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qemu/target/ppc/mmu-hash64.c
David Gibson 27f00f0a10 target/ppc: Add ppc_hash64_filter_pagesizes() 
The paravirtualized PAPR platform sometimes needs to restrict the guest to
using only some of the page sizes actually supported by the host's MMU.
At the moment this is handled in KVM specific code, but for consistency we
want to apply the same limitations to all accelerators.

This makes a start on this by providing a helper function in the cpu code
to allow platform code to remove some of the cpu's page size definitions
via a caller supplied callback.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Greg Kurz <groug@kaod.org>
2018-06-22 14:19:07 +10:00

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/*
* PowerPC MMU, TLB, SLB and BAT emulation helpers for QEMU.
*
* Copyright (c) 2003-2007 Jocelyn Mayer
* Copyright (c) 2013 David Gibson, IBM Corporation
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "cpu.h"
#include "exec/exec-all.h"
#include "exec/helper-proto.h"
#include "qemu/error-report.h"
#include "sysemu/hw_accel.h"
#include "kvm_ppc.h"
#include "mmu-hash64.h"
#include "exec/log.h"
#include "hw/hw.h"
#include "mmu-book3s-v3.h"
//#define DEBUG_SLB
#ifdef DEBUG_SLB
# define LOG_SLB(...) qemu_log_mask(CPU_LOG_MMU, __VA_ARGS__)
#else
# define LOG_SLB(...) do { } while (0)
#endif
/*
* SLB handling
*/
static ppc_slb_t *slb_lookup(PowerPCCPU *cpu, target_ulong eaddr)
{
CPUPPCState *env = &cpu->env;
uint64_t esid_256M, esid_1T;
int n;
LOG_SLB("%s: eaddr " TARGET_FMT_lx "\n", __func__, eaddr);
esid_256M = (eaddr & SEGMENT_MASK_256M) | SLB_ESID_V;
esid_1T = (eaddr & SEGMENT_MASK_1T) | SLB_ESID_V;
for (n = 0; n < cpu->hash64_opts->slb_size; n++) {
ppc_slb_t *slb = &env->slb[n];
LOG_SLB("%s: slot %d %016" PRIx64 " %016"
PRIx64 "\n", __func__, n, slb->esid, slb->vsid);
/* We check for 1T matches on all MMUs here - if the MMU
* doesn't have 1T segment support, we will have prevented 1T
* entries from being inserted in the slbmte code. */
if (((slb->esid == esid_256M) &&
((slb->vsid & SLB_VSID_B) == SLB_VSID_B_256M))
|| ((slb->esid == esid_1T) &&
((slb->vsid & SLB_VSID_B) == SLB_VSID_B_1T))) {
return slb;
}
}
return NULL;
}
void dump_slb(FILE *f, fprintf_function cpu_fprintf, PowerPCCPU *cpu)
{
CPUPPCState *env = &cpu->env;
int i;
uint64_t slbe, slbv;
cpu_synchronize_state(CPU(cpu));
cpu_fprintf(f, "SLB\tESID\t\t\tVSID\n");
for (i = 0; i < cpu->hash64_opts->slb_size; i++) {
slbe = env->slb[i].esid;
slbv = env->slb[i].vsid;
if (slbe == 0 && slbv == 0) {
continue;
}
cpu_fprintf(f, "%d\t0x%016" PRIx64 "\t0x%016" PRIx64 "\n",
i, slbe, slbv);
}
}
void helper_slbia(CPUPPCState *env)
{
PowerPCCPU *cpu = ppc_env_get_cpu(env);
int n;
/* XXX: Warning: slbia never invalidates the first segment */
for (n = 1; n < cpu->hash64_opts->slb_size; n++) {
ppc_slb_t *slb = &env->slb[n];
if (slb->esid & SLB_ESID_V) {
slb->esid &= ~SLB_ESID_V;
/* XXX: given the fact that segment size is 256 MB or 1TB,
* and we still don't have a tlb_flush_mask(env, n, mask)
* in QEMU, we just invalidate all TLBs
*/
env->tlb_need_flush |= TLB_NEED_LOCAL_FLUSH;
}
}
}
static void __helper_slbie(CPUPPCState *env, target_ulong addr,
target_ulong global)
{
PowerPCCPU *cpu = ppc_env_get_cpu(env);
ppc_slb_t *slb;
slb = slb_lookup(cpu, addr);
if (!slb) {
return;
}
if (slb->esid & SLB_ESID_V) {
slb->esid &= ~SLB_ESID_V;
/* XXX: given the fact that segment size is 256 MB or 1TB,
* and we still don't have a tlb_flush_mask(env, n, mask)
* in QEMU, we just invalidate all TLBs
*/
env->tlb_need_flush |=
(global == false ? TLB_NEED_LOCAL_FLUSH : TLB_NEED_GLOBAL_FLUSH);
}
}
void helper_slbie(CPUPPCState *env, target_ulong addr)
{
__helper_slbie(env, addr, false);
}
void helper_slbieg(CPUPPCState *env, target_ulong addr)
{
__helper_slbie(env, addr, true);
}
int ppc_store_slb(PowerPCCPU *cpu, target_ulong slot,
target_ulong esid, target_ulong vsid)
{
CPUPPCState *env = &cpu->env;
ppc_slb_t *slb = &env->slb[slot];
const PPCHash64SegmentPageSizes *sps = NULL;
int i;
if (slot >= cpu->hash64_opts->slb_size) {
return -1; /* Bad slot number */
}
if (esid & ~(SLB_ESID_ESID | SLB_ESID_V)) {
return -1; /* Reserved bits set */
}
if (vsid & (SLB_VSID_B & ~SLB_VSID_B_1T)) {
return -1; /* Bad segment size */
}
if ((vsid & SLB_VSID_B) && !(ppc_hash64_has(cpu, PPC_HASH64_1TSEG))) {
return -1; /* 1T segment on MMU that doesn't support it */
}
for (i = 0; i < PPC_PAGE_SIZES_MAX_SZ; i++) {
const PPCHash64SegmentPageSizes *sps1 = &cpu->hash64_opts->sps[i];
if (!sps1->page_shift) {
break;
}
if ((vsid & SLB_VSID_LLP_MASK) == sps1->slb_enc) {
sps = sps1;
break;
}
}
if (!sps) {
error_report("Bad page size encoding in SLB store: slot "TARGET_FMT_lu
" esid 0x"TARGET_FMT_lx" vsid 0x"TARGET_FMT_lx,
slot, esid, vsid);
return -1;
}
slb->esid = esid;
slb->vsid = vsid;
slb->sps = sps;
LOG_SLB("%s: " TARGET_FMT_lu " " TARGET_FMT_lx " - " TARGET_FMT_lx
" => %016" PRIx64 " %016" PRIx64 "\n", __func__, slot, esid, vsid,
slb->esid, slb->vsid);
return 0;
}
static int ppc_load_slb_esid(PowerPCCPU *cpu, target_ulong rb,
target_ulong *rt)
{
CPUPPCState *env = &cpu->env;
int slot = rb & 0xfff;
ppc_slb_t *slb = &env->slb[slot];
if (slot >= cpu->hash64_opts->slb_size) {
return -1;
}
*rt = slb->esid;
return 0;
}
static int ppc_load_slb_vsid(PowerPCCPU *cpu, target_ulong rb,
target_ulong *rt)
{
CPUPPCState *env = &cpu->env;
int slot = rb & 0xfff;
ppc_slb_t *slb = &env->slb[slot];
if (slot >= cpu->hash64_opts->slb_size) {
return -1;
}
*rt = slb->vsid;
return 0;
}
static int ppc_find_slb_vsid(PowerPCCPU *cpu, target_ulong rb,
target_ulong *rt)
{
CPUPPCState *env = &cpu->env;
ppc_slb_t *slb;
if (!msr_is_64bit(env, env->msr)) {
rb &= 0xffffffff;
}
slb = slb_lookup(cpu, rb);
if (slb == NULL) {
*rt = (target_ulong)-1ul;
} else {
*rt = slb->vsid;
}
return 0;
}
void helper_store_slb(CPUPPCState *env, target_ulong rb, target_ulong rs)
{
PowerPCCPU *cpu = ppc_env_get_cpu(env);
if (ppc_store_slb(cpu, rb & 0xfff, rb & ~0xfffULL, rs) < 0) {
raise_exception_err_ra(env, POWERPC_EXCP_PROGRAM,
POWERPC_EXCP_INVAL, GETPC());
}
}
target_ulong helper_load_slb_esid(CPUPPCState *env, target_ulong rb)
{
PowerPCCPU *cpu = ppc_env_get_cpu(env);
target_ulong rt = 0;
if (ppc_load_slb_esid(cpu, rb, &rt) < 0) {
raise_exception_err_ra(env, POWERPC_EXCP_PROGRAM,
POWERPC_EXCP_INVAL, GETPC());
}
return rt;
}
target_ulong helper_find_slb_vsid(CPUPPCState *env, target_ulong rb)
{
PowerPCCPU *cpu = ppc_env_get_cpu(env);
target_ulong rt = 0;
if (ppc_find_slb_vsid(cpu, rb, &rt) < 0) {
raise_exception_err_ra(env, POWERPC_EXCP_PROGRAM,
POWERPC_EXCP_INVAL, GETPC());
}
return rt;
}
target_ulong helper_load_slb_vsid(CPUPPCState *env, target_ulong rb)
{
PowerPCCPU *cpu = ppc_env_get_cpu(env);
target_ulong rt = 0;
if (ppc_load_slb_vsid(cpu, rb, &rt) < 0) {
raise_exception_err_ra(env, POWERPC_EXCP_PROGRAM,
POWERPC_EXCP_INVAL, GETPC());
}
return rt;
}
/* Check No-Execute or Guarded Storage */
static inline int ppc_hash64_pte_noexec_guard(PowerPCCPU *cpu,
ppc_hash_pte64_t pte)
{
/* Exec permissions CANNOT take away read or write permissions */
return (pte.pte1 & HPTE64_R_N) || (pte.pte1 & HPTE64_R_G) ?
PAGE_READ | PAGE_WRITE : PAGE_READ | PAGE_WRITE | PAGE_EXEC;
}
/* Check Basic Storage Protection */
static int ppc_hash64_pte_prot(PowerPCCPU *cpu,
ppc_slb_t *slb, ppc_hash_pte64_t pte)
{
CPUPPCState *env = &cpu->env;
unsigned pp, key;
/* Some pp bit combinations have undefined behaviour, so default
* to no access in those cases */
int prot = 0;
key = !!(msr_pr ? (slb->vsid & SLB_VSID_KP)
: (slb->vsid & SLB_VSID_KS));
pp = (pte.pte1 & HPTE64_R_PP) | ((pte.pte1 & HPTE64_R_PP0) >> 61);
if (key == 0) {
switch (pp) {
case 0x0:
case 0x1:
case 0x2:
prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
break;
case 0x3:
case 0x6:
prot = PAGE_READ | PAGE_EXEC;
break;
}
} else {
switch (pp) {
case 0x0:
case 0x6:
break;
case 0x1:
case 0x3:
prot = PAGE_READ | PAGE_EXEC;
break;
case 0x2:
prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
break;
}
}
return prot;
}
/* Check the instruction access permissions specified in the IAMR */
static int ppc_hash64_iamr_prot(PowerPCCPU *cpu, int key)
{
CPUPPCState *env = &cpu->env;
int iamr_bits = (env->spr[SPR_IAMR] >> 2 * (31 - key)) & 0x3;
/*
* An instruction fetch is permitted if the IAMR bit is 0.
* If the bit is set, return PAGE_READ | PAGE_WRITE because this bit
* can only take away EXEC permissions not READ or WRITE permissions.
* If bit is cleared return PAGE_READ | PAGE_WRITE | PAGE_EXEC since
* EXEC permissions are allowed.
*/
return (iamr_bits & 0x1) ? PAGE_READ | PAGE_WRITE :
PAGE_READ | PAGE_WRITE | PAGE_EXEC;
}
static int ppc_hash64_amr_prot(PowerPCCPU *cpu, ppc_hash_pte64_t pte)
{
CPUPPCState *env = &cpu->env;
int key, amrbits;
int prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
/* Only recent MMUs implement Virtual Page Class Key Protection */
if (!ppc_hash64_has(cpu, PPC_HASH64_AMR)) {
return prot;
}
key = HPTE64_R_KEY(pte.pte1);
amrbits = (env->spr[SPR_AMR] >> 2*(31 - key)) & 0x3;
/* fprintf(stderr, "AMR protection: key=%d AMR=0x%" PRIx64 "\n", key, */
/* env->spr[SPR_AMR]); */
/*
* A store is permitted if the AMR bit is 0. Remove write
* protection if it is set.
*/
if (amrbits & 0x2) {
prot &= ~PAGE_WRITE;
}
/*
* A load is permitted if the AMR bit is 0. Remove read
* protection if it is set.
*/
if (amrbits & 0x1) {
prot &= ~PAGE_READ;
}
switch (env->mmu_model) {
/*
* MMU version 2.07 and later support IAMR
* Check if the IAMR allows the instruction access - it will return
* PAGE_EXEC if it doesn't (and thus that bit will be cleared) or 0
* if it does (and prot will be unchanged indicating execution support).
*/
case POWERPC_MMU_2_07:
case POWERPC_MMU_3_00:
prot &= ppc_hash64_iamr_prot(cpu, key);
break;
default:
break;
}
return prot;
}
const ppc_hash_pte64_t *ppc_hash64_map_hptes(PowerPCCPU *cpu,
hwaddr ptex, int n)
{
hwaddr pte_offset = ptex * HASH_PTE_SIZE_64;
hwaddr base = ppc_hash64_hpt_base(cpu);
hwaddr plen = n * HASH_PTE_SIZE_64;
const ppc_hash_pte64_t *hptes;
if (cpu->vhyp) {
PPCVirtualHypervisorClass *vhc =
PPC_VIRTUAL_HYPERVISOR_GET_CLASS(cpu->vhyp);
return vhc->map_hptes(cpu->vhyp, ptex, n);
}
if (!base) {
return NULL;
}
hptes = address_space_map(CPU(cpu)->as, base + pte_offset, &plen, false,
MEMTXATTRS_UNSPECIFIED);
if (plen < (n * HASH_PTE_SIZE_64)) {
hw_error("%s: Unable to map all requested HPTEs\n", __func__);
}
return hptes;
}
void ppc_hash64_unmap_hptes(PowerPCCPU *cpu, const ppc_hash_pte64_t *hptes,
hwaddr ptex, int n)
{
if (cpu->vhyp) {
PPCVirtualHypervisorClass *vhc =
PPC_VIRTUAL_HYPERVISOR_GET_CLASS(cpu->vhyp);
vhc->unmap_hptes(cpu->vhyp, hptes, ptex, n);
return;
}
address_space_unmap(CPU(cpu)->as, (void *)hptes, n * HASH_PTE_SIZE_64,
false, n * HASH_PTE_SIZE_64);
}
static unsigned hpte_page_shift(const PPCHash64SegmentPageSizes *sps,
uint64_t pte0, uint64_t pte1)
{
int i;
if (!(pte0 & HPTE64_V_LARGE)) {
if (sps->page_shift != 12) {
/* 4kiB page in a non 4kiB segment */
return 0;
}
/* Normal 4kiB page */
return 12;
}
for (i = 0; i < PPC_PAGE_SIZES_MAX_SZ; i++) {
const PPCHash64PageSize *ps = &sps->enc[i];
uint64_t mask;
if (!ps->page_shift) {
break;
}
if (ps->page_shift == 12) {
/* L bit is set so this can't be a 4kiB page */
continue;
}
mask = ((1ULL << ps->page_shift) - 1) & HPTE64_R_RPN;
if ((pte1 & mask) == ((uint64_t)ps->pte_enc << HPTE64_R_RPN_SHIFT)) {
return ps->page_shift;
}
}
return 0; /* Bad page size encoding */
}
static hwaddr ppc_hash64_pteg_search(PowerPCCPU *cpu, hwaddr hash,
const PPCHash64SegmentPageSizes *sps,
target_ulong ptem,
ppc_hash_pte64_t *pte, unsigned *pshift)
{
int i;
const ppc_hash_pte64_t *pteg;
target_ulong pte0, pte1;
target_ulong ptex;
ptex = (hash & ppc_hash64_hpt_mask(cpu)) * HPTES_PER_GROUP;
pteg = ppc_hash64_map_hptes(cpu, ptex, HPTES_PER_GROUP);
if (!pteg) {
return -1;
}
for (i = 0; i < HPTES_PER_GROUP; i++) {
pte0 = ppc_hash64_hpte0(cpu, pteg, i);
pte1 = ppc_hash64_hpte1(cpu, pteg, i);
/* This compares V, B, H (secondary) and the AVPN */
if (HPTE64_V_COMPARE(pte0, ptem)) {
*pshift = hpte_page_shift(sps, pte0, pte1);
/*
* If there is no match, ignore the PTE, it could simply
* be for a different segment size encoding and the
* architecture specifies we should not match. Linux will
* potentially leave behind PTEs for the wrong base page
* size when demoting segments.
*/
if (*pshift == 0) {
continue;
}
/* We don't do anything with pshift yet as qemu TLB only deals
* with 4K pages anyway
*/
pte->pte0 = pte0;
pte->pte1 = pte1;
ppc_hash64_unmap_hptes(cpu, pteg, ptex, HPTES_PER_GROUP);
return ptex + i;
}
}
ppc_hash64_unmap_hptes(cpu, pteg, ptex, HPTES_PER_GROUP);
/*
* We didn't find a valid entry.
*/
return -1;
}
static hwaddr ppc_hash64_htab_lookup(PowerPCCPU *cpu,
ppc_slb_t *slb, target_ulong eaddr,
ppc_hash_pte64_t *pte, unsigned *pshift)
{
CPUPPCState *env = &cpu->env;
hwaddr hash, ptex;
uint64_t vsid, epnmask, epn, ptem;
const PPCHash64SegmentPageSizes *sps = slb->sps;
/* The SLB store path should prevent any bad page size encodings
* getting in there, so: */
assert(sps);
/* If ISL is set in LPCR we need to clamp the page size to 4K */
if (env->spr[SPR_LPCR] & LPCR_ISL) {
/* We assume that when using TCG, 4k is first entry of SPS */
sps = &cpu->hash64_opts->sps[0];
assert(sps->page_shift == 12);
}
epnmask = ~((1ULL << sps->page_shift) - 1);
if (slb->vsid & SLB_VSID_B) {
/* 1TB segment */
vsid = (slb->vsid & SLB_VSID_VSID) >> SLB_VSID_SHIFT_1T;
epn = (eaddr & ~SEGMENT_MASK_1T) & epnmask;
hash = vsid ^ (vsid << 25) ^ (epn >> sps->page_shift);
} else {
/* 256M segment */
vsid = (slb->vsid & SLB_VSID_VSID) >> SLB_VSID_SHIFT;
epn = (eaddr & ~SEGMENT_MASK_256M) & epnmask;
hash = vsid ^ (epn >> sps->page_shift);
}
ptem = (slb->vsid & SLB_VSID_PTEM) | ((epn >> 16) & HPTE64_V_AVPN);
ptem |= HPTE64_V_VALID;
/* Page address translation */
qemu_log_mask(CPU_LOG_MMU,
"htab_base " TARGET_FMT_plx " htab_mask " TARGET_FMT_plx
" hash " TARGET_FMT_plx "\n",
ppc_hash64_hpt_base(cpu), ppc_hash64_hpt_mask(cpu), hash);
/* Primary PTEG lookup */
qemu_log_mask(CPU_LOG_MMU,
"0 htab=" TARGET_FMT_plx "/" TARGET_FMT_plx
" vsid=" TARGET_FMT_lx " ptem=" TARGET_FMT_lx
" hash=" TARGET_FMT_plx "\n",
ppc_hash64_hpt_base(cpu), ppc_hash64_hpt_mask(cpu),
vsid, ptem, hash);
ptex = ppc_hash64_pteg_search(cpu, hash, sps, ptem, pte, pshift);
if (ptex == -1) {
/* Secondary PTEG lookup */
ptem |= HPTE64_V_SECONDARY;
qemu_log_mask(CPU_LOG_MMU,
"1 htab=" TARGET_FMT_plx "/" TARGET_FMT_plx
" vsid=" TARGET_FMT_lx " api=" TARGET_FMT_lx
" hash=" TARGET_FMT_plx "\n", ppc_hash64_hpt_base(cpu),
ppc_hash64_hpt_mask(cpu), vsid, ptem, ~hash);
ptex = ppc_hash64_pteg_search(cpu, ~hash, sps, ptem, pte, pshift);
}
return ptex;
}
unsigned ppc_hash64_hpte_page_shift_noslb(PowerPCCPU *cpu,
uint64_t pte0, uint64_t pte1)
{
int i;
if (!(pte0 & HPTE64_V_LARGE)) {
return 12;
}
/*
* The encodings in env->sps need to be carefully chosen so that
* this gives an unambiguous result.
*/
for (i = 0; i < PPC_PAGE_SIZES_MAX_SZ; i++) {
const PPCHash64SegmentPageSizes *sps = &cpu->hash64_opts->sps[i];
unsigned shift;
if (!sps->page_shift) {
break;
}
shift = hpte_page_shift(sps, pte0, pte1);
if (shift) {
return shift;
}
}
return 0;
}
static void ppc_hash64_set_isi(CPUState *cs, uint64_t error_code)
{
CPUPPCState *env = &POWERPC_CPU(cs)->env;
bool vpm;
if (msr_ir) {
vpm = !!(env->spr[SPR_LPCR] & LPCR_VPM1);
} else {
switch (env->mmu_model) {
case POWERPC_MMU_3_00:
/* Field deprecated in ISAv3.00 - interrupts always go to hyperv */
vpm = true;
break;
default:
vpm = !!(env->spr[SPR_LPCR] & LPCR_VPM0);
break;
}
}
if (vpm && !msr_hv) {
cs->exception_index = POWERPC_EXCP_HISI;
} else {
cs->exception_index = POWERPC_EXCP_ISI;
}
env->error_code = error_code;
}
static void ppc_hash64_set_dsi(CPUState *cs, uint64_t dar, uint64_t dsisr)
{
CPUPPCState *env = &POWERPC_CPU(cs)->env;
bool vpm;
if (msr_dr) {
vpm = !!(env->spr[SPR_LPCR] & LPCR_VPM1);
} else {
switch (env->mmu_model) {
case POWERPC_MMU_3_00:
/* Field deprecated in ISAv3.00 - interrupts always go to hyperv */
vpm = true;
break;
default:
vpm = !!(env->spr[SPR_LPCR] & LPCR_VPM0);
break;
}
}
if (vpm && !msr_hv) {
cs->exception_index = POWERPC_EXCP_HDSI;
env->spr[SPR_HDAR] = dar;
env->spr[SPR_HDSISR] = dsisr;
} else {
cs->exception_index = POWERPC_EXCP_DSI;
env->spr[SPR_DAR] = dar;
env->spr[SPR_DSISR] = dsisr;
}
env->error_code = 0;
}
int ppc_hash64_handle_mmu_fault(PowerPCCPU *cpu, vaddr eaddr,
int rwx, int mmu_idx)
{
CPUState *cs = CPU(cpu);
CPUPPCState *env = &cpu->env;
ppc_slb_t *slb;
unsigned apshift;
hwaddr ptex;
ppc_hash_pte64_t pte;
int exec_prot, pp_prot, amr_prot, prot;
uint64_t new_pte1;
const int need_prot[] = {PAGE_READ, PAGE_WRITE, PAGE_EXEC};
hwaddr raddr;
assert((rwx == 0) || (rwx == 1) || (rwx == 2));
/* Note on LPCR usage: 970 uses HID4, but our special variant
* of store_spr copies relevant fields into env->spr[SPR_LPCR].
* Similarily we filter unimplemented bits when storing into
* LPCR depending on the MMU version. This code can thus just
* use the LPCR "as-is".
*/
/* 1. Handle real mode accesses */
if (((rwx == 2) && (msr_ir == 0)) || ((rwx != 2) && (msr_dr == 0))) {
/* Translation is supposedly "off" */
/* In real mode the top 4 effective address bits are (mostly) ignored */
raddr = eaddr & 0x0FFFFFFFFFFFFFFFULL;
/* In HV mode, add HRMOR if top EA bit is clear */
if (msr_hv || !env->has_hv_mode) {
if (!(eaddr >> 63)) {
raddr |= env->spr[SPR_HRMOR];
}
} else {
/* Otherwise, check VPM for RMA vs VRMA */
if (env->spr[SPR_LPCR] & LPCR_VPM0) {
slb = &env->vrma_slb;
if (slb->sps) {
goto skip_slb_search;
}
/* Not much else to do here */
cs->exception_index = POWERPC_EXCP_MCHECK;
env->error_code = 0;
return 1;
} else if (raddr < env->rmls) {
/* RMA. Check bounds in RMLS */
raddr |= env->spr[SPR_RMOR];
} else {
/* The access failed, generate the approriate interrupt */
if (rwx == 2) {
ppc_hash64_set_isi(cs, SRR1_PROTFAULT);
} else {
int dsisr = DSISR_PROTFAULT;
if (rwx == 1) {
dsisr |= DSISR_ISSTORE;
}
ppc_hash64_set_dsi(cs, eaddr, dsisr);
}
return 1;
}
}
tlb_set_page(cs, eaddr & TARGET_PAGE_MASK, raddr & TARGET_PAGE_MASK,
PAGE_READ | PAGE_WRITE | PAGE_EXEC, mmu_idx,
TARGET_PAGE_SIZE);
return 0;
}
/* 2. Translation is on, so look up the SLB */
slb = slb_lookup(cpu, eaddr);
if (!slb) {
/* No entry found, check if in-memory segment tables are in use */
if (ppc64_use_proc_tbl(cpu)) {
/* TODO - Unsupported */
error_report("Segment Table Support Unimplemented");
exit(1);
}
/* Segment still not found, generate the appropriate interrupt */
if (rwx == 2) {
cs->exception_index = POWERPC_EXCP_ISEG;
env->error_code = 0;
} else {
cs->exception_index = POWERPC_EXCP_DSEG;
env->error_code = 0;
env->spr[SPR_DAR] = eaddr;
}
return 1;
}
skip_slb_search:
/* 3. Check for segment level no-execute violation */
if ((rwx == 2) && (slb->vsid & SLB_VSID_N)) {
ppc_hash64_set_isi(cs, SRR1_NOEXEC_GUARD);
return 1;
}
/* 4. Locate the PTE in the hash table */
ptex = ppc_hash64_htab_lookup(cpu, slb, eaddr, &pte, &apshift);
if (ptex == -1) {
if (rwx == 2) {
ppc_hash64_set_isi(cs, SRR1_NOPTE);
} else {
int dsisr = DSISR_NOPTE;
if (rwx == 1) {
dsisr |= DSISR_ISSTORE;
}
ppc_hash64_set_dsi(cs, eaddr, dsisr);
}
return 1;
}
qemu_log_mask(CPU_LOG_MMU,
"found PTE at index %08" HWADDR_PRIx "\n", ptex);
/* 5. Check access permissions */
exec_prot = ppc_hash64_pte_noexec_guard(cpu, pte);
pp_prot = ppc_hash64_pte_prot(cpu, slb, pte);
amr_prot = ppc_hash64_amr_prot(cpu, pte);
prot = exec_prot & pp_prot & amr_prot;
if ((need_prot[rwx] & ~prot) != 0) {
/* Access right violation */
qemu_log_mask(CPU_LOG_MMU, "PTE access rejected\n");
if (rwx == 2) {
int srr1 = 0;
if (PAGE_EXEC & ~exec_prot) {
srr1 |= SRR1_NOEXEC_GUARD; /* Access violates noexec or guard */
} else if (PAGE_EXEC & ~pp_prot) {
srr1 |= SRR1_PROTFAULT; /* Access violates access authority */
}
if (PAGE_EXEC & ~amr_prot) {
srr1 |= SRR1_IAMR; /* Access violates virt pg class key prot */
}
ppc_hash64_set_isi(cs, srr1);
} else {
int dsisr = 0;
if (need_prot[rwx] & ~pp_prot) {
dsisr |= DSISR_PROTFAULT;
}
if (rwx == 1) {
dsisr |= DSISR_ISSTORE;
}
if (need_prot[rwx] & ~amr_prot) {
dsisr |= DSISR_AMR;
}
ppc_hash64_set_dsi(cs, eaddr, dsisr);
}
return 1;
}
qemu_log_mask(CPU_LOG_MMU, "PTE access granted !\n");
/* 6. Update PTE referenced and changed bits if necessary */
new_pte1 = pte.pte1 | HPTE64_R_R; /* set referenced bit */
if (rwx == 1) {
new_pte1 |= HPTE64_R_C; /* set changed (dirty) bit */
} else {
/* Treat the page as read-only for now, so that a later write
* will pass through this function again to set the C bit */
prot &= ~PAGE_WRITE;
}
if (new_pte1 != pte.pte1) {
ppc_hash64_store_hpte(cpu, ptex, pte.pte0, new_pte1);
}
/* 7. Determine the real address from the PTE */
raddr = deposit64(pte.pte1 & HPTE64_R_RPN, 0, apshift, eaddr);
tlb_set_page(cs, eaddr & TARGET_PAGE_MASK, raddr & TARGET_PAGE_MASK,
prot, mmu_idx, 1ULL << apshift);
return 0;
}
hwaddr ppc_hash64_get_phys_page_debug(PowerPCCPU *cpu, target_ulong addr)
{
CPUPPCState *env = &cpu->env;
ppc_slb_t *slb;
hwaddr ptex, raddr;
ppc_hash_pte64_t pte;
unsigned apshift;
/* Handle real mode */
if (msr_dr == 0) {
/* In real mode the top 4 effective address bits are ignored */
raddr = addr & 0x0FFFFFFFFFFFFFFFULL;
/* In HV mode, add HRMOR if top EA bit is clear */
if ((msr_hv || !env->has_hv_mode) && !(addr >> 63)) {
return raddr | env->spr[SPR_HRMOR];
}
/* Otherwise, check VPM for RMA vs VRMA */
if (env->spr[SPR_LPCR] & LPCR_VPM0) {
slb = &env->vrma_slb;
if (!slb->sps) {
return -1;
}
} else if (raddr < env->rmls) {
/* RMA. Check bounds in RMLS */
return raddr | env->spr[SPR_RMOR];
} else {
return -1;
}
} else {
slb = slb_lookup(cpu, addr);
if (!slb) {
return -1;
}
}
ptex = ppc_hash64_htab_lookup(cpu, slb, addr, &pte, &apshift);
if (ptex == -1) {
return -1;
}
return deposit64(pte.pte1 & HPTE64_R_RPN, 0, apshift, addr)
& TARGET_PAGE_MASK;
}
void ppc_hash64_store_hpte(PowerPCCPU *cpu, hwaddr ptex,
uint64_t pte0, uint64_t pte1)
{
hwaddr base = ppc_hash64_hpt_base(cpu);
hwaddr offset = ptex * HASH_PTE_SIZE_64;
if (cpu->vhyp) {
PPCVirtualHypervisorClass *vhc =
PPC_VIRTUAL_HYPERVISOR_GET_CLASS(cpu->vhyp);
vhc->store_hpte(cpu->vhyp, ptex, pte0, pte1);
return;
}
stq_phys(CPU(cpu)->as, base + offset, pte0);
stq_phys(CPU(cpu)->as, base + offset + HASH_PTE_SIZE_64 / 2, pte1);
}
void ppc_hash64_tlb_flush_hpte(PowerPCCPU *cpu, target_ulong ptex,
target_ulong pte0, target_ulong pte1)
{
/*
* XXX: given the fact that there are too many segments to
* invalidate, and we still don't have a tlb_flush_mask(env, n,
* mask) in QEMU, we just invalidate all TLBs
*/
cpu->env.tlb_need_flush = TLB_NEED_GLOBAL_FLUSH | TLB_NEED_LOCAL_FLUSH;
}
static void ppc_hash64_update_rmls(PowerPCCPU *cpu)
{
CPUPPCState *env = &cpu->env;
uint64_t lpcr = env->spr[SPR_LPCR];
/*
* This is the full 4 bits encoding of POWER8. Previous
* CPUs only support a subset of these but the filtering
* is done when writing LPCR
*/
switch ((lpcr & LPCR_RMLS) >> LPCR_RMLS_SHIFT) {
case 0x8: /* 32MB */
env->rmls = 0x2000000ull;
break;
case 0x3: /* 64MB */
env->rmls = 0x4000000ull;
break;
case 0x7: /* 128MB */
env->rmls = 0x8000000ull;
break;
case 0x4: /* 256MB */
env->rmls = 0x10000000ull;
break;
case 0x2: /* 1GB */
env->rmls = 0x40000000ull;
break;
case 0x1: /* 16GB */
env->rmls = 0x400000000ull;
break;
default:
/* What to do here ??? */
env->rmls = 0;
}
}
static void ppc_hash64_update_vrma(PowerPCCPU *cpu)
{
CPUPPCState *env = &cpu->env;
const PPCHash64SegmentPageSizes *sps = NULL;
target_ulong esid, vsid, lpcr;
ppc_slb_t *slb = &env->vrma_slb;
uint32_t vrmasd;
int i;
/* First clear it */
slb->esid = slb->vsid = 0;
slb->sps = NULL;
/* Is VRMA enabled ? */
lpcr = env->spr[SPR_LPCR];
if (!(lpcr & LPCR_VPM0)) {
return;
}
/* Make one up. Mostly ignore the ESID which will not be
* needed for translation
*/
vsid = SLB_VSID_VRMA;
vrmasd = (lpcr & LPCR_VRMASD) >> LPCR_VRMASD_SHIFT;
vsid |= (vrmasd << 4) & (SLB_VSID_L | SLB_VSID_LP);
esid = SLB_ESID_V;
for (i = 0; i < PPC_PAGE_SIZES_MAX_SZ; i++) {
const PPCHash64SegmentPageSizes *sps1 = &cpu->hash64_opts->sps[i];
if (!sps1->page_shift) {
break;
}
if ((vsid & SLB_VSID_LLP_MASK) == sps1->slb_enc) {
sps = sps1;
break;
}
}
if (!sps) {
error_report("Bad page size encoding esid 0x"TARGET_FMT_lx
" vsid 0x"TARGET_FMT_lx, esid, vsid);
return;
}
slb->vsid = vsid;
slb->esid = esid;
slb->sps = sps;
}
void ppc_store_lpcr(PowerPCCPU *cpu, target_ulong val)
{
CPUPPCState *env = &cpu->env;
uint64_t lpcr = 0;
/* Filter out bits */
switch (env->mmu_model) {
case POWERPC_MMU_64B: /* 970 */
if (val & 0x40) {
lpcr |= LPCR_LPES0;
}
if (val & 0x8000000000000000ull) {
lpcr |= LPCR_LPES1;
}
if (val & 0x20) {
lpcr |= (0x4ull << LPCR_RMLS_SHIFT);
}
if (val & 0x4000000000000000ull) {
lpcr |= (0x2ull << LPCR_RMLS_SHIFT);
}
if (val & 0x2000000000000000ull) {
lpcr |= (0x1ull << LPCR_RMLS_SHIFT);
}
env->spr[SPR_RMOR] = ((lpcr >> 41) & 0xffffull) << 26;
/* XXX We could also write LPID from HID4 here
* but since we don't tag any translation on it
* it doesn't actually matter
*/
/* XXX For proper emulation of 970 we also need
* to dig HRMOR out of HID5
*/
break;
case POWERPC_MMU_2_03: /* P5p */
lpcr = val & (LPCR_RMLS | LPCR_ILE |
LPCR_LPES0 | LPCR_LPES1 |
LPCR_RMI | LPCR_HDICE);
break;
case POWERPC_MMU_2_06: /* P7 */
lpcr = val & (LPCR_VPM0 | LPCR_VPM1 | LPCR_ISL | LPCR_DPFD |
LPCR_VRMASD | LPCR_RMLS | LPCR_ILE |
LPCR_P7_PECE0 | LPCR_P7_PECE1 | LPCR_P7_PECE2 |
LPCR_MER | LPCR_TC |
LPCR_LPES0 | LPCR_LPES1 | LPCR_HDICE);
break;
case POWERPC_MMU_2_07: /* P8 */
lpcr = val & (LPCR_VPM0 | LPCR_VPM1 | LPCR_ISL | LPCR_KBV |
LPCR_DPFD | LPCR_VRMASD | LPCR_RMLS | LPCR_ILE |
LPCR_AIL | LPCR_ONL | LPCR_P8_PECE0 | LPCR_P8_PECE1 |
LPCR_P8_PECE2 | LPCR_P8_PECE3 | LPCR_P8_PECE4 |
LPCR_MER | LPCR_TC | LPCR_LPES0 | LPCR_HDICE);
break;
case POWERPC_MMU_3_00: /* P9 */
lpcr = val & (LPCR_VPM1 | LPCR_ISL | LPCR_KBV | LPCR_DPFD |
(LPCR_PECE_U_MASK & LPCR_HVEE) | LPCR_ILE | LPCR_AIL |
LPCR_UPRT | LPCR_EVIRT | LPCR_ONL |
(LPCR_PECE_L_MASK & (LPCR_PDEE | LPCR_HDEE | LPCR_EEE |
LPCR_DEE | LPCR_OEE)) | LPCR_MER | LPCR_GTSE | LPCR_TC |
LPCR_HEIC | LPCR_LPES0 | LPCR_HVICE | LPCR_HDICE);
break;
default:
;
}
env->spr[SPR_LPCR] = lpcr;
ppc_hash64_update_rmls(cpu);
ppc_hash64_update_vrma(cpu);
}
void helper_store_lpcr(CPUPPCState *env, target_ulong val)
{
PowerPCCPU *cpu = ppc_env_get_cpu(env);
ppc_store_lpcr(cpu, val);
}
void ppc_hash64_init(PowerPCCPU *cpu)
{
CPUPPCState *env = &cpu->env;
PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu);
if (!pcc->hash64_opts) {
assert(!(env->mmu_model & POWERPC_MMU_64));
return;
}
cpu->hash64_opts = g_memdup(pcc->hash64_opts, sizeof(*cpu->hash64_opts));
}
void ppc_hash64_finalize(PowerPCCPU *cpu)
{
g_free(cpu->hash64_opts);
}
const PPCHash64Options ppc_hash64_opts_basic = {
.flags = 0,
.slb_size = 64,
.sps = {
{ .page_shift = 12, /* 4K */
.slb_enc = 0,
.enc = { { .page_shift = 12, .pte_enc = 0 } }
},
{ .page_shift = 24, /* 16M */
.slb_enc = 0x100,
.enc = { { .page_shift = 24, .pte_enc = 0 } }
},
},
};
const PPCHash64Options ppc_hash64_opts_POWER7 = {
.flags = PPC_HASH64_1TSEG | PPC_HASH64_AMR | PPC_HASH64_CI_LARGEPAGE,
.slb_size = 32,
.sps = {
{
.page_shift = 12, /* 4K */
.slb_enc = 0,
.enc = { { .page_shift = 12, .pte_enc = 0 },
{ .page_shift = 16, .pte_enc = 0x7 },
{ .page_shift = 24, .pte_enc = 0x38 }, },
},
{
.page_shift = 16, /* 64K */
.slb_enc = SLB_VSID_64K,
.enc = { { .page_shift = 16, .pte_enc = 0x1 },
{ .page_shift = 24, .pte_enc = 0x8 }, },
},
{
.page_shift = 24, /* 16M */
.slb_enc = SLB_VSID_16M,
.enc = { { .page_shift = 24, .pte_enc = 0 }, },
},
{
.page_shift = 34, /* 16G */
.slb_enc = SLB_VSID_16G,
.enc = { { .page_shift = 34, .pte_enc = 0x3 }, },
},
}
};
void ppc_hash64_filter_pagesizes(PowerPCCPU *cpu,
bool (*cb)(void *, uint32_t, uint32_t),
void *opaque)
{
PPCHash64Options *opts = cpu->hash64_opts;
int i;
int n = 0;
bool ci_largepage = false;
assert(opts);
n = 0;
for (i = 0; i < ARRAY_SIZE(opts->sps); i++) {
PPCHash64SegmentPageSizes *sps = &opts->sps[i];
int j;
int m = 0;
assert(n <= i);
if (!sps->page_shift) {
break;
}
for (j = 0; j < ARRAY_SIZE(sps->enc); j++) {
PPCHash64PageSize *ps = &sps->enc[j];
assert(m <= j);
if (!ps->page_shift) {
break;
}
if (cb(opaque, sps->page_shift, ps->page_shift)) {
if (ps->page_shift >= 16) {
ci_largepage = true;
}
sps->enc[m++] = *ps;
}
}
/* Clear rest of the row */
for (j = m; j < ARRAY_SIZE(sps->enc); j++) {
memset(&sps->enc[j], 0, sizeof(sps->enc[j]));
}
if (m) {
n++;
}
}
/* Clear the rest of the table */
for (i = n; i < ARRAY_SIZE(opts->sps); i++) {
memset(&opts->sps[i], 0, sizeof(opts->sps[i]));
}
if (!ci_largepage) {
opts->flags &= ~PPC_HASH64_CI_LARGEPAGE;
}
}
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