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Commit 6a3f95a6 authored by Thomas Huth's avatar Thomas Huth Committed by Paolo Bonzini
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KVM: s390: Intercept SCK instruction 



Interception of the SET CLOCK instruction is mandatory, so this patch
provides a simple handler for this instruction (by setting up the
"epoch" field in the sie_block).

Signed-off-by: default avatarThomas Huth <thuth@linux.vnet.ibm.com>
Acked-by: default avatarCornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: default avatarChristian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent aca84241

arch/s390/kvm/priv.c

+33 −0
Original line number Diff line number Diff line
@@ -30,6 +30,38 @@ 
#include "kvm-s390.h"

#include "trace.h"



/* Handle SCK (SET CLOCK) interception */

static int handle_set_clock(struct kvm_vcpu *vcpu)

{

	struct kvm_vcpu *cpup;

	s64 hostclk, val;

	u64 op2;

	int i;



	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)

		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);



	op2 = kvm_s390_get_base_disp_s(vcpu);

	if (op2 & 7)	/* Operand must be on a doubleword boundary */

		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);

	if (get_guest(vcpu, val, (u64 __user *) op2))

		return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);



	if (store_tod_clock(&hostclk)) {

		kvm_s390_set_psw_cc(vcpu, 3);

		return 0;

	}

	val = (val - hostclk) & ~0x3fUL;



	mutex_lock(&vcpu->kvm->lock);

	kvm_for_each_vcpu(i, cpup, vcpu->kvm)

		cpup->arch.sie_block->epoch = val;

	mutex_unlock(&vcpu->kvm->lock);



	kvm_s390_set_psw_cc(vcpu, 0);

	return 0;

}



static int handle_set_prefix(struct kvm_vcpu *vcpu)

{

	u64 operand2;
@@ -465,6 +497,7 @@ static int handle_stsi(struct kvm_vcpu *vcpu) 


static const intercept_handler_t b2_handlers[256] = {

	[0x02] = handle_stidp,

	[0x04] = handle_set_clock,

	[0x10] = handle_set_prefix,

	[0x11] = handle_store_prefix,

	[0x12] = handle_store_cpu_address,