Commit 672550fb authored by Christian Borntraeger's avatar Christian Borntraeger
Browse files

KVM: s390: Provide access to program parameter 



commit d208c79d (KVM: s390: Enable
the LPP facility for guests) enabled the LPP instruction for guests.
We should expose the program parameter as a pseudo register for
migration/reset etc. Lets also reset this value on initial CPU
reset.

Signed-off-by: default avatarChristian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: default avatarThomas Huth <thuth@linux.vnet.ibm.com>
Reviewed-by: default avatarJason J. Herne <jjherne@linux.vnet.ibm.com>
parent 684851a1

arch/s390/include/asm/kvm_host.h

+3 −1
Original line number Diff line number Diff line
@@ -107,7 +107,9 @@ struct kvm_s390_sie_block { 
	__u64	gbea;			/* 0x0180 */

	__u8	reserved188[24];	/* 0x0188 */

	__u32	fac;			/* 0x01a0 */

	__u8	reserved1a4[68];	/* 0x01a4 */

	__u8	reserved1a4[58];	/* 0x01a4 */

	__u64	pp;			/* 0x01de */

	__u8	reserved1e6[2];		/* 0x01e6 */

	__u64	itdba;			/* 0x01e8 */

	__u8	reserved1f0[16];	/* 0x01f0 */

} __attribute__((packed));

arch/s390/include/uapi/asm/kvm.h

+1 −0
Original line number Diff line number Diff line
@@ -76,4 +76,5 @@ struct kvm_sync_regs { 
#define KVM_REG_S390_PFTOKEN	(KVM_REG_S390 | KVM_REG_SIZE_U64 | 0x5)

#define KVM_REG_S390_PFCOMPARE	(KVM_REG_S390 | KVM_REG_SIZE_U64 | 0x6)

#define KVM_REG_S390_PFSELECT	(KVM_REG_S390 | KVM_REG_SIZE_U64 | 0x7)

#define KVM_REG_S390_PP		(KVM_REG_S390 | KVM_REG_SIZE_U64 | 0x8)

#endif

arch/s390/kvm/kvm-s390.c

+9 −0
Original line number Diff line number Diff line
@@ -386,6 +386,7 @@ static void kvm_s390_vcpu_initial_reset(struct kvm_vcpu *vcpu) 
	vcpu->arch.guest_fpregs.fpc = 0;

	asm volatile("lfpc %0" : : "Q" (vcpu->arch.guest_fpregs.fpc));

	vcpu->arch.sie_block->gbea = 1;

	vcpu->arch.sie_block->pp = 0;

	vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;

	kvm_clear_async_pf_completion_queue(vcpu);

	atomic_set_mask(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
@@ -571,6 +572,10 @@ static int kvm_arch_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, 
		r = put_user(vcpu->arch.pfault_select,

			     (u64 __user *)reg->addr);

		break;

	case KVM_REG_S390_PP:

		r = put_user(vcpu->arch.sie_block->pp,

			     (u64 __user *)reg->addr);

		break;

	default:

		break;

	}
@@ -612,6 +617,10 @@ static int kvm_arch_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu, 
		r = get_user(vcpu->arch.pfault_select,

			     (u64 __user *)reg->addr);

		break;

	case KVM_REG_S390_PP:

		r = get_user(vcpu->arch.sie_block->pp,

			     (u64 __user *)reg->addr);

		break;

	default:

		break;

	}

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