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KVM/arm fixes for 5.3, take #2

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- Fix our system register reset so that we stop writing
   non-sensical values to them, and track which registers
   get reset instead.
 - Sync VMCR back from the GIC on WFI so that KVM has an
   exact vue of PMR.
 - Reevaluate state of HW-mapped, level triggered interrupts
   on enable.
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Merge tag 'kvmarm-fixes-for-5.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into HEAD

KVM/arm fixes for 5.3, take #2

- Fix our system register reset so that we stop writing
  non-sensical values to them, and track which registers
  get reset instead.
- Sync VMCR back from the GIC on WFI so that KVM has an
  exact vue of PMR.
- Reevaluate state of HW-mapped, level triggered interrupts
  on enable.
This commit is contained in:
Paolo Bonzini 2019-08-09 16:53:50 +02:00
commit a738b5e75b
9 changed files with 88 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
arch/arm/kvm/coproc.c
View File

@ -651,13 +651,22 @@ int kvm_handle_cp14_64(struct kvm_vcpu *vcpu, struct kvm_run *run)
}
static void reset_coproc_regs(struct kvm_vcpu *vcpu,
const struct coproc_reg *table, size_t num)
const struct coproc_reg *table, size_t num,
unsigned long *bmap)
{
unsigned long i;
for (i = 0; i < num; i++)
if (table[i].reset)
if (table[i].reset) {
int reg = table[i].reg;
table[i].reset(vcpu, &table[i]);
if (reg > 0 && reg < NR_CP15_REGS) {
set_bit(reg, bmap);
if (table[i].is_64bit)
set_bit(reg + 1, bmap);
}
}
}
static struct coproc_params decode_32bit_hsr(struct kvm_vcpu *vcpu)
@ -1432,17 +1441,15 @@ void kvm_reset_coprocs(struct kvm_vcpu *vcpu)
{
size_t num;
const struct coproc_reg *table;
/* Catch someone adding a register without putting in reset entry. */
memset(vcpu->arch.ctxt.cp15, 0x42, sizeof(vcpu->arch.ctxt.cp15));
DECLARE_BITMAP(bmap, NR_CP15_REGS) = { 0, };
/* Generic chip reset first (so target could override). */
reset_coproc_regs(vcpu, cp15_regs, ARRAY_SIZE(cp15_regs));
reset_coproc_regs(vcpu, cp15_regs, ARRAY_SIZE(cp15_regs), bmap);
table = get_target_table(vcpu->arch.target, &num);
reset_coproc_regs(vcpu, table, num);
reset_coproc_regs(vcpu, table, num, bmap);
for (num = 1; num < NR_CP15_REGS; num++)
WARN(vcpu_cp15(vcpu, num) == 0x42424242,
WARN(!test_bit(num, bmap),
"Didn't reset vcpu_cp15(vcpu, %zi)", num);
}

32
arch/arm64/kvm/sys_regs.c
View File

@ -632,7 +632,7 @@ static void reset_pmcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
*/
val = ((pmcr & ~ARMV8_PMU_PMCR_MASK)
| (ARMV8_PMU_PMCR_MASK & 0xdecafbad)) & (~ARMV8_PMU_PMCR_E);
__vcpu_sys_reg(vcpu, PMCR_EL0) = val;
__vcpu_sys_reg(vcpu, r->reg) = val;
}
static bool check_pmu_access_disabled(struct kvm_vcpu *vcpu, u64 flags)
@ -981,13 +981,13 @@ static bool access_pmuserenr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
/* Silly macro to expand the DBG{BCR,BVR,WVR,WCR}n_EL1 registers in one go */
#define DBG_BCR_BVR_WCR_WVR_EL1(n) \
{ SYS_DESC(SYS_DBGBVRn_EL1(n)), \
trap_bvr, reset_bvr, n, 0, get_bvr, set_bvr }, \
trap_bvr, reset_bvr, 0, 0, get_bvr, set_bvr }, \
{ SYS_DESC(SYS_DBGBCRn_EL1(n)), \
trap_bcr, reset_bcr, n, 0, get_bcr, set_bcr }, \
trap_bcr, reset_bcr, 0, 0, get_bcr, set_bcr }, \
{ SYS_DESC(SYS_DBGWVRn_EL1(n)), \
trap_wvr, reset_wvr, n, 0, get_wvr, set_wvr }, \
trap_wvr, reset_wvr, 0, 0, get_wvr, set_wvr }, \
{ SYS_DESC(SYS_DBGWCRn_EL1(n)), \
trap_wcr, reset_wcr, n, 0, get_wcr, set_wcr }
trap_wcr, reset_wcr, 0, 0, get_wcr, set_wcr }
/* Macro to expand the PMEVCNTRn_EL0 register */
#define PMU_PMEVCNTR_EL0(n) \
@ -1540,7 +1540,7 @@ static const struct sys_reg_desc sys_reg_descs[] = {
{ SYS_DESC(SYS_CSSELR_EL1), access_csselr, reset_unknown, CSSELR_EL1 },
{ SYS_DESC(SYS_CTR_EL0), access_ctr },
{ SYS_DESC(SYS_PMCR_EL0), access_pmcr, reset_pmcr, },
{ SYS_DESC(SYS_PMCR_EL0), access_pmcr, reset_pmcr, PMCR_EL0 },
{ SYS_DESC(SYS_PMCNTENSET_EL0), access_pmcnten, reset_unknown, PMCNTENSET_EL0 },
{ SYS_DESC(SYS_PMCNTENCLR_EL0), access_pmcnten, NULL, PMCNTENSET_EL0 },
{ SYS_DESC(SYS_PMOVSCLR_EL0), access_pmovs, NULL, PMOVSSET_EL0 },
@ -2254,13 +2254,19 @@ static int emulate_sys_reg(struct kvm_vcpu *vcpu,
}
static void reset_sys_reg_descs(struct kvm_vcpu *vcpu,
const struct sys_reg_desc *table, size_t num)
const struct sys_reg_desc *table, size_t num,
unsigned long *bmap)
{
unsigned long i;
for (i = 0; i < num; i++)
if (table[i].reset)
if (table[i].reset) {
int reg = table[i].reg;
table[i].reset(vcpu, &table[i]);
if (reg > 0 && reg < NR_SYS_REGS)
set_bit(reg, bmap);
}
}
/**
@ -2774,18 +2780,16 @@ void kvm_reset_sys_regs(struct kvm_vcpu *vcpu)
{
size_t num;
const struct sys_reg_desc *table;
/* Catch someone adding a register without putting in reset entry. */
memset(&vcpu->arch.ctxt.sys_regs, 0x42, sizeof(vcpu->arch.ctxt.sys_regs));
DECLARE_BITMAP(bmap, NR_SYS_REGS) = { 0, };
/* Generic chip reset first (so target could override). */
reset_sys_reg_descs(vcpu, sys_reg_descs, ARRAY_SIZE(sys_reg_descs));
reset_sys_reg_descs(vcpu, sys_reg_descs, ARRAY_SIZE(sys_reg_descs), bmap);
table = get_target_table(vcpu->arch.target, true, &num);
reset_sys_reg_descs(vcpu, table, num);
reset_sys_reg_descs(vcpu, table, num, bmap);
for (num = 1; num < NR_SYS_REGS; num++) {
if (WARN(__vcpu_sys_reg(vcpu, num) == 0x4242424242424242,
if (WARN(!test_bit(num, bmap),
"Didn't reset __vcpu_sys_reg(%zi)\n", num))
break;
}

1
include/kvm/arm_vgic.h
View File

@ -350,6 +350,7 @@ int kvm_vgic_vcpu_pending_irq(struct kvm_vcpu *vcpu);
void kvm_vgic_load(struct kvm_vcpu *vcpu);
void kvm_vgic_put(struct kvm_vcpu *vcpu);
void kvm_vgic_vmcr_sync(struct kvm_vcpu *vcpu);
#define irqchip_in_kernel(k) (!!((k)->arch.vgic.in_kernel))
#define vgic_initialized(k) ((k)->arch.vgic.initialized)

11
virt/kvm/arm/arm.c
View File

@ -318,6 +318,17 @@ int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu)
{
/*
* If we're about to block (most likely because we've just hit a
* WFI), we need to sync back the state of the GIC CPU interface
* so that we have the lastest PMR and group enables. This ensures
* that kvm_arch_vcpu_runnable has up-to-date data to decide
* whether we have pending interrupts.
*/
preempt_disable();
kvm_vgic_vmcr_sync(vcpu);
preempt_enable();
kvm_vgic_v4_enable_doorbell(vcpu);
}

16
virt/kvm/arm/vgic/vgic-mmio.c
View File

@ -113,6 +113,22 @@ void vgic_mmio_write_senable(struct kvm_vcpu *vcpu,
struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
raw_spin_lock_irqsave(&irq->irq_lock, flags);
if (vgic_irq_is_mapped_level(irq)) {
bool was_high = irq->line_level;
/*
* We need to update the state of the interrupt because
* the guest might have changed the state of the device
* while the interrupt was disabled at the VGIC level.
*/
irq->line_level = vgic_get_phys_line_level(irq);
/*
* Deactivate the physical interrupt so the GIC will let
* us know when it is asserted again.
*/
if (!irq->active && was_high && !irq->line_level)
vgic_irq_set_phys_active(irq, false);
}
irq->enabled = true;
vgic_queue_irq_unlock(vcpu->kvm, irq, flags);

9
virt/kvm/arm/vgic/vgic-v2.c
View File

@ -484,10 +484,17 @@ void vgic_v2_load(struct kvm_vcpu *vcpu)
kvm_vgic_global_state.vctrl_base + GICH_APR);
}
void vgic_v2_put(struct kvm_vcpu *vcpu)
void vgic_v2_vmcr_sync(struct kvm_vcpu *vcpu)
{
struct vgic_v2_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v2;
cpu_if->vgic_vmcr = readl_relaxed(kvm_vgic_global_state.vctrl_base + GICH_VMCR);
}
void vgic_v2_put(struct kvm_vcpu *vcpu)
{
struct vgic_v2_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v2;
vgic_v2_vmcr_sync(vcpu);
cpu_if->vgic_apr = readl_relaxed(kvm_vgic_global_state.vctrl_base + GICH_APR);
}

7
virt/kvm/arm/vgic/vgic-v3.c
View File

@ -662,12 +662,17 @@ void vgic_v3_load(struct kvm_vcpu *vcpu)
__vgic_v3_activate_traps(vcpu);
}
void vgic_v3_put(struct kvm_vcpu *vcpu)
void vgic_v3_vmcr_sync(struct kvm_vcpu *vcpu)
{
struct vgic_v3_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v3;
if (likely(cpu_if->vgic_sre))
cpu_if->vgic_vmcr = kvm_call_hyp_ret(__vgic_v3_read_vmcr);
}
void vgic_v3_put(struct kvm_vcpu *vcpu)
{
vgic_v3_vmcr_sync(vcpu);
kvm_call_hyp(__vgic_v3_save_aprs, vcpu);

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

@ -919,6 +919,17 @@ void kvm_vgic_put(struct kvm_vcpu *vcpu)
vgic_v3_put(vcpu);
}
void kvm_vgic_vmcr_sync(struct kvm_vcpu *vcpu)
{
if (unlikely(!irqchip_in_kernel(vcpu->kvm)))
return;
if (kvm_vgic_global_state.type == VGIC_V2)
vgic_v2_vmcr_sync(vcpu);
else
vgic_v3_vmcr_sync(vcpu);
}
int kvm_vgic_vcpu_pending_irq(struct kvm_vcpu *vcpu)
{
struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;

2
virt/kvm/arm/vgic/vgic.h
View File

@ -193,6 +193,7 @@ int vgic_register_dist_iodev(struct kvm *kvm, gpa_t dist_base_address,
void vgic_v2_init_lrs(void);
void vgic_v2_load(struct kvm_vcpu *vcpu);
void vgic_v2_put(struct kvm_vcpu *vcpu);
void vgic_v2_vmcr_sync(struct kvm_vcpu *vcpu);
void vgic_v2_save_state(struct kvm_vcpu *vcpu);
void vgic_v2_restore_state(struct kvm_vcpu *vcpu);
@ -223,6 +224,7 @@ bool vgic_v3_check_base(struct kvm *kvm);
void vgic_v3_load(struct kvm_vcpu *vcpu);
void vgic_v3_put(struct kvm_vcpu *vcpu);
void vgic_v3_vmcr_sync(struct kvm_vcpu *vcpu);
bool vgic_has_its(struct kvm *kvm);
int kvm_vgic_register_its_device(void);