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qemu/target/ppc/mmu-hash64.c
BALATON Zoltan cd1038ec1d target/ppc: Add a function to check for page protection bit 
Checking if a page protection bit is set for a given access type is a
common operation. Add a function to avoid repeating the same check at
multiple places. As this relies on access type and page protection bit
values having certain relation also add an assert to ensure that this
assumption holds.

Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
2024-05-24 09:43:13 +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 2.1 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 "qemu/units.h"
#include "cpu.h"
#include "exec/exec-all.h"
#include "exec/page-protection.h"
#include "qemu/error-report.h"
#include "qemu/qemu-print.h"
#include "sysemu/hw_accel.h"
#include "kvm_ppc.h"
#include "mmu-hash64.h"
#include "exec/log.h"
#include "hw/hw.h"
#include "internal.h"
#include "mmu-book3s-v3.h"
#include "helper_regs.h"
#ifdef CONFIG_TCG
#include "exec/helper-proto.h"
#endif
/* #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(PowerPCCPU *cpu)
{
CPUPPCState *env = &cpu->env;
int i;
uint64_t slbe, slbv;
cpu_synchronize_state(CPU(cpu));
qemu_printf("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;
}
qemu_printf("%d\t0x%016" PRIx64 "\t0x%016" PRIx64 "\n",
i, slbe, slbv);
}
}
#ifdef CONFIG_TCG
void helper_SLBIA(CPUPPCState *env, uint32_t ih)
{
PowerPCCPU *cpu = env_archcpu(env);
int starting_entry;
int n;
/*
* slbia must always flush all TLB (which is equivalent to ERAT in ppc
* architecture). Matching on SLB_ESID_V is not good enough, because slbmte
* can overwrite a valid SLB without flushing its lookaside information.
*
* It would be possible to keep the TLB in synch with the SLB by flushing
* when a valid entry is overwritten by slbmte, and therefore slbia would
* not have to flush unless it evicts a valid SLB entry. However it is
* expected that slbmte is more common than slbia, and slbia is usually
* going to evict valid SLB entries, so that tradeoff is unlikely to be a
* good one.
*
* ISA v2.05 introduced IH field with values 0,1,2,6. These all invalidate
* the same SLB entries (everything but entry 0), but differ in what
* "lookaside information" is invalidated. TCG can ignore this and flush
* everything.
*
* ISA v3.0 introduced additional values 3,4,7, which change what SLBs are
* invalidated.
*/
env->tlb_need_flush |= TLB_NEED_LOCAL_FLUSH;
starting_entry = 1; /* default for IH=0,1,2,6 */
if (env->mmu_model == POWERPC_MMU_3_00) {
switch (ih) {
case 0x7:
/* invalidate no SLBs, but all lookaside information */
return;
case 0x3:
case 0x4:
/* also considers SLB entry 0 */
starting_entry = 0;
break;
case 0x5:
/* treat undefined values as ih==0, and warn */
qemu_log_mask(LOG_GUEST_ERROR,
"slbia undefined IH field %u.\n", ih);
break;
default:
/* 0,1,2,6 */
break;
}
}
for (n = starting_entry; n < cpu->hash64_opts->slb_size; n++) {
ppc_slb_t *slb = &env->slb[n];
if (!(slb->esid & SLB_ESID_V)) {
continue;
}
if (env->mmu_model == POWERPC_MMU_3_00) {
if (ih == 0x3 && (slb->vsid & SLB_VSID_C) == 0) {
/* preserves entries with a class value of 0 */
continue;
}
}
slb->esid &= ~SLB_ESID_V;
}
}
#if defined(TARGET_PPC64)
void helper_SLBIAG(CPUPPCState *env, target_ulong rs, uint32_t l)
{
PowerPCCPU *cpu = env_archcpu(env);
int n;
/*
* slbiag must always flush all TLB (which is equivalent to ERAT in ppc
* architecture). Matching on SLB_ESID_V is not good enough, because slbmte
* can overwrite a valid SLB without flushing its lookaside information.
*
* It would be possible to keep the TLB in synch with the SLB by flushing
* when a valid entry is overwritten by slbmte, and therefore slbiag would
* not have to flush unless it evicts a valid SLB entry. However it is
* expected that slbmte is more common than slbiag, and slbiag is usually
* going to evict valid SLB entries, so that tradeoff is unlikely to be a
* good one.
*/
env->tlb_need_flush |= TLB_NEED_LOCAL_FLUSH;
for (n = 0; n < cpu->hash64_opts->slb_size; n++) {
ppc_slb_t *slb = &env->slb[n];
slb->esid &= ~SLB_ESID_V;
}
}
#endif
static void __helper_slbie(CPUPPCState *env, target_ulong addr,
target_ulong global)
{
PowerPCCPU *cpu = env_archcpu(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);
}
#endif
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;
}
#ifdef CONFIG_TCG
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_SLBMTE(CPUPPCState *env, target_ulong rb, target_ulong rs)
{
PowerPCCPU *cpu = env_archcpu(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_SLBMFEE(CPUPPCState *env, target_ulong rb)
{
PowerPCCPU *cpu = env_archcpu(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_SLBFEE(CPUPPCState *env, target_ulong rb)
{
PowerPCCPU *cpu = env_archcpu(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_SLBMFEV(CPUPPCState *env, target_ulong rb)
{
PowerPCCPU *cpu = env_archcpu(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;
}
#endif
/* 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(int mmu_idx,
ppc_slb_t *slb, ppc_hash_pte64_t pte)
{
unsigned pp, key;
/*
* Some pp bit combinations have undefined behaviour, so default
* to no access in those cases
*/
int prot = 0;
key = !!(mmuidx_pr(mmu_idx) ? (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;
hwaddr plen = n * HASH_PTE_SIZE_64;
const ppc_hash_pte64_t *hptes;
if (cpu->vhyp) {
return cpu->vhyp_class->map_hptes(cpu->vhyp, ptex, n);
}
base = ppc_hash64_hpt_base(cpu);
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) {
cpu->vhyp_class->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 void ppc64_v3_new_to_old_hpte(target_ulong *pte0, target_ulong *pte1)
{
/* Insert B into pte0 */
*pte0 = (*pte0 & HPTE64_V_COMMON_BITS) |
((*pte1 & HPTE64_R_3_0_SSIZE_MASK) <<
(HPTE64_V_SSIZE_SHIFT - HPTE64_R_3_0_SSIZE_SHIFT));
/* Remove B from pte1 */
*pte1 = *pte1 & ~HPTE64_R_3_0_SSIZE_MASK;
}
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);
/*
* pte0 contains the valid bit and must be read before pte1,
* otherwise we might see an old pte1 with a new valid bit and
* thus an inconsistent hpte value
*/
smp_rmb();
pte1 = ppc_hash64_hpte1(cpu, pteg, i);
/* Convert format if necessary */
if (cpu->env.mmu_model == POWERPC_MMU_3_00 && !cpu->vhyp) {
ppc64_v3_new_to_old_hpte(&pte0, &pte1);
}
/* 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 " HWADDR_FMT_plx " htab_mask " HWADDR_FMT_plx
" hash " HWADDR_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=" HWADDR_FMT_plx "/" HWADDR_FMT_plx
" vsid=" TARGET_FMT_lx " ptem=" TARGET_FMT_lx
" hash=" HWADDR_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=" HWADDR_FMT_plx "/" HWADDR_FMT_plx
" vsid=" TARGET_FMT_lx " api=" TARGET_FMT_lx
" hash=" HWADDR_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 bool ppc_hash64_use_vrma(CPUPPCState *env)
{
switch (env->mmu_model) {
case POWERPC_MMU_3_00:
/*
* ISAv3.0 (POWER9) always uses VRMA, the VPM0 field and RMOR
* register no longer exist
*/
return true;
default:
return !!(env->spr[SPR_LPCR] & LPCR_VPM0);
}
}
static void ppc_hash64_set_isi(CPUState *cs, int mmu_idx, uint64_t slb_vsid,
uint64_t error_code)
{
CPUPPCState *env = &POWERPC_CPU(cs)->env;
bool vpm;
if (!mmuidx_real(mmu_idx)) {
vpm = !!(env->spr[SPR_LPCR] & LPCR_VPM1);
} else {
vpm = ppc_hash64_use_vrma(env);
}
if (vpm && !mmuidx_hv(mmu_idx)) {
cs->exception_index = POWERPC_EXCP_HISI;
env->spr[SPR_ASDR] = slb_vsid;
} else {
cs->exception_index = POWERPC_EXCP_ISI;
}
env->error_code = error_code;
}
static void ppc_hash64_set_dsi(CPUState *cs, int mmu_idx, uint64_t slb_vsid,
uint64_t dar, uint64_t dsisr)
{
CPUPPCState *env = &POWERPC_CPU(cs)->env;
bool vpm;
if (!mmuidx_real(mmu_idx)) {
vpm = !!(env->spr[SPR_LPCR] & LPCR_VPM1);
} else {
vpm = ppc_hash64_use_vrma(env);
}
if (vpm && !mmuidx_hv(mmu_idx)) {
cs->exception_index = POWERPC_EXCP_HDSI;
env->spr[SPR_HDAR] = dar;
env->spr[SPR_HDSISR] = dsisr;
env->spr[SPR_ASDR] = slb_vsid;
} else {
cs->exception_index = POWERPC_EXCP_DSI;
env->spr[SPR_DAR] = dar;
env->spr[SPR_DSISR] = dsisr;
}
env->error_code = 0;
}
static void ppc_hash64_set_r(PowerPCCPU *cpu, hwaddr ptex, uint64_t pte1)
{
hwaddr base, offset = ptex * HASH_PTE_SIZE_64 + HPTE64_DW1_R;
if (cpu->vhyp) {
cpu->vhyp_class->hpte_set_r(cpu->vhyp, ptex, pte1);
return;
}
base = ppc_hash64_hpt_base(cpu);
/* The HW performs a non-atomic byte update */
stb_phys(CPU(cpu)->as, base + offset, ((pte1 >> 8) & 0xff) | 0x01);
}
static void ppc_hash64_set_c(PowerPCCPU *cpu, hwaddr ptex, uint64_t pte1)
{
hwaddr base, offset = ptex * HASH_PTE_SIZE_64 + HPTE64_DW1_C;
if (cpu->vhyp) {
cpu->vhyp_class->hpte_set_c(cpu->vhyp, ptex, pte1);
return;
}
base = ppc_hash64_hpt_base(cpu);
/* The HW performs a non-atomic byte update */
stb_phys(CPU(cpu)->as, base + offset, (pte1 & 0xff) | 0x80);
}
static target_ulong rmls_limit(PowerPCCPU *cpu)
{
CPUPPCState *env = &cpu->env;
/*
* In theory the meanings of RMLS values are implementation
* dependent. In practice, this seems to have been the set from
* POWER4+..POWER8, and RMLS is no longer supported in POWER9.
*
* Unsupported values mean the OS has shot itself in the
* foot. Return a 0-sized RMA in this case, which we expect
* to trigger an immediate DSI or ISI
*/
static const target_ulong rma_sizes[16] = {
[0] = 256 * GiB,
[1] = 16 * GiB,
[2] = 1 * GiB,
[3] = 64 * MiB,
[4] = 256 * MiB,
[7] = 128 * MiB,
[8] = 32 * MiB,
};
target_ulong rmls = (env->spr[SPR_LPCR] & LPCR_RMLS) >> LPCR_RMLS_SHIFT;
return rma_sizes[rmls];
}
/* Return the LLP in SLB_VSID format */
static uint64_t get_vrma_llp(PowerPCCPU *cpu)
{
CPUPPCState *env = &cpu->env;
uint64_t llp;
if (env->mmu_model == POWERPC_MMU_3_00) {
ppc_v3_pate_t pate;
uint64_t ps, l, lp;
/*
* ISA v3.0 removes the LPCR[VRMASD] field and puts the VRMA base
* page size (L||LP equivalent) in the PS field in the HPT partition
* table entry.
*/
if (!ppc64_v3_get_pate(cpu, cpu->env.spr[SPR_LPIDR], &pate)) {
error_report("Bad VRMA with no partition table entry");
return 0;
}
ps = PATE0_GET_PS(pate.dw0);
/* PS has L||LP in 3 consecutive bits, put them into SLB LLP format */
l = (ps >> 2) & 0x1;
lp = ps & 0x3;
llp = (l << SLB_VSID_L_SHIFT) | (lp << SLB_VSID_LP_SHIFT);
} else {
uint64_t lpcr = env->spr[SPR_LPCR];
target_ulong vrmasd = (lpcr & LPCR_VRMASD) >> LPCR_VRMASD_SHIFT;
/* VRMASD LLP matches SLB format, just shift and mask it */
llp = (vrmasd << SLB_VSID_LP_SHIFT) & SLB_VSID_LLP_MASK;
}
return llp;
}
static int build_vrma_slbe(PowerPCCPU *cpu, ppc_slb_t *slb)
{
uint64_t llp = get_vrma_llp(cpu);
target_ulong vsid = SLB_VSID_VRMA | llp;
int i;
for (i = 0; i < PPC_PAGE_SIZES_MAX_SZ; i++) {
const PPCHash64SegmentPageSizes *sps = &cpu->hash64_opts->sps[i];
if (!sps->page_shift) {
break;
}
if ((vsid & SLB_VSID_LLP_MASK) == sps->slb_enc) {
slb->esid = SLB_ESID_V;
slb->vsid = vsid;
slb->sps = sps;
return 0;
}
}
error_report("Bad VRMA page size encoding 0x" TARGET_FMT_lx, llp);
return -1;
}
bool ppc_hash64_xlate(PowerPCCPU *cpu, vaddr eaddr, MMUAccessType access_type,
hwaddr *raddrp, int *psizep, int *protp, int mmu_idx,
bool guest_visible)
{
CPUState *cs = CPU(cpu);
CPUPPCState *env = &cpu->env;
ppc_slb_t vrma_slbe;
ppc_slb_t *slb;
unsigned apshift;
hwaddr ptex;
ppc_hash_pte64_t pte;
int exec_prot, pp_prot, amr_prot, prot;
int need_prot;
hwaddr raddr;
/*
* Note on LPCR usage: 970 uses HID4, but our special variant of
* store_spr copies relevant fields into env->spr[SPR_LPCR].
* Similarly 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 (mmuidx_real(mmu_idx)) {
/*
* Translation is supposedly "off", but in real mode the top 4
* effective address bits are (mostly) ignored
*/
raddr = eaddr & 0x0FFFFFFFFFFFFFFFULL;
if (cpu->vhyp) {
/*
* In virtual hypervisor mode, there's nothing to do:
* EA == GPA == qemu guest address
*/
} else if (mmuidx_hv(mmu_idx) || !env->has_hv_mode) {
/* In HV mode, add HRMOR if top EA bit is clear */
if (!(eaddr >> 63)) {
raddr |= env->spr[SPR_HRMOR];
}
} else if (ppc_hash64_use_vrma(env)) {
/* Emulated VRMA mode */
slb = &vrma_slbe;
if (build_vrma_slbe(cpu, slb) != 0) {
/* Invalid VRMA setup, machine check */
if (guest_visible) {
cs->exception_index = POWERPC_EXCP_MCHECK;
env->error_code = 0;
}
return false;
}
goto skip_slb_search;
} else {
target_ulong limit = rmls_limit(cpu);
/* Emulated old-style RMO mode, bounds check against RMLS */
if (raddr >= limit) {
if (!guest_visible) {
return false;
}
switch (access_type) {
case MMU_INST_FETCH:
ppc_hash64_set_isi(cs, mmu_idx, 0, SRR1_PROTFAULT);
break;
case MMU_DATA_LOAD:
ppc_hash64_set_dsi(cs, mmu_idx, 0, eaddr, DSISR_PROTFAULT);
break;
case MMU_DATA_STORE:
ppc_hash64_set_dsi(cs, mmu_idx, 0, eaddr,
DSISR_PROTFAULT | DSISR_ISSTORE);
break;
default:
g_assert_not_reached();
}
return false;
}
raddr |= env->spr[SPR_RMOR];
}
*raddrp = raddr;
*protp = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
*psizep = TARGET_PAGE_BITS;
return true;
}
/* 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 (!guest_visible) {
return false;
}
switch (access_type) {
case MMU_INST_FETCH:
cs->exception_index = POWERPC_EXCP_ISEG;
env->error_code = 0;
break;
case MMU_DATA_LOAD:
case MMU_DATA_STORE:
cs->exception_index = POWERPC_EXCP_DSEG;
env->error_code = 0;
env->spr[SPR_DAR] = eaddr;
break;
default:
g_assert_not_reached();
}
return false;
}
skip_slb_search:
/* 3. Check for segment level no-execute violation */
if (access_type == MMU_INST_FETCH && (slb->vsid & SLB_VSID_N)) {
if (guest_visible) {
ppc_hash64_set_isi(cs, mmu_idx, slb->vsid, SRR1_NOEXEC_GUARD);
}
return false;
}
/* 4. Locate the PTE in the hash table */
ptex = ppc_hash64_htab_lookup(cpu, slb, eaddr, &pte, &apshift);
if (ptex == -1) {
if (!guest_visible) {
return false;
}
switch (access_type) {
case MMU_INST_FETCH:
ppc_hash64_set_isi(cs, mmu_idx, slb->vsid, SRR1_NOPTE);
break;
case MMU_DATA_LOAD:
ppc_hash64_set_dsi(cs, mmu_idx, slb->vsid, eaddr, DSISR_NOPTE);
break;
case MMU_DATA_STORE:
ppc_hash64_set_dsi(cs, mmu_idx, slb->vsid, eaddr,
DSISR_NOPTE | DSISR_ISSTORE);
break;
default:
g_assert_not_reached();
}
return false;
}
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(mmu_idx, slb, pte);
amr_prot = ppc_hash64_amr_prot(cpu, pte);
prot = exec_prot & pp_prot & amr_prot;
need_prot = check_prot_access_type(PAGE_RWX, access_type);
if (need_prot & ~prot) {
/* Access right violation */
qemu_log_mask(CPU_LOG_MMU, "PTE access rejected\n");
if (!guest_visible) {
return false;
}
if (access_type == MMU_INST_FETCH) {
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, mmu_idx, slb->vsid, srr1);
} else {
int dsisr = 0;
if (need_prot & ~pp_prot) {
dsisr |= DSISR_PROTFAULT;
}
if (access_type == MMU_DATA_STORE) {
dsisr |= DSISR_ISSTORE;
}
if (need_prot & ~amr_prot) {
dsisr |= DSISR_AMR;
}
ppc_hash64_set_dsi(cs, mmu_idx, slb->vsid, eaddr, dsisr);
}
return false;
}
qemu_log_mask(CPU_LOG_MMU, "PTE access granted !\n");
/* 6. Update PTE referenced and changed bits if necessary */
if (!(pte.pte1 & HPTE64_R_R)) {
ppc_hash64_set_r(cpu, ptex, pte.pte1);
}
if (!(pte.pte1 & HPTE64_R_C)) {
if (access_type == MMU_DATA_STORE) {
ppc_hash64_set_c(cpu, ptex, pte.pte1);
} 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;
}
}
/* 7. Determine the real address from the PTE */
*raddrp = deposit64(pte.pte1 & HPTE64_R_RPN, 0, apshift, eaddr);
*protp = prot;
*psizep = apshift;
return true;
}
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;
}
#ifdef CONFIG_TCG
void helper_store_lpcr(CPUPPCState *env, target_ulong val)
{
PowerPCCPU *cpu = env_archcpu(env);
ppc_store_lpcr(cpu, val);
}
#endif
void ppc_hash64_init(PowerPCCPU *cpu)
{
CPUPPCState *env = &cpu->env;
PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu);
if (!pcc->hash64_opts) {
assert(!mmu_is_64bit(env->mmu_model));
return;
}
cpu->hash64_opts = g_memdup2(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 }, },
},
}
};
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