_R_WIMG) != (HPTE_R_W | HPTE_R_I | HPTE_R_M))
return H_PARAMETER;
pteh &= ~0x60UL;
ptel &= ~(HPTE_R_PP0 - kvm->arch.ram_psize);
ptel |= pa;
if (pte_index >= (HPT_NPTEG << 3))
return H_PARAMETER;
if (likely((flags & H_EXACT) == 0)) {
pte_index &= ~7UL;
hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4));
for (i = 0; ; ++i) {
if (i == 8)
return H_PTEG_FULL;
if ((*hpte & HPTE_V_VALID) == 0 &&
lock_hpte(hpte, HPTE_V_HVLOCK | HPTE_V_VALID))
break;
hpte += 2;
}
} else {
i = 0;
hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4));
if (!lock_hpte(hpte, HPTE_V_HVLOCK | HPTE_V_VALID))
return H_PTEG_FULL;
}
hpte[1] = ptel;
eieio();
hpte[0] = pteh;
asm volatile("ptesync" : : : "memory");
atomic_inc(&kvm->arch.ram_pginfo[lpn].refcnt);
vcpu->arch.gpr[4] = pte_index + i;
return H_SUCCESS;
}
#define LOCK_TOKEN (*(u32 *)(&get_paca()->lock_token))
static inline int try_lock_tlbie(unsigned int *lock)
{
unsigned int tmp, old;
unsigned int token = LOCK_TOKEN;
asm volatile("1:lwarx %1,0,%2\n"
" cmpwi cr0,%1,0\n"
" bne 2f\n"
" stwcx. %3,0,%2\n"
" bne- 1b\n"
" isync\n"
"2:"
: "=&r" (tmp), "=&r" (old)
: "r" (lock), "r" (token)
: "cc", "memory");
return old == 0;
}
long kvmppc_h_remove(struct kvm_vcpu *vcpu, unsigned long flags,
unsigned long pte_index, unsigned long avpn,
unsigned long va)
{
struct kvm *kvm = vcpu->kvm;
unsigned long *hpte;
unsigned long v, r, rb;
if (pte_index >= (HPT_NPTEG << 3))
return H_PARAMETER;
hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4));
while (!lock_hpte(hpte, HPTE_V_HVLOCK))
cpu_relax();
if ((hpte[0] & HPTE_V_VALID) == 0 ||
((flags & H_AVPN) && (hpte[0] & ~0x7fUL) != avpn) ||
((flags & H_ANDCOND) && (hpte[0] & avpn) != 0)) {
hpte[0] &= ~HPTE_V_HVLOCK;
return H_NOT_FOUND;
}
if (atomic_read(&kvm->online_vcpus) == 1)
flags |= H_LOCAL;
vcpu->arch.gpr[4] = v = hpte[0] & ~HPTE_V_HVLOCK;
vcpu->arch.gpr[5] = r = hpte[1];
rb = compute_tlbie_rb(v, r, pte_index);
hpte[0] = 0;
if (!(flags & H_LOCAL)) {
while(!try_lock_tlbie(&kvm->arch.tlbie_lock))
cpu_relax();
asm volatile("ptesync" : : : "memory");
asm volatile(PPC_TLBIE(%1,%0)"; eieio; tlbsync"
: : "r" (rb), "r" (kvm->arch.lpid));
asm volatile("ptesync" : : : "memory");
kvm->arch.tlbie_lock = 0;
} else {
asm volatile("ptesync" : : : "memory");
asm volatile("tlbiel %0" : : "r" (rb));
asm volatile("ptesync" : : : "memory");
}
return H_SUCCESS;
}
long kvmppc_h_bulk_remove(struct kvm_vcpu *vcpu)
{
struct kvm *kvm = vcpu->kvm;
unsigned long *args = &vcpu->arch.gpr[4];
unsigned long *hp, tlbrb[4];
long int i, found;
long int n_inval = 0;
unsigned long flags, req, pte_index;
long int local = 0;
long int ret = H_SUCCESS;
if (atomic_read(&kvm->online_vcpus) == 1)
local = 1;
for (i = 0; i < 4; ++i) {
pte_index = args[i * 2];
flags = pte_index >> 56;
pte_index &= ((1ul << 56) - 1);
req = flags >> 6;
flags &= 3;
if (req == 3)
break;
if (req != 1 || flags == 3 ||
pte_index >= (HPT_NPTEG << 3)) {
/* parameter error */
args[i * 2] = ((0xa0 | flags) << 56) + pte_index;
ret = H_PARAMETER;
break;
}
hp = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4));
while (!lock_hpte(hp, HPTE_V_HVLOCK))
cpu_relax();
found = 0;
if (hp[0] & HPTE_V_VALID) {
switch (flags & 3) {
case 0: /* absolute */
found = 1;
break;
case 1: /* andcond */
if (!(hp[0] & args[i * 2 + 1]))
found = 1;
break;
case 2: /* AVPN */
if ((hp[0] & ~0x7fUL) == args[i * 2 + 1])
found = 1;
break;
}
}
if (!found) {
hp[0] &= ~HPTE_V_HVLOCK;
args[i * 2] = ((0x90 | flags) << 56) + pte_index;
continue;
}
/* insert R and C bits from PTE */
flags |= (hp[1] >> 5) & 0x0c;
args[i * 2] = ((0x80 | flags) << 56) + pte_index;
tlbrb[n_inval++] = compute_tlbie_rb(hp[0], hp[1], pte_index);
hp[0] = 0;
}
if (n_inval == 0)
return ret;
if (!local) {
while(!try_lock_tlbie(&kvm->arch.tlbie_lock))
cpu_relax();
asm volatile("ptesync" : : : "memory");
for (i = 0; i < n_inval; ++i)
asm volatile(PPC_TLBIE(%1,%0)
: : "r" (tlbrb[i]), "r" (kvm->arch.lpid));
asm volatile("eieio; tlbsync; ptesync" : : : "memory");
kvm->arch.tlbie_lock = 0;
} else {
asm volatile("ptesync" : : : "memory");
for (i = 0; i < n_inval; ++i)
asm volatile("tlbiel %0" : : "r" (tlbrb[i]));
asm volatile("ptesync" : : : "memory");
}
return ret;
}
long kvmppc_h_protect(struct kvm_vcpu *vcpu, unsigned long flags,
unsigned long pte_index, unsigned long avpn,
unsigned long va)
{
struct kvm *kvm = vcpu->kvm;
unsigned long *hpte;
unsigned long v, r, rb;
if (pte_index >= (HPT_NPTEG << 3))
return H_PARAMETER;
hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4));
while (!lock_hpte(hpte, HPTE_V_HVLOCK))
cpu_relax();
if ((hpte[0] & HPTE_V_VALID) == 0 ||
((flags & H_AVPN) && (hpte[0] & ~0x7fUL) != avpn)) {
hpte[0] &= ~HPTE_V_HVLOCK;
return H_NOT_FOUND;
}
if (atomic_read(&kvm->online_vcpus) == 1)
flags |= H_LOCAL;
v = hpte[0];
r = hpte[1] & ~(HPTE_R_PP0 | HPTE_R_PP | HPTE_R_N |
HPTE_R_KEY_HI | HPTE_R_KEY_LO);
r |= (flags << 55) & HPTE_R_PP0;
r |= (flags << 48) & HPTE_R_KEY_HI;
r |= flags & (HPTE_R_PP | HPTE_R_N | HPTE_R_KEY_LO);
rb = compute_tlbie_rb(v, r, pte_index);
hpte[0] = v & ~HPTE_V_VALID;
if (!(flags & H_LOCAL)) {
while(!try_lock_tlbie(&kvm->arch.tlbie_lock))
cpu_relax();
asm volatile("ptesync" : : : "memory");
asm volatile(PPC_TLBIE(%1,%0)"; eieio; tlbsync"
: : "r" (rb), "r" (kvm->arch.lpid));
asm volatile("ptesync" : : : "memory");
kvm->arch.tlbie_lock = 0;
} else {
asm volatile("ptesync" : : : "memory");
asm volatile("tlbiel %0" : : "r" (rb));
asm volatile("ptesync" : : : "memory");
}
hpte[1] = r;
eieio();
hpte[0] = v & ~HPTE_V_HVLOCK;
asm volatile("ptesync" : : : "memory");
return H_SUCCESS;
}
static unsigned long reverse_xlate(struct kvm *kvm, unsigned long realaddr)
{
long int i;
unsigned long offset, rpn;
offset = realaddr & (kvm->arch.ram_psize - 1);
rpn = (realaddr - offset) >> PAGE_SHIFT;
for (i = 0; i < kvm->arch.ram_npages; ++i)
if (rpn == kvm->arch.ram_pginfo[i].pfn)
return (i << PAGE_SHIFT) + offset;
return HPTE_R_RPN; /* all 1s in the RPN field */
}
long kvmppc_h_read(struct kvm_vcpu *vcpu, unsigned long flags,
unsigned long pte_index)
{
struct kvm *kvm = vcpu->kvm;
unsigned long *hpte, r;
int i, n = 1;
if (pte_index >= (HPT_NPTEG << 3))
return H_PARAMETER;
if (flags & H_READ_4) {
pte_index &= ~3;
n = 4;
}
for (i = 0; i < n; ++i, ++pte_index) {
hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4));
r = hpte[1];
if ((flags & H_R_XLATE) && (hpte[0] & HPTE_V_VALID))
r = reverse_xlate(kvm, r & HPTE_R_RPN) |
(r & ~HPTE_R_RPN);
vcpu->arch.gpr[4 + i * 2] = hpte[0];
vcpu->arch.gpr[5 + i * 2] = r;
}
return H_SUCCESS;
}
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