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-rw-r--r--target-ppc/kvm.c54
-rw-r--r--target-ppc/kvm_ppc.h19
-rw-r--r--target-ppc/mmu-hash64.c78
-rw-r--r--target-ppc/mmu-hash64.h22
4 files changed, 152 insertions, 21 deletions
diff --git a/target-ppc/kvm.c b/target-ppc/kvm.c
index 969ebddd4c..e00991920a 100644
--- a/target-ppc/kvm.c
+++ b/target-ppc/kvm.c
@@ -1788,6 +1788,11 @@ bool kvmppc_has_cap_epr(void)
return cap_epr;
}
+bool kvmppc_has_cap_htab_fd(void)
+{
+ return cap_htab_fd;
+}
+
static int kvm_ppc_register_host_cpu_type(void)
{
TypeInfo type_info = {
@@ -1938,3 +1943,52 @@ void kvm_arch_remove_all_hw_breakpoints(void)
void kvm_arch_update_guest_debug(CPUState *cpu, struct kvm_guest_debug *dbg)
{
}
+
+struct kvm_get_htab_buf {
+ struct kvm_get_htab_header header;
+ /*
+ * We require one extra byte for read
+ */
+ target_ulong hpte[(HPTES_PER_GROUP * 2) + 1];
+};
+
+uint64_t kvmppc_hash64_read_pteg(PowerPCCPU *cpu, target_ulong pte_index)
+{
+ int htab_fd;
+ struct kvm_get_htab_fd ghf;
+ struct kvm_get_htab_buf *hpte_buf;
+
+ ghf.flags = 0;
+ ghf.start_index = pte_index;
+ htab_fd = kvm_vm_ioctl(kvm_state, KVM_PPC_GET_HTAB_FD, &ghf);
+ if (htab_fd < 0) {
+ goto error_out;
+ }
+
+ hpte_buf = g_malloc0(sizeof(*hpte_buf));
+ /*
+ * Read the hpte group
+ */
+ if (read(htab_fd, hpte_buf, sizeof(*hpte_buf)) < 0) {
+ goto out_close;
+ }
+
+ close(htab_fd);
+ return (uint64_t)(uintptr_t) hpte_buf->hpte;
+
+out_close:
+ g_free(hpte_buf);
+ close(htab_fd);
+error_out:
+ return 0;
+}
+
+void kvmppc_hash64_free_pteg(uint64_t token)
+{
+ struct kvm_get_htab_buf *htab_buf;
+
+ htab_buf = container_of((void *)(uintptr_t) token, struct kvm_get_htab_buf,
+ hpte);
+ g_free(htab_buf);
+ return;
+}
diff --git a/target-ppc/kvm_ppc.h b/target-ppc/kvm_ppc.h
index 5f78e4be14..800e1ad083 100644
--- a/target-ppc/kvm_ppc.h
+++ b/target-ppc/kvm_ppc.h
@@ -39,10 +39,13 @@ uint64_t kvmppc_rma_size(uint64_t current_size, unsigned int hash_shift);
int kvmppc_fixup_cpu(PowerPCCPU *cpu);
bool kvmppc_has_cap_epr(void);
int kvmppc_define_rtas_kernel_token(uint32_t token, const char *function);
+bool kvmppc_has_cap_htab_fd(void);
int kvmppc_get_htab_fd(bool write);
int kvmppc_save_htab(QEMUFile *f, int fd, size_t bufsize, int64_t max_ns);
int kvmppc_load_htab_chunk(QEMUFile *f, int fd, uint32_t index,
uint16_t n_valid, uint16_t n_invalid);
+uint64_t kvmppc_hash64_read_pteg(PowerPCCPU *cpu, target_ulong pte_index);
+void kvmppc_hash64_free_pteg(uint64_t token);
#else
@@ -171,6 +174,11 @@ static inline int kvmppc_define_rtas_kernel_token(uint32_t token,
return -1;
}
+static inline bool kvmppc_has_cap_htab_fd(void)
+{
+ return false;
+}
+
static inline int kvmppc_get_htab_fd(bool write)
{
return -1;
@@ -188,6 +196,17 @@ static inline int kvmppc_load_htab_chunk(QEMUFile *f, int fd, uint32_t index,
abort();
}
+static inline uint64_t kvmppc_hash64_read_pteg(PowerPCCPU *cpu,
+ target_ulong pte_index)
+{
+ abort();
+}
+
+static inline void kvmppc_hash64_free_pteg(uint64_t token)
+{
+ abort();
+}
+
#endif
#ifndef CONFIG_KVM
diff --git a/target-ppc/mmu-hash64.c b/target-ppc/mmu-hash64.c
index 739dece64a..68a6f69112 100644
--- a/target-ppc/mmu-hash64.c
+++ b/target-ppc/mmu-hash64.c
@@ -41,6 +41,11 @@
#endif
/*
+ * Used to indicate whether we have allocated htab in the
+ * host kernel
+ */
+bool kvmppc_kern_htab;
+/*
* SLB handling
*/
@@ -310,29 +315,76 @@ static int ppc_hash64_amr_prot(CPUPPCState *env, ppc_hash_pte64_t pte)
return prot;
}
-static hwaddr ppc_hash64_pteg_search(CPUPPCState *env, hwaddr pteg_off,
+uint64_t ppc_hash64_start_access(PowerPCCPU *cpu, target_ulong pte_index)
+{
+ uint64_t token = 0;
+ hwaddr pte_offset;
+
+ pte_offset = pte_index * HASH_PTE_SIZE_64;
+ if (kvmppc_kern_htab) {
+ /*
+ * HTAB is controlled by KVM. Fetch the PTEG into a new buffer.
+ */
+ token = kvmppc_hash64_read_pteg(cpu, pte_index);
+ if (token) {
+ return token;
+ }
+ /*
+ * pteg read failed, even though we have allocated htab via
+ * kvmppc_reset_htab.
+ */
+ return 0;
+ }
+ /*
+ * HTAB is controlled by QEMU. Just point to the internally
+ * accessible PTEG.
+ */
+ if (cpu->env.external_htab) {
+ token = (uint64_t)(uintptr_t) cpu->env.external_htab + pte_offset;
+ } else if (cpu->env.htab_base) {
+ token = cpu->env.htab_base + pte_offset;
+ }
+ return token;
+}
+
+void ppc_hash64_stop_access(uint64_t token)
+{
+ if (kvmppc_kern_htab) {
+ return kvmppc_hash64_free_pteg(token);
+ }
+}
+
+static hwaddr ppc_hash64_pteg_search(CPUPPCState *env, hwaddr hash,
bool secondary, target_ulong ptem,
ppc_hash_pte64_t *pte)
{
- hwaddr pte_offset = pteg_off;
- target_ulong pte0, pte1;
int i;
+ uint64_t token;
+ target_ulong pte0, pte1;
+ target_ulong pte_index;
+ pte_index = (hash & env->htab_mask) * HPTES_PER_GROUP;
+ token = ppc_hash64_start_access(ppc_env_get_cpu(env), pte_index);
+ if (!token) {
+ return -1;
+ }
for (i = 0; i < HPTES_PER_GROUP; i++) {
- pte0 = ppc_hash64_load_hpte0(env, pte_offset);
- pte1 = ppc_hash64_load_hpte1(env, pte_offset);
+ pte0 = ppc_hash64_load_hpte0(env, token, i);
+ pte1 = ppc_hash64_load_hpte1(env, token, i);
if ((pte0 & HPTE64_V_VALID)
&& (secondary == !!(pte0 & HPTE64_V_SECONDARY))
&& HPTE64_V_COMPARE(pte0, ptem)) {
pte->pte0 = pte0;
pte->pte1 = pte1;
- return pte_offset;
+ ppc_hash64_stop_access(token);
+ return (pte_index + i) * HASH_PTE_SIZE_64;
}
-
- pte_offset += HASH_PTE_SIZE_64;
}
-
+ ppc_hash64_stop_access(token);
+ /*
+ * We didn't find a valid entry.
+ */
return -1;
}
@@ -340,7 +392,7 @@ static hwaddr ppc_hash64_htab_lookup(CPUPPCState *env,
ppc_slb_t *slb, target_ulong eaddr,
ppc_hash_pte64_t *pte)
{
- hwaddr pteg_off, pte_offset;
+ hwaddr pte_offset;
hwaddr hash;
uint64_t vsid, epnshift, epnmask, epn, ptem;
@@ -375,8 +427,7 @@ static hwaddr ppc_hash64_htab_lookup(CPUPPCState *env,
" vsid=" TARGET_FMT_lx " ptem=" TARGET_FMT_lx
" hash=" TARGET_FMT_plx "\n",
env->htab_base, env->htab_mask, vsid, ptem, hash);
- pteg_off = (hash & env->htab_mask) * HASH_PTEG_SIZE_64;
- pte_offset = ppc_hash64_pteg_search(env, pteg_off, 0, ptem, pte);
+ pte_offset = ppc_hash64_pteg_search(env, hash, 0, ptem, pte);
if (pte_offset == -1) {
/* Secondary PTEG lookup */
@@ -385,8 +436,7 @@ static hwaddr ppc_hash64_htab_lookup(CPUPPCState *env,
" hash=" TARGET_FMT_plx "\n", env->htab_base,
env->htab_mask, vsid, ptem, ~hash);
- pteg_off = (~hash & env->htab_mask) * HASH_PTEG_SIZE_64;
- pte_offset = ppc_hash64_pteg_search(env, pteg_off, 1, ptem, pte);
+ pte_offset = ppc_hash64_pteg_search(env, ~hash, 1, ptem, pte);
}
return pte_offset;
diff --git a/target-ppc/mmu-hash64.h b/target-ppc/mmu-hash64.h
index a8da558ca2..e7cb96fe66 100644
--- a/target-ppc/mmu-hash64.h
+++ b/target-ppc/mmu-hash64.h
@@ -75,26 +75,34 @@ int ppc_hash64_handle_mmu_fault(CPUPPCState *env, target_ulong address, int rw,
#define HPTE64_V_1TB_SEG 0x4000000000000000ULL
#define HPTE64_V_VRMA_MASK 0x4001ffffff000000ULL
+
+extern bool kvmppc_kern_htab;
+uint64_t ppc_hash64_start_access(PowerPCCPU *cpu, target_ulong pte_index);
+void ppc_hash64_stop_access(uint64_t token);
+
static inline target_ulong ppc_hash64_load_hpte0(CPUPPCState *env,
- hwaddr pte_offset)
+ uint64_t token, int index)
{
CPUState *cs = ENV_GET_CPU(env);
+ uint64_t addr;
+ addr = token + (index * HASH_PTE_SIZE_64);
if (env->external_htab) {
- return ldq_p(env->external_htab + pte_offset);
+ return ldq_p((const void *)(uintptr_t)addr);
} else {
- return ldq_phys(cs->as, env->htab_base + pte_offset);
+ return ldq_phys(cs->as, addr);
}
}
static inline target_ulong ppc_hash64_load_hpte1(CPUPPCState *env,
- hwaddr pte_offset)
+ uint64_t token, int index)
{
CPUState *cs = ENV_GET_CPU(env);
+ uint64_t addr;
+ addr = token + (index * HASH_PTE_SIZE_64) + HASH_PTE_SIZE_64/2;
if (env->external_htab) {
- return ldq_p(env->external_htab + pte_offset + HASH_PTE_SIZE_64/2);
+ return ldq_p((const void *)(uintptr_t)addr);
} else {
- return ldq_phys(cs->as,
- env->htab_base + pte_offset + HASH_PTE_SIZE_64/2);
+ return ldq_phys(cs->as, addr);
}
}
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-27 01:59:59 +0000