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KVM/arm fixes for 4.17, take #2

Browse Source 
- Fix proxying of GICv2 CPU interface accesses
 - Fix crash when switching to BE
 - Track source vcpu git GICv2 SGIs
 - Fix an outdated bit of documentation
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Merge tag 'kvmarm-fixes-for-4.17-2' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm

KVM/arm fixes for 4.17, take #2

- Fix proxying of GICv2 CPU interface accesses
- Fix crash when switching to BE
- Track source vcpu git GICv2 SGIs
- Fix an outdated bit of documentation
This commit is contained in:
Radim Krčmář 2018-05-05 23:05:31 +02:00
commit f3351c609b
9 changed files with 102 additions and 68 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/arm64/include/asm/kvm_emulate.h
View File

@ -333,7 +333,7 @@ static inline void kvm_vcpu_set_be(struct kvm_vcpu *vcpu)
} else {
u64 sctlr = vcpu_read_sys_reg(vcpu, SCTLR_EL1);
sctlr |= (1 << 25);
vcpu_write_sys_reg(vcpu, SCTLR_EL1, sctlr);
vcpu_write_sys_reg(vcpu, sctlr, SCTLR_EL1);
}
}

24
arch/arm64/kvm/hyp/vgic-v2-cpuif-proxy.c
View File

@ -18,11 +18,20 @@
#include <linux/compiler.h>
#include <linux/irqchip/arm-gic.h>
#include <linux/kvm_host.h>
#include <linux/swab.h>
#include <asm/kvm_emulate.h>
#include <asm/kvm_hyp.h>
#include <asm/kvm_mmu.h>
static bool __hyp_text __is_be(struct kvm_vcpu *vcpu)
{
if (vcpu_mode_is_32bit(vcpu))
return !!(read_sysreg_el2(spsr) & COMPAT_PSR_E_BIT);
return !!(read_sysreg(SCTLR_EL1) & SCTLR_ELx_EE);
}
/*
* __vgic_v2_perform_cpuif_access -- perform a GICV access on behalf of the
* guest.
@ -64,14 +73,19 @@ int __hyp_text __vgic_v2_perform_cpuif_access(struct kvm_vcpu *vcpu)
addr += fault_ipa - vgic->vgic_cpu_base;
if (kvm_vcpu_dabt_iswrite(vcpu)) {
u32 data = vcpu_data_guest_to_host(vcpu,
vcpu_get_reg(vcpu, rd),
sizeof(u32));
u32 data = vcpu_get_reg(vcpu, rd);
if (__is_be(vcpu)) {
/* guest pre-swabbed data, undo this for writel() */
data = swab32(data);
}
writel_relaxed(data, addr);
} else {
u32 data = readl_relaxed(addr);
vcpu_set_reg(vcpu, rd, vcpu_data_host_to_guest(vcpu, data,
sizeof(u32)));
if (__is_be(vcpu)) {
/* guest expects swabbed data */
data = swab32(data);
}
vcpu_set_reg(vcpu, rd, data);
}
return 1;

1
include/kvm/arm_vgic.h
View File

@ -131,6 +131,7 @@ struct vgic_irq {
u32 mpidr; /* GICv3 target VCPU */
};
u8 source; /* GICv2 SGIs only */
u8 active_source; /* GICv2 SGIs only */
u8 priority;
enum vgic_irq_config config; /* Level or edge */

2
virt/kvm/arm/vgic/vgic-init.c
View File

@ -423,7 +423,7 @@ static irqreturn_t vgic_maintenance_handler(int irq, void *data)
* We cannot rely on the vgic maintenance interrupt to be
* delivered synchronously. This means we can only use it to
* exit the VM, and we perform the handling of EOIed
* interrupts on the exit path (see vgic_process_maintenance).
* interrupts on the exit path (see vgic_fold_lr_state).
*/
return IRQ_HANDLED;
}

10
virt/kvm/arm/vgic/vgic-mmio.c
View File

@ -289,10 +289,16 @@ static void vgic_mmio_change_active(struct kvm_vcpu *vcpu, struct vgic_irq *irq,
irq->vcpu->cpu != -1) /* VCPU thread is running */
cond_resched_lock(&irq->irq_lock);
if (irq->hw)
if (irq->hw) {
vgic_hw_irq_change_active(vcpu, irq, active, !requester_vcpu);
else
} else {
u32 model = vcpu->kvm->arch.vgic.vgic_model;
irq->active = active;
if (model == KVM_DEV_TYPE_ARM_VGIC_V2 &&
active && vgic_irq_is_sgi(irq->intid))
irq->active_source = requester_vcpu->vcpu_id;
}
if (irq->active)
vgic_queue_irq_unlock(vcpu->kvm, irq, flags);

38
virt/kvm/arm/vgic/vgic-v2.c
View File

@ -37,13 +37,6 @@ 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;
@ -71,13 +64,18 @@ void vgic_v2_fold_lr_state(struct kvm_vcpu *vcpu)
int lr;
unsigned long flags;
cpuif->vgic_hcr &= ~(GICH_HCR_UIE | GICH_HCR_NPIE);
cpuif->vgic_hcr &= ~GICH_HCR_UIE;
for (lr = 0; lr < vgic_cpu->used_lrs; lr++) {
u32 val = cpuif->vgic_lr[lr];
u32 intid = val & GICH_LR_VIRTUALID;
u32 cpuid, intid = val & GICH_LR_VIRTUALID;
struct vgic_irq *irq;
/* Extract the source vCPU id from the LR */
cpuid = val & GICH_LR_PHYSID_CPUID;
cpuid >>= GICH_LR_PHYSID_CPUID_SHIFT;
cpuid &= 7;
/* Notify fds when the guest EOI'ed a level-triggered SPI */
if (lr_signals_eoi_mi(val) && vgic_valid_spi(vcpu->kvm, intid))
kvm_notify_acked_irq(vcpu->kvm, 0,
@ -90,17 +88,16 @@ void vgic_v2_fold_lr_state(struct kvm_vcpu *vcpu)
/* Always preserve the active bit */
irq->active = !!(val & GICH_LR_ACTIVE_BIT);
if (irq->active && vgic_irq_is_sgi(intid))
irq->active_source = cpuid;
/* Edge is the only case where we preserve the pending bit */
if (irq->config == VGIC_CONFIG_EDGE &&
(val & GICH_LR_PENDING_BIT)) {
irq->pending_latch = true;
if (vgic_irq_is_sgi(intid)) {
u32 cpuid = val & GICH_LR_PHYSID_CPUID;
cpuid >>= GICH_LR_PHYSID_CPUID_SHIFT;
if (vgic_irq_is_sgi(intid))
irq->source |= (1 << cpuid);
}
}
/*
@ -152,8 +149,15 @@ void vgic_v2_populate_lr(struct kvm_vcpu *vcpu, struct vgic_irq *irq, int lr)
u32 val = irq->intid;
bool allow_pending = true;
if (irq->active)
if (irq->active) {
val |= GICH_LR_ACTIVE_BIT;
if (vgic_irq_is_sgi(irq->intid))
val |= irq->active_source << GICH_LR_PHYSID_CPUID_SHIFT;
if (vgic_irq_is_multi_sgi(irq)) {
allow_pending = false;
val |= GICH_LR_EOI;
}
}
if (irq->hw) {
val |= GICH_LR_HW;
@ -190,8 +194,10 @@ void vgic_v2_populate_lr(struct kvm_vcpu *vcpu, struct vgic_irq *irq, int lr)
BUG_ON(!src);
val |= (src - 1) << GICH_LR_PHYSID_CPUID_SHIFT;
irq->source &= ~(1 << (src - 1));
if (irq->source)
if (irq->source) {
irq->pending_latch = true;
val |= GICH_LR_EOI;
}
}
}

49
virt/kvm/arm/vgic/vgic-v3.c
View File

@ -27,13 +27,6 @@ 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;
@ -55,17 +48,23 @@ void vgic_v3_fold_lr_state(struct kvm_vcpu *vcpu)
int lr;
unsigned long flags;
cpuif->vgic_hcr &= ~(ICH_HCR_UIE | ICH_HCR_NPIE);
cpuif->vgic_hcr &= ~ICH_HCR_UIE;
for (lr = 0; lr < vgic_cpu->used_lrs; lr++) {
u64 val = cpuif->vgic_lr[lr];
u32 intid;
u32 intid, cpuid;
struct vgic_irq *irq;
bool is_v2_sgi = false;
if (model == KVM_DEV_TYPE_ARM_VGIC_V3)
cpuid = val & GICH_LR_PHYSID_CPUID;
cpuid >>= GICH_LR_PHYSID_CPUID_SHIFT;
if (model == KVM_DEV_TYPE_ARM_VGIC_V3) {
intid = val & ICH_LR_VIRTUAL_ID_MASK;
else
} else {
intid = val & GICH_LR_VIRTUALID;
is_v2_sgi = vgic_irq_is_sgi(intid);
}
/* Notify fds when the guest EOI'ed a level-triggered IRQ */
if (lr_signals_eoi_mi(val) && vgic_valid_spi(vcpu->kvm, intid))
@ -81,18 +80,16 @@ void vgic_v3_fold_lr_state(struct kvm_vcpu *vcpu)
/* Always preserve the active bit */
irq->active = !!(val & ICH_LR_ACTIVE_BIT);
if (irq->active && is_v2_sgi)
irq->active_source = cpuid;
/* Edge is the only case where we preserve the pending bit */
if (irq->config == VGIC_CONFIG_EDGE &&
(val & ICH_LR_PENDING_BIT)) {
irq->pending_latch = true;
if (vgic_irq_is_sgi(intid) &&
model == KVM_DEV_TYPE_ARM_VGIC_V2) {
u32 cpuid = val & GICH_LR_PHYSID_CPUID;
cpuid >>= GICH_LR_PHYSID_CPUID_SHIFT;
if (is_v2_sgi)
irq->source |= (1 << cpuid);
}
}
/*
@ -133,10 +130,20 @@ void vgic_v3_populate_lr(struct kvm_vcpu *vcpu, struct vgic_irq *irq, int lr)
{
u32 model = vcpu->kvm->arch.vgic.vgic_model;
u64 val = irq->intid;
bool allow_pending = true;
bool allow_pending = true, is_v2_sgi;
if (irq->active)
is_v2_sgi = (vgic_irq_is_sgi(irq->intid) &&
model == KVM_DEV_TYPE_ARM_VGIC_V2);
if (irq->active) {
val |= ICH_LR_ACTIVE_BIT;
if (is_v2_sgi)
val |= irq->active_source << GICH_LR_PHYSID_CPUID_SHIFT;
if (vgic_irq_is_multi_sgi(irq)) {
allow_pending = false;
val |= ICH_LR_EOI;
}
}
if (irq->hw) {
val |= ICH_LR_HW;
@ -174,8 +181,10 @@ void vgic_v3_populate_lr(struct kvm_vcpu *vcpu, struct vgic_irq *irq, int lr)
BUG_ON(!src);
val |= (src - 1) << GICH_LR_PHYSID_CPUID_SHIFT;
irq->source &= ~(1 << (src - 1));
if (irq->source)
if (irq->source) {
irq->pending_latch = true;
val |= ICH_LR_EOI;
}
}
}

30
virt/kvm/arm/vgic/vgic.c
View File

@ -725,14 +725,6 @@ 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,
bool *multi_sgi)
@ -746,17 +738,15 @@ static int compute_ap_list_depth(struct kvm_vcpu *vcpu,
DEBUG_SPINLOCK_BUG_ON(!spin_is_locked(&vgic_cpu->ap_list_lock));
list_for_each_entry(irq, &vgic_cpu->ap_list_head, ap_list) {
int w;
spin_lock(&irq->irq_lock);
/* GICv2 SGIs can count for more than one... */
if (vgic_irq_is_sgi(irq->intid) && irq->source) {
int w = hweight8(irq->source);
count += w;
*multi_sgi |= (w > 1);
} else {
count++;
}
w = vgic_irq_get_lr_count(irq);
spin_unlock(&irq->irq_lock);
count += w;
*multi_sgi |= (w > 1);
}
return count;
}
@ -767,7 +757,6 @@ 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;
bool npie = false;
bool multi_sgi;
u8 prio = 0xff;
@ -797,10 +786,8 @@ static void vgic_flush_lr_state(struct kvm_vcpu *vcpu)
if (likely(vgic_target_oracle(irq) == vcpu)) {
vgic_populate_lr(vcpu, irq, count++);
if (irq->source) {
npie = true;
if (irq->source)
prio = irq->priority;
}
}
spin_unlock(&irq->irq_lock);
@ -813,9 +800,6 @@ static void vgic_flush_lr_state(struct kvm_vcpu *vcpu)
}
}
if (npie)
vgic_set_npie(vcpu);
vcpu->arch.vgic_cpu.used_lrs = count;
/* Nuke remaining LRs */

14
virt/kvm/arm/vgic/vgic.h
View File

@ -110,6 +110,20 @@ static inline bool vgic_irq_is_mapped_level(struct vgic_irq *irq)
return irq->config == VGIC_CONFIG_LEVEL && irq->hw;
}
static inline int vgic_irq_get_lr_count(struct vgic_irq *irq)
{
/* Account for the active state as an interrupt */
if (vgic_irq_is_sgi(irq->intid) && irq->source)
return hweight8(irq->source) + irq->active;
return irq_is_pending(irq) || irq->active;
}
static inline bool vgic_irq_is_multi_sgi(struct vgic_irq *irq)
{
return vgic_irq_get_lr_count(irq) > 1;
}
/*
* This struct provides an intermediate representation of the fields contained
* in the GICH_VMCR and ICH_VMCR registers, such that code exporting the GIC