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Commit 31f3438e authored by Paul Mackerras's avatar Paul Mackerras Committed by Avi Kivity
Browse files

KVM: PPC: Move kvm_vcpu_ioctl_[gs]et_one_reg down to platform-specific code 



This moves the get/set_one_reg implementation down from powerpc.c into
booke.c, book3s_pr.c and book3s_hv.c.  This avoids #ifdefs in C code,
but more importantly, it fixes a bug on Book3s HV where we were
accessing beyond the end of the kvm_vcpu struct (via the to_book3s()
macro) and corrupting memory, causing random crashes and file corruption.

On Book3s HV we only accept setting the HIOR to zero, since the guest
runs in supervisor mode and its vectors are never offset from zero.

Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
[agraf update to apply on top of changed ONE_REG patches]
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent 1022fc3d

arch/powerpc/include/asm/kvm_ppc.h

+3 −0
Original line number Diff line number Diff line
@@ -176,6 +176,9 @@ int kvmppc_core_set_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs); 
void kvmppc_get_sregs_ivor(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs);

int kvmppc_set_sregs_ivor(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs);



int kvm_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg);

int kvm_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg);



void kvmppc_set_pid(struct kvm_vcpu *vcpu, u32 pid);



#ifdef CONFIG_KVM_BOOK3S_64_HV

arch/powerpc/kvm/book3s_hv.c

+36 −0
Original line number Diff line number Diff line
@@ -398,6 +398,42 @@ int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, 
	return 0;

}



int kvm_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)

{

	int r = -EINVAL;



	switch (reg->id) {

	case KVM_REG_PPC_HIOR:

		r = put_user(0, (u64 __user *)reg->addr);

		break;

	default:

		break;

	}



	return r;

}



int kvm_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)

{

	int r = -EINVAL;



	switch (reg->id) {

	case KVM_REG_PPC_HIOR:

	{

		u64 hior;

		/* Only allow this to be set to zero */

		r = get_user(hior, (u64 __user *)reg->addr);

		if (!r && (hior != 0))

			r = -EINVAL;

		break;

	}

	default:

		break;

	}



	return r;

}



int kvmppc_core_check_processor_compat(void)

{

	if (cpu_has_feature(CPU_FTR_HVMODE))

arch/powerpc/kvm/book3s_pr.c

+32 −0
Original line number Diff line number Diff line
@@ -874,6 +874,38 @@ int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, 
	return 0;

}



int kvm_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)

{

	int r = -EINVAL;



	switch (reg->id) {

	case KVM_REG_PPC_HIOR:

		r = put_user(to_book3s(vcpu)->hior, (u64 __user *)reg->addr);

		break;

	default:

		break;

	}



	return r;

}



int kvm_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)

{

	int r = -EINVAL;



	switch (reg->id) {

	case KVM_REG_PPC_HIOR:

		r = get_user(to_book3s(vcpu)->hior, (u64 __user *)reg->addr);

		if (!r)

			to_book3s(vcpu)->hior_explicit = true;

		break;

	default:

		break;

	}



	return r;

}



int kvmppc_core_check_processor_compat(void)

{

	return 0;

arch/powerpc/kvm/booke.c

+10 −0
Original line number Diff line number Diff line
@@ -887,6 +887,16 @@ int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, 
	return kvmppc_core_set_sregs(vcpu, sregs);

}



int kvm_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)

{

	return -EINVAL;

}



int kvm_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)

{

	return -EINVAL;

}



int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)

{

	return -ENOTSUPP;

arch/powerpc/kvm/powerpc.c

+0 −38
Original line number Diff line number Diff line
@@ -647,44 +647,6 @@ static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu, 
	return r;

}



static int kvm_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu,

				      struct kvm_one_reg *reg)

{

	int r = -EINVAL;



	switch (reg->id) {

#ifdef CONFIG_PPC_BOOK3S

	case KVM_REG_PPC_HIOR:

		r = put_user(to_book3s(vcpu)->hior, (u64 __user *)reg->addr);

		break;

#endif

	default:

		break;

	}



	return r;

}



static int kvm_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu,

				      struct kvm_one_reg *reg)

{

	int r = -EINVAL;



	switch (reg->id) {

#ifdef CONFIG_PPC_BOOK3S

	case KVM_ONE_REG_PPC_HIOR:

		r = get_user(to_book3s(vcpu)->hior, (u64 __user *)reg->addr);

		if (!r)

			to_book3s(vcpu)->hior_explicit = true;

		break;

#endif

	default:

		break;

	}



	return r;

}



int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,

                                    struct kvm_mp_state *mp_state)

{