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qemu/target/ppc/mmu-hash64.c
Nicholas Piggin c700b5e162 spapr: avoid overhead of finding vhyp class in critical operations 
PPC_VIRTUAL_HYPERVISOR_GET_CLASS is used in critical operations like
interrupts and TLB misses and is quite costly. Running the
kvm-unit-tests sieve program with radix MMU enabled thrashes the TCG
TLB and spends a lot of time in TLB and page table walking code. The
test takes 67 seconds to complete with a lot of time being spent in
code related to finding the vhyp class:

   12.01%  [.] g_str_hash
    8.94%  [.] g_hash_table_lookup
    8.06%  [.] object_class_dynamic_cast
    6.21%  [.] address_space_ldq
    4.94%  [.] __strcmp_avx2
    4.28%  [.] tlb_set_page_full
    4.08%  [.] address_space_translate_internal
    3.17%  [.] object_class_dynamic_cast_assert
    2.84%  [.] ppc_radix64_xlate

Keep a pointer to the class and avoid this lookup. This reduces the
execution time to 40 seconds.

Reviewed-by: Harsh Prateek Bora <harshpb@linux.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
2024-05-24 08:57:50 +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 = prot_for_access_type(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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