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target/i386/mshv: Implement mshv_store_regs()

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Add support for writing general-purpose registers to MSHV vCPUs
during initialization or migration using the MSHV register interface. A
generic set_register call is introduced to abstract the HV call over
the various register types.

Signed-off-by: Magnus Kulke <magnuskulke@linux.microsoft.com>
Link: https://lore.kernel.org/r/20250916164847.77883-14-magnuskulke@linux.microsoft.com
[mshv.h/mshv_int.h split. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Magnus Kulke
2025-10-08 19:17:30 +02:00
committed by Paolo Bonzini
parent 4ed605c06e
commit 2bd7a6aa47
3 changed files with 117 additions and 2 deletions
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include/system/mshv.h
+1
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@@ -18,6 +18,7 @@
#include "qemu/accel.h"
#include "hw/hyperv/hyperv-proto.h"
#include "hw/hyperv/hvhdk.h"
#include "hw/hyperv/hvgdk_mini.h"
#include "qapi/qapi-types-common.h"
#include "system/memory.h"
#include "accel/accel-ops.h"
include/system/mshv_int.h
+2
View File
@@ -61,6 +61,8 @@ void mshv_remove_vcpu(int vm_fd, int cpu_fd);
int mshv_run_vcpu(int vm_fd, CPUState *cpu, hv_message *msg, MshvVmExit *exit);
int mshv_load_regs(CPUState *cpu);
int mshv_store_regs(CPUState *cpu);
int mshv_set_generic_regs(const CPUState *cpu, const hv_register_assoc *assocs,
size_t n_regs);
int mshv_arch_put_registers(const CPUState *cpu);
void mshv_arch_init_vcpu(CPUState *cpu);
void mshv_arch_destroy_vcpu(CPUState *cpu);
target/i386/mshv/mshv-cpu.c
+114 -2
View File
@@ -32,12 +32,124 @@
#include <sys/ioctl.h>
static enum hv_register_name STANDARD_REGISTER_NAMES[18] = {
HV_X64_REGISTER_RAX,
HV_X64_REGISTER_RBX,
HV_X64_REGISTER_RCX,
HV_X64_REGISTER_RDX,
HV_X64_REGISTER_RSI,
HV_X64_REGISTER_RDI,
HV_X64_REGISTER_RSP,
HV_X64_REGISTER_RBP,
HV_X64_REGISTER_R8,
HV_X64_REGISTER_R9,
HV_X64_REGISTER_R10,
HV_X64_REGISTER_R11,
HV_X64_REGISTER_R12,
HV_X64_REGISTER_R13,
HV_X64_REGISTER_R14,
HV_X64_REGISTER_R15,
HV_X64_REGISTER_RIP,
HV_X64_REGISTER_RFLAGS,
};
int mshv_set_generic_regs(const CPUState *cpu, const hv_register_assoc *assocs,
size_t n_regs)
{
int cpu_fd = mshv_vcpufd(cpu);
int vp_index = cpu->cpu_index;
size_t in_sz, assocs_sz;
hv_input_set_vp_registers *in;
struct mshv_root_hvcall args = {0};
int ret;
/* find out the size of the struct w/ a flexible array at the tail */
assocs_sz = n_regs * sizeof(hv_register_assoc);
in_sz = sizeof(hv_input_set_vp_registers) + assocs_sz;
/* fill the input struct */
in = g_malloc0(in_sz);
in->vp_index = vp_index;
memcpy(in->elements, assocs, assocs_sz);
/* create the hvcall envelope */
args.code = HVCALL_SET_VP_REGISTERS;
args.in_sz = in_sz;
args.in_ptr = (uint64_t) in;
args.reps = (uint16_t) n_regs;
/* perform the call */
ret = mshv_hvcall(cpu_fd, &args);
g_free(in);
if (ret < 0) {
error_report("Failed to set registers");
return -1;
}
/* assert we set all registers */
if (args.reps != n_regs) {
error_report("Failed to set registers: expected %zu elements"
", got %u", n_regs, args.reps);
return -1;
}
return 0;
}
static int set_standard_regs(const CPUState *cpu)
{
X86CPU *x86cpu = X86_CPU(cpu);
CPUX86State *env = &x86cpu->env;
hv_register_assoc assocs[ARRAY_SIZE(STANDARD_REGISTER_NAMES)];
int ret;
size_t n_regs = ARRAY_SIZE(STANDARD_REGISTER_NAMES);
/* set names */
for (size_t i = 0; i < ARRAY_SIZE(STANDARD_REGISTER_NAMES); i++) {
assocs[i].name = STANDARD_REGISTER_NAMES[i];
}
assocs[0].value.reg64 = env->regs[R_EAX];
assocs[1].value.reg64 = env->regs[R_EBX];
assocs[2].value.reg64 = env->regs[R_ECX];
assocs[3].value.reg64 = env->regs[R_EDX];
assocs[4].value.reg64 = env->regs[R_ESI];
assocs[5].value.reg64 = env->regs[R_EDI];
assocs[6].value.reg64 = env->regs[R_ESP];
assocs[7].value.reg64 = env->regs[R_EBP];
assocs[8].value.reg64 = env->regs[R_R8];
assocs[9].value.reg64 = env->regs[R_R9];
assocs[10].value.reg64 = env->regs[R_R10];
assocs[11].value.reg64 = env->regs[R_R11];
assocs[12].value.reg64 = env->regs[R_R12];
assocs[13].value.reg64 = env->regs[R_R13];
assocs[14].value.reg64 = env->regs[R_R14];
assocs[15].value.reg64 = env->regs[R_R15];
assocs[16].value.reg64 = env->eip;
lflags_to_rflags(env);
assocs[17].value.reg64 = env->eflags;
ret = mshv_set_generic_regs(cpu, assocs, n_regs);
if (ret < 0) {
error_report("failed to set standard registers");
return -errno;
}
return 0;
}
int mshv_store_regs(CPUState *cpu)
{
error_report("unimplemented");
abort();
int ret;
ret = set_standard_regs(cpu);
if (ret < 0) {
error_report("Failed to store standard registers");
return -1;
}
return 0;
}
int mshv_load_regs(CPUState *cpu)
{
error_report("unimplemented");