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ARM KVM: save and load VFP registers from kernel

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Add support for saving and restoring VFP register state from the
kernel. This includes a check that the KVM-created CPU has full
VFP support (as the TCG Cortex-A15 model always does), since for
the moment ARM QEMU doesn't have any way to tweak optional features
on created CPUs.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Peter Maydell 2013-03-05 00:34:41 +00:00
parent 494b00c76a
commit 81635574f6
1 changed files with 75 additions and 3 deletions
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78
target-arm/kvm.c
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@ -43,10 +43,28 @@ unsigned long kvm_arch_vcpu_id(CPUState *cpu)
int kvm_arch_init_vcpu(CPUState *cs)
{
struct kvm_vcpu_init init;
int ret;
uint64_t v;
struct kvm_one_reg r;
init.target = KVM_ARM_TARGET_CORTEX_A15;
memset(init.features, 0, sizeof(init.features));
return kvm_vcpu_ioctl(cs, KVM_ARM_VCPU_INIT, &init);
ret = kvm_vcpu_ioctl(cs, KVM_ARM_VCPU_INIT, &init);
if (ret) {
return ret;
}
/* Query the kernel to make sure it supports 32 VFP
* registers: QEMU's "cortex-a15" CPU is always a
* VFP-D32 core. The simplest way to do this is just
* to attempt to read register d31.
*/
r.id = KVM_REG_ARM | KVM_REG_SIZE_U64 | KVM_REG_ARM_VFP | 31;
r.addr = (uintptr_t)(&v);
ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &r);
if (ret == ENOENT) {
return EINVAL;
}
return ret;
}
typedef struct Reg {
@ -72,6 +90,13 @@ typedef struct Reg {
offsetof(CPUARMState, QEMUFIELD) \
}
#define VFPSYSREG(R) \
{ \
KVM_REG_ARM | KVM_REG_SIZE_U32 | KVM_REG_ARM_VFP | \
KVM_REG_ARM_VFP_##R, \
offsetof(CPUARMState, vfp.xregs[ARM_VFP_##R]) \
}
static const Reg regs[] = {
/* R0_usr .. R14_usr */
COREREG(usr_regs.uregs[0], regs[0]),
@ -119,6 +144,13 @@ static const Reg regs[] = {
CP15REG(1, 0, 0, 0, cp15.c1_sys), /* SCTLR */
CP15REG(2, 0, 0, 2, cp15.c2_control), /* TTBCR */
CP15REG(3, 0, 0, 0, cp15.c3), /* DACR */
/* VFP system registers */
VFPSYSREG(FPSID),
VFPSYSREG(MVFR1),
VFPSYSREG(MVFR0),
VFPSYSREG(FPEXC),
VFPSYSREG(FPINST),
VFPSYSREG(FPINST2),
};
int kvm_arch_put_registers(CPUState *cs, int level)
@ -128,7 +160,7 @@ int kvm_arch_put_registers(CPUState *cs, int level)
struct kvm_one_reg r;
int mode, bn;
int ret, i;
uint32_t cpsr;
uint32_t cpsr, fpscr;
uint64_t ttbr;
/* Make sure the banked regs are properly set */
@ -179,6 +211,26 @@ int kvm_arch_put_registers(CPUState *cs, int level)
(2 << KVM_REG_ARM_CRM_SHIFT) | (1 << KVM_REG_ARM_OPC1_SHIFT);
r.addr = (uintptr_t)(&ttbr);
ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &r);
if (ret) {
return ret;
}
/* VFP registers */
r.id = KVM_REG_ARM | KVM_REG_SIZE_U64 | KVM_REG_ARM_VFP;
for (i = 0; i < 32; i++) {
r.addr = (uintptr_t)(&env->vfp.regs[i]);
ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &r);
if (ret) {
return ret;
}
r.id++;
}
r.id = KVM_REG_ARM | KVM_REG_SIZE_U32 | KVM_REG_ARM_VFP |
KVM_REG_ARM_VFP_FPSCR;
fpscr = vfp_get_fpscr(env);
r.addr = (uintptr_t)&fpscr;
ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &r);
return ret;
}
@ -190,7 +242,7 @@ int kvm_arch_get_registers(CPUState *cs)
struct kvm_one_reg r;
int mode, bn;
int ret, i;
uint32_t cpsr;
uint32_t cpsr, fpscr;
uint64_t ttbr;
for (i = 0; i < ARRAY_SIZE(regs); i++) {
@ -255,6 +307,26 @@ int kvm_arch_get_registers(CPUState *cs)
env->cp15.c2_mask = ~(0xffffffffu >> env->cp15.c2_control);
env->cp15.c2_base_mask = ~(0x3fffu >> env->cp15.c2_control);
/* VFP registers */
r.id = KVM_REG_ARM | KVM_REG_SIZE_U64 | KVM_REG_ARM_VFP;
for (i = 0; i < 32; i++) {
r.addr = (uintptr_t)(&env->vfp.regs[i]);
ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &r);
if (ret) {
return ret;
}
r.id++;
}
r.id = KVM_REG_ARM | KVM_REG_SIZE_U32 | KVM_REG_ARM_VFP |
KVM_REG_ARM_VFP_FPSCR;
r.addr = (uintptr_t)&fpscr;
ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &r);
if (ret) {
return ret;
}
vfp_set_fpscr(env, fpscr);
return 0;
}