qemu-e2k/target/arm/kvm_arm.h

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/*
* QEMU KVM support -- ARM specific functions.
*
* Copyright (c) 2012 Linaro Limited
*
* 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_ARM_H
#define QEMU_KVM_ARM_H
#include "sysemu/kvm.h"
#include "exec/memory.h"
#include "qemu/error-report.h"
/**
* kvm_arm_vcpu_init:
* @cs: CPUState
*
* Initialize (or reinitialize) the VCPU by invoking the
* KVM_ARM_VCPU_INIT ioctl with the CPU type and feature
* bitmask specified in the CPUState.
*
* Returns: 0 if success else < 0 error code
*/
int kvm_arm_vcpu_init(CPUState *cs);
/**
* kvm_arm_register_device:
* @mr: memory region for this device
* @devid: the KVM device ID
* @group: device control API group for setting addresses
* @attr: device control API address type
* @dev_fd: device control device file descriptor (or -1 if not supported)
*
* Remember the memory region @mr, and when it is mapped by the
* machine model, tell the kernel that base address using the
* KVM_ARM_SET_DEVICE_ADDRESS ioctl or the newer device control API. @devid
* should be the ID of the device as defined by KVM_ARM_SET_DEVICE_ADDRESS or
* the arm-vgic device in the device control API.
* The machine model may map
* and unmap the device multiple times; the kernel will only be told the final
* address at the point where machine init is complete.
*/
void kvm_arm_register_device(MemoryRegion *mr, uint64_t devid, uint64_t group,
uint64_t attr, int dev_fd);
/**
* kvm_arm_init_cpreg_list:
* @cs: CPUState
*
* Initialize the CPUState's cpreg list according to the kernel's
* definition of what CPU registers it knows about (and throw away
* the previous TCG-created cpreg list).
*
* Returns: 0 if success, else < 0 error code
*/
int kvm_arm_init_cpreg_list(ARMCPU *cpu);
/**
* kvm_arm_reg_syncs_via_cpreg_list
* regidx: KVM register index
*
* Return true if this KVM register should be synchronized via the
* cpreg list of arbitrary system registers, false if it is synchronized
* by hand using code in kvm_arch_get/put_registers().
*/
bool kvm_arm_reg_syncs_via_cpreg_list(uint64_t regidx);
/**
* kvm_arm_cpreg_level
* regidx: KVM register index
*
* Return the level of this coprocessor/system register. Return value is
* either KVM_PUT_RUNTIME_STATE, KVM_PUT_RESET_STATE, or KVM_PUT_FULL_STATE.
*/
int kvm_arm_cpreg_level(uint64_t regidx);
/**
* write_list_to_kvmstate:
* @cpu: ARMCPU
* @level: the state level to sync
*
* For each register listed in the ARMCPU cpreg_indexes list, write
* its value from the cpreg_values list into the kernel (via ioctl).
* This updates KVM's working data structures from TCG data or
* from incoming migration state.
*
* Returns: true if all register values were updated correctly,
* false if some register was unknown to the kernel or could not
* be written (eg constant register with the wrong value).
* Note that we do not stop early on failure -- we will attempt
* writing all registers in the list.
*/
bool write_list_to_kvmstate(ARMCPU *cpu, int level);
/**
* write_kvmstate_to_list:
* @cpu: ARMCPU
*
* For each register listed in the ARMCPU cpreg_indexes list, write
* its value from the kernel into the cpreg_values list. This is used to
* copy info from KVM's working data structures into TCG or
* for outbound migration.
*
* Returns: true if all register values were read correctly,
* false if some register was unknown or could not be read.
* Note that we do not stop early on failure -- we will attempt
* reading all registers in the list.
*/
bool write_kvmstate_to_list(ARMCPU *cpu);
/**
* kvm_arm_reset_vcpu:
* @cpu: ARMCPU
*
* Called at reset time to kernel registers to their initial values.
*/
void kvm_arm_reset_vcpu(ARMCPU *cpu);
#ifdef CONFIG_KVM
/**
* kvm_arm_create_scratch_host_vcpu:
* @cpus_to_try: array of QEMU_KVM_ARM_TARGET_* values (terminated with
* QEMU_KVM_ARM_TARGET_NONE) to try as fallback if the kernel does not
* know the PREFERRED_TARGET ioctl. Passing NULL is the same as passing
* an empty array.
* @fdarray: filled in with kvmfd, vmfd, cpufd file descriptors in that order
* @init: filled in with the necessary values for creating a host
* vcpu. If NULL is provided, will not init the vCPU (though the cpufd
* will still be set up).
*
* Create a scratch vcpu in its own VM of the type preferred by the host
* kernel (as would be used for '-cpu host'), for purposes of probing it
* for capabilities.
*
* Returns: true on success (and fdarray and init are filled in),
* false on failure (and fdarray and init are not valid).
*/
bool kvm_arm_create_scratch_host_vcpu(const uint32_t *cpus_to_try,
int *fdarray,
struct kvm_vcpu_init *init);
/**
* kvm_arm_destroy_scratch_host_vcpu:
* @fdarray: array of fds as set up by kvm_arm_create_scratch_host_vcpu
*
* Tear down the scratch vcpu created by kvm_arm_create_scratch_host_vcpu.
*/
void kvm_arm_destroy_scratch_host_vcpu(int *fdarray);
#define TYPE_ARM_HOST_CPU "host-" TYPE_ARM_CPU
target/arm: Query host CPU features on-demand at instance init Currently we query the host CPU features in the class init function for the TYPE_ARM_HOST_CPU class, so that we can later copy them from the class object into the instance object in the object instance init function. This is awkward for implementing "-cpu max", which should work like "-cpu host" for KVM but like "cpu with all implemented features" for TCG. Move the place where we store the information about the host CPU from a class object to static variables in kvm.c, and then in the instance init function call a new kvm_arm_set_cpu_features_from_host() function which will query the host kernel if necessary and then fill in the CPU instance fields. This allows us to drop the special class struct and class init function for TYPE_ARM_HOST_CPU entirely. We can't delay the probe until realize, because the ARM instance_post_init hook needs to look at the feature bits we set, so we need to do it in the initfn. This is safe because the probing doesn't affect the actual VM state (it creates a separate scratch VM to do its testing), but the probe might fail. Because we can't report errors in retrieving the host features in the initfn, we check this belatedly in the realize function (the intervening code will be able to cope with the relevant fields in the CPU structure being zero). Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Message-id: 20180308130626.12393-2-peter.maydell@linaro.org
2018-03-09 18:09:44 +01:00
/**
* ARMHostCPUFeatures: information about the host CPU (identified
* by asking the host kernel)
*/
typedef struct ARMHostCPUFeatures {
uint64_t features;
uint32_t target;
const char *dtb_compatible;
target/arm: Query host CPU features on-demand at instance init Currently we query the host CPU features in the class init function for the TYPE_ARM_HOST_CPU class, so that we can later copy them from the class object into the instance object in the object instance init function. This is awkward for implementing "-cpu max", which should work like "-cpu host" for KVM but like "cpu with all implemented features" for TCG. Move the place where we store the information about the host CPU from a class object to static variables in kvm.c, and then in the instance init function call a new kvm_arm_set_cpu_features_from_host() function which will query the host kernel if necessary and then fill in the CPU instance fields. This allows us to drop the special class struct and class init function for TYPE_ARM_HOST_CPU entirely. We can't delay the probe until realize, because the ARM instance_post_init hook needs to look at the feature bits we set, so we need to do it in the initfn. This is safe because the probing doesn't affect the actual VM state (it creates a separate scratch VM to do its testing), but the probe might fail. Because we can't report errors in retrieving the host features in the initfn, we check this belatedly in the realize function (the intervening code will be able to cope with the relevant fields in the CPU structure being zero). Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Message-id: 20180308130626.12393-2-peter.maydell@linaro.org
2018-03-09 18:09:44 +01:00
} ARMHostCPUFeatures;
/**
* kvm_arm_get_host_cpu_features:
* @ahcc: ARMHostCPUClass to fill in
*
* Probe the capabilities of the host kernel's preferred CPU and fill
* in the ARMHostCPUClass struct accordingly.
*/
target/arm: Query host CPU features on-demand at instance init Currently we query the host CPU features in the class init function for the TYPE_ARM_HOST_CPU class, so that we can later copy them from the class object into the instance object in the object instance init function. This is awkward for implementing "-cpu max", which should work like "-cpu host" for KVM but like "cpu with all implemented features" for TCG. Move the place where we store the information about the host CPU from a class object to static variables in kvm.c, and then in the instance init function call a new kvm_arm_set_cpu_features_from_host() function which will query the host kernel if necessary and then fill in the CPU instance fields. This allows us to drop the special class struct and class init function for TYPE_ARM_HOST_CPU entirely. We can't delay the probe until realize, because the ARM instance_post_init hook needs to look at the feature bits we set, so we need to do it in the initfn. This is safe because the probing doesn't affect the actual VM state (it creates a separate scratch VM to do its testing), but the probe might fail. Because we can't report errors in retrieving the host features in the initfn, we check this belatedly in the realize function (the intervening code will be able to cope with the relevant fields in the CPU structure being zero). Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Message-id: 20180308130626.12393-2-peter.maydell@linaro.org
2018-03-09 18:09:44 +01:00
bool kvm_arm_get_host_cpu_features(ARMHostCPUFeatures *ahcf);
target/arm: Query host CPU features on-demand at instance init Currently we query the host CPU features in the class init function for the TYPE_ARM_HOST_CPU class, so that we can later copy them from the class object into the instance object in the object instance init function. This is awkward for implementing "-cpu max", which should work like "-cpu host" for KVM but like "cpu with all implemented features" for TCG. Move the place where we store the information about the host CPU from a class object to static variables in kvm.c, and then in the instance init function call a new kvm_arm_set_cpu_features_from_host() function which will query the host kernel if necessary and then fill in the CPU instance fields. This allows us to drop the special class struct and class init function for TYPE_ARM_HOST_CPU entirely. We can't delay the probe until realize, because the ARM instance_post_init hook needs to look at the feature bits we set, so we need to do it in the initfn. This is safe because the probing doesn't affect the actual VM state (it creates a separate scratch VM to do its testing), but the probe might fail. Because we can't report errors in retrieving the host features in the initfn, we check this belatedly in the realize function (the intervening code will be able to cope with the relevant fields in the CPU structure being zero). Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Message-id: 20180308130626.12393-2-peter.maydell@linaro.org
2018-03-09 18:09:44 +01:00
/**
* kvm_arm_set_cpu_features_from_host:
* @cpu: ARMCPU to set the features for
*
* Set up the ARMCPU struct fields up to match the information probed
* from the host CPU.
*/
void kvm_arm_set_cpu_features_from_host(ARMCPU *cpu);
/**
* kvm_arm_sync_mpstate_to_kvm
* @cpu: ARMCPU
*
* If supported set the KVM MP_STATE based on QEMU's model.
*/
int kvm_arm_sync_mpstate_to_kvm(ARMCPU *cpu);
/**
* kvm_arm_sync_mpstate_to_qemu
* @cpu: ARMCPU
*
* If supported get the MP_STATE from KVM and store in QEMU's model.
*/
int kvm_arm_sync_mpstate_to_qemu(ARMCPU *cpu);
int kvm_arm_vgic_probe(void);
void kvm_arm_pmu_set_irq(CPUState *cs, int irq);
void kvm_arm_pmu_init(CPUState *cs);
#else
target/arm: Query host CPU features on-demand at instance init Currently we query the host CPU features in the class init function for the TYPE_ARM_HOST_CPU class, so that we can later copy them from the class object into the instance object in the object instance init function. This is awkward for implementing "-cpu max", which should work like "-cpu host" for KVM but like "cpu with all implemented features" for TCG. Move the place where we store the information about the host CPU from a class object to static variables in kvm.c, and then in the instance init function call a new kvm_arm_set_cpu_features_from_host() function which will query the host kernel if necessary and then fill in the CPU instance fields. This allows us to drop the special class struct and class init function for TYPE_ARM_HOST_CPU entirely. We can't delay the probe until realize, because the ARM instance_post_init hook needs to look at the feature bits we set, so we need to do it in the initfn. This is safe because the probing doesn't affect the actual VM state (it creates a separate scratch VM to do its testing), but the probe might fail. Because we can't report errors in retrieving the host features in the initfn, we check this belatedly in the realize function (the intervening code will be able to cope with the relevant fields in the CPU structure being zero). Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Message-id: 20180308130626.12393-2-peter.maydell@linaro.org
2018-03-09 18:09:44 +01:00
static inline void kvm_arm_set_cpu_features_from_host(ARMCPU *cpu)
{
/* This should never actually be called in the "not KVM" case,
* but set up the fields to indicate an error anyway.
*/
cpu->kvm_target = QEMU_KVM_ARM_TARGET_NONE;
cpu->host_cpu_probe_failed = true;
}
static inline int kvm_arm_vgic_probe(void)
{
return 0;
}
static inline void kvm_arm_pmu_set_irq(CPUState *cs, int irq) {}
static inline void kvm_arm_pmu_init(CPUState *cs) {}
#endif
static inline const char *gic_class_name(void)
{
return kvm_irqchip_in_kernel() ? "kvm-arm-gic" : "arm_gic";
}
/**
* gicv3_class_name
*
* Return name of GICv3 class to use depending on whether KVM acceleration is
* in use. May throw an error if the chosen implementation is not available.
*
* Returns: class name to use
*/
static inline const char *gicv3_class_name(void)
{
if (kvm_irqchip_in_kernel()) {
#ifdef TARGET_AARCH64
return "kvm-arm-gicv3";
#else
error_report("KVM GICv3 acceleration is not supported on this "
"platform");
exit(1);
#endif
} else {
if (kvm_enabled()) {
error_report("Userspace GICv3 is not supported with KVM");
exit(1);
}
return "arm-gicv3";
}
}
/**
* kvm_arm_handle_debug:
* @cs: CPUState
* @debug_exit: debug part of the KVM exit structure
*
* Returns: TRUE if the debug exception was handled.
*/
bool kvm_arm_handle_debug(CPUState *cs, struct kvm_debug_exit_arch *debug_exit);
/**
* kvm_arm_hw_debug_active:
* @cs: CPU State
*
* Return: TRUE if any hardware breakpoints in use.
*/
bool kvm_arm_hw_debug_active(CPUState *cs);
/**
* kvm_arm_copy_hw_debug_data:
*
* @ptr: kvm_guest_debug_arch structure
*
* Copy the architecture specific debug registers into the
* kvm_guest_debug ioctl structure.
*/
struct kvm_guest_debug_arch;
void kvm_arm_copy_hw_debug_data(struct kvm_guest_debug_arch *ptr);
/**
* its_class_name
*
* Return the ITS class name to use depending on whether KVM acceleration
* and KVM CAP_SIGNAL_MSI are supported
*
* Returns: class name to use or NULL
*/
static inline const char *its_class_name(void)
{
if (kvm_irqchip_in_kernel()) {
/* KVM implementation requires this capability */
return kvm_direct_msi_enabled() ? "arm-its-kvm" : NULL;
} else {
/* Software emulation is not implemented yet */
return NULL;
}
}
#endif