Release 4.14 arch/powerpc/kvm/booke.c

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License, version 2, as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * Copyright IBM Corp. 2007
 * Copyright 2010-2011 Freescale Semiconductor, Inc.
 *
 * Authors: Hollis Blanchard <hollisb@us.ibm.com>
 *          Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
 *          Scott Wood <scottwood@freescale.com>
 *          Varun Sethi <varun.sethi@freescale.com>
 */

#include <linux/errno.h>
#include <linux/err.h>
#include <linux/kvm_host.h>
#include <linux/gfp.h>
#include <linux/module.h>
#include <linux/vmalloc.h>
#include <linux/fs.h>

#include <asm/cputable.h>
#include <linux/uaccess.h>
#include <asm/kvm_ppc.h>
#include <asm/cacheflush.h>
#include <asm/dbell.h>
#include <asm/hw_irq.h>
#include <asm/irq.h>
#include <asm/time.h>

#include "timing.h"
#include "booke.h"


#define CREATE_TRACE_POINTS
#include "trace_booke.h"


unsigned long kvmppc_booke_handlers;


#define VM_STAT(x) offsetof(struct kvm, stat.x), KVM_STAT_VM

#define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU


struct kvm_stats_debugfs_item debugfs_entries[] = {
	{ "mmio",       VCPU_STAT(mmio_exits) },
	{ "sig",        VCPU_STAT(signal_exits) },
	{ "itlb_r",     VCPU_STAT(itlb_real_miss_exits) },
	{ "itlb_v",     VCPU_STAT(itlb_virt_miss_exits) },
	{ "dtlb_r",     VCPU_STAT(dtlb_real_miss_exits) },
	{ "dtlb_v",     VCPU_STAT(dtlb_virt_miss_exits) },
	{ "sysc",       VCPU_STAT(syscall_exits) },
	{ "isi",        VCPU_STAT(isi_exits) },
	{ "dsi",        VCPU_STAT(dsi_exits) },
	{ "inst_emu",   VCPU_STAT(emulated_inst_exits) },
	{ "dec",        VCPU_STAT(dec_exits) },
	{ "ext_intr",   VCPU_STAT(ext_intr_exits) },
	{ "halt_successful_poll", VCPU_STAT(halt_successful_poll) },
	{ "halt_attempted_poll", VCPU_STAT(halt_attempted_poll) },
	{ "halt_poll_invalid", VCPU_STAT(halt_poll_invalid) },
	{ "halt_wakeup", VCPU_STAT(halt_wakeup) },
	{ "doorbell", VCPU_STAT(dbell_exits) },
	{ "guest doorbell", VCPU_STAT(gdbell_exits) },
	{ "remote_tlb_flush", VM_STAT(remote_tlb_flush) },
	{ NULL }
};

/* TODO: use vcpu_printf() */


void kvmppc_dump_vcpu(struct kvm_vcpu *vcpu)
{
	int i;

	printk("pc:   %08lx msr:  %08llx\n", vcpu->arch.pc, vcpu->arch.shared->msr);
	printk("lr:   %08lx ctr:  %08lx\n", vcpu->arch.lr, vcpu->arch.ctr);
	printk("srr0: %08llx srr1: %08llx\n", vcpu->arch.shared->srr0,
					    vcpu->arch.shared->srr1);

	printk("exceptions: %08lx\n", vcpu->arch.pending_exceptions);

	for (i = 0; i < 32; i += 4) {
		printk("gpr%02d: %08lx %08lx %08lx %08lx\n", i,
		       kvmppc_get_gpr(vcpu, i),
		       kvmppc_get_gpr(vcpu, i+1),
		       kvmppc_get_gpr(vcpu, i+2),
		       kvmppc_get_gpr(vcpu, i+3));
	}
}

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#ifdef CONFIG_SPE


void kvmppc_vcpu_disable_spe(struct kvm_vcpu *vcpu)
{
	preempt_disable();
	enable_kernel_spe();
	kvmppc_save_guest_spe(vcpu);
	disable_kernel_spe();
	vcpu->arch.shadow_msr &= ~MSR_SPE;
	preempt_enable();
}

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static void kvmppc_vcpu_enable_spe(struct kvm_vcpu *vcpu)
{
	preempt_disable();
	enable_kernel_spe();
	kvmppc_load_guest_spe(vcpu);
	disable_kernel_spe();
	vcpu->arch.shadow_msr |= MSR_SPE;
	preempt_enable();
}

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static void kvmppc_vcpu_sync_spe(struct kvm_vcpu *vcpu)
{
	if (vcpu->arch.shared->msr & MSR_SPE) {
		if (!(vcpu->arch.shadow_msr & MSR_SPE))
			kvmppc_vcpu_enable_spe(vcpu);
	} else if (vcpu->arch.shadow_msr & MSR_SPE) {
		kvmppc_vcpu_disable_spe(vcpu);
	}
}
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#else


static void kvmppc_vcpu_sync_spe(struct kvm_vcpu *vcpu)
{
}
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#endif

/*
 * Load up guest vcpu FP state if it's needed.
 * It also set the MSR_FP in thread so that host know
 * we're holding FPU, and then host can help to save
 * guest vcpu FP state if other threads require to use FPU.
 * This simulates an FP unavailable fault.
 *
 * It requires to be called with preemption disabled.
 */


static inline void kvmppc_load_guest_fp(struct kvm_vcpu *vcpu)
{
#ifdef CONFIG_PPC_FPU
	if (!(current->thread.regs->msr & MSR_FP)) {
		enable_kernel_fp();
		load_fp_state(&vcpu->arch.fp);
		disable_kernel_fp();
		current->thread.fp_save_area = &vcpu->arch.fp;
		current->thread.regs->msr |= MSR_FP;
	}
#endif
}

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/*
 * Save guest vcpu FP state into thread.
 * It requires to be called with preemption disabled.
 */


static inline void kvmppc_save_guest_fp(struct kvm_vcpu *vcpu)
{
#ifdef CONFIG_PPC_FPU
	if (current->thread.regs->msr & MSR_FP)
		giveup_fpu(current);
	current->thread.fp_save_area = NULL;
#endif
}

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static void kvmppc_vcpu_sync_fpu(struct kvm_vcpu *vcpu)
{
#if defined(CONFIG_PPC_FPU) && !defined(CONFIG_KVM_BOOKE_HV)
	/* We always treat the FP bit as enabled from the host
           perspective, so only need to adjust the shadow MSR */
	vcpu->arch.shadow_msr &= ~MSR_FP;
	vcpu->arch.shadow_msr |= vcpu->arch.shared->msr & MSR_FP;
#endif
}

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/*
 * Simulate AltiVec unavailable fault to load guest state
 * from thread to AltiVec unit.
 * It requires to be called with preemption disabled.
 */


static inline void kvmppc_load_guest_altivec(struct kvm_vcpu *vcpu)
{
#ifdef CONFIG_ALTIVEC
	if (cpu_has_feature(CPU_FTR_ALTIVEC)) {
		if (!(current->thread.regs->msr & MSR_VEC)) {
			enable_kernel_altivec();
			load_vr_state(&vcpu->arch.vr);
			disable_kernel_altivec();
			current->thread.vr_save_area = &vcpu->arch.vr;
			current->thread.regs->msr |= MSR_VEC;
		}
	}
#endif
}

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/*
 * Save guest vcpu AltiVec state into thread.
 * It requires to be called with preemption disabled.
 */


static inline void kvmppc_save_guest_altivec(struct kvm_vcpu *vcpu)
{
#ifdef CONFIG_ALTIVEC
	if (cpu_has_feature(CPU_FTR_ALTIVEC)) {
		if (current->thread.regs->msr & MSR_VEC)
			giveup_altivec(current);
		current->thread.vr_save_area = NULL;
	}
#endif
}

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static void kvmppc_vcpu_sync_debug(struct kvm_vcpu *vcpu)
{
	/* Synchronize guest's desire to get debug interrupts into shadow MSR */
#ifndef CONFIG_KVM_BOOKE_HV
	vcpu->arch.shadow_msr &= ~MSR_DE;
	vcpu->arch.shadow_msr |= vcpu->arch.shared->msr & MSR_DE;
#endif

	/* Force enable debug interrupts when user space wants to debug */
	if (vcpu->guest_debug) {
#ifdef CONFIG_KVM_BOOKE_HV
		/*
                 * Since there is no shadow MSR, sync MSR_DE into the guest
                 * visible MSR.
                 */
		vcpu->arch.shared->msr |= MSR_DE;
#else
		vcpu->arch.shadow_msr |= MSR_DE;
		vcpu->arch.shared->msr &= ~MSR_DE;
#endif
	}
}

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/*
 * Helper function for "full" MSR writes.  No need to call this if only
 * EE/CE/ME/DE/RI are changing.
 */


void kvmppc_set_msr(struct kvm_vcpu *vcpu, u32 new_msr)
{
	u32 old_msr = vcpu->arch.shared->msr;

#ifdef CONFIG_KVM_BOOKE_HV
	new_msr |= MSR_GS;
#endif

	vcpu->arch.shared->msr = new_msr;

	kvmppc_mmu_msr_notify(vcpu, old_msr);
	kvmppc_vcpu_sync_spe(vcpu);
	kvmppc_vcpu_sync_fpu(vcpu);
	kvmppc_vcpu_sync_debug(vcpu);
}

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static void kvmppc_booke_queue_irqprio(struct kvm_vcpu *vcpu,
                                       unsigned int priority)
{
	trace_kvm_booke_queue_irqprio(vcpu, priority);
	set_bit(priority, &vcpu->arch.pending_exceptions);
}

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void kvmppc_core_queue_dtlb_miss(struct kvm_vcpu *vcpu,
				 ulong dear_flags, ulong esr_flags)
{
	vcpu->arch.queued_dear = dear_flags;
	vcpu->arch.queued_esr = esr_flags;
	kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_DTLB_MISS);
}

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void kvmppc_core_queue_data_storage(struct kvm_vcpu *vcpu,
				    ulong dear_flags, ulong esr_flags)
{
	vcpu->arch.queued_dear = dear_flags;
	vcpu->arch.queued_esr = esr_flags;
	kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_DATA_STORAGE);
}

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void kvmppc_core_queue_itlb_miss(struct kvm_vcpu *vcpu)
{
	kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_ITLB_MISS);
}

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void kvmppc_core_queue_inst_storage(struct kvm_vcpu *vcpu, ulong esr_flags)
{
	vcpu->arch.queued_esr = esr_flags;
	kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_INST_STORAGE);
}

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static void kvmppc_core_queue_alignment(struct kvm_vcpu *vcpu, ulong dear_flags,
					ulong esr_flags)
{
	vcpu->arch.queued_dear = dear_flags;
	vcpu->arch.queued_esr = esr_flags;
	kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_ALIGNMENT);
}

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void kvmppc_core_queue_program(struct kvm_vcpu *vcpu, ulong esr_flags)
{
	vcpu->arch.queued_esr = esr_flags;
	kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_PROGRAM);
}

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void kvmppc_core_queue_fpunavail(struct kvm_vcpu *vcpu)
{
	kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_FP_UNAVAIL);
}

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void kvmppc_core_queue_dec(struct kvm_vcpu *vcpu)
{
	kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_DECREMENTER);
}

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int kvmppc_core_pending_dec(struct kvm_vcpu *vcpu)
{
	return test_bit(BOOKE_IRQPRIO_DECREMENTER, &vcpu->arch.pending_exceptions);
}

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void kvmppc_core_dequeue_dec(struct kvm_vcpu *vcpu)
{
	clear_bit(BOOKE_IRQPRIO_DECREMENTER, &vcpu->arch.pending_exceptions);
}

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void kvmppc_core_queue_external(struct kvm_vcpu *vcpu,
                                struct kvm_interrupt *irq)
{
	unsigned int prio = BOOKE_IRQPRIO_EXTERNAL;

	if (irq->irq == KVM_INTERRUPT_SET_LEVEL)
		prio = BOOKE_IRQPRIO_EXTERNAL_LEVEL;

	kvmppc_booke_queue_irqprio(vcpu, prio);
}

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void kvmppc_core_dequeue_external(struct kvm_vcpu *vcpu)
{
	clear_bit(BOOKE_IRQPRIO_EXTERNAL, &vcpu->arch.pending_exceptions);
	clear_bit(BOOKE_IRQPRIO_EXTERNAL_LEVEL, &vcpu->arch.pending_exceptions);
}

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static void kvmppc_core_queue_watchdog(struct kvm_vcpu *vcpu)
{
	kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_WATCHDOG);
}

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static void kvmppc_core_dequeue_watchdog(struct kvm_vcpu *vcpu)
{
	clear_bit(BOOKE_IRQPRIO_WATCHDOG, &vcpu->arch.pending_exceptions);
}

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void kvmppc_core_queue_debug(struct kvm_vcpu *vcpu)
{
	kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_DEBUG);
}

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void kvmppc_core_dequeue_debug(struct kvm_vcpu *vcpu)
{
	clear_bit(BOOKE_IRQPRIO_DEBUG, &vcpu->arch.pending_exceptions);
}

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static void set_guest_srr(struct kvm_vcpu *vcpu, unsigned long srr0, u32 srr1)
{
	kvmppc_set_srr0(vcpu, srr0);
	kvmppc_set_srr1(vcpu, srr1);
}

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static void set_guest_csrr(struct kvm_vcpu *vcpu, unsigned long srr0, u32 srr1)
{
	vcpu->arch.csrr0 = srr0;
	vcpu->arch.csrr1 = srr1;
}

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static void set_guest_dsrr(struct kvm_vcpu *vcpu, unsigned long srr0, u32 srr1)
{
	if (cpu_has_feature(CPU_FTR_DEBUG_LVL_EXC)) {
		vcpu->arch.dsrr0 = srr0;
		vcpu->arch.dsrr1 = srr1;
	} else {
		set_guest_csrr(vcpu, srr0, srr1);
	}
}

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static void set_guest_mcsrr(struct kvm_vcpu *vcpu, unsigned long srr0, u32 srr1)
{
	vcpu->arch.mcsrr0 = srr0;
	vcpu->arch.mcsrr1 = srr1;
}

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


static int kvmppc_booke_irqprio_deliver(struct kvm_vcpu *vcpu,
                                        unsigned int priority)
{
	int allowed = 0;
	ulong msr_mask = 0;
	bool update_esr = false, update_dear = false, update_epr = false;
	ulong crit_raw = vcpu->arch.shared->critical;
	ulong crit_r1 = kvmppc_get_gpr(vcpu, 1);
	bool crit;
	bool keep_irq = false;
	enum int_class int_class;
	ulong new_msr = vcpu->arch.shared->msr;

	/* Truncate crit indicators in 32 bit mode */
	if (!(vcpu->arch.shared->msr & MSR_SF)) {
		crit_raw &= 0xffffffff;
		crit_r1 &= 0xffffffff;
	}

	/* Critical section when crit == r1 */
	crit = (crit_raw == crit_r1);
	/* ... and we're in supervisor mode */
	crit = crit && !(vcpu->arch.shared->msr & MSR_PR);

	if (priority == BOOKE_IRQPRIO_EXTERNAL_LEVEL) {
		priority = BOOKE_IRQPRIO_EXTERNAL;
		keep_irq = true;
	}

	if ((priority == BOOKE_IRQPRIO_EXTERNAL) && vcpu->arch.epr_flags)
		update_epr = true;

	switch (priority) {
	case BOOKE_IRQPRIO_DTLB_MISS:
	case BOOKE_IRQPRIO_DATA_STORAGE:
	case BOOKE_IRQPRIO_ALIGNMENT:
		update_dear = true;
		/* fall through */
	case BOOKE_IRQPRIO_INST_STORAGE:
	case BOOKE_IRQPRIO_PROGRAM:
		update_esr = true;
		/* fall through */
	case BOOKE_IRQPRIO_ITLB_MISS:
	case BOOKE_IRQPRIO_SYSCALL:
	case BOOKE_IRQPRIO_FP_UNAVAIL:
#ifdef CONFIG_SPE_POSSIBLE
	case BOOKE_IRQPRIO_SPE_UNAVAIL:
	case BOOKE_IRQPRIO_SPE_FP_DATA:
	case BOOKE_IRQPRIO_SPE_FP_ROUND:
#endif
#ifdef CONFIG_ALTIVEC
	case BOOKE_IRQPRIO_ALTIVEC_UNAVAIL:
	case BOOKE_IRQPRIO_ALTIVEC_ASSIST:
#endif
	case BOOKE_IRQPRIO_AP_UNAVAIL:
		allowed = 1;
		msr_mask = MSR_CE | MSR_ME | MSR_DE;
		int_class = INT_CLASS_NONCRIT;
		break;
	case BOOKE_IRQPRIO_WATCHDOG:
	case BOOKE_IRQPRIO_CRITICAL:
	case BOOKE_IRQPRIO_DBELL_CRIT:
		allowed = vcpu->arch.shared->msr & MSR_CE;
		allowed = allowed && !crit;
		msr_mask = MSR_ME;
		int_class = INT_CLASS_CRIT;
		break;
	case BOOKE_IRQPRIO_MACHINE_CHECK:
		allowed = vcpu->arch.shared->msr & MSR_ME;
		allowed = allowed && !crit;
		int_class = INT_CLASS_MC;
		break;
	case BOOKE_IRQPRIO_DECREMENTER:
	case BOOKE_IRQPRIO_FIT:
		keep_irq = true;
		/* fall through */
	case BOOKE_IRQPRIO_EXTERNAL:
	case BOOKE_IRQPRIO_DBELL:
		allowed = vcpu->arch.shared->msr & MSR_EE;
		allowed = allowed && !crit;
		msr_mask = MSR_CE | MSR_ME | MSR_DE;
		int_class = INT_CLASS_NONCRIT;
		break;
	case BOOKE_IRQPRIO_DEBUG:
		allowed = vcpu->arch.shared->msr & MSR_DE;
		allowed = allowed && !crit;
		msr_mask = MSR_ME;
		if (cpu_has_feature(CPU_FTR_DEBUG_LVL_EXC))
			int_class = INT_CLASS_DBG;
		else
			int_class = INT_CLASS_CRIT;

		break;
	}

	if (allowed) {
		switch (int_class) {
		case INT_CLASS_NONCRIT:
			set_guest_srr(vcpu, vcpu->arch.pc,
				      vcpu->arch.shared->msr);
			break;
		case INT_CLASS_CRIT:
			set_guest_csrr(vcpu, vcpu->arch.pc,
				       vcpu->arch.shared->msr);
			break;
		case INT_CLASS_DBG:
			set_guest_dsrr(vcpu, vcpu->arch.pc,
				       vcpu->arch.shared->msr);
			break;
		case INT_CLASS_MC:
			set_guest_mcsrr(vcpu, vcpu->arch.pc,
					vcpu->arch.shared->msr);
			break;
		}

		vcpu->arch.pc = vcpu->arch.ivpr | vcpu->arch.ivor[priority];
		if (update_esr == true)
			kvmppc_set_esr(vcpu, vcpu->arch.queued_esr);
		if (update_dear == true)
			kvmppc_set_dar(vcpu, vcpu->arch.queued_dear);
		if (update_epr == true) {
			if (vcpu->arch.epr_flags & KVMPPC_EPR_USER)
				kvm_make_request(KVM_REQ_EPR_EXIT, vcpu);
			else if (vcpu->arch.epr_flags & KVMPPC_EPR_KERNEL) {
				BUG_ON(vcpu->arch.irq_type != KVMPPC_IRQ_MPIC);
				kvmppc_mpic_set_epr(vcpu);
			}
		}

		new_msr &= msr_mask;
#if defined(CONFIG_64BIT)
		if (vcpu->arch.epcr & SPRN_EPCR_ICM)
			new_msr |= MSR_CM;
#endif
		kvmppc_set_msr(vcpu, new_msr);

		if (!keep_irq)
			clear_bit(priority, &vcpu->arch.pending_exceptions);
	}

#ifdef CONFIG_KVM_BOOKE_HV
	/*
         * If an interrupt is pending but masked, raise a guest doorbell
         * so that we are notified when the guest enables the relevant
         * MSR bit.
         */
	if (vcpu->arch.pending_exceptions & BOOKE_IRQMASK_EE)
		kvmppc_set_pending_interrupt(vcpu, INT_CLASS_NONCRIT);
	if (vcpu->arch.pending_exceptions & BOOKE_IRQMASK_CE)
		kvmppc_set_pending_interrupt(vcpu, INT_CLASS_CRIT);
	if (vcpu->arch.pending_exceptions & BOOKE_IRQPRIO_MACHINE_CHECK)
		kvmppc_set_pending_interrupt(vcpu, INT_CLASS_MC);
#endif

	return allowed;
}

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Scott Wood
322
43.93%
4
19.05%
Hollis Blanchard
155
21.15%
3
14.29%
Bharat Bhushan
123
16.78%
4
19.05%
Alexander Graf
66
9.00%
7
33.33%
Mihai Caraman
52
7.09%
2
9.52%
Liu Yu
15
2.05%
1
4.76%
Total
733
100.00%
21
100.00%

/*
 * Return the number of jiffies until the next timeout.  If the timeout is
 * longer than the NEXT_TIMER_MAX_DELTA, then return NEXT_TIMER_MAX_DELTA
 * because the larger value can break the timer APIs.
 */


static unsigned long watchdog_next_timeout(struct kvm_vcpu *vcpu)
{
	u64 tb, wdt_tb, wdt_ticks = 0;
	u64 nr_jiffies = 0;
	u32 period = TCR_GET_WP(vcpu->arch.tcr);

	wdt_tb = 1ULL << (63 - period);
	tb = get_tb();
	/*
         * The watchdog timeout will hapeen when TB bit corresponding
         * to watchdog will toggle from 0 to 1.
         */
	if (tb & wdt_tb)
		wdt_ticks = wdt_tb;

	wdt_ticks += wdt_tb - (tb & (wdt_tb - 1));

	/* Convert timebase ticks to jiffies */
	nr_jiffies = wdt_ticks;

	if (do_div(nr_jiffies, tb_ticks_per_jiffy))
		nr_jiffies++;

	return min_t(unsigned long long, nr_jiffies, NEXT_TIMER_MAX_DELTA);
}

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Bharat Bhushan
105
100.00%
1
100.00%
Total
105
100.00%
1
100.00%



static void arm_next_watchdog(struct kvm_vcpu *vcpu)
{
	unsigned long nr_jiffies;
	unsigned long flags;

	/*
         * If TSR_ENW and TSR_WIS are not set then no need to exit to
         * userspace, so clear the KVM_REQ_WATCHDOG request.
         */
	if ((vcpu->arch.tsr & (TSR_ENW | TSR_WIS)) != (TSR_ENW | TSR_WIS))
		kvm_clear_request(KVM_REQ_WATCHDOG, vcpu);

	spin_lock_irqsave(&vcpu->arch.wdt_lock, flags);
	nr_jiffies = watchdog_next_timeout(vcpu);
	/*
         * If the number of jiffies of watchdog timer >= NEXT_TIMER_MAX_DELTA
         * then do not run the watchdog timer as this can break timer APIs.
         */
	if (nr_jiffies < NEXT_TIMER_MAX_DELTA)
		mod_timer(&vcpu->arch.wdt_timer, jiffies + nr_jiffies);
	else
		del_timer(&vcpu->arch.wdt_timer);
	spin_unlock_irqrestore(&vcpu->arch.wdt_lock, flags);
}

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Bharat Bhushan
111
99.11%
1
50.00%
Radim Krčmář
1
0.89%
1
50.00%
Total
112
100.00%
2
100.00%



void kvmppc_watchdog_func(unsigned long data)
{
	struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
	u32 tsr, new_tsr;
	int final;

	do {
		new_tsr = tsr = vcpu->arch.tsr;
		final = 0;

		/* Time out event */
		if (tsr & TSR_ENW) {
			if (tsr & TSR_WIS)
				final = 1;
			else
				new_tsr = tsr | TSR_WIS;
		} else {
			new_tsr = tsr | TSR_ENW;
		}
	} while (cmpxchg(&vcpu->arch.tsr, tsr, new_tsr) != tsr);

	if (new_tsr & TSR_WIS) {
		smp_wmb();
		kvm_make_request(KVM_REQ_PENDING_TIMER, vcpu);
		kvm_vcpu_kick(vcpu);
	}

	/*
         * If this is final watchdog expiry and some action is required
         * then exit to userspace.
         */
	if (final && (vcpu->arch.tcr & TCR_WRC_MASK) &&
	    vcpu->arch.watchdog_enabled) {
		smp_wmb();
		kvm_make_request(KVM_REQ_WATCHDOG, vcpu);
		kvm_vcpu_kick(vcpu);
	}

	/*
         * Stop running the watchdog timer after final expiration to
         * prevent the host from being flooded with timers if the
         * guest sets a short period.
         * Timers will resume when TSR/TCR is updated next time.
         */
	if (!final)
		arm_next_watchdog(vcpu);
}

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CommitProp
Bharat Bhushan
132
76.74%
1
16.67%
Scott Wood
24
13.95%
1
16.67%
Hollis Blanchard
9
5.23%
2
33.33%
Liu Yu
5
2.91%
1
16.67%
Alexander Graf
2
1.16%
1
16.67%
Total
172
100.00%
6
100.00%



static void update_timer_ints(struct kvm_vcpu *vcpu)
{
	if ((vcpu->arch.tcr & TCR_DIE) && (vcpu->arch.tsr & TSR_DIS))
		kvmppc_core_queue_dec(vcpu);
	else
		kvmppc_core_dequeue_dec(vcpu);

	if ((vcpu->arch.tcr & TCR_WIE) && (vcpu->arch.tsr & TSR_WIS))
		kvmppc_core_queue_watchdog(vcpu);
	else
		kvmppc_core_dequeue_watchdog(vcpu);
}

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Scott Wood
44
57.14%
1
50.00%
Bharat Bhushan
33
42.86%
1
50.00%
Total
77
100.00%
2
100.00%



static void kvmppc_core_check_exceptions(struct kvm_vcpu *vcpu)
{
	unsigned long *pending = &vcpu->arch.pending_exceptions;
	unsigned int priority;

	priority = __ffs(*pending);
	while (priority < BOOKE_IRQPRIO_MAX) {
		if (kvmppc_booke_irqprio_deliver(vcpu, priority))
			break;

		priority = find_next_bit(pending,
		                         BITS_PER_BYTE * sizeof(*pending),
		                         priority + 1);
	}

	/* Tell the guest about our interrupt status */
	vcpu->arch.shared->int_pending = !!*pending;
}

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CommitProp
Hollis Blanchard
69
80.23%
4
50.00%
Alexander Graf
11
12.79%
2
25.00%
Scott Wood
6
6.98%
2
25.00%
Total
86
100.00%
8
100.00%

/* Check pending exceptions and deliver one, if possible. */


int kvmppc_core_prepare_to_enter(struct kvm_vcpu *vcpu)
{
	int r = 0;
	WARN_ON_ONCE(!irqs_disabled());

	kvmppc_core_check_exceptions(vcpu);

	if (kvm_request_pending(vcpu)) {
		/* Exception delivery raised request; start over */
		return 1;
	}

	if (vcpu->arch.shared->msr & MSR_WE) {
		local_irq_enable();
		kvm_vcpu_block(vcpu);
		kvm_clear_request(KVM_REQ_UNHALT, vcpu);
		hard_irq_disable();

		kvmppc_set_exit_type(vcpu,