Introduce Virtio-loopback epsilon release:

Epsilon release introduces a new compatibility layer which make virtio-loopback
design to work with QEMU and rust-vmm vhost-user backend without require any
changes.

Signed-off-by: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
Change-Id: I52e57563e08a7d0bdc002f8e928ee61ba0c53dd9

1 files changed, 551 insertions, 0 deletions

diff --git a/include/sysemu/kvm.h b/include/sysemu/kvm.h
new file mode 100644
index 000000000..7b22aeb6a
--- /dev/null
+++ b/include/sysemu/kvm.h
@@ -0,0 +1,551 @@
+/*
+ * QEMU KVM support
+ *
+ * Copyright IBM, Corp. 2008
+ *
+ * Authors:
+ *  Anthony Liguori   <aliguori@us.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+
+#ifndef QEMU_KVM_H
+#define QEMU_KVM_H
+
+#include "qemu/queue.h"
+#include "hw/core/cpu.h"
+#include "exec/memattrs.h"
+#include "qemu/accel.h"
+#include "qom/object.h"
+
+#ifdef NEED_CPU_H
+# ifdef CONFIG_KVM
+#  include <linux/kvm.h>
+#  define CONFIG_KVM_IS_POSSIBLE
+# endif
+#else
+# define CONFIG_KVM_IS_POSSIBLE
+#endif
+
+#ifdef CONFIG_KVM_IS_POSSIBLE
+
+extern bool kvm_allowed;
+extern bool kvm_kernel_irqchip;
+extern bool kvm_split_irqchip;
+extern bool kvm_async_interrupts_allowed;
+extern bool kvm_halt_in_kernel_allowed;
+extern bool kvm_eventfds_allowed;
+extern bool kvm_irqfds_allowed;
+extern bool kvm_resamplefds_allowed;
+extern bool kvm_msi_via_irqfd_allowed;
+extern bool kvm_gsi_routing_allowed;
+extern bool kvm_gsi_direct_mapping;
+extern bool kvm_readonly_mem_allowed;
+extern bool kvm_direct_msi_allowed;
+extern bool kvm_ioeventfd_any_length_allowed;
+extern bool kvm_msi_use_devid;
+
+#define kvm_enabled()           (kvm_allowed)
+/**
+ * kvm_irqchip_in_kernel:
+ *
+ * Returns: true if an in-kernel irqchip was created.
+ * What this actually means is architecture and machine model
+ * specific: on PC, for instance, it means that the LAPIC
+ * is in kernel.  This function should never be used from generic
+ * target-independent code: use one of the following functions or
+ * some other specific check instead.
+ */
+#define kvm_irqchip_in_kernel() (kvm_kernel_irqchip)
+
+/**
+ * kvm_irqchip_is_split:
+ *
+ * Returns: true if the irqchip implementation is split between
+ * user and kernel space.  The details are architecture and
+ * machine specific.  On PC, it means that the PIC, IOAPIC, and
+ * PIT are in user space while the LAPIC is in the kernel.
+ */
+#define kvm_irqchip_is_split() (kvm_split_irqchip)
+
+/**
+ * kvm_async_interrupts_enabled:
+ *
+ * Returns: true if we can deliver interrupts to KVM
+ * asynchronously (ie by ioctl from any thread at any time)
+ * rather than having to do interrupt delivery synchronously
+ * (where the vcpu must be stopped at a suitable point first).
+ */
+#define kvm_async_interrupts_enabled() (kvm_async_interrupts_allowed)
+
+/**
+ * kvm_halt_in_kernel
+ *
+ * Returns: true if halted cpus should still get a KVM_RUN ioctl to run
+ * inside of kernel space. This only works if MP state is implemented.
+ */
+#define kvm_halt_in_kernel() (kvm_halt_in_kernel_allowed)
+
+/**
+ * kvm_eventfds_enabled:
+ *
+ * Returns: true if we can use eventfds to receive notifications
+ * from a KVM CPU (ie the kernel supports eventds and we are running
+ * with a configuration where it is meaningful to use them).
+ */
+#define kvm_eventfds_enabled() (kvm_eventfds_allowed)
+
+/**
+ * kvm_irqfds_enabled:
+ *
+ * Returns: true if we can use irqfds to inject interrupts into
+ * a KVM CPU (ie the kernel supports irqfds and we are running
+ * with a configuration where it is meaningful to use them).
+ */
+#define kvm_irqfds_enabled() (kvm_irqfds_allowed)
+
+/**
+ * kvm_resamplefds_enabled:
+ *
+ * Returns: true if we can use resamplefds to inject interrupts into
+ * a KVM CPU (ie the kernel supports resamplefds and we are running
+ * with a configuration where it is meaningful to use them).
+ */
+#define kvm_resamplefds_enabled() (kvm_resamplefds_allowed)
+
+/**
+ * kvm_msi_via_irqfd_enabled:
+ *
+ * Returns: true if we can route a PCI MSI (Message Signaled Interrupt)
+ * to a KVM CPU via an irqfd. This requires that the kernel supports
+ * this and that we're running in a configuration that permits it.
+ */
+#define kvm_msi_via_irqfd_enabled() (kvm_msi_via_irqfd_allowed)
+
+/**
+ * kvm_gsi_routing_enabled:
+ *
+ * Returns: true if GSI routing is enabled (ie the kernel supports
+ * it and we're running in a configuration that permits it).
+ */
+#define kvm_gsi_routing_enabled() (kvm_gsi_routing_allowed)
+
+/**
+ * kvm_gsi_direct_mapping:
+ *
+ * Returns: true if GSI direct mapping is enabled.
+ */
+#define kvm_gsi_direct_mapping() (kvm_gsi_direct_mapping)
+
+/**
+ * kvm_readonly_mem_enabled:
+ *
+ * Returns: true if KVM readonly memory is enabled (ie the kernel
+ * supports it and we're running in a configuration that permits it).
+ */
+#define kvm_readonly_mem_enabled() (kvm_readonly_mem_allowed)
+
+/**
+ * kvm_direct_msi_enabled:
+ *
+ * Returns: true if KVM allows direct MSI injection.
+ */
+#define kvm_direct_msi_enabled() (kvm_direct_msi_allowed)
+
+/**
+ * kvm_ioeventfd_any_length_enabled:
+ * Returns: true if KVM allows any length io eventfd.
+ */
+#define kvm_ioeventfd_any_length_enabled() (kvm_ioeventfd_any_length_allowed)
+
+/**
+ * kvm_msi_devid_required:
+ * Returns: true if KVM requires a device id to be provided while
+ * defining an MSI routing entry.
+ */
+#define kvm_msi_devid_required() (kvm_msi_use_devid)
+
+#else
+
+#define kvm_enabled()           (0)
+#define kvm_irqchip_in_kernel() (false)
+#define kvm_irqchip_is_split() (false)
+#define kvm_async_interrupts_enabled() (false)
+#define kvm_halt_in_kernel() (false)
+#define kvm_eventfds_enabled() (false)
+#define kvm_irqfds_enabled() (false)
+#define kvm_resamplefds_enabled() (false)
+#define kvm_msi_via_irqfd_enabled() (false)
+#define kvm_gsi_routing_allowed() (false)
+#define kvm_gsi_direct_mapping() (false)
+#define kvm_readonly_mem_enabled() (false)
+#define kvm_direct_msi_enabled() (false)
+#define kvm_ioeventfd_any_length_enabled() (false)
+#define kvm_msi_devid_required() (false)
+
+#endif  /* CONFIG_KVM_IS_POSSIBLE */
+
+struct kvm_run;
+struct kvm_lapic_state;
+struct kvm_irq_routing_entry;
+
+typedef struct KVMCapabilityInfo {
+    const char *name;
+    int value;
+} KVMCapabilityInfo;
+
+#define KVM_CAP_INFO(CAP) { "KVM_CAP_" stringify(CAP), KVM_CAP_##CAP }
+#define KVM_CAP_LAST_INFO { NULL, 0 }
+
+struct KVMState;
+
+#define TYPE_KVM_ACCEL ACCEL_CLASS_NAME("kvm")
+typedef struct KVMState KVMState;
+DECLARE_INSTANCE_CHECKER(KVMState, KVM_STATE,
+                         TYPE_KVM_ACCEL)
+
+extern KVMState *kvm_state;
+typedef struct Notifier Notifier;
+
+/* external API */
+
+bool kvm_has_free_slot(MachineState *ms);
+bool kvm_has_sync_mmu(void);
+int kvm_has_vcpu_events(void);
+int kvm_has_robust_singlestep(void);
+int kvm_has_debugregs(void);
+int kvm_max_nested_state_length(void);
+int kvm_has_pit_state2(void);
+int kvm_has_many_ioeventfds(void);
+int kvm_has_gsi_routing(void);
+int kvm_has_intx_set_mask(void);
+
+/**
+ * kvm_arm_supports_user_irq
+ *
+ * Not all KVM implementations support notifications for kernel generated
+ * interrupt events to user space. This function indicates whether the current
+ * KVM implementation does support them.
+ *
+ * Returns: true if KVM supports using kernel generated IRQs from user space
+ */
+bool kvm_arm_supports_user_irq(void);
+
+
+#ifdef NEED_CPU_H
+#include "cpu.h"
+
+void kvm_flush_coalesced_mmio_buffer(void);
+
+int kvm_insert_breakpoint(CPUState *cpu, target_ulong addr,
+                          target_ulong len, int type);
+int kvm_remove_breakpoint(CPUState *cpu, target_ulong addr,
+                          target_ulong len, int type);
+void kvm_remove_all_breakpoints(CPUState *cpu);
+int kvm_update_guest_debug(CPUState *cpu, unsigned long reinject_trap);
+
+int kvm_on_sigbus_vcpu(CPUState *cpu, int code, void *addr);
+int kvm_on_sigbus(int code, void *addr);
+
+/* internal API */
+
+int kvm_ioctl(KVMState *s, int type, ...);
+
+int kvm_vm_ioctl(KVMState *s, int type, ...);
+
+int kvm_vcpu_ioctl(CPUState *cpu, int type, ...);
+
+/**
+ * kvm_device_ioctl - call an ioctl on a kvm device
+ * @fd: The KVM device file descriptor as returned from KVM_CREATE_DEVICE
+ * @type: The device-ctrl ioctl number
+ *
+ * Returns: -errno on error, nonnegative on success
+ */
+int kvm_device_ioctl(int fd, int type, ...);
+
+/**
+ * kvm_vm_check_attr - check for existence of a specific vm attribute
+ * @s: The KVMState pointer
+ * @group: the group
+ * @attr: the attribute of that group to query for
+ *
+ * Returns: 1 if the attribute exists
+ *          0 if the attribute either does not exist or if the vm device
+ *            interface is unavailable
+ */
+int kvm_vm_check_attr(KVMState *s, uint32_t group, uint64_t attr);
+
+/**
+ * kvm_device_check_attr - check for existence of a specific device attribute
+ * @fd: The device file descriptor
+ * @group: the group
+ * @attr: the attribute of that group to query for
+ *
+ * Returns: 1 if the attribute exists
+ *          0 if the attribute either does not exist or if the vm device
+ *            interface is unavailable
+ */
+int kvm_device_check_attr(int fd, uint32_t group, uint64_t attr);
+
+/**
+ * kvm_device_access - set or get value of a specific device attribute
+ * @fd: The device file descriptor
+ * @group: the group
+ * @attr: the attribute of that group to set or get
+ * @val: pointer to a storage area for the value
+ * @write: true for set and false for get operation
+ * @errp: error object handle
+ *
+ * Returns: 0 on success
+ *          < 0 on error
+ * Use kvm_device_check_attr() in order to check for the availability
+ * of optional attributes.
+ */
+int kvm_device_access(int fd, int group, uint64_t attr,
+                      void *val, bool write, Error **errp);
+
+/**
+ * kvm_create_device - create a KVM device for the device control API
+ * @KVMState: The KVMState pointer
+ * @type: The KVM device type (see Documentation/virtual/kvm/devices in the
+ *        kernel source)
+ * @test: If true, only test if device can be created, but don't actually
+ *        create the device.
+ *
+ * Returns: -errno on error, nonnegative on success: @test ? 0 : device fd;
+ */
+int kvm_create_device(KVMState *s, uint64_t type, bool test);
+
+/**
+ * kvm_device_supported - probe whether KVM supports specific device
+ *
+ * @vmfd: The fd handler for VM
+ * @type: type of device
+ *
+ * @return: true if supported, otherwise false.
+ */
+bool kvm_device_supported(int vmfd, uint64_t type);
+
+/* Arch specific hooks */
+
+extern const KVMCapabilityInfo kvm_arch_required_capabilities[];
+
+void kvm_arch_pre_run(CPUState *cpu, struct kvm_run *run);
+MemTxAttrs kvm_arch_post_run(CPUState *cpu, struct kvm_run *run);
+
+int kvm_arch_handle_exit(CPUState *cpu, struct kvm_run *run);
+
+int kvm_arch_process_async_events(CPUState *cpu);
+
+int kvm_arch_get_registers(CPUState *cpu);
+
+/* state subset only touched by the VCPU itself during runtime */
+#define KVM_PUT_RUNTIME_STATE   1
+/* state subset modified during VCPU reset */
+#define KVM_PUT_RESET_STATE     2
+/* full state set, modified during initialization or on vmload */
+#define KVM_PUT_FULL_STATE      3
+
+int kvm_arch_put_registers(CPUState *cpu, int level);
+
+int kvm_arch_init(MachineState *ms, KVMState *s);
+
+int kvm_arch_init_vcpu(CPUState *cpu);
+int kvm_arch_destroy_vcpu(CPUState *cpu);
+
+bool kvm_vcpu_id_is_valid(int vcpu_id);
+
+/* Returns VCPU ID to be used on KVM_CREATE_VCPU ioctl() */
+unsigned long kvm_arch_vcpu_id(CPUState *cpu);
+
+#ifdef KVM_HAVE_MCE_INJECTION
+void kvm_arch_on_sigbus_vcpu(CPUState *cpu, int code, void *addr);
+#endif
+
+void kvm_arch_init_irq_routing(KVMState *s);
+
+int kvm_arch_fixup_msi_route(struct kvm_irq_routing_entry *route,
+                             uint64_t address, uint32_t data, PCIDevice *dev);
+
+/* Notify arch about newly added MSI routes */
+int kvm_arch_add_msi_route_post(struct kvm_irq_routing_entry *route,
+                                int vector, PCIDevice *dev);
+/* Notify arch about released MSI routes */
+int kvm_arch_release_virq_post(int virq);
+
+int kvm_arch_msi_data_to_gsi(uint32_t data);
+
+int kvm_set_irq(KVMState *s, int irq, int level);
+int kvm_irqchip_send_msi(KVMState *s, MSIMessage msg);
+
+void kvm_irqchip_add_irq_route(KVMState *s, int gsi, int irqchip, int pin);
+
+void kvm_irqchip_add_change_notifier(Notifier *n);
+void kvm_irqchip_remove_change_notifier(Notifier *n);
+void kvm_irqchip_change_notify(void);
+
+void kvm_get_apic_state(DeviceState *d, struct kvm_lapic_state *kapic);
+
+struct kvm_guest_debug;
+struct kvm_debug_exit_arch;
+
+struct kvm_sw_breakpoint {
+    target_ulong pc;
+    target_ulong saved_insn;
+    int use_count;
+    QTAILQ_ENTRY(kvm_sw_breakpoint) entry;
+};
+
+struct kvm_sw_breakpoint *kvm_find_sw_breakpoint(CPUState *cpu,
+                                                 target_ulong pc);
+
+int kvm_sw_breakpoints_active(CPUState *cpu);
+
+int kvm_arch_insert_sw_breakpoint(CPUState *cpu,
+                                  struct kvm_sw_breakpoint *bp);
+int kvm_arch_remove_sw_breakpoint(CPUState *cpu,
+                                  struct kvm_sw_breakpoint *bp);
+int kvm_arch_insert_hw_breakpoint(target_ulong addr,
+                                  target_ulong len, int type);
+int kvm_arch_remove_hw_breakpoint(target_ulong addr,
+                                  target_ulong len, int type);
+void kvm_arch_remove_all_hw_breakpoints(void);
+
+void kvm_arch_update_guest_debug(CPUState *cpu, struct kvm_guest_debug *dbg);
+
+bool kvm_arch_stop_on_emulation_error(CPUState *cpu);
+
+int kvm_check_extension(KVMState *s, unsigned int extension);
+
+int kvm_vm_check_extension(KVMState *s, unsigned int extension);
+
+#define kvm_vm_enable_cap(s, capability, cap_flags, ...)             \
+    ({                                                               \
+        struct kvm_enable_cap cap = {                                \
+            .cap = capability,                                       \
+            .flags = cap_flags,                                      \
+        };                                                           \
+        uint64_t args_tmp[] = { __VA_ARGS__ };                       \
+        size_t n = MIN(ARRAY_SIZE(args_tmp), ARRAY_SIZE(cap.args));  \
+        memcpy(cap.args, args_tmp, n * sizeof(cap.args[0]));         \
+        kvm_vm_ioctl(s, KVM_ENABLE_CAP, &cap);                       \
+    })
+
+#define kvm_vcpu_enable_cap(cpu, capability, cap_flags, ...)         \
+    ({                                                               \
+        struct kvm_enable_cap cap = {                                \
+            .cap = capability,                                       \
+            .flags = cap_flags,                                      \
+        };                                                           \
+        uint64_t args_tmp[] = { __VA_ARGS__ };                       \
+        size_t n = MIN(ARRAY_SIZE(args_tmp), ARRAY_SIZE(cap.args));  \
+        memcpy(cap.args, args_tmp, n * sizeof(cap.args[0]));         \
+        kvm_vcpu_ioctl(cpu, KVM_ENABLE_CAP, &cap);                   \
+    })
+
+uint32_t kvm_arch_get_supported_cpuid(KVMState *env, uint32_t function,
+                                      uint32_t index, int reg);
+uint64_t kvm_arch_get_supported_msr_feature(KVMState *s, uint32_t index);
+
+
+void kvm_set_sigmask_len(KVMState *s, unsigned int sigmask_len);
+
+#if !defined(CONFIG_USER_ONLY)
+int kvm_physical_memory_addr_from_host(KVMState *s, void *ram_addr,
+                                       hwaddr *phys_addr);
+#endif
+
+#endif /* NEED_CPU_H */
+
+void kvm_cpu_synchronize_state(CPUState *cpu);
+
+void kvm_init_cpu_signals(CPUState *cpu);
+
+/**
+ * kvm_irqchip_add_msi_route - Add MSI route for specific vector
+ * @s:      KVM state
+ * @vector: which vector to add. This can be either MSI/MSIX
+ *          vector. The function will automatically detect whether
+ *          MSI/MSIX is enabled, and fetch corresponding MSI
+ *          message.
+ * @dev:    Owner PCI device to add the route. If @dev is specified
+ *          as @NULL, an empty MSI message will be inited.
+ * @return: virq (>=0) when success, errno (<0) when failed.
+ */
+int kvm_irqchip_add_msi_route(KVMState *s, int vector, PCIDevice *dev);
+int kvm_irqchip_update_msi_route(KVMState *s, int virq, MSIMessage msg,
+                                 PCIDevice *dev);
+void kvm_irqchip_commit_routes(KVMState *s);
+void kvm_irqchip_release_virq(KVMState *s, int virq);
+
+int kvm_irqchip_add_adapter_route(KVMState *s, AdapterInfo *adapter);
+int kvm_irqchip_add_hv_sint_route(KVMState *s, uint32_t vcpu, uint32_t sint);
+
+int kvm_irqchip_add_irqfd_notifier_gsi(KVMState *s, EventNotifier *n,
+                                       EventNotifier *rn, int virq);
+int kvm_irqchip_remove_irqfd_notifier_gsi(KVMState *s, EventNotifier *n,
+                                          int virq);
+int kvm_irqchip_add_irqfd_notifier(KVMState *s, EventNotifier *n,
+                                   EventNotifier *rn, qemu_irq irq);
+int kvm_irqchip_remove_irqfd_notifier(KVMState *s, EventNotifier *n,
+                                      qemu_irq irq);
+void kvm_irqchip_set_qemuirq_gsi(KVMState *s, qemu_irq irq, int gsi);
+void kvm_pc_setup_irq_routing(bool pci_enabled);
+void kvm_init_irq_routing(KVMState *s);
+
+bool kvm_kernel_irqchip_allowed(void);
+bool kvm_kernel_irqchip_required(void);
+bool kvm_kernel_irqchip_split(void);
+
+/**
+ * kvm_arch_irqchip_create:
+ * @KVMState: The KVMState pointer
+ *
+ * Allow architectures to create an in-kernel irq chip themselves.
+ *
+ * Returns: < 0: error
+ *            0: irq chip was not created
+ *          > 0: irq chip was created
+ */
+int kvm_arch_irqchip_create(KVMState *s);
+
+/**
+ * kvm_set_one_reg - set a register value in KVM via KVM_SET_ONE_REG ioctl
+ * @id: The register ID
+ * @source: The pointer to the value to be set. It must point to a variable
+ *          of the correct type/size for the register being accessed.
+ *
+ * Returns: 0 on success, or a negative errno on failure.
+ */
+int kvm_set_one_reg(CPUState *cs, uint64_t id, void *source);
+
+/**
+ * kvm_get_one_reg - get a register value from KVM via KVM_GET_ONE_REG ioctl
+ * @id: The register ID
+ * @target: The pointer where the value is to be stored. It must point to a
+ *          variable of the correct type/size for the register being accessed.
+ *
+ * Returns: 0 on success, or a negative errno on failure.
+ */
+int kvm_get_one_reg(CPUState *cs, uint64_t id, void *target);
+struct ppc_radix_page_info *kvm_get_radix_page_info(void);
+int kvm_get_max_memslots(void);
+
+/* Notify resamplefd for EOI of specific interrupts. */
+void kvm_resample_fd_notify(int gsi);
+
+/**
+ * kvm_cpu_check_are_resettable - return whether CPUs can be reset
+ *
+ * Returns: true: CPUs are resettable
+ *          false: CPUs are not resettable
+ */
+bool kvm_cpu_check_are_resettable(void);
+
+bool kvm_arch_cpu_check_are_resettable(void);
+
+bool kvm_dirty_ring_enabled(void);
+#endif