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[Qemu-devel] [PATCH 5/5] pseries: Add support for new KVM hash table con
|
From: |
David Gibson |
|
Subject: |
[Qemu-devel] [PATCH 5/5] pseries: Add support for new KVM hash table control call |
|
Date: |
Tue, 31 Jul 2012 16:09:05 +1000 |
From: Ben Herrenschmidt <address@hidden>
This adds support for then new "reset htab" ioctl which allows qemu
to properly cleanup the MMU hash table when the guest is reset. With
the corresponding kernel support, reset of a guest now works properly.
This also paves the way for indicating a different size hash table
to the kernel and for the kernel to be able to impose limits on
the requested size.
Signed-off-by: Benjamin Herrenschmidt <address@hidden>
---
hw/spapr.c | 294 ++++++++++++++++++++++++++++++--------------------
hw/spapr.h | 4 +-
target-ppc/kvm.c | 51 +++++++--
target-ppc/kvm_ppc.h | 20 ++++
4 files changed, 243 insertions(+), 126 deletions(-)
diff --git a/hw/spapr.c b/hw/spapr.c
index 693441e..2453bae 100644
--- a/hw/spapr.c
+++ b/hw/spapr.c
@@ -83,6 +83,8 @@
#define PHANDLE_XICP 0x00001111
+#define HTAB_SIZE(spapr) (1ULL << ((spapr)->htab_shift))
+
sPAPREnvironment *spapr;
static bool spapr_has_graphics;
@@ -111,12 +113,13 @@ qemu_irq spapr_allocate_irq(uint32_t hint, uint32_t
*irq_num,
return qirq;
}
-static int spapr_set_associativity(void *fdt, sPAPREnvironment *spapr)
+static int spapr_fixup_cpu_dt(void *fdt, sPAPREnvironment *spapr)
{
int ret = 0, offset;
CPUPPCState *env;
char cpu_model[32];
int smt = kvmppc_smt_threads();
+ uint32_t pft_size_prop[] = {0, cpu_to_be32(spapr->htab_shift)};
assert(spapr->cpu_model);
@@ -140,8 +143,16 @@ static int spapr_set_associativity(void *fdt,
sPAPREnvironment *spapr)
return offset;
}
- ret = fdt_setprop(fdt, offset, "ibm,associativity", associativity,
- sizeof(associativity));
+ if (nb_numa_nodes > 1) {
+ ret = fdt_setprop(fdt, offset, "ibm,associativity", associativity,
+ sizeof(associativity));
+ if (ret < 0) {
+ return ret;
+ }
+ }
+
+ ret = fdt_setprop(fdt, offset, "ibm,pft-size",
+ pft_size_prop, sizeof(pft_size_prop));
if (ret < 0) {
return ret;
}
@@ -183,45 +194,36 @@ static size_t create_page_sizes_prop(CPUPPCState *env,
uint32_t *prop,
return (p - prop) * sizeof(uint32_t);
}
+#define _FDT(exp) \
+ do { \
+ int ret = (exp); \
+ if (ret < 0) { \
+ fprintf(stderr, "qemu: error creating device tree: %s: %s\n", \
+ #exp, fdt_strerror(ret)); \
+ exit(1); \
+ } \
+ } while (0)
+
+
static void *spapr_create_fdt_skel(const char *cpu_model,
- target_phys_addr_t rma_size,
target_phys_addr_t initrd_base,
target_phys_addr_t initrd_size,
target_phys_addr_t kernel_size,
const char *boot_device,
- const char *kernel_cmdline,
- long hash_shift)
+ const char *kernel_cmdline)
{
void *fdt;
CPUPPCState *env;
- uint64_t mem_reg_property[2];
uint32_t start_prop = cpu_to_be32(initrd_base);
uint32_t end_prop = cpu_to_be32(initrd_base + initrd_size);
- uint32_t pft_size_prop[] = {0, cpu_to_be32(hash_shift)};
char hypertas_prop[] = "hcall-pft\0hcall-term\0hcall-dabr\0hcall-interrupt"
"\0hcall-tce\0hcall-vio\0hcall-splpar\0hcall-bulk";
char qemu_hypertas_prop[] = "hcall-memop1";
+ uint32_t refpoints[] = {cpu_to_be32(0x4), cpu_to_be32(0x4)};
uint32_t interrupt_server_ranges_prop[] = {0, cpu_to_be32(smp_cpus)};
- int i;
char *modelname;
- int smt = kvmppc_smt_threads();
+ int i, smt = kvmppc_smt_threads();
unsigned char vec5[] = {0x0, 0x0, 0x0, 0x0, 0x0, 0x80};
- uint32_t refpoints[] = {cpu_to_be32(0x4), cpu_to_be32(0x4)};
- uint32_t associativity[] = {cpu_to_be32(0x4), cpu_to_be32(0x0),
- cpu_to_be32(0x0), cpu_to_be32(0x0),
- cpu_to_be32(0x0)};
- char mem_name[32];
- target_phys_addr_t node0_size, mem_start;
-
-#define _FDT(exp) \
- do { \
- int ret = (exp); \
- if (ret < 0) { \
- fprintf(stderr, "qemu: error creating device tree: %s: %s\n", \
- #exp, fdt_strerror(ret)); \
- exit(1); \
- } \
- } while (0)
fdt = g_malloc0(FDT_MAX_SIZE);
_FDT((fdt_create(fdt, FDT_MAX_SIZE)));
@@ -266,55 +268,6 @@ static void *spapr_create_fdt_skel(const char *cpu_model,
_FDT((fdt_end_node(fdt)));
- /* memory node(s) */
- node0_size = (nb_numa_nodes > 1) ? node_mem[0] : ram_size;
- if (rma_size > node0_size) {
- rma_size = node0_size;
- }
-
- /* RMA */
- mem_reg_property[0] = 0;
- mem_reg_property[1] = cpu_to_be64(rma_size);
- _FDT((fdt_begin_node(fdt, "address@hidden")));
- _FDT((fdt_property_string(fdt, "device_type", "memory")));
- _FDT((fdt_property(fdt, "reg", mem_reg_property,
- sizeof(mem_reg_property))));
- _FDT((fdt_property(fdt, "ibm,associativity", associativity,
- sizeof(associativity))));
- _FDT((fdt_end_node(fdt)));
-
- /* RAM: Node 0 */
- if (node0_size > rma_size) {
- mem_reg_property[0] = cpu_to_be64(rma_size);
- mem_reg_property[1] = cpu_to_be64(node0_size - rma_size);
-
- sprintf(mem_name, "memory@" TARGET_FMT_lx, rma_size);
- _FDT((fdt_begin_node(fdt, mem_name)));
- _FDT((fdt_property_string(fdt, "device_type", "memory")));
- _FDT((fdt_property(fdt, "reg", mem_reg_property,
- sizeof(mem_reg_property))));
- _FDT((fdt_property(fdt, "ibm,associativity", associativity,
- sizeof(associativity))));
- _FDT((fdt_end_node(fdt)));
- }
-
- /* RAM: Node 1 and beyond */
- mem_start = node0_size;
- for (i = 1; i < nb_numa_nodes; i++) {
- mem_reg_property[0] = cpu_to_be64(mem_start);
- mem_reg_property[1] = cpu_to_be64(node_mem[i]);
- associativity[3] = associativity[4] = cpu_to_be32(i);
- sprintf(mem_name, "memory@" TARGET_FMT_lx, mem_start);
- _FDT((fdt_begin_node(fdt, mem_name)));
- _FDT((fdt_property_string(fdt, "device_type", "memory")));
- _FDT((fdt_property(fdt, "reg", mem_reg_property,
- sizeof(mem_reg_property))));
- _FDT((fdt_property(fdt, "ibm,associativity", associativity,
- sizeof(associativity))));
- _FDT((fdt_end_node(fdt)));
- mem_start += node_mem[i];
- }
-
/* cpus */
_FDT((fdt_begin_node(fdt, "cpus")));
@@ -366,8 +319,6 @@ static void *spapr_create_fdt_skel(const char *cpu_model,
_FDT((fdt_property_cell(fdt, "timebase-frequency", tbfreq)));
_FDT((fdt_property_cell(fdt, "clock-frequency", cpufreq)));
_FDT((fdt_property_cell(fdt, "ibm,slb-size", env->slb_nr)));
- _FDT((fdt_property(fdt, "ibm,pft-size",
- pft_size_prop, sizeof(pft_size_prop))));
_FDT((fdt_property_string(fdt, "status", "okay")));
_FDT((fdt_property(fdt, "64-bit", NULL, 0)));
@@ -466,6 +417,68 @@ static void *spapr_create_fdt_skel(const char *cpu_model,
return fdt;
}
+static int spapr_populate_memory(sPAPREnvironment *spapr, void *fdt)
+{
+ uint32_t associativity[] = {cpu_to_be32(0x4), cpu_to_be32(0x0),
+ cpu_to_be32(0x0), cpu_to_be32(0x0),
+ cpu_to_be32(0x0)};
+ char mem_name[32];
+ target_phys_addr_t node0_size, mem_start;
+ uint64_t mem_reg_property[2];
+ int i, off;
+
+ /* memory node(s) */
+ node0_size = (nb_numa_nodes > 1) ? node_mem[0] : ram_size;
+ if (spapr->rma_size > node0_size) {
+ spapr->rma_size = node0_size;
+ }
+
+ /* RMA */
+ mem_reg_property[0] = 0;
+ mem_reg_property[1] = cpu_to_be64(spapr->rma_size);
+ off = fdt_add_subnode(fdt, 0, "address@hidden");
+ _FDT(off);
+ _FDT((fdt_setprop_string(fdt, off, "device_type", "memory")));
+ _FDT((fdt_setprop(fdt, off, "reg", mem_reg_property,
+ sizeof(mem_reg_property))));
+ _FDT((fdt_setprop(fdt, off, "ibm,associativity", associativity,
+ sizeof(associativity))));
+
+ /* RAM: Node 0 */
+ if (node0_size > spapr->rma_size) {
+ mem_reg_property[0] = cpu_to_be64(spapr->rma_size);
+ mem_reg_property[1] = cpu_to_be64(node0_size - spapr->rma_size);
+
+ sprintf(mem_name, "memory@" TARGET_FMT_lx, spapr->rma_size);
+ off = fdt_add_subnode(fdt, 0, mem_name);
+ _FDT(off);
+ _FDT((fdt_setprop_string(fdt, off, "device_type", "memory")));
+ _FDT((fdt_setprop(fdt, off, "reg", mem_reg_property,
+ sizeof(mem_reg_property))));
+ _FDT((fdt_setprop(fdt, off, "ibm,associativity", associativity,
+ sizeof(associativity))));
+ }
+
+ /* RAM: Node 1 and beyond */
+ mem_start = node0_size;
+ for (i = 1; i < nb_numa_nodes; i++) {
+ mem_reg_property[0] = cpu_to_be64(mem_start);
+ mem_reg_property[1] = cpu_to_be64(node_mem[i]);
+ associativity[3] = associativity[4] = cpu_to_be32(i);
+ sprintf(mem_name, "memory@" TARGET_FMT_lx, mem_start);
+ off = fdt_add_subnode(fdt, 0, mem_name);
+ _FDT(off);
+ _FDT((fdt_setprop_string(fdt, off, "device_type", "memory")));
+ _FDT((fdt_setprop(fdt, off, "reg", mem_reg_property,
+ sizeof(mem_reg_property))));
+ _FDT((fdt_setprop(fdt, off, "ibm,associativity", associativity,
+ sizeof(associativity))));
+ mem_start += node_mem[i];
+ }
+
+ return 0;
+}
+
static void spapr_finalize_fdt(sPAPREnvironment *spapr,
target_phys_addr_t fdt_addr,
target_phys_addr_t rtas_addr,
@@ -480,6 +493,12 @@ static void spapr_finalize_fdt(sPAPREnvironment *spapr,
/* open out the base tree into a temp buffer for the final tweaks */
_FDT((fdt_open_into(spapr->fdt_skel, fdt, FDT_MAX_SIZE)));
+ ret = spapr_populate_memory(spapr, fdt);
+ if (ret < 0) {
+ fprintf(stderr, "couldn't setup memory nodes in fdt\n");
+ exit(1);
+ }
+
ret = spapr_populate_vdevice(spapr->vio_bus, fdt);
if (ret < 0) {
fprintf(stderr, "couldn't setup vio devices in fdt\n");
@@ -502,11 +521,9 @@ static void spapr_finalize_fdt(sPAPREnvironment *spapr,
}
/* Advertise NUMA via ibm,associativity */
- if (nb_numa_nodes > 1) {
- ret = spapr_set_associativity(fdt, spapr);
- if (ret < 0) {
- fprintf(stderr, "Couldn't set up NUMA device tree properties\n");
- }
+ ret = spapr_fixup_cpu_dt(fdt, spapr);
+ if (ret < 0) {
+ fprintf(stderr, "Couldn't finalize CPU device tree properties\n");
}
if (!spapr_has_graphics) {
@@ -536,30 +553,74 @@ static void emulate_spapr_hypercall(CPUPPCState *env)
env->gpr[3] = spapr_hypercall(env, env->gpr[3], &env->gpr[4]);
}
+static void spapr_reset_htab(sPAPREnvironment *spapr)
+{
+ long shift;
+
+ /* allocate hash page table. For now we always make this 16mb,
+ * later we should probably make it scale to the size of guest
+ * RAM */
+
+ shift = kvmppc_reset_htab(spapr->htab_shift);
+
+ if (shift > 0) {
+ /* Kernel handles htab, we don't need to allocate one */
+ spapr->htab_shift = shift;
+ } else {
+ if (!spapr->htab) {
+ /* Allocate an htab if we don't yet have one */
+ spapr->htab = qemu_memalign(HTAB_SIZE(spapr), HTAB_SIZE(spapr));
+ }
+
+ /* And clear it */
+ memset(spapr->htab, 0, HTAB_SIZE(spapr));
+ }
+
+ /* Update the RMA size if necessary */
+ if (spapr->vrma_adjust) {
+ spapr->rma_size = kvmppc_rma_size(ram_size, spapr->htab_shift);
+ }
+}
+
static void spapr_reset(void *opaque)
{
sPAPREnvironment *spapr = (sPAPREnvironment *)opaque;
- /* flush out the hash table */
- memset(spapr->htab, 0, spapr->htab_size);
+ /* Reset the hash table & recalc the RMA */
+ spapr_reset_htab(spapr);
/* Load the fdt */
spapr_finalize_fdt(spapr, spapr->fdt_addr, spapr->rtas_addr,
spapr->rtas_size);
-
- /* Set up the entry state */
- first_cpu->gpr[3] = spapr->fdt_addr;
- first_cpu->gpr[5] = 0;
- first_cpu->halted = 0;
- first_cpu->nip = spapr->entry_point;
-
}
static void spapr_cpu_reset(void *opaque)
{
PowerPCCPU *cpu = opaque;
+ CPUPPCState *env = &cpu->env;
cpu_reset(CPU(cpu));
+
+ env->external_htab = spapr->htab;
+ env->htab_base = -1;
+ env->htab_mask = HTAB_SIZE(spapr) - 1;
+
+ env->spr[SPR_SDR1] = (unsigned long)spapr->htab |
+ (spapr->htab_shift - 18);
+
+ if (kvm_enabled()) {
+ kvmppc_update_sdr1(env);
+ }
+
+ /* Set up the entry state */
+ if (env == first_cpu) {
+ env->gpr[3] = spapr->fdt_addr;
+ env->gpr[5] = 0;
+ env->halted = 0;
+ env->nip = spapr->entry_point;
+ }
+
+ tb_flush(env);
}
static bool spapr_vga_init(sPAPREnvironment *spapr)
@@ -606,11 +667,10 @@ static void ppc_spapr_init(ram_addr_t ram_size,
int i;
MemoryRegion *sysmem = get_system_memory();
MemoryRegion *ram = g_new(MemoryRegion, 1);
- target_phys_addr_t rma_alloc_size, rma_size;
+ target_phys_addr_t rma_alloc_size;
uint32_t initrd_base = 0;
long kernel_size = 0, initrd_size = 0;
long load_limit, rtas_limit, fw_size;
- long pteg_shift = 17;
char *filename;
spapr = g_malloc0(sizeof(*spapr));
@@ -625,20 +685,41 @@ static void ppc_spapr_init(ram_addr_t ram_size,
hw_error("qemu: Unable to create RMA\n");
exit(1);
}
+
if (rma_alloc_size && (rma_alloc_size < ram_size)) {
- rma_size = rma_alloc_size;
+ spapr->rma_size = rma_alloc_size;
} else {
- rma_size = ram_size;
+ spapr->rma_size = ram_size;
+
+ /* With KVM, we don't actually know whether KVM supports an
+ * unbounded RMA (PR KVM) or is limited by the hash table size
+ * (HV KVM using VRMA), so we always assume the latter
+ *
+ * In that case, we also limit the initial allocations for RTAS
+ * etc... to 256M since we have no way to know what the VRMA size
+ * is going to be as it depends on the size of the hash table
+ * isn't determined yet.
+ */
+ if (kvm_enabled()) {
+ spapr->vrma_adjust = 1;
+ spapr->rma_size = MIN(spapr->rma_size, 0x10000000);
+ }
}
/* We place the device tree and RTAS just below either the top of the RMA,
* or just below 2GB, whichever is lowere, so that it can be
* processed with 32-bit real mode code if necessary */
- rtas_limit = MIN(rma_size, 0x80000000);
+ rtas_limit = MIN(spapr->rma_size, 0x80000000);
spapr->rtas_addr = rtas_limit - RTAS_MAX_SIZE;
spapr->fdt_addr = spapr->rtas_addr - FDT_MAX_SIZE;
load_limit = spapr->fdt_addr - FW_OVERHEAD;
+ /* For now, always aim for a 16MB hash table */
+ /* FIXME: we should change this default based on RAM size */
+ spapr->htab_shift = 24;
+
+ qemu_register_reset(spapr_reset, spapr);
+
/* init CPUs */
if (cpu_model == NULL) {
cpu_model = kvm_enabled() ? "host" : "POWER7";
@@ -671,20 +752,8 @@ static void ppc_spapr_init(ram_addr_t ram_size,
memory_region_add_subregion(sysmem, nonrma_base, ram);
}
- /* allocate hash page table. For now we always make this 16mb,
- * later we should probably make it scale to the size of guest
- * RAM */
- spapr->htab_size = 1ULL << (pteg_shift + 7);
- spapr->htab = qemu_memalign(spapr->htab_size, spapr->htab_size);
-
for (env = first_cpu; env != NULL; env = env->next_cpu) {
- env->external_htab = spapr->htab;
- env->htab_base = -1;
- env->htab_mask = spapr->htab_size - 1;
-
/* Tell KVM that we're in PAPR mode */
- env->spr[SPR_SDR1] = (unsigned long)spapr->htab |
- ((pteg_shift + 7) - 18);
env->spr[SPR_HIOR] = 0;
if (kvm_enabled()) {
@@ -763,7 +832,7 @@ static void ppc_spapr_init(ram_addr_t ram_size,
}
}
- if (rma_size < (MIN_RMA_SLOF << 20)) {
+ if (spapr->rma_size < (MIN_RMA_SLOF << 20)) {
fprintf(stderr, "qemu: pSeries SLOF firmware requires >= "
"%ldM guest RMA (Real Mode Area memory)\n", MIN_RMA_SLOF);
exit(1);
@@ -820,14 +889,11 @@ static void ppc_spapr_init(ram_addr_t ram_size,
}
/* Prepare the device tree */
- spapr->fdt_skel = spapr_create_fdt_skel(cpu_model, rma_size,
+ spapr->fdt_skel = spapr_create_fdt_skel(cpu_model,
initrd_base, initrd_size,
kernel_size,
- boot_device, kernel_cmdline,
- pteg_shift + 7);
+ boot_device, kernel_cmdline);
assert(spapr->fdt_skel != NULL);
-
- qemu_register_reset(spapr_reset, spapr);
}
static QEMUMachine spapr_machine = {
diff --git a/hw/spapr.h b/hw/spapr.h
index 9153f29..7bac4c6 100644
--- a/hw/spapr.h
+++ b/hw/spapr.h
@@ -15,7 +15,9 @@ typedef struct sPAPREnvironment {
target_phys_addr_t ram_limit;
void *htab;
- long htab_size;
+ long htab_shift;
+ target_phys_addr_t rma_size;
+ int vrma_adjust;
target_phys_addr_t fdt_addr, rtas_addr;
long rtas_size;
void *fdt_skel;
diff --git a/target-ppc/kvm.c b/target-ppc/kvm.c
index 829e180..ab30e6e 100644
--- a/target-ppc/kvm.c
+++ b/target-ppc/kvm.c
@@ -947,7 +947,6 @@ void kvmppc_set_papr(CPUPPCState *env)
{
struct kvm_enable_cap cap = {};
struct kvm_one_reg reg = {};
- struct kvm_sregs sregs = {};
int ret;
uint64_t hior = env->spr[SPR_HIOR];
@@ -975,23 +974,26 @@ void kvmppc_set_papr(CPUPPCState *env)
"please update your host kernel!\n");
}
+ return;
+
+fail:
+ cpu_abort(env, "This KVM version does not support PAPR\n");
+}
+
+int kvmppc_update_sdr1(CPUPPCState *env)
+{
+ struct kvm_sregs sregs = {};
+ int ret;
+
/* Set SDR1 so kernel space finds the HTAB */
ret = kvm_vcpu_ioctl(env, KVM_GET_SREGS, &sregs);
if (ret) {
- goto fail;
+ return ret;
}
sregs.u.s.sdr1 = env->spr[SPR_SDR1];
- ret = kvm_vcpu_ioctl(env, KVM_SET_SREGS, &sregs);
- if (ret) {
- goto fail;
- }
-
- return;
-
-fail:
- cpu_abort(env, "This KVM version does not support PAPR\n");
+ return kvm_vcpu_ioctl(env, KVM_SET_SREGS, &sregs);
}
int kvmppc_smt_threads(void)
@@ -1042,6 +1044,15 @@ off_t kvmppc_alloc_rma(const char *name, MemoryRegion
*sysmem)
return size;
}
+uint64_t kvmppc_rma_size(uint64_t current_size, unsigned int hash_shift)
+{
+ if (cap_ppc_rma >= 2) {
+ return current_size;
+ }
+ return MIN(current_size,
+ getrampagesize() << (hash_shift - 7));
+}
+
void *kvmppc_create_spapr_tce(uint32_t liobn, uint32_t window_size, int *pfd)
{
struct kvm_create_spapr_tce args = {
@@ -1101,6 +1112,24 @@ int kvmppc_remove_spapr_tce(void *table, int fd,
uint32_t window_size)
return 0;
}
+int kvmppc_reset_htab(int shift_hint)
+{
+ uint32_t shift = shift_hint;
+
+ if (kvm_enabled() &&
+ kvm_check_extension(kvm_state, KVM_CAP_PPC_ALLOC_HTAB)) {
+ int ret;
+ ret = kvm_vm_ioctl(kvm_state, KVM_PPC_ALLOCATE_HTAB, &shift);
+ if (ret < 0) {
+ return ret;
+ }
+ return shift;
+ }
+
+ /* For now.. */
+ return 0;
+}
+
static inline uint32_t mfpvr(void)
{
uint32_t pvr;
diff --git a/target-ppc/kvm_ppc.h b/target-ppc/kvm_ppc.h
index e2f8703..7f4ea8d 100644
--- a/target-ppc/kvm_ppc.h
+++ b/target-ppc/kvm_ppc.h
@@ -27,6 +27,9 @@ int kvmppc_smt_threads(void);
off_t kvmppc_alloc_rma(const char *name, MemoryRegion *sysmem);
void *kvmppc_create_spapr_tce(uint32_t liobn, uint32_t window_size, int *pfd);
int kvmppc_remove_spapr_tce(void *table, int pfd, uint32_t window_size);
+int kvmppc_reset_htab(int shift_hint);
+uint64_t kvmppc_rma_size(uint64_t current_size, unsigned int hash_shift);
+int kvmppc_update_sdr1(CPUPPCState *env);
#endif /* !CONFIG_USER_ONLY */
const ppc_def_t *kvmppc_host_cpu_def(void);
int kvmppc_fixup_cpu(CPUPPCState *env);
@@ -94,6 +97,23 @@ static inline int kvmppc_remove_spapr_tce(void *table, int
pfd,
{
return -1;
}
+
+static inline int kvmppc_reset_htab(int shift_hint)
+{
+ return -1;
+}
+
+static inline uint64_t kvmppc_rma_size(uint64_t current_size,
+ unsigned int hash_shift)
+{
+ return ram_size;
+}
+
+static inline int kvmppc_update_sdr1(CPUPPCState *env)
+{
+ return 0;
+}
+
#endif /* !CONFIG_USER_ONLY */
static inline const ppc_def_t *kvmppc_host_cpu_def(void)
--
1.7.10.4