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qemu-e2k/target/ppc/mmu-radix64.c
Leandro Lupori c6242335b3 target/ppc: fix ISI fault cause for Radix MMU 
Fix Instruction Storage Interrupt (ISI) fault cause for Radix MMU,
when caused by missing PAGE_EXEC permission, to be
SRR1_NOEXEC_GUARD instead of DSISR_PROTFAULT.
This matches POWER9 hardware behavior.

Fixes: d5fee0bbe6 ("target/ppc: Implement ISA V3.00 radix page fault handler")
Signed-off-by: Leandro Lupori <leandro.lupori@eldorado.org.br>
Message-Id: <20220309192756.145283-1-leandro.lupori@eldorado.org.br>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
2022-03-14 15:57:17 +01:00

668 lines
22 KiB
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/*
* PowerPC Radix MMU mulation helpers for QEMU.
*
* Copyright (c) 2016 Suraj Jitindar Singh, 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 "cpu.h"
#include "exec/exec-all.h"
#include "qemu/error-report.h"
#include "sysemu/kvm.h"
#include "kvm_ppc.h"
#include "exec/log.h"
#include "internal.h"
#include "mmu-radix64.h"
#include "mmu-book3s-v3.h"
static bool ppc_radix64_get_fully_qualified_addr(const CPUPPCState *env,
vaddr eaddr,
uint64_t *lpid, uint64_t *pid)
{
/* When EA(2:11) are nonzero, raise a segment interrupt */
if (eaddr & ~R_EADDR_VALID_MASK) {
return false;
}
if (msr_hv) { /* MSR[HV] -> Hypervisor/bare metal */
switch (eaddr & R_EADDR_QUADRANT) {
case R_EADDR_QUADRANT0:
*lpid = 0;
*pid = env->spr[SPR_BOOKS_PID];
break;
case R_EADDR_QUADRANT1:
*lpid = env->spr[SPR_LPIDR];
*pid = env->spr[SPR_BOOKS_PID];
break;
case R_EADDR_QUADRANT2:
*lpid = env->spr[SPR_LPIDR];
*pid = 0;
break;
case R_EADDR_QUADRANT3:
*lpid = 0;
*pid = 0;
break;
default:
g_assert_not_reached();
}
} else { /* !MSR[HV] -> Guest */
switch (eaddr & R_EADDR_QUADRANT) {
case R_EADDR_QUADRANT0: /* Guest application */
*lpid = env->spr[SPR_LPIDR];
*pid = env->spr[SPR_BOOKS_PID];
break;
case R_EADDR_QUADRANT1: /* Illegal */
case R_EADDR_QUADRANT2:
return false;
case R_EADDR_QUADRANT3: /* Guest OS */
*lpid = env->spr[SPR_LPIDR];
*pid = 0; /* pid set to 0 -> addresses guest operating system */
break;
default:
g_assert_not_reached();
}
}
return true;
}
static void ppc_radix64_raise_segi(PowerPCCPU *cpu, MMUAccessType access_type,
vaddr eaddr)
{
CPUState *cs = CPU(cpu);
CPUPPCState *env = &cpu->env;
switch (access_type) {
case MMU_INST_FETCH:
/* Instruction Segment Interrupt */
cs->exception_index = POWERPC_EXCP_ISEG;
break;
case MMU_DATA_STORE:
case MMU_DATA_LOAD:
/* Data Segment Interrupt */
cs->exception_index = POWERPC_EXCP_DSEG;
env->spr[SPR_DAR] = eaddr;
break;
default:
g_assert_not_reached();
}
env->error_code = 0;
}
static inline const char *access_str(MMUAccessType access_type)
{
return access_type == MMU_DATA_LOAD ? "reading" :
(access_type == MMU_DATA_STORE ? "writing" : "execute");
}
static void ppc_radix64_raise_si(PowerPCCPU *cpu, MMUAccessType access_type,
vaddr eaddr, uint32_t cause)
{
CPUState *cs = CPU(cpu);
CPUPPCState *env = &cpu->env;
qemu_log_mask(CPU_LOG_MMU, "%s for %s @0x%"VADDR_PRIx" cause %08x\n",
__func__, access_str(access_type),
eaddr, cause);
switch (access_type) {
case MMU_INST_FETCH:
/* Instruction Storage Interrupt */
cs->exception_index = POWERPC_EXCP_ISI;
env->error_code = cause;
break;
case MMU_DATA_STORE:
cause |= DSISR_ISSTORE;
/* fall through */
case MMU_DATA_LOAD:
/* Data Storage Interrupt */
cs->exception_index = POWERPC_EXCP_DSI;
env->spr[SPR_DSISR] = cause;
env->spr[SPR_DAR] = eaddr;
env->error_code = 0;
break;
default:
g_assert_not_reached();
}
}
static void ppc_radix64_raise_hsi(PowerPCCPU *cpu, MMUAccessType access_type,
vaddr eaddr, hwaddr g_raddr, uint32_t cause)
{
CPUState *cs = CPU(cpu);
CPUPPCState *env = &cpu->env;
qemu_log_mask(CPU_LOG_MMU, "%s for %s @0x%"VADDR_PRIx" 0x%"
HWADDR_PRIx" cause %08x\n",
__func__, access_str(access_type),
eaddr, g_raddr, cause);
switch (access_type) {
case MMU_INST_FETCH:
/* H Instruction Storage Interrupt */
cs->exception_index = POWERPC_EXCP_HISI;
env->spr[SPR_ASDR] = g_raddr;
env->error_code = cause;
break;
case MMU_DATA_STORE:
cause |= DSISR_ISSTORE;
/* fall through */
case MMU_DATA_LOAD:
/* H Data Storage Interrupt */
cs->exception_index = POWERPC_EXCP_HDSI;
env->spr[SPR_HDSISR] = cause;
env->spr[SPR_HDAR] = eaddr;
env->spr[SPR_ASDR] = g_raddr;
env->error_code = 0;
break;
default:
g_assert_not_reached();
}
}
static bool ppc_radix64_check_prot(PowerPCCPU *cpu, MMUAccessType access_type,
uint64_t pte, int *fault_cause, int *prot,
int mmu_idx, bool partition_scoped)
{
CPUPPCState *env = &cpu->env;
int need_prot;
/* Check Page Attributes (pte58:59) */
if ((pte & R_PTE_ATT) == R_PTE_ATT_NI_IO && access_type == MMU_INST_FETCH) {
/*
* Radix PTE entries with the non-idempotent I/O attribute are treated
* as guarded storage
*/
*fault_cause |= SRR1_NOEXEC_GUARD;
return true;
}
/* Determine permissions allowed by Encoded Access Authority */
if (!partition_scoped && (pte & R_PTE_EAA_PRIV) && msr_pr) {
*prot = 0;
} else if (mmuidx_pr(mmu_idx) || (pte & R_PTE_EAA_PRIV) ||
partition_scoped) {
*prot = ppc_radix64_get_prot_eaa(pte);
} else { /* !msr_pr && !(pte & R_PTE_EAA_PRIV) && !partition_scoped */
*prot = ppc_radix64_get_prot_eaa(pte);
*prot &= ppc_radix64_get_prot_amr(cpu); /* Least combined permissions */
}
/* Check if requested access type is allowed */
need_prot = prot_for_access_type(access_type);
if (need_prot & ~*prot) { /* Page Protected for that Access */
*fault_cause |= access_type == MMU_INST_FETCH ? SRR1_NOEXEC_GUARD :
DSISR_PROTFAULT;
return true;
}
return false;
}
static void ppc_radix64_set_rc(PowerPCCPU *cpu, MMUAccessType access_type,
uint64_t pte, hwaddr pte_addr, int *prot)
{
CPUState *cs = CPU(cpu);
uint64_t npte;
npte = pte | R_PTE_R; /* Always set reference bit */
if (access_type == MMU_DATA_STORE) { /* Store/Write */
npte |= R_PTE_C; /* Set change 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 (pte ^ npte) { /* If pte has changed then write it back */
stq_phys(cs->as, pte_addr, npte);
}
}
static int ppc_radix64_next_level(AddressSpace *as, vaddr eaddr,
uint64_t *pte_addr, uint64_t *nls,
int *psize, uint64_t *pte, int *fault_cause)
{
uint64_t index, pde;
if (*nls < 5) { /* Directory maps less than 2**5 entries */
*fault_cause |= DSISR_R_BADCONFIG;
return 1;
}
/* Read page <directory/table> entry from guest address space */
pde = ldq_phys(as, *pte_addr);
if (!(pde & R_PTE_VALID)) { /* Invalid Entry */
*fault_cause |= DSISR_NOPTE;
return 1;
}
*pte = pde;
*psize -= *nls;
if (!(pde & R_PTE_LEAF)) { /* Prepare for next iteration */
*nls = pde & R_PDE_NLS;
index = eaddr >> (*psize - *nls); /* Shift */
index &= ((1UL << *nls) - 1); /* Mask */
*pte_addr = (pde & R_PDE_NLB) + (index * sizeof(pde));
}
return 0;
}
static int ppc_radix64_walk_tree(AddressSpace *as, vaddr eaddr,
uint64_t base_addr, uint64_t nls,
hwaddr *raddr, int *psize, uint64_t *pte,
int *fault_cause, hwaddr *pte_addr)
{
uint64_t index, pde, rpn , mask;
if (nls < 5) { /* Directory maps less than 2**5 entries */
*fault_cause |= DSISR_R_BADCONFIG;
return 1;
}
index = eaddr >> (*psize - nls); /* Shift */
index &= ((1UL << nls) - 1); /* Mask */
*pte_addr = base_addr + (index * sizeof(pde));
do {
int ret;
ret = ppc_radix64_next_level(as, eaddr, pte_addr, &nls, psize, &pde,
fault_cause);
if (ret) {
return ret;
}
} while (!(pde & R_PTE_LEAF));
*pte = pde;
rpn = pde & R_PTE_RPN;
mask = (1UL << *psize) - 1;
/* Or high bits of rpn and low bits to ea to form whole real addr */
*raddr = (rpn & ~mask) | (eaddr & mask);
return 0;
}
static bool validate_pate(PowerPCCPU *cpu, uint64_t lpid, ppc_v3_pate_t *pate)
{
CPUPPCState *env = &cpu->env;
if (!(pate->dw0 & PATE0_HR)) {
return false;
}
if (lpid == 0 && !msr_hv) {
return false;
}
if ((pate->dw0 & PATE1_R_PRTS) < 5) {
return false;
}
/* More checks ... */
return true;
}
static int ppc_radix64_partition_scoped_xlate(PowerPCCPU *cpu,
MMUAccessType access_type,
vaddr eaddr, hwaddr g_raddr,
ppc_v3_pate_t pate,
hwaddr *h_raddr, int *h_prot,
int *h_page_size, bool pde_addr,
int mmu_idx, bool guest_visible)
{
int fault_cause = 0;
hwaddr pte_addr;
uint64_t pte;
qemu_log_mask(CPU_LOG_MMU, "%s for %s @0x%"VADDR_PRIx
" mmu_idx %u 0x%"HWADDR_PRIx"\n",
__func__, access_str(access_type),
eaddr, mmu_idx, g_raddr);
*h_page_size = PRTBE_R_GET_RTS(pate.dw0);
/* No valid pte or access denied due to protection */
if (ppc_radix64_walk_tree(CPU(cpu)->as, g_raddr, pate.dw0 & PRTBE_R_RPDB,
pate.dw0 & PRTBE_R_RPDS, h_raddr, h_page_size,
&pte, &fault_cause, &pte_addr) ||
ppc_radix64_check_prot(cpu, access_type, pte,
&fault_cause, h_prot, mmu_idx, true)) {
if (pde_addr) { /* address being translated was that of a guest pde */
fault_cause |= DSISR_PRTABLE_FAULT;
}
if (guest_visible) {
ppc_radix64_raise_hsi(cpu, access_type, eaddr, g_raddr, fault_cause);
}
return 1;
}
if (guest_visible) {
ppc_radix64_set_rc(cpu, access_type, pte, pte_addr, h_prot);
}
return 0;
}
/*
* The spapr vhc has a flat partition scope provided by qemu memory when
* not nested.
*
* When running a nested guest, the addressing is 2-level radix on top of the
* vhc memory, so it works practically identically to the bare metal 2-level
* radix. So that code is selected directly. A cleaner and more flexible nested
* hypervisor implementation would allow the vhc to provide a ->nested_xlate()
* function but that is not required for the moment.
*/
static bool vhyp_flat_addressing(PowerPCCPU *cpu)
{
if (cpu->vhyp) {
return !vhyp_cpu_in_nested(cpu);
}
return false;
}
static int ppc_radix64_process_scoped_xlate(PowerPCCPU *cpu,
MMUAccessType access_type,
vaddr eaddr, uint64_t pid,
ppc_v3_pate_t pate, hwaddr *g_raddr,
int *g_prot, int *g_page_size,
int mmu_idx, bool guest_visible)
{
CPUState *cs = CPU(cpu);
CPUPPCState *env = &cpu->env;
uint64_t offset, size, prtbe_addr, prtbe0, base_addr, nls, index, pte;
int fault_cause = 0, h_page_size, h_prot;
hwaddr h_raddr, pte_addr;
int ret;
qemu_log_mask(CPU_LOG_MMU, "%s for %s @0x%"VADDR_PRIx
" mmu_idx %u pid %"PRIu64"\n",
__func__, access_str(access_type),
eaddr, mmu_idx, pid);
/* Index Process Table by PID to Find Corresponding Process Table Entry */
offset = pid * sizeof(struct prtb_entry);
size = 1ULL << ((pate.dw1 & PATE1_R_PRTS) + 12);
if (offset >= size) {
/* offset exceeds size of the process table */
if (guest_visible) {
ppc_radix64_raise_si(cpu, access_type, eaddr, DSISR_NOPTE);
}
return 1;
}
prtbe_addr = (pate.dw1 & PATE1_R_PRTB) + offset;
if (vhyp_flat_addressing(cpu)) {
prtbe0 = ldq_phys(cs->as, prtbe_addr);
} else {
/*
* Process table addresses are subject to partition-scoped
* translation
*
* On a Radix host, the partition-scoped page table for LPID=0
* is only used to translate the effective addresses of the
* process table entries.
*/
ret = ppc_radix64_partition_scoped_xlate(cpu, 0, eaddr, prtbe_addr,
pate, &h_raddr, &h_prot,
&h_page_size, true,
/* mmu_idx is 5 because we're translating from hypervisor scope */
5, guest_visible);
if (ret) {
return ret;
}
prtbe0 = ldq_phys(cs->as, h_raddr);
}
/* Walk Radix Tree from Process Table Entry to Convert EA to RA */
*g_page_size = PRTBE_R_GET_RTS(prtbe0);
base_addr = prtbe0 & PRTBE_R_RPDB;
nls = prtbe0 & PRTBE_R_RPDS;
if (msr_hv || vhyp_flat_addressing(cpu)) {
/*
* Can treat process table addresses as real addresses
*/
ret = ppc_radix64_walk_tree(cs->as, eaddr & R_EADDR_MASK, base_addr,
nls, g_raddr, g_page_size, &pte,
&fault_cause, &pte_addr);
if (ret) {
/* No valid PTE */
if (guest_visible) {
ppc_radix64_raise_si(cpu, access_type, eaddr, fault_cause);
}
return ret;
}
} else {
uint64_t rpn, mask;
index = (eaddr & R_EADDR_MASK) >> (*g_page_size - nls); /* Shift */
index &= ((1UL << nls) - 1); /* Mask */
pte_addr = base_addr + (index * sizeof(pte));
/*
* Each process table address is subject to a partition-scoped
* translation
*/
do {
ret = ppc_radix64_partition_scoped_xlate(cpu, 0, eaddr, pte_addr,
pate, &h_raddr, &h_prot,
&h_page_size, true,
/* mmu_idx is 5 because we're translating from hypervisor scope */
5, guest_visible);
if (ret) {
return ret;
}
ret = ppc_radix64_next_level(cs->as, eaddr & R_EADDR_MASK, &h_raddr,
&nls, g_page_size, &pte, &fault_cause);
if (ret) {
/* No valid pte */
if (guest_visible) {
ppc_radix64_raise_si(cpu, access_type, eaddr, fault_cause);
}
return ret;
}
pte_addr = h_raddr;
} while (!(pte & R_PTE_LEAF));
rpn = pte & R_PTE_RPN;
mask = (1UL << *g_page_size) - 1;
/* Or high bits of rpn and low bits to ea to form whole real addr */
*g_raddr = (rpn & ~mask) | (eaddr & mask);
}
if (ppc_radix64_check_prot(cpu, access_type, pte, &fault_cause,
g_prot, mmu_idx, false)) {
/* Access denied due to protection */
if (guest_visible) {
ppc_radix64_raise_si(cpu, access_type, eaddr, fault_cause);
}
return 1;
}
if (guest_visible) {
ppc_radix64_set_rc(cpu, access_type, pte, pte_addr, g_prot);
}
return 0;
}
/*
* Radix tree translation is a 2 steps translation process:
*
* 1. Process-scoped translation: Guest Eff Addr -> Guest Real Addr
* 2. Partition-scoped translation: Guest Real Addr -> Host Real Addr
*
* MSR[HV]
* +-------------+----------------+---------------+
* | | HV = 0 | HV = 1 |
* +-------------+----------------+---------------+
* | Relocation | Partition | No |
* | = Off | Scoped | Translation |
* Relocation +-------------+----------------+---------------+
* | Relocation | Partition & | Process |
* | = On | Process Scoped | Scoped |
* +-------------+----------------+---------------+
*/
static bool ppc_radix64_xlate_impl(PowerPCCPU *cpu, vaddr eaddr,
MMUAccessType access_type, hwaddr *raddr,
int *psizep, int *protp, int mmu_idx,
bool guest_visible)
{
CPUPPCState *env = &cpu->env;
uint64_t lpid, pid;
ppc_v3_pate_t pate;
int psize, prot;
hwaddr g_raddr;
bool relocation;
assert(!(mmuidx_hv(mmu_idx) && cpu->vhyp));
relocation = !mmuidx_real(mmu_idx);
/* HV or virtual hypervisor Real Mode Access */
if (!relocation && (mmuidx_hv(mmu_idx) || vhyp_flat_addressing(cpu))) {
/* In real mode top 4 effective addr bits (mostly) ignored */
*raddr = eaddr & 0x0FFFFFFFFFFFFFFFULL;
/* In HV mode, add HRMOR if top EA bit is clear */
if (mmuidx_hv(mmu_idx) || !env->has_hv_mode) {
if (!(eaddr >> 63)) {
*raddr |= env->spr[SPR_HRMOR];
}
}
*protp = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
*psizep = TARGET_PAGE_BITS;
return true;
}
/*
* Check UPRT (we avoid the check in real mode to deal with
* transitional states during kexec.
*/
if (guest_visible && !ppc64_use_proc_tbl(cpu)) {
qemu_log_mask(LOG_GUEST_ERROR,
"LPCR:UPRT not set in radix mode ! LPCR="
TARGET_FMT_lx "\n", env->spr[SPR_LPCR]);
}
/* Virtual Mode Access - get the fully qualified address */
if (!ppc_radix64_get_fully_qualified_addr(&cpu->env, eaddr, &lpid, &pid)) {
if (guest_visible) {
ppc_radix64_raise_segi(cpu, access_type, eaddr);
}
return false;
}
/* Get Process Table */
if (cpu->vhyp) {
PPCVirtualHypervisorClass *vhc;
vhc = PPC_VIRTUAL_HYPERVISOR_GET_CLASS(cpu->vhyp);
if (!vhc->get_pate(cpu->vhyp, cpu, lpid, &pate)) {
if (guest_visible) {
ppc_radix64_raise_hsi(cpu, access_type, eaddr, eaddr,
DSISR_R_BADCONFIG);
}
return false;
}
} else {
if (!ppc64_v3_get_pate(cpu, lpid, &pate)) {
if (guest_visible) {
ppc_radix64_raise_hsi(cpu, access_type, eaddr, eaddr,
DSISR_R_BADCONFIG);
}
return false;
}
if (!validate_pate(cpu, lpid, &pate)) {
if (guest_visible) {
ppc_radix64_raise_hsi(cpu, access_type, eaddr, eaddr,
DSISR_R_BADCONFIG);
}
return false;
}
}
*psizep = INT_MAX;
*protp = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
/*
* Perform process-scoped translation if relocation enabled.
*
* - Translates an effective address to a host real address in
* quadrants 0 and 3 when HV=1.
*
* - Translates an effective address to a guest real address.
*/
if (relocation) {
int ret = ppc_radix64_process_scoped_xlate(cpu, access_type, eaddr, pid,
pate, &g_raddr, &prot,
&psize, mmu_idx, guest_visible);
if (ret) {
return false;
}
*psizep = MIN(*psizep, psize);
*protp &= prot;
} else {
g_raddr = eaddr & R_EADDR_MASK;
}
if (vhyp_flat_addressing(cpu)) {
*raddr = g_raddr;
} else {
/*
* Perform partition-scoped translation if !HV or HV access to
* quadrants 1 or 2. Translates a guest real address to a host
* real address.
*/
if (lpid || !mmuidx_hv(mmu_idx)) {
int ret;
ret = ppc_radix64_partition_scoped_xlate(cpu, access_type, eaddr,
g_raddr, pate, raddr,
&prot, &psize, false,
mmu_idx, guest_visible);
if (ret) {
return false;
}
*psizep = MIN(*psizep, psize);
*protp &= prot;
} else {
*raddr = g_raddr;
}
}
return true;
}
bool ppc_radix64_xlate(PowerPCCPU *cpu, vaddr eaddr, MMUAccessType access_type,
hwaddr *raddrp, int *psizep, int *protp, int mmu_idx,
bool guest_visible)
{
bool ret = ppc_radix64_xlate_impl(cpu, eaddr, access_type, raddrp,
psizep, protp, mmu_idx, guest_visible);
qemu_log_mask(CPU_LOG_MMU, "%s for %s @0x%"VADDR_PRIx
" mmu_idx %u (prot %c%c%c) -> 0x%"HWADDR_PRIx"\n",
__func__, access_str(access_type),
eaddr, mmu_idx,
*protp & PAGE_READ ? 'r' : '-',
*protp & PAGE_WRITE ? 'w' : '-',
*protp & PAGE_EXEC ? 'x' : '-',
*raddrp);
return ret;
}
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