qemu/target/i386/hvf/hvf-cpu.c
David Edmondson fea4500841 target/i386: Populate x86_ext_save_areas offsets using cpuid where possible
Rather than relying on the X86XSaveArea structure definition,
determine the offset of XSAVE state areas using CPUID leaf 0xd where
possible (KVM and HVF).

Signed-off-by: David Edmondson <david.edmondson@oracle.com>
Message-Id: <20210705104632.2902400-8-david.edmondson@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2021-07-06 08:33:48 +02:00

98 lines
2.3 KiB
C

/*
* x86 HVF CPU type initialization
*
* Copyright 2021 SUSE LLC
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "cpu.h"
#include "host-cpu.h"
#include "qapi/error.h"
#include "sysemu/sysemu.h"
#include "hw/boards.h"
#include "sysemu/hvf.h"
#include "hw/core/accel-cpu.h"
static void hvf_cpu_max_instance_init(X86CPU *cpu)
{
CPUX86State *env = &cpu->env;
host_cpu_max_instance_init(cpu);
env->cpuid_min_level =
hvf_get_supported_cpuid(0x0, 0, R_EAX);
env->cpuid_min_xlevel =
hvf_get_supported_cpuid(0x80000000, 0, R_EAX);
env->cpuid_min_xlevel2 =
hvf_get_supported_cpuid(0xC0000000, 0, R_EAX);
}
static void hvf_cpu_xsave_init(void)
{
static bool first = true;
int i;
if (!first) {
return;
}
first = false;
/* x87 and SSE states are in the legacy region of the XSAVE area. */
x86_ext_save_areas[XSTATE_FP_BIT].offset = 0;
x86_ext_save_areas[XSTATE_SSE_BIT].offset = 0;
for (i = XSTATE_SSE_BIT + 1; i < XSAVE_STATE_AREA_COUNT; i++) {
ExtSaveArea *esa = &x86_ext_save_areas[i];
if (esa->size) {
int sz = hvf_get_supported_cpuid(0xd, i, R_EAX);
if (sz != 0) {
assert(esa->size == sz);
esa->offset = hvf_get_supported_cpuid(0xd, i, R_EBX);
}
}
}
}
static void hvf_cpu_instance_init(CPUState *cs)
{
X86CPU *cpu = X86_CPU(cs);
host_cpu_instance_init(cpu);
/* Special cases not set in the X86CPUDefinition structs: */
/* TODO: in-kernel irqchip for hvf */
if (cpu->max_features) {
hvf_cpu_max_instance_init(cpu);
}
hvf_cpu_xsave_init();
}
static void hvf_cpu_accel_class_init(ObjectClass *oc, void *data)
{
AccelCPUClass *acc = ACCEL_CPU_CLASS(oc);
acc->cpu_realizefn = host_cpu_realizefn;
acc->cpu_instance_init = hvf_cpu_instance_init;
}
static const TypeInfo hvf_cpu_accel_type_info = {
.name = ACCEL_CPU_NAME("hvf"),
.parent = TYPE_ACCEL_CPU,
.class_init = hvf_cpu_accel_class_init,
.abstract = true,
};
static void hvf_cpu_accel_register_types(void)
{
type_register_static(&hvf_cpu_accel_type_info);
}
type_init(hvf_cpu_accel_register_types);