Commit 2ce316f0 authored by Paolo Bonzini's avatar Paolo Bonzini
Browse files

Merge tag 'kvm-s390-20140506' of... 

Merge tag 'kvm-s390-20140506' of git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into kvm-next

1. Fixes an error return code for the breakpoint setup

2. External interrupt fixes
2.1. Some interrupt conditions like cpu timer or clock comparator
stay pending even after the interrupt is injected. If the external
new PSW is enabled for interrupts this will result in an endless
loop. Usually this indicates a programming error in the guest OS.
Lets detect such situations and go to userspace. We will provide
a QEMU patch that sets the guest in panicked/crashed state to avoid
wasting CPU cycles.
2.2 Resend external interrupts back to the guest if the HW could
not do it.
-
parents 1171903d f14d82e0

Documentation/virtual/kvm/api.txt

+2 −0
Original line number Diff line number Diff line
@@ -2211,6 +2211,8 @@ KVM_S390_SIGP_STOP (vcpu) - sigp restart 
KVM_S390_PROGRAM_INT (vcpu) - program check; code in parm

KVM_S390_SIGP_SET_PREFIX (vcpu) - sigp set prefix; prefix address in parm

KVM_S390_RESTART (vcpu) - restart

KVM_S390_INT_CLOCK_COMP (vcpu) - clock comparator interrupt

KVM_S390_INT_CPU_TIMER (vcpu) - CPU timer interrupt

KVM_S390_INT_VIRTIO (vm) - virtio external interrupt; external interrupt

			   parameters in parm and parm64

KVM_S390_INT_SERVICE (vm) - sclp external interrupt; sclp parameter in parm

arch/s390/include/asm/kvm_host.h

+4 −1
Original line number Diff line number Diff line
@@ -132,7 +132,10 @@ struct kvm_s390_sie_block { 
	psw_t	gpsw;			/* 0x0090 */

	__u64	gg14;			/* 0x00a0 */

	__u64	gg15;			/* 0x00a8 */

	__u8	reservedb0[28];		/* 0x00b0 */

	__u8	reservedb0[20];		/* 0x00b0 */

	__u16	extcpuaddr;		/* 0x00c4 */

	__u16	eic;			/* 0x00c6 */

	__u32	reservedc8;		/* 0x00c8 */

	__u16	pgmilc;			/* 0x00cc */

	__u16	iprcc;			/* 0x00ce */

	__u32	dxc;			/* 0x00d0 */

arch/s390/kvm/guestdbg.c

+3 −2
Original line number Diff line number Diff line
@@ -223,9 +223,10 @@ int kvm_s390_import_bp_data(struct kvm_vcpu *vcpu, 
		goto error;

	}



	ret = copy_from_user(bp_data, dbg->arch.hw_bp, size);

	if (ret)

	if (copy_from_user(bp_data, dbg->arch.hw_bp, size)) {

		ret = -EFAULT;

		goto error;

	}



	for (i = 0; i < dbg->arch.nr_hw_bp; i++) {

		switch (bp_data[i].type) {

arch/s390/kvm/intercept.c

+45 −4
Original line number Diff line number Diff line
@@ -17,6 +17,7 @@ 


#include <asm/kvm_host.h>

#include <asm/asm-offsets.h>

#include <asm/irq.h>



#include "kvm-s390.h"

#include "gaccess.h"
@@ -46,9 +47,6 @@ static int handle_noop(struct kvm_vcpu *vcpu) 
	case 0x10:

		vcpu->stat.exit_external_request++;

		break;

	case 0x14:

		vcpu->stat.exit_external_interrupt++;

		break;

	default:

		break; /* nothing */

	}
@@ -233,6 +231,49 @@ static int handle_instruction_and_prog(struct kvm_vcpu *vcpu) 
	return rc2;

}



/**

 * handle_external_interrupt - used for external interruption interceptions

 *

 * This interception only occurs if the CPUSTAT_EXT_INT bit was set, or if

 * the new PSW does not have external interrupts disabled. In the first case,

 * we've got to deliver the interrupt manually, and in the second case, we

 * drop to userspace to handle the situation there.

 */

static int handle_external_interrupt(struct kvm_vcpu *vcpu)

{

	u16 eic = vcpu->arch.sie_block->eic;

	struct kvm_s390_interrupt irq;

	psw_t newpsw;

	int rc;



	vcpu->stat.exit_external_interrupt++;



	rc = read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &newpsw, sizeof(psw_t));

	if (rc)

		return rc;

	/* We can not handle clock comparator or timer interrupt with bad PSW */

	if ((eic == EXT_IRQ_CLK_COMP || eic == EXT_IRQ_CPU_TIMER) &&

	    (newpsw.mask & PSW_MASK_EXT))

		return -EOPNOTSUPP;



	switch (eic) {

	case EXT_IRQ_CLK_COMP:

		irq.type = KVM_S390_INT_CLOCK_COMP;

		break;

	case EXT_IRQ_CPU_TIMER:

		irq.type = KVM_S390_INT_CPU_TIMER;

		break;

	case EXT_IRQ_EXTERNAL_CALL:

		irq.type = KVM_S390_INT_EXTERNAL_CALL;

		irq.parm = vcpu->arch.sie_block->extcpuaddr;

		break;

	default:

		return -EOPNOTSUPP;

	}



	return kvm_s390_inject_vcpu(vcpu, &irq);

}



/**

 * Handle MOVE PAGE partial execution interception.

 *
@@ -291,7 +332,7 @@ static const intercept_handler_t intercept_funcs[] = { 
	[0x08 >> 2] = handle_prog,

	[0x0C >> 2] = handle_instruction_and_prog,

	[0x10 >> 2] = handle_noop,

	[0x14 >> 2] = handle_noop,

	[0x14 >> 2] = handle_external_interrupt,

	[0x18 >> 2] = handle_noop,

	[0x1C >> 2] = kvm_s390_handle_wait,

	[0x20 >> 2] = handle_validity,

arch/s390/kvm/interrupt.c

+32 −0
Original line number Diff line number Diff line
@@ -27,6 +27,8 @@ 
#define IOINT_CSSID_MASK 0x03fc0000

#define IOINT_AI_MASK 0x04000000



static void deliver_ckc_interrupt(struct kvm_vcpu *vcpu);



static int is_ioint(u64 type)

{

	return ((type & 0xfffe0000u) != 0xfffe0000u);
@@ -89,6 +91,14 @@ static int __interrupt_is_deliverable(struct kvm_vcpu *vcpu, 
		if (vcpu->arch.sie_block->gcr[0] & 0x4000ul)

			return 1;

		return 0;

	case KVM_S390_INT_CLOCK_COMP:

		return ckc_interrupts_enabled(vcpu);

	case KVM_S390_INT_CPU_TIMER:

		if (psw_extint_disabled(vcpu))

			return 0;

		if (vcpu->arch.sie_block->gcr[0] & 0x400ul)

			return 1;

		return 0;

	case KVM_S390_INT_SERVICE:

	case KVM_S390_INT_PFAULT_INIT:

	case KVM_S390_INT_PFAULT_DONE:
@@ -166,6 +176,8 @@ static void __set_intercept_indicator(struct kvm_vcpu *vcpu, 
	case KVM_S390_INT_PFAULT_INIT:

	case KVM_S390_INT_PFAULT_DONE:

	case KVM_S390_INT_VIRTIO:

	case KVM_S390_INT_CLOCK_COMP:

	case KVM_S390_INT_CPU_TIMER:

		if (psw_extint_disabled(vcpu))

			__set_cpuflag(vcpu, CPUSTAT_EXT_INT);

		else
@@ -326,6 +338,24 @@ static void __do_deliver_interrupt(struct kvm_vcpu *vcpu, 
				    &vcpu->arch.sie_block->gpsw,

				    sizeof(psw_t));

		break;

	case KVM_S390_INT_CLOCK_COMP:

		trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,

						 inti->ext.ext_params, 0);

		deliver_ckc_interrupt(vcpu);

		break;

	case KVM_S390_INT_CPU_TIMER:

		trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,

						 inti->ext.ext_params, 0);

		rc  = put_guest_lc(vcpu, EXT_IRQ_CPU_TIMER,

				   (u16 *)__LC_EXT_INT_CODE);

		rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,

				     &vcpu->arch.sie_block->gpsw,

				     sizeof(psw_t));

		rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,

				    &vcpu->arch.sie_block->gpsw, sizeof(psw_t));

		rc |= put_guest_lc(vcpu, inti->ext.ext_params,

				   (u32 *)__LC_EXT_PARAMS);

		break;

	case KVM_S390_INT_SERVICE:

		VCPU_EVENT(vcpu, 4, "interrupt: sclp parm:%x",

			   inti->ext.ext_params);
@@ -984,6 +1014,8 @@ int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, 
		break;

	case KVM_S390_SIGP_STOP:

	case KVM_S390_RESTART:

	case KVM_S390_INT_CLOCK_COMP:

	case KVM_S390_INT_CPU_TIMER:

		VCPU_EVENT(vcpu, 3, "inject: type %x", s390int->type);

		inti->type = s390int->type;

		break;

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