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ARM: KVM: Move VFP registers to a CPU context structure

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In order to turn the WS code into something that looks a bit
more like the arm64 version, move the VFP registers into a
CPU context container for both the host and the guest.

Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Marc Zyngier 2016-01-03 11:01:49 +00:00
parent 42428525a9
commit 0ca5565df8
4 changed files with 26 additions and 20 deletions
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11
arch/arm/include/asm/kvm_host.h
View File

@ -88,9 +88,15 @@ struct kvm_vcpu_fault_info {
u32 hyp_pc; /* PC when exception was taken from Hyp mode */
};
typedef struct vfp_hard_struct kvm_cpu_context_t;
struct kvm_cpu_context {
struct vfp_hard_struct vfp;
};
typedef struct kvm_cpu_context kvm_cpu_context_t;
struct kvm_vcpu_arch {
struct kvm_cpu_context ctxt;
struct kvm_regs regs;
int target; /* Processor target */
@ -111,9 +117,6 @@ struct kvm_vcpu_arch {
/* Exception Information */
struct kvm_vcpu_fault_info fault;
/* Floating point registers (VFP and Advanced SIMD/NEON) */
struct vfp_hard_struct vfp_guest;
/* Host FP context */
kvm_cpu_context_t *host_cpu_context;

5
arch/arm/kernel/asm-offsets.c
View File

@ -173,8 +173,9 @@ int main(void)
DEFINE(VCPU_KVM, offsetof(struct kvm_vcpu, kvm));
DEFINE(VCPU_MIDR, offsetof(struct kvm_vcpu, arch.midr));
DEFINE(VCPU_CP15, offsetof(struct kvm_vcpu, arch.cp15));
DEFINE(VCPU_VFP_GUEST, offsetof(struct kvm_vcpu, arch.vfp_guest));
DEFINE(VCPU_VFP_HOST, offsetof(struct kvm_vcpu, arch.host_cpu_context));
DEFINE(VCPU_GUEST_CTXT, offsetof(struct kvm_vcpu, arch.ctxt));
DEFINE(VCPU_HOST_CTXT, offsetof(struct kvm_vcpu, arch.host_cpu_context));
DEFINE(CPU_CTXT_VFP, offsetof(struct kvm_cpu_context, vfp));
DEFINE(VCPU_REGS, offsetof(struct kvm_vcpu, arch.regs));
DEFINE(VCPU_USR_REGS, offsetof(struct kvm_vcpu, arch.regs.usr_regs));
DEFINE(VCPU_SVC_REGS, offsetof(struct kvm_vcpu, arch.regs.svc_regs));

20
arch/arm/kvm/coproc.c
View File

@ -901,7 +901,7 @@ static int vfp_get_reg(const struct kvm_vcpu *vcpu, u64 id, void __user *uaddr)
if (vfpid < num_fp_regs()) {
if (KVM_REG_SIZE(id) != 8)
return -ENOENT;
return reg_to_user(uaddr, &vcpu->arch.vfp_guest.fpregs[vfpid],
return reg_to_user(uaddr, &vcpu->arch.ctxt.vfp.fpregs[vfpid],
id);
}
@ -911,13 +911,13 @@ static int vfp_get_reg(const struct kvm_vcpu *vcpu, u64 id, void __user *uaddr)
switch (vfpid) {
case KVM_REG_ARM_VFP_FPEXC:
return reg_to_user(uaddr, &vcpu->arch.vfp_guest.fpexc, id);
return reg_to_user(uaddr, &vcpu->arch.ctxt.vfp.fpexc, id);
case KVM_REG_ARM_VFP_FPSCR:
return reg_to_user(uaddr, &vcpu->arch.vfp_guest.fpscr, id);
return reg_to_user(uaddr, &vcpu->arch.ctxt.vfp.fpscr, id);
case KVM_REG_ARM_VFP_FPINST:
return reg_to_user(uaddr, &vcpu->arch.vfp_guest.fpinst, id);
return reg_to_user(uaddr, &vcpu->arch.ctxt.vfp.fpinst, id);
case KVM_REG_ARM_VFP_FPINST2:
return reg_to_user(uaddr, &vcpu->arch.vfp_guest.fpinst2, id);
return reg_to_user(uaddr, &vcpu->arch.ctxt.vfp.fpinst2, id);
case KVM_REG_ARM_VFP_MVFR0:
val = fmrx(MVFR0);
return reg_to_user(uaddr, &val, id);
@ -945,7 +945,7 @@ static int vfp_set_reg(struct kvm_vcpu *vcpu, u64 id, const void __user *uaddr)
if (vfpid < num_fp_regs()) {
if (KVM_REG_SIZE(id) != 8)
return -ENOENT;
return reg_from_user(&vcpu->arch.vfp_guest.fpregs[vfpid],
return reg_from_user(&vcpu->arch.ctxt.vfp.fpregs[vfpid],
uaddr, id);
}
@ -955,13 +955,13 @@ static int vfp_set_reg(struct kvm_vcpu *vcpu, u64 id, const void __user *uaddr)
switch (vfpid) {
case KVM_REG_ARM_VFP_FPEXC:
return reg_from_user(&vcpu->arch.vfp_guest.fpexc, uaddr, id);
return reg_from_user(&vcpu->arch.ctxt.vfp.fpexc, uaddr, id);
case KVM_REG_ARM_VFP_FPSCR:
return reg_from_user(&vcpu->arch.vfp_guest.fpscr, uaddr, id);
return reg_from_user(&vcpu->arch.ctxt.vfp.fpscr, uaddr, id);
case KVM_REG_ARM_VFP_FPINST:
return reg_from_user(&vcpu->arch.vfp_guest.fpinst, uaddr, id);
return reg_from_user(&vcpu->arch.ctxt.vfp.fpinst, uaddr, id);
case KVM_REG_ARM_VFP_FPINST2:
return reg_from_user(&vcpu->arch.vfp_guest.fpinst2, uaddr, id);
return reg_from_user(&vcpu->arch.ctxt.vfp.fpinst2, uaddr, id);
/* These are invariant. */
case KVM_REG_ARM_VFP_MVFR0:
if (reg_from_user(&val, uaddr, id))

10
arch/arm/kvm/interrupts.S
View File

@ -172,10 +172,11 @@ __kvm_vcpu_return:
#ifdef CONFIG_VFPv3
@ Switch VFP/NEON hardware state to the host's
add r7, vcpu, #VCPU_VFP_GUEST
add r7, vcpu, #(VCPU_GUEST_CTXT + CPU_CTXT_VFP)
store_vfp_state r7
add r7, vcpu, #VCPU_VFP_HOST
add r7, vcpu, #VCPU_HOST_CTXT
ldr r7, [r7]
add r7, r7, #CPU_CTXT_VFP
restore_vfp_state r7
after_vfp_restore:
@ -482,10 +483,11 @@ switch_to_guest_vfp:
set_hcptr vmtrap, (HCPTR_TCP(10) | HCPTR_TCP(11))
@ Switch VFP/NEON hardware state to the guest's
add r7, r0, #VCPU_VFP_HOST
add r7, r0, #VCPU_HOST_CTXT
ldr r7, [r7]
add r7, r7, #CPU_CTXT_VFP
store_vfp_state r7
add r7, r0, #VCPU_VFP_GUEST
add r7, r0, #(VCPU_GUEST_CTXT + CPU_CTXT_VFP)
restore_vfp_state r7
pop {r3-r7}