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kvm/arm fixes for 4.16, take 2

Browse Source 
- Peace of mind locking fix in vgic_mmio_read_pending
 - Allow hw-mapped interrupts to be reset when the VM resets
 - Fix GICv2 multi-source SGI injection
 - Fix MMIO synchronization for GICv2 on v3 emulation
 - Remove excess verbosity on the console
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Merge tag 'kvm-arm-fixes-for-v4.16-2' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into kvm-master

kvm/arm fixes for 4.16, take 2

- Peace of mind locking fix in vgic_mmio_read_pending
- Allow hw-mapped interrupts to be reset when the VM resets
- Fix GICv2 multi-source SGI injection
- Fix MMIO synchronization for GICv2 on v3 emulation
- Remove excess verbosity on the console
This commit is contained in:
Paolo Bonzini 2018-03-15 21:45:37 +01:00
commit bb9b4dbe0d
13 changed files with 110 additions and 35 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/arm64/kvm/guest.c
View File

@ -363,8 +363,6 @@ int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
{
int ret = 0;
vcpu_load(vcpu);
trace_kvm_set_guest_debug(vcpu, dbg->control);
if (dbg->control & ~KVM_GUESTDBG_VALID_MASK) {
@ -386,7 +384,6 @@ int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
}
out:
vcpu_put(vcpu);
return ret;
}

1
include/kvm/arm_vgic.h
View File

@ -360,6 +360,7 @@ void kvm_vgic_put(struct kvm_vcpu *vcpu);
bool kvm_vcpu_has_pending_irqs(struct kvm_vcpu *vcpu);
void kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu);
void kvm_vgic_flush_hwstate(struct kvm_vcpu *vcpu);
void kvm_vgic_reset_mapped_irq(struct kvm_vcpu *vcpu, u32 vintid);
void vgic_v3_dispatch_sgi(struct kvm_vcpu *vcpu, u64 reg);

1
include/linux/irqchip/arm-gic-v3.h
View File

@ -503,6 +503,7 @@
#define ICH_HCR_EN (1 << 0)
#define ICH_HCR_UIE (1 << 1)
#define ICH_HCR_NPIE (1 << 3)
#define ICH_HCR_TC (1 << 10)
#define ICH_HCR_TALL0 (1 << 11)
#define ICH_HCR_TALL1 (1 << 12)

1
include/linux/irqchip/arm-gic.h
View File

@ -84,6 +84,7 @@
#define GICH_HCR_EN (1 << 0)
#define GICH_HCR_UIE (1 << 1)
#define GICH_HCR_NPIE (1 << 3)
#define GICH_LR_VIRTUALID (0x3ff << 0)
#define GICH_LR_PHYSID_CPUID_SHIFT (10)

6
virt/kvm/arm/arch_timer.c
View File

@ -581,6 +581,7 @@ void kvm_timer_sync_hwstate(struct kvm_vcpu *vcpu)
int kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu)
{
struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
struct arch_timer_context *ptimer = vcpu_ptimer(vcpu);
@ -594,6 +595,9 @@ int kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu)
ptimer->cnt_ctl = 0;
kvm_timer_update_state(vcpu);
if (timer->enabled && irqchip_in_kernel(vcpu->kvm))
kvm_vgic_reset_mapped_irq(vcpu, vtimer->irq.irq);
return 0;
}
@ -767,7 +771,7 @@ int kvm_timer_hyp_init(bool has_gic)
static_branch_enable(&has_gic_active_state);
}
kvm_info("virtual timer IRQ%d\n", host_vtimer_irq);
kvm_debug("virtual timer IRQ%d\n", host_vtimer_irq);
cpuhp_setup_state(CPUHP_AP_KVM_ARM_TIMER_STARTING,
"kvm/arm/timer:starting", kvm_timer_starting_cpu,

9
virt/kvm/arm/arm.c
View File

@ -384,14 +384,11 @@ static void vcpu_power_off(struct kvm_vcpu *vcpu)
int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
struct kvm_mp_state *mp_state)
{
vcpu_load(vcpu);
if (vcpu->arch.power_off)
mp_state->mp_state = KVM_MP_STATE_STOPPED;
else
mp_state->mp_state = KVM_MP_STATE_RUNNABLE;
vcpu_put(vcpu);
return 0;
}
@ -400,8 +397,6 @@ int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
{
int ret = 0;
vcpu_load(vcpu);
switch (mp_state->mp_state) {
case KVM_MP_STATE_RUNNABLE:
vcpu->arch.power_off = false;
@ -413,7 +408,6 @@ int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
ret = -EINVAL;
}
vcpu_put(vcpu);
return ret;
}
@ -1036,8 +1030,6 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
struct kvm_device_attr attr;
long r;
vcpu_load(vcpu);
switch (ioctl) {
case KVM_ARM_VCPU_INIT: {
struct kvm_vcpu_init init;
@ -1114,7 +1106,6 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
r = -EINVAL;
}
vcpu_put(vcpu);
return r;
}

3
virt/kvm/arm/hyp/vgic-v3-sr.c
View File

@ -215,7 +215,8 @@ void __hyp_text __vgic_v3_save_state(struct kvm_vcpu *vcpu)
* are now visible to the system register interface.
*/
if (!cpu_if->vgic_sre) {
dsb(st);
dsb(sy);
isb();
cpu_if->vgic_vmcr = read_gicreg(ICH_VMCR_EL2);
}

6
virt/kvm/arm/mmu.c
View File

@ -1810,9 +1810,9 @@ int kvm_mmu_init(void)
*/
BUG_ON((hyp_idmap_start ^ (hyp_idmap_end - 1)) & PAGE_MASK);
kvm_info("IDMAP page: %lx\n", hyp_idmap_start);
kvm_info("HYP VA range: %lx:%lx\n",
kern_hyp_va(PAGE_OFFSET), kern_hyp_va(~0UL));
kvm_debug("IDMAP page: %lx\n", hyp_idmap_start);
kvm_debug("HYP VA range: %lx:%lx\n",
kern_hyp_va(PAGE_OFFSET), kern_hyp_va(~0UL));
if (hyp_idmap_start >= kern_hyp_va(PAGE_OFFSET) &&
hyp_idmap_start < kern_hyp_va(~0UL) &&

3
virt/kvm/arm/vgic/vgic-mmio.c
View File

@ -113,9 +113,12 @@ unsigned long vgic_mmio_read_pending(struct kvm_vcpu *vcpu,
/* Loop over all IRQs affected by this read */
for (i = 0; i < len * 8; i++) {
struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
unsigned long flags;
spin_lock_irqsave(&irq->irq_lock, flags);
if (irq_is_pending(irq))
value |= (1U << i);
spin_unlock_irqrestore(&irq->irq_lock, flags);
vgic_put_irq(vcpu->kvm, irq);
}

11
virt/kvm/arm/vgic/vgic-v2.c
View File

@ -37,6 +37,13 @@ void vgic_v2_init_lrs(void)
vgic_v2_write_lr(i, 0);
}
void vgic_v2_set_npie(struct kvm_vcpu *vcpu)
{
struct vgic_v2_cpu_if *cpuif = &vcpu->arch.vgic_cpu.vgic_v2;
cpuif->vgic_hcr |= GICH_HCR_NPIE;
}
void vgic_v2_set_underflow(struct kvm_vcpu *vcpu)
{
struct vgic_v2_cpu_if *cpuif = &vcpu->arch.vgic_cpu.vgic_v2;
@ -64,7 +71,7 @@ void vgic_v2_fold_lr_state(struct kvm_vcpu *vcpu)
int lr;
unsigned long flags;
cpuif->vgic_hcr &= ~GICH_HCR_UIE;
cpuif->vgic_hcr &= ~(GICH_HCR_UIE | GICH_HCR_NPIE);
for (lr = 0; lr < vgic_cpu->used_lrs; lr++) {
u32 val = cpuif->vgic_lr[lr];
@ -410,7 +417,7 @@ int vgic_v2_probe(const struct gic_kvm_info *info)
kvm_vgic_global_state.type = VGIC_V2;
kvm_vgic_global_state.max_gic_vcpus = VGIC_V2_MAX_CPUS;
kvm_info("vgic-v2@%llx\n", info->vctrl.start);
kvm_debug("vgic-v2@%llx\n", info->vctrl.start);
return 0;
out:

9
virt/kvm/arm/vgic/vgic-v3.c
View File

@ -26,6 +26,13 @@ static bool group1_trap;
static bool common_trap;
static bool gicv4_enable;
void vgic_v3_set_npie(struct kvm_vcpu *vcpu)
{
struct vgic_v3_cpu_if *cpuif = &vcpu->arch.vgic_cpu.vgic_v3;
cpuif->vgic_hcr |= ICH_HCR_NPIE;
}
void vgic_v3_set_underflow(struct kvm_vcpu *vcpu)
{
struct vgic_v3_cpu_if *cpuif = &vcpu->arch.vgic_cpu.vgic_v3;
@ -47,7 +54,7 @@ void vgic_v3_fold_lr_state(struct kvm_vcpu *vcpu)
int lr;
unsigned long flags;
cpuif->vgic_hcr &= ~ICH_HCR_UIE;
cpuif->vgic_hcr &= ~(ICH_HCR_UIE | ICH_HCR_NPIE);
for (lr = 0; lr < vgic_cpu->used_lrs; lr++) {
u64 val = cpuif->vgic_lr[lr];

89
virt/kvm/arm/vgic/vgic.c
View File

@ -495,6 +495,32 @@ int kvm_vgic_map_phys_irq(struct kvm_vcpu *vcpu, unsigned int host_irq,
return ret;
}
/**
* kvm_vgic_reset_mapped_irq - Reset a mapped IRQ
* @vcpu: The VCPU pointer
* @vintid: The INTID of the interrupt
*
* Reset the active and pending states of a mapped interrupt. Kernel
* subsystems injecting mapped interrupts should reset their interrupt lines
* when we are doing a reset of the VM.
*/
void kvm_vgic_reset_mapped_irq(struct kvm_vcpu *vcpu, u32 vintid)
{
struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, vintid);
unsigned long flags;
if (!irq->hw)
goto out;
spin_lock_irqsave(&irq->irq_lock, flags);
irq->active = false;
irq->pending_latch = false;
irq->line_level = false;
spin_unlock_irqrestore(&irq->irq_lock, flags);
out:
vgic_put_irq(vcpu->kvm, irq);
}
int kvm_vgic_unmap_phys_irq(struct kvm_vcpu *vcpu, unsigned int vintid)
{
struct vgic_irq *irq;
@ -684,22 +710,37 @@ static inline void vgic_set_underflow(struct kvm_vcpu *vcpu)
vgic_v3_set_underflow(vcpu);
}
static inline void vgic_set_npie(struct kvm_vcpu *vcpu)
{
if (kvm_vgic_global_state.type == VGIC_V2)
vgic_v2_set_npie(vcpu);
else
vgic_v3_set_npie(vcpu);
}
/* Requires the ap_list_lock to be held. */
static int compute_ap_list_depth(struct kvm_vcpu *vcpu)
static int compute_ap_list_depth(struct kvm_vcpu *vcpu,
bool *multi_sgi)
{
struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
struct vgic_irq *irq;
int count = 0;
*multi_sgi = false;
DEBUG_SPINLOCK_BUG_ON(!spin_is_locked(&vgic_cpu->ap_list_lock));
list_for_each_entry(irq, &vgic_cpu->ap_list_head, ap_list) {
spin_lock(&irq->irq_lock);
/* GICv2 SGIs can count for more than one... */
if (vgic_irq_is_sgi(irq->intid) && irq->source)
count += hweight8(irq->source);
else
if (vgic_irq_is_sgi(irq->intid) && irq->source) {
int w = hweight8(irq->source);
count += w;
*multi_sgi |= (w > 1);
} else {
count++;
}
spin_unlock(&irq->irq_lock);
}
return count;
@ -710,28 +751,43 @@ static void vgic_flush_lr_state(struct kvm_vcpu *vcpu)
{
struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
struct vgic_irq *irq;
int count = 0;
int count;
bool npie = false;
bool multi_sgi;
u8 prio = 0xff;
DEBUG_SPINLOCK_BUG_ON(!spin_is_locked(&vgic_cpu->ap_list_lock));
if (compute_ap_list_depth(vcpu) > kvm_vgic_global_state.nr_lr)
count = compute_ap_list_depth(vcpu, &multi_sgi);
if (count > kvm_vgic_global_state.nr_lr || multi_sgi)
vgic_sort_ap_list(vcpu);
count = 0;
list_for_each_entry(irq, &vgic_cpu->ap_list_head, ap_list) {
spin_lock(&irq->irq_lock);
if (unlikely(vgic_target_oracle(irq) != vcpu))
goto next;
/*
* If we get an SGI with multiple sources, try to get
* them in all at once.
* If we have multi-SGIs in the pipeline, we need to
* guarantee that they are all seen before any IRQ of
* lower priority. In that case, we need to filter out
* these interrupts by exiting early. This is easy as
* the AP list has been sorted already.
*/
do {
vgic_populate_lr(vcpu, irq, count++);
} while (irq->source && count < kvm_vgic_global_state.nr_lr);
if (multi_sgi && irq->priority > prio) {
spin_unlock(&irq->irq_lock);
break;
}
if (likely(vgic_target_oracle(irq) == vcpu)) {
vgic_populate_lr(vcpu, irq, count++);
if (irq->source) {
npie = true;
prio = irq->priority;
}
}
next:
spin_unlock(&irq->irq_lock);
if (count == kvm_vgic_global_state.nr_lr) {
@ -742,6 +798,9 @@ next:
}
}
if (npie)
vgic_set_npie(vcpu);
vcpu->arch.vgic_cpu.used_lrs = count;
/* Nuke remaining LRs */

3
virt/kvm/arm/vgic/vgic.h
View File

@ -96,6 +96,7 @@
/* we only support 64 kB translation table page size */
#define KVM_ITS_L1E_ADDR_MASK GENMASK_ULL(51, 16)
/* Requires the irq_lock to be held by the caller. */
static inline bool irq_is_pending(struct vgic_irq *irq)
{
if (irq->config == VGIC_CONFIG_EDGE)
@ -159,6 +160,7 @@ void vgic_v2_fold_lr_state(struct kvm_vcpu *vcpu);
void vgic_v2_populate_lr(struct kvm_vcpu *vcpu, struct vgic_irq *irq, int lr);
void vgic_v2_clear_lr(struct kvm_vcpu *vcpu, int lr);
void vgic_v2_set_underflow(struct kvm_vcpu *vcpu);
void vgic_v2_set_npie(struct kvm_vcpu *vcpu);
int vgic_v2_has_attr_regs(struct kvm_device *dev, struct kvm_device_attr *attr);
int vgic_v2_dist_uaccess(struct kvm_vcpu *vcpu, bool is_write,
int offset, u32 *val);
@ -188,6 +190,7 @@ void vgic_v3_fold_lr_state(struct kvm_vcpu *vcpu);
void vgic_v3_populate_lr(struct kvm_vcpu *vcpu, struct vgic_irq *irq, int lr);
void vgic_v3_clear_lr(struct kvm_vcpu *vcpu, int lr);
void vgic_v3_set_underflow(struct kvm_vcpu *vcpu);
void vgic_v3_set_npie(struct kvm_vcpu *vcpu);
void vgic_v3_set_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr);
void vgic_v3_get_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr);
void vgic_v3_enable(struct kvm_vcpu *vcpu);