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linux/arch/powerpc/kvm/book3s_64_mmu.c
Paul Mackerras 681562cd56 KVM: PPC: Book3S PR: Invalidate SLB entries properly 
At present, if the guest creates a valid SLB (segment lookaside buffer)
entry with the slbmte instruction, then invalidates it with the slbie
instruction, then reads the entry with the slbmfee/slbmfev instructions,
the result of the slbmfee will have the valid bit set, even though the
entry is not actually considered valid by the host.  This is confusing,
if not worse.  This fixes it by zeroing out the orige and origv fields
of the SLB entry structure when the entry is invalidated.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
2013-06-30 03:33:22 +02:00

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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.
*
* 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 SUSE Linux Products GmbH 2009
*
* Authors: Alexander Graf <agraf@suse.de>
*/
#include <linux/types.h>
#include <linux/string.h>
#include <linux/kvm.h>
#include <linux/kvm_host.h>
#include <linux/highmem.h>
#include <asm/tlbflush.h>
#include <asm/kvm_ppc.h>
#include <asm/kvm_book3s.h>
#include <asm/mmu-hash64.h>
/* #define DEBUG_MMU */
#ifdef DEBUG_MMU
#define dprintk(X...) printk(KERN_INFO X)
#else
#define dprintk(X...) do { } while(0)
#endif
static void kvmppc_mmu_book3s_64_reset_msr(struct kvm_vcpu *vcpu)
{
kvmppc_set_msr(vcpu, MSR_SF);
}
static struct kvmppc_slb *kvmppc_mmu_book3s_64_find_slbe(
struct kvm_vcpu *vcpu,
gva_t eaddr)
{
int i;
u64 esid = GET_ESID(eaddr);
u64 esid_1t = GET_ESID_1T(eaddr);
for (i = 0; i < vcpu->arch.slb_nr; i++) {
u64 cmp_esid = esid;
if (!vcpu->arch.slb[i].valid)
continue;
if (vcpu->arch.slb[i].tb)
cmp_esid = esid_1t;
if (vcpu->arch.slb[i].esid == cmp_esid)
return &vcpu->arch.slb[i];
}
dprintk("KVM: No SLB entry found for 0x%lx [%llx | %llx]\n",
eaddr, esid, esid_1t);
for (i = 0; i < vcpu->arch.slb_nr; i++) {
if (vcpu->arch.slb[i].vsid)
dprintk(" %d: %c%c%c %llx %llx\n", i,
vcpu->arch.slb[i].valid ? 'v' : ' ',
vcpu->arch.slb[i].large ? 'l' : ' ',
vcpu->arch.slb[i].tb ? 't' : ' ',
vcpu->arch.slb[i].esid,
vcpu->arch.slb[i].vsid);
}
return NULL;
}
static int kvmppc_slb_sid_shift(struct kvmppc_slb *slbe)
{
return slbe->tb ? SID_SHIFT_1T : SID_SHIFT;
}
static u64 kvmppc_slb_offset_mask(struct kvmppc_slb *slbe)
{
return (1ul << kvmppc_slb_sid_shift(slbe)) - 1;
}
static u64 kvmppc_slb_calc_vpn(struct kvmppc_slb *slb, gva_t eaddr)
{
eaddr &= kvmppc_slb_offset_mask(slb);
return (eaddr >> VPN_SHIFT) |
((slb->vsid) << (kvmppc_slb_sid_shift(slb) - VPN_SHIFT));
}
static u64 kvmppc_mmu_book3s_64_ea_to_vp(struct kvm_vcpu *vcpu, gva_t eaddr,
bool data)
{
struct kvmppc_slb *slb;
slb = kvmppc_mmu_book3s_64_find_slbe(vcpu, eaddr);
if (!slb)
return 0;
return kvmppc_slb_calc_vpn(slb, eaddr);
}
static int kvmppc_mmu_book3s_64_get_pagesize(struct kvmppc_slb *slbe)
{
return slbe->large ? 24 : 12;
}
static u32 kvmppc_mmu_book3s_64_get_page(struct kvmppc_slb *slbe, gva_t eaddr)
{
int p = kvmppc_mmu_book3s_64_get_pagesize(slbe);
return ((eaddr & kvmppc_slb_offset_mask(slbe)) >> p);
}
static hva_t kvmppc_mmu_book3s_64_get_pteg(
struct kvmppc_vcpu_book3s *vcpu_book3s,
struct kvmppc_slb *slbe, gva_t eaddr,
bool second)
{
u64 hash, pteg, htabsize;
u32 ssize;
hva_t r;
u64 vpn;
htabsize = ((1 << ((vcpu_book3s->sdr1 & 0x1f) + 11)) - 1);
vpn = kvmppc_slb_calc_vpn(slbe, eaddr);
ssize = slbe->tb ? MMU_SEGSIZE_1T : MMU_SEGSIZE_256M;
hash = hpt_hash(vpn, kvmppc_mmu_book3s_64_get_pagesize(slbe), ssize);
if (second)
hash = ~hash;
hash &= ((1ULL << 39ULL) - 1ULL);
hash &= htabsize;
hash <<= 7ULL;
pteg = vcpu_book3s->sdr1 & 0xfffffffffffc0000ULL;
pteg |= hash;
dprintk("MMU: page=0x%x sdr1=0x%llx pteg=0x%llx vsid=0x%llx\n",
page, vcpu_book3s->sdr1, pteg, slbe->vsid);
/* When running a PAPR guest, SDR1 contains a HVA address instead
of a GPA */
if (vcpu_book3s->vcpu.arch.papr_enabled)
r = pteg;
else
r = gfn_to_hva(vcpu_book3s->vcpu.kvm, pteg >> PAGE_SHIFT);
if (kvm_is_error_hva(r))
return r;
return r | (pteg & ~PAGE_MASK);
}
static u64 kvmppc_mmu_book3s_64_get_avpn(struct kvmppc_slb *slbe, gva_t eaddr)
{
int p = kvmppc_mmu_book3s_64_get_pagesize(slbe);
u64 avpn;
avpn = kvmppc_mmu_book3s_64_get_page(slbe, eaddr);
avpn |= slbe->vsid << (kvmppc_slb_sid_shift(slbe) - p);
if (p < 24)
avpn >>= ((80 - p) - 56) - 8;
else
avpn <<= 8;
return avpn;
}
static int kvmppc_mmu_book3s_64_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
struct kvmppc_pte *gpte, bool data)
{
struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
struct kvmppc_slb *slbe;
hva_t ptegp;
u64 pteg[16];
u64 avpn = 0;
int i;
u8 key = 0;
bool found = false;
int second = 0;
ulong mp_ea = vcpu->arch.magic_page_ea;
/* Magic page override */
if (unlikely(mp_ea) &&
unlikely((eaddr & ~0xfffULL) == (mp_ea & ~0xfffULL)) &&
!(vcpu->arch.shared->msr & MSR_PR)) {
gpte->eaddr = eaddr;
gpte->vpage = kvmppc_mmu_book3s_64_ea_to_vp(vcpu, eaddr, data);
gpte->raddr = vcpu->arch.magic_page_pa | (gpte->raddr & 0xfff);
gpte->raddr &= KVM_PAM;
gpte->may_execute = true;
gpte->may_read = true;
gpte->may_write = true;
return 0;
}
slbe = kvmppc_mmu_book3s_64_find_slbe(vcpu, eaddr);
if (!slbe)
goto no_seg_found;
avpn = kvmppc_mmu_book3s_64_get_avpn(slbe, eaddr);
if (slbe->tb)
avpn |= SLB_VSID_B_1T;
do_second:
ptegp = kvmppc_mmu_book3s_64_get_pteg(vcpu_book3s, slbe, eaddr, second);
if (kvm_is_error_hva(ptegp))
goto no_page_found;
if(copy_from_user(pteg, (void __user *)ptegp, sizeof(pteg))) {
printk(KERN_ERR "KVM can't copy data from 0x%lx!\n", ptegp);
goto no_page_found;
}
if ((vcpu->arch.shared->msr & MSR_PR) && slbe->Kp)
key = 4;
else if (!(vcpu->arch.shared->msr & MSR_PR) && slbe->Ks)
key = 4;
for (i=0; i<16; i+=2) {
u64 v = pteg[i];
u64 r = pteg[i+1];
/* Valid check */
if (!(v & HPTE_V_VALID))
continue;
/* Hash check */
if ((v & HPTE_V_SECONDARY) != second)
continue;
/* AVPN compare */
if (HPTE_V_COMPARE(avpn, v)) {
u8 pp = (r & HPTE_R_PP) | key;
int eaddr_mask = 0xFFF;
gpte->eaddr = eaddr;
gpte->vpage = kvmppc_mmu_book3s_64_ea_to_vp(vcpu,
eaddr,
data);
if (slbe->large)
eaddr_mask = 0xFFFFFF;
gpte->raddr = (r & HPTE_R_RPN) | (eaddr & eaddr_mask);
gpte->may_execute = ((r & HPTE_R_N) ? false : true);
gpte->may_read = false;
gpte->may_write = false;
switch (pp) {
case 0:
case 1:
case 2:
case 6:
gpte->may_write = true;
/* fall through */
case 3:
case 5:
case 7:
gpte->may_read = true;
break;
}
dprintk("KVM MMU: Translated 0x%lx [0x%llx] -> 0x%llx "
"-> 0x%lx\n",
eaddr, avpn, gpte->vpage, gpte->raddr);
found = true;
break;
}
}
/* Update PTE R and C bits, so the guest's swapper knows we used the
* page */
if (found) {
u32 oldr = pteg[i+1];
if (gpte->may_read) {
/* Set the accessed flag */
pteg[i+1] |= HPTE_R_R;
}
if (gpte->may_write) {
/* Set the dirty flag */
pteg[i+1] |= HPTE_R_C;
} else {
dprintk("KVM: Mapping read-only page!\n");
}
/* Write back into the PTEG */
if (pteg[i+1] != oldr)
copy_to_user((void __user *)ptegp, pteg, sizeof(pteg));
if (!gpte->may_read)
return -EPERM;
return 0;
} else {
dprintk("KVM MMU: No PTE found (ea=0x%lx sdr1=0x%llx "
"ptegp=0x%lx)\n",
eaddr, to_book3s(vcpu)->sdr1, ptegp);
for (i = 0; i < 16; i += 2)
dprintk(" %02d: 0x%llx - 0x%llx (0x%llx)\n",
i, pteg[i], pteg[i+1], avpn);
if (!second) {
second = HPTE_V_SECONDARY;
goto do_second;
}
}
no_page_found:
return -ENOENT;
no_seg_found:
dprintk("KVM MMU: Trigger segment fault\n");
return -EINVAL;
}
static void kvmppc_mmu_book3s_64_slbmte(struct kvm_vcpu *vcpu, u64 rs, u64 rb)
{
struct kvmppc_vcpu_book3s *vcpu_book3s;
u64 esid, esid_1t;
int slb_nr;
struct kvmppc_slb *slbe;
dprintk("KVM MMU: slbmte(0x%llx, 0x%llx)\n", rs, rb);
vcpu_book3s = to_book3s(vcpu);
esid = GET_ESID(rb);
esid_1t = GET_ESID_1T(rb);
slb_nr = rb & 0xfff;
if (slb_nr > vcpu->arch.slb_nr)
return;
slbe = &vcpu->arch.slb[slb_nr];
slbe->large = (rs & SLB_VSID_L) ? 1 : 0;
slbe->tb = (rs & SLB_VSID_B_1T) ? 1 : 0;
slbe->esid = slbe->tb ? esid_1t : esid;
slbe->vsid = (rs & ~SLB_VSID_B) >> (kvmppc_slb_sid_shift(slbe) - 16);
slbe->valid = (rb & SLB_ESID_V) ? 1 : 0;
slbe->Ks = (rs & SLB_VSID_KS) ? 1 : 0;
slbe->Kp = (rs & SLB_VSID_KP) ? 1 : 0;
slbe->nx = (rs & SLB_VSID_N) ? 1 : 0;
slbe->class = (rs & SLB_VSID_C) ? 1 : 0;
slbe->orige = rb & (ESID_MASK | SLB_ESID_V);
slbe->origv = rs;
/* Map the new segment */
kvmppc_mmu_map_segment(vcpu, esid << SID_SHIFT);
}
static u64 kvmppc_mmu_book3s_64_slbmfee(struct kvm_vcpu *vcpu, u64 slb_nr)
{
struct kvmppc_slb *slbe;
if (slb_nr > vcpu->arch.slb_nr)
return 0;
slbe = &vcpu->arch.slb[slb_nr];
return slbe->orige;
}
static u64 kvmppc_mmu_book3s_64_slbmfev(struct kvm_vcpu *vcpu, u64 slb_nr)
{
struct kvmppc_slb *slbe;
if (slb_nr > vcpu->arch.slb_nr)
return 0;
slbe = &vcpu->arch.slb[slb_nr];
return slbe->origv;
}
static void kvmppc_mmu_book3s_64_slbie(struct kvm_vcpu *vcpu, u64 ea)
{
struct kvmppc_slb *slbe;
u64 seg_size;
dprintk("KVM MMU: slbie(0x%llx)\n", ea);
slbe = kvmppc_mmu_book3s_64_find_slbe(vcpu, ea);
if (!slbe)
return;
dprintk("KVM MMU: slbie(0x%llx, 0x%llx)\n", ea, slbe->esid);
slbe->valid = false;
slbe->orige = 0;
slbe->origv = 0;
seg_size = 1ull << kvmppc_slb_sid_shift(slbe);
kvmppc_mmu_flush_segment(vcpu, ea & ~(seg_size - 1), seg_size);
}
static void kvmppc_mmu_book3s_64_slbia(struct kvm_vcpu *vcpu)
{
int i;
dprintk("KVM MMU: slbia()\n");
for (i = 1; i < vcpu->arch.slb_nr; i++) {
vcpu->arch.slb[i].valid = false;
vcpu->arch.slb[i].orige = 0;
vcpu->arch.slb[i].origv = 0;
}
if (vcpu->arch.shared->msr & MSR_IR) {
kvmppc_mmu_flush_segments(vcpu);
kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu));
}
}
static void kvmppc_mmu_book3s_64_mtsrin(struct kvm_vcpu *vcpu, u32 srnum,
ulong value)
{
u64 rb = 0, rs = 0;
/*
* According to Book3 2.01 mtsrin is implemented as:
*
* The SLB entry specified by (RB)32:35 is loaded from register
* RS, as follows.
*
* SLBE Bit Source SLB Field
*
* 0:31 0x0000_0000 ESID-0:31
* 32:35 (RB)32:35 ESID-32:35
* 36 0b1 V
* 37:61 0x00_0000|| 0b0 VSID-0:24
* 62:88 (RS)37:63 VSID-25:51
* 89:91 (RS)33:35 Ks Kp N
* 92 (RS)36 L ((RS)36 must be 0b0)
* 93 0b0 C
*/
dprintk("KVM MMU: mtsrin(0x%x, 0x%lx)\n", srnum, value);
/* ESID = srnum */
rb |= (srnum & 0xf) << 28;
/* Set the valid bit */
rb |= 1 << 27;
/* Index = ESID */
rb |= srnum;
/* VSID = VSID */
rs |= (value & 0xfffffff) << 12;
/* flags = flags */
rs |= ((value >> 28) & 0x7) << 9;
kvmppc_mmu_book3s_64_slbmte(vcpu, rs, rb);
}
static void kvmppc_mmu_book3s_64_tlbie(struct kvm_vcpu *vcpu, ulong va,
bool large)
{
u64 mask = 0xFFFFFFFFFULL;
dprintk("KVM MMU: tlbie(0x%lx)\n", va);
if (large)
mask = 0xFFFFFF000ULL;
kvmppc_mmu_pte_vflush(vcpu, va >> 12, mask);
}
static int kvmppc_mmu_book3s_64_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid,
u64 *vsid)
{
ulong ea = esid << SID_SHIFT;
struct kvmppc_slb *slb;
u64 gvsid = esid;
ulong mp_ea = vcpu->arch.magic_page_ea;
if (vcpu->arch.shared->msr & (MSR_DR|MSR_IR)) {
slb = kvmppc_mmu_book3s_64_find_slbe(vcpu, ea);
if (slb) {
gvsid = slb->vsid;
if (slb->tb) {
gvsid <<= SID_SHIFT_1T - SID_SHIFT;
gvsid |= esid & ((1ul << (SID_SHIFT_1T - SID_SHIFT)) - 1);
gvsid |= VSID_1T;
}
}
}
switch (vcpu->arch.shared->msr & (MSR_DR|MSR_IR)) {
case 0:
*vsid = VSID_REAL | esid;
break;
case MSR_IR:
*vsid = VSID_REAL_IR | gvsid;
break;
case MSR_DR:
*vsid = VSID_REAL_DR | gvsid;
break;
case MSR_DR|MSR_IR:
if (!slb)
goto no_slb;
*vsid = gvsid;
break;
default:
BUG();
break;
}
if (vcpu->arch.shared->msr & MSR_PR)
*vsid |= VSID_PR;
return 0;
no_slb:
/* Catch magic page case */
if (unlikely(mp_ea) &&
unlikely(esid == (mp_ea >> SID_SHIFT)) &&
!(vcpu->arch.shared->msr & MSR_PR)) {
*vsid = VSID_REAL | esid;
return 0;
}
return -EINVAL;
}
static bool kvmppc_mmu_book3s_64_is_dcbz32(struct kvm_vcpu *vcpu)
{
return (to_book3s(vcpu)->hid[5] & 0x80);
}
void kvmppc_mmu_book3s_64_init(struct kvm_vcpu *vcpu)
{
struct kvmppc_mmu *mmu = &vcpu->arch.mmu;
mmu->mfsrin = NULL;
mmu->mtsrin = kvmppc_mmu_book3s_64_mtsrin;
mmu->slbmte = kvmppc_mmu_book3s_64_slbmte;
mmu->slbmfee = kvmppc_mmu_book3s_64_slbmfee;
mmu->slbmfev = kvmppc_mmu_book3s_64_slbmfev;
mmu->slbie = kvmppc_mmu_book3s_64_slbie;
mmu->slbia = kvmppc_mmu_book3s_64_slbia;
mmu->xlate = kvmppc_mmu_book3s_64_xlate;
mmu->reset_msr = kvmppc_mmu_book3s_64_reset_msr;
mmu->tlbie = kvmppc_mmu_book3s_64_tlbie;
mmu->esid_to_vsid = kvmppc_mmu_book3s_64_esid_to_vsid;
mmu->ea_to_vp = kvmppc_mmu_book3s_64_ea_to_vp;
mmu->is_dcbz32 = kvmppc_mmu_book3s_64_is_dcbz32;
vcpu->arch.hflags |= BOOK3S_HFLAG_SLB;
}
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