Commit 324b3e63 authored by Alexander Graf's avatar Alexander Graf
Browse files

KVM: PPC: BookE: Add EPR ONE_REG sync 



We need to be able to read and write the contents of the EPR register
from user space.

This patch implements that logic through the ONE_REG API and declares
its (never implemented) SREGS counterpart as deprecated.

Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
parent 1c810636

Documentation/virtual/kvm/api.txt

+1 −0
Original line number Diff line number Diff line
@@ -1774,6 +1774,7 @@ registers, find a list below: 
  PPC   | KVM_REG_PPC_VPA_SLB   | 128

  PPC   | KVM_REG_PPC_VPA_DTL   | 128

  PPC   | KVM_REG_PPC_EPCR	| 32

  PPC   | KVM_REG_PPC_EPR	| 32



4.69 KVM_GET_ONE_REG

arch/powerpc/include/uapi/asm/kvm.h

+5 −1
Original line number Diff line number Diff line
@@ -114,7 +114,10 @@ struct kvm_regs { 
/* Embedded Floating Point (SPE) -- IVOR32-34 if KVM_SREGS_E_IVOR */

#define KVM_SREGS_E_SPE			(1 << 9)



/* External Proxy (EXP) -- EPR */

/*

 * DEPRECATED! USE ONE_REG FOR THIS ONE!

 * External Proxy (EXP) -- EPR

 */

#define KVM_SREGS_EXP			(1 << 10)



/* External PID (E.PD) -- EPSC/EPLC */
@@ -412,5 +415,6 @@ struct kvm_get_htab_header { 
#define KVM_REG_PPC_VPA_DTL	(KVM_REG_PPC | KVM_REG_SIZE_U128 | 0x84)



#define KVM_REG_PPC_EPCR	(KVM_REG_PPC | KVM_REG_SIZE_U32 | 0x85)

#define KVM_REG_PPC_EPR		(KVM_REG_PPC | KVM_REG_SIZE_U32 | 0x86)



#endif /* __LINUX_KVM_POWERPC_H */

arch/powerpc/kvm/booke.c

+21 −0
Original line number Diff line number Diff line
@@ -300,6 +300,15 @@ static void set_guest_esr(struct kvm_vcpu *vcpu, u32 esr) 
#endif

}



static unsigned long get_guest_epr(struct kvm_vcpu *vcpu)

{

#ifdef CONFIG_KVM_BOOKE_HV

	return mfspr(SPRN_GEPR);

#else

	return vcpu->arch.epr;

#endif

}



/* Deliver the interrupt of the corresponding priority, if possible. */

static int kvmppc_booke_irqprio_deliver(struct kvm_vcpu *vcpu,

                                        unsigned int priority)
@@ -1405,6 +1414,11 @@ int kvm_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg) 
				 &vcpu->arch.dbg_reg.dac[dac], sizeof(u64));

		break;

	}

	case KVM_REG_PPC_EPR: {

		u32 epr = get_guest_epr(vcpu);

		r = put_user(epr, (u32 __user *)(long)reg->addr);

		break;

	}

#if defined(CONFIG_64BIT)

	case KVM_REG_PPC_EPCR:

		r = put_user(vcpu->arch.epcr, (u32 __user *)(long)reg->addr);
@@ -1437,6 +1451,13 @@ int kvm_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg) 
			     (u64 __user *)(long)reg->addr, sizeof(u64));

		break;

	}

	case KVM_REG_PPC_EPR: {

		u32 new_epr;

		r = get_user(new_epr, (u32 __user *)(long)reg->addr);

		if (!r)

			kvmppc_set_epr(vcpu, new_epr);

		break;

	}

#if defined(CONFIG_64BIT)

	case KVM_REG_PPC_EPCR: {

		u32 new_epcr;