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Diffstat (limited to 'arch/riscv/kvm/vcpu.c')
-rw-r--r--arch/riscv/kvm/vcpu.c68
1 files changed, 48 insertions, 20 deletions
diff --git a/arch/riscv/kvm/vcpu.c b/arch/riscv/kvm/vcpu.c
index cf6e231e76e2..977e36ab83d3 100644
--- a/arch/riscv/kvm/vcpu.c
+++ b/arch/riscv/kvm/vcpu.c
@@ -80,6 +80,7 @@ static void kvm_riscv_vcpu_context_reset(struct kvm_vcpu *vcpu,
static void kvm_riscv_reset_vcpu(struct kvm_vcpu *vcpu, bool kvm_sbi_reset)
{
+ unsigned long flags;
bool loaded;
/**
@@ -104,8 +105,10 @@ static void kvm_riscv_reset_vcpu(struct kvm_vcpu *vcpu, bool kvm_sbi_reset)
kvm_riscv_vcpu_aia_reset(vcpu);
+ raw_spin_lock_irqsave(&vcpu->arch.irqs_pending_lock, flags);
bitmap_zero(vcpu->arch.irqs_pending, KVM_RISCV_VCPU_NR_IRQS);
bitmap_zero(vcpu->arch.irqs_pending_mask, KVM_RISCV_VCPU_NR_IRQS);
+ raw_spin_unlock_irqrestore(&vcpu->arch.irqs_pending_lock, flags);
kvm_riscv_vcpu_pmu_reset(vcpu);
@@ -151,6 +154,7 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
/* Setup VCPU hfence queue */
spin_lock_init(&vcpu->arch.hfence_lock);
+ raw_spin_lock_init(&vcpu->arch.irqs_pending_lock);
spin_lock_init(&vcpu->arch.reset_state.lock);
@@ -352,10 +356,14 @@ void kvm_riscv_vcpu_flush_interrupts(struct kvm_vcpu *vcpu)
{
struct kvm_vcpu_csr *csr = &vcpu->arch.guest_csr;
unsigned long mask, val;
+ unsigned long flags;
- if (READ_ONCE(vcpu->arch.irqs_pending_mask[0])) {
- mask = xchg_acquire(&vcpu->arch.irqs_pending_mask[0], 0);
- val = READ_ONCE(vcpu->arch.irqs_pending[0]) & mask;
+ raw_spin_lock_irqsave(&vcpu->arch.irqs_pending_lock, flags);
+
+ mask = vcpu->arch.irqs_pending_mask[0];
+ if (mask) {
+ vcpu->arch.irqs_pending_mask[0] = 0;
+ val = vcpu->arch.irqs_pending[0] & mask;
csr->hvip &= ~mask;
csr->hvip |= val;
@@ -363,11 +371,14 @@ void kvm_riscv_vcpu_flush_interrupts(struct kvm_vcpu *vcpu)
/* Flush AIA high interrupts */
kvm_riscv_vcpu_aia_flush_interrupts(vcpu);
+
+ raw_spin_unlock_irqrestore(&vcpu->arch.irqs_pending_lock, flags);
}
void kvm_riscv_vcpu_sync_interrupts(struct kvm_vcpu *vcpu)
{
unsigned long hvip;
+ unsigned long flags;
struct kvm_vcpu_arch *v = &vcpu->arch;
struct kvm_vcpu_csr *csr = &vcpu->arch.guest_csr;
@@ -376,34 +387,41 @@ void kvm_riscv_vcpu_sync_interrupts(struct kvm_vcpu *vcpu)
/* Sync-up HVIP.VSSIP bit changes does by Guest */
hvip = ncsr_read(CSR_HVIP);
+
+ raw_spin_lock_irqsave(&v->irqs_pending_lock, flags);
+
if ((csr->hvip ^ hvip) & (1UL << IRQ_VS_SOFT)) {
if (hvip & (1UL << IRQ_VS_SOFT)) {
- if (!test_and_set_bit(IRQ_VS_SOFT,
- v->irqs_pending_mask))
- set_bit(IRQ_VS_SOFT, v->irqs_pending);
+ if (!__test_and_set_bit(IRQ_VS_SOFT,
+ v->irqs_pending_mask))
+ __set_bit(IRQ_VS_SOFT, v->irqs_pending);
} else {
- if (!test_and_set_bit(IRQ_VS_SOFT,
- v->irqs_pending_mask))
- clear_bit(IRQ_VS_SOFT, v->irqs_pending);
+ if (!__test_and_set_bit(IRQ_VS_SOFT,
+ v->irqs_pending_mask))
+ __clear_bit(IRQ_VS_SOFT, v->irqs_pending);
}
}
/* Sync up the HVIP.LCOFIP bit changes (only clear) by the guest */
if ((csr->hvip ^ hvip) & (1UL << IRQ_PMU_OVF)) {
if (!(hvip & (1UL << IRQ_PMU_OVF)) &&
- !test_and_set_bit(IRQ_PMU_OVF, v->irqs_pending_mask))
- clear_bit(IRQ_PMU_OVF, v->irqs_pending);
+ !__test_and_set_bit(IRQ_PMU_OVF, v->irqs_pending_mask))
+ __clear_bit(IRQ_PMU_OVF, v->irqs_pending);
}
/* Sync-up AIA high interrupts */
kvm_riscv_vcpu_aia_sync_interrupts(vcpu);
+ raw_spin_unlock_irqrestore(&v->irqs_pending_lock, flags);
+
/* Sync-up timer CSRs */
kvm_riscv_vcpu_timer_sync(vcpu);
}
int kvm_riscv_vcpu_set_interrupt(struct kvm_vcpu *vcpu, unsigned int irq)
{
+ unsigned long flags;
+
/*
* We only allow VS-mode software, timer, and external
* interrupts when irq is one of the local interrupts
@@ -416,9 +434,10 @@ int kvm_riscv_vcpu_set_interrupt(struct kvm_vcpu *vcpu, unsigned int irq)
irq != IRQ_PMU_OVF)
return -EINVAL;
- set_bit(irq, vcpu->arch.irqs_pending);
- smp_mb__before_atomic();
- set_bit(irq, vcpu->arch.irqs_pending_mask);
+ raw_spin_lock_irqsave(&vcpu->arch.irqs_pending_lock, flags);
+ __set_bit(irq, vcpu->arch.irqs_pending);
+ __set_bit(irq, vcpu->arch.irqs_pending_mask);
+ raw_spin_unlock_irqrestore(&vcpu->arch.irqs_pending_lock, flags);
kvm_vcpu_kick(vcpu);
@@ -427,6 +446,8 @@ int kvm_riscv_vcpu_set_interrupt(struct kvm_vcpu *vcpu, unsigned int irq)
int kvm_riscv_vcpu_unset_interrupt(struct kvm_vcpu *vcpu, unsigned int irq)
{
+ unsigned long flags;
+
/*
* We only allow VS-mode software, timer, counter overflow and external
* interrupts when irq is one of the local interrupts
@@ -439,26 +460,33 @@ int kvm_riscv_vcpu_unset_interrupt(struct kvm_vcpu *vcpu, unsigned int irq)
irq != IRQ_PMU_OVF)
return -EINVAL;
- clear_bit(irq, vcpu->arch.irqs_pending);
- smp_mb__before_atomic();
- set_bit(irq, vcpu->arch.irqs_pending_mask);
+ raw_spin_lock_irqsave(&vcpu->arch.irqs_pending_lock, flags);
+ __clear_bit(irq, vcpu->arch.irqs_pending);
+ __set_bit(irq, vcpu->arch.irqs_pending_mask);
+ raw_spin_unlock_irqrestore(&vcpu->arch.irqs_pending_lock, flags);
return 0;
}
bool kvm_riscv_vcpu_has_interrupts(struct kvm_vcpu *vcpu, u64 mask)
{
+ unsigned long flags;
unsigned long ie;
+ bool ret;
+ raw_spin_lock_irqsave(&vcpu->arch.irqs_pending_lock, flags);
ie = ((vcpu->arch.guest_csr.vsie & VSIP_VALID_MASK)
<< VSIP_TO_HVIP_SHIFT) & (unsigned long)mask;
ie |= vcpu->arch.guest_csr.vsie & ~IRQ_LOCAL_MASK &
(unsigned long)mask;
- if (READ_ONCE(vcpu->arch.irqs_pending[0]) & ie)
- return true;
+ ret = vcpu->arch.irqs_pending[0] & ie;
+ raw_spin_unlock_irqrestore(&vcpu->arch.irqs_pending_lock, flags);
/* Check AIA high interrupts */
- return kvm_riscv_vcpu_aia_has_interrupts(vcpu, mask);
+ if (!ret)
+ ret = kvm_riscv_vcpu_aia_has_interrupts(vcpu, mask);
+
+ return ret;
}
void __kvm_riscv_vcpu_power_off(struct kvm_vcpu *vcpu)
generated by cgit v1.3.1 (git 2.54.0) at 2026-07-26 00:51:06 +0000