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Diffstat (limited to 'accel/kvm/kvm-all.c')
-rw-r--r--accel/kvm/kvm-all.c161
1 files changed, 141 insertions, 20 deletions
diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
index ca00daa..b2f1a5b 100644
--- a/accel/kvm/kvm-all.c
+++ b/accel/kvm/kvm-all.c
@@ -41,6 +41,9 @@
#include "hw/irq.h"
#include "sysemu/sev.h"
#include "sysemu/balloon.h"
+#include "qapi/visitor.h"
+#include "qapi/qapi-types-common.h"
+#include "qapi/qapi-visit-common.h"
#include "hw/boards.h"
@@ -92,6 +95,10 @@ struct KVMState
int max_nested_state_len;
int many_ioeventfds;
int intx_set_mask;
+ int kvm_shadow_mem;
+ bool kernel_irqchip_allowed;
+ bool kernel_irqchip_required;
+ bool kernel_irqchip_split;
bool sync_mmu;
bool manual_dirty_log_protect;
/* The man page (and posix) say ioctl numbers are signed int, but
@@ -518,6 +525,27 @@ static int kvm_get_dirty_pages_log_range(MemoryRegionSection *section,
#define ALIGN(x, y) (((x)+(y)-1) & ~((y)-1))
+/* Allocate the dirty bitmap for a slot */
+static void kvm_memslot_init_dirty_bitmap(KVMSlot *mem)
+{
+ /*
+ * XXX bad kernel interface alert
+ * For dirty bitmap, kernel allocates array of size aligned to
+ * bits-per-long. But for case when the kernel is 64bits and
+ * the userspace is 32bits, userspace can't align to the same
+ * bits-per-long, since sizeof(long) is different between kernel
+ * and user space. This way, userspace will provide buffer which
+ * may be 4 bytes less than the kernel will use, resulting in
+ * userspace memory corruption (which is not detectable by valgrind
+ * too, in most cases).
+ * So for now, let's align to 64 instead of HOST_LONG_BITS here, in
+ * a hope that sizeof(long) won't become >8 any time soon.
+ */
+ hwaddr bitmap_size = ALIGN(((mem->memory_size) >> TARGET_PAGE_BITS),
+ /*HOST_LONG_BITS*/ 64) / 8;
+ mem->dirty_bmap = g_malloc0(bitmap_size);
+}
+
/**
* kvm_physical_sync_dirty_bitmap - Sync dirty bitmap from kernel space
*
@@ -550,23 +578,9 @@ static int kvm_physical_sync_dirty_bitmap(KVMMemoryListener *kml,
goto out;
}
- /* XXX bad kernel interface alert
- * For dirty bitmap, kernel allocates array of size aligned to
- * bits-per-long. But for case when the kernel is 64bits and
- * the userspace is 32bits, userspace can't align to the same
- * bits-per-long, since sizeof(long) is different between kernel
- * and user space. This way, userspace will provide buffer which
- * may be 4 bytes less than the kernel will use, resulting in
- * userspace memory corruption (which is not detectable by valgrind
- * too, in most cases).
- * So for now, let's align to 64 instead of HOST_LONG_BITS here, in
- * a hope that sizeof(long) won't become >8 any time soon.
- */
if (!mem->dirty_bmap) {
- hwaddr bitmap_size = ALIGN(((mem->memory_size) >> TARGET_PAGE_BITS),
- /*HOST_LONG_BITS*/ 64) / 8;
/* Allocate on the first log_sync, once and for all */
- mem->dirty_bmap = g_malloc0(bitmap_size);
+ kvm_memslot_init_dirty_bitmap(mem);
}
d.dirty_bitmap = mem->dirty_bmap;
@@ -1067,6 +1081,13 @@ static void kvm_set_phys_mem(KVMMemoryListener *kml,
mem->ram = ram;
mem->flags = kvm_mem_flags(mr);
+ if (mem->flags & KVM_MEM_LOG_DIRTY_PAGES) {
+ /*
+ * Reallocate the bmap; it means it doesn't disappear in
+ * middle of a migrate.
+ */
+ kvm_memslot_init_dirty_bitmap(mem);
+ }
err = kvm_set_user_memory_region(kml, mem, true);
if (err) {
fprintf(stderr, "%s: error registering slot: %s\n", __func__,
@@ -1758,7 +1779,7 @@ void kvm_irqchip_set_qemuirq_gsi(KVMState *s, qemu_irq irq, int gsi)
g_hash_table_insert(s->gsimap, irq, GINT_TO_POINTER(gsi));
}
-static void kvm_irqchip_create(MachineState *machine, KVMState *s)
+static void kvm_irqchip_create(KVMState *s)
{
int ret;
@@ -1776,9 +1797,9 @@ static void kvm_irqchip_create(MachineState *machine, KVMState *s)
/* First probe and see if there's a arch-specific hook to create the
* in-kernel irqchip for us */
- ret = kvm_arch_irqchip_create(machine, s);
+ ret = kvm_arch_irqchip_create(s);
if (ret == 0) {
- if (machine_kernel_irqchip_split(machine)) {
+ if (s->kernel_irqchip_split) {
perror("Split IRQ chip mode not supported.");
exit(1);
} else {
@@ -2049,8 +2070,8 @@ static int kvm_init(MachineState *ms)
goto err;
}
- if (machine_kernel_irqchip_allowed(ms)) {
- kvm_irqchip_create(ms, s);
+ if (s->kernel_irqchip_allowed) {
+ kvm_irqchip_create(s);
}
if (kvm_eventfds_allowed) {
@@ -2940,6 +2961,93 @@ static bool kvm_accel_has_memory(MachineState *ms, AddressSpace *as,
return false;
}
+static void kvm_get_kvm_shadow_mem(Object *obj, Visitor *v,
+ const char *name, void *opaque,
+ Error **errp)
+{
+ KVMState *s = KVM_STATE(obj);
+ int64_t value = s->kvm_shadow_mem;
+
+ visit_type_int(v, name, &value, errp);
+}
+
+static void kvm_set_kvm_shadow_mem(Object *obj, Visitor *v,
+ const char *name, void *opaque,
+ Error **errp)
+{
+ KVMState *s = KVM_STATE(obj);
+ Error *error = NULL;
+ int64_t value;
+
+ visit_type_int(v, name, &value, &error);
+ if (error) {
+ error_propagate(errp, error);
+ return;
+ }
+
+ s->kvm_shadow_mem = value;
+}
+
+static void kvm_set_kernel_irqchip(Object *obj, Visitor *v,
+ const char *name, void *opaque,
+ Error **errp)
+{
+ Error *err = NULL;
+ KVMState *s = KVM_STATE(obj);
+ OnOffSplit mode;
+
+ visit_type_OnOffSplit(v, name, &mode, &err);
+ if (err) {
+ error_propagate(errp, err);
+ return;
+ } else {
+ switch (mode) {
+ case ON_OFF_SPLIT_ON:
+ s->kernel_irqchip_allowed = true;
+ s->kernel_irqchip_required = true;
+ s->kernel_irqchip_split = false;
+ break;
+ case ON_OFF_SPLIT_OFF:
+ s->kernel_irqchip_allowed = false;
+ s->kernel_irqchip_required = false;
+ s->kernel_irqchip_split = false;
+ break;
+ case ON_OFF_SPLIT_SPLIT:
+ s->kernel_irqchip_allowed = true;
+ s->kernel_irqchip_required = true;
+ s->kernel_irqchip_split = true;
+ break;
+ default:
+ /* The value was checked in visit_type_OnOffSplit() above. If
+ * we get here, then something is wrong in QEMU.
+ */
+ abort();
+ }
+ }
+}
+
+bool kvm_kernel_irqchip_allowed(void)
+{
+ return kvm_state->kernel_irqchip_allowed;
+}
+
+bool kvm_kernel_irqchip_required(void)
+{
+ return kvm_state->kernel_irqchip_required;
+}
+
+bool kvm_kernel_irqchip_split(void)
+{
+ return kvm_state->kernel_irqchip_split;
+}
+
+static void kvm_accel_instance_init(Object *obj)
+{
+ KVMState *s = KVM_STATE(obj);
+
+ s->kvm_shadow_mem = -1;
+}
+
static void kvm_accel_class_init(ObjectClass *oc, void *data)
{
AccelClass *ac = ACCEL_CLASS(oc);
@@ -2947,11 +3055,24 @@ static void kvm_accel_class_init(ObjectClass *oc, void *data)
ac->init_machine = kvm_init;
ac->has_memory = kvm_accel_has_memory;
ac->allowed = &kvm_allowed;
+
+ object_class_property_add(oc, "kernel-irqchip", "on|off|split",
+ NULL, kvm_set_kernel_irqchip,
+ NULL, NULL, &error_abort);
+ object_class_property_set_description(oc, "kernel-irqchip",
+ "Configure KVM in-kernel irqchip", &error_abort);
+
+ object_class_property_add(oc, "kvm-shadow-mem", "int",
+ kvm_get_kvm_shadow_mem, kvm_set_kvm_shadow_mem,
+ NULL, NULL, &error_abort);
+ object_class_property_set_description(oc, "kvm-shadow-mem",
+ "KVM shadow MMU size", &error_abort);
}
static const TypeInfo kvm_accel_type = {
.name = TYPE_KVM_ACCEL,
.parent = TYPE_ACCEL,
+ .instance_init = kvm_accel_instance_init,
.class_init = kvm_accel_class_init,
.instance_size = sizeof(KVMState),
};
generated by cgit v1.1 at 2024-08-21 18:07:40 +0000