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KVM/arm fixes for 5.2, take #2

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- SVE cleanup killing a warning with ancient GCC versions
 - Don't report non-existent system registers to userspace
 - Fix memory leak when freeing the vgic ITS
 - Properly lower the interrupt on the emulated physical timer
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Merge tag 'kvmarm-fixes-for-5.2-2' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into HEAD

KVM/arm fixes for 5.2, take #2

- SVE cleanup killing a warning with ancient GCC versions
- Don't report non-existent system registers to userspace
- Fix memory leak when freeing the vgic ITS
- Properly lower the interrupt on the emulated physical timer
This commit is contained in:
Paolo Bonzini 2019-06-20 18:24:18 +02:00
commit b21e31b253
3 changed files with 47 additions and 24 deletions
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65
arch/arm64/kvm/guest.c
View File

@ -70,10 +70,8 @@ static u64 core_reg_offset_from_id(u64 id)
return id & ~(KVM_REG_ARCH_MASK | KVM_REG_SIZE_MASK | KVM_REG_ARM_CORE);
}
static int validate_core_offset(const struct kvm_vcpu *vcpu,
const struct kvm_one_reg *reg)
static int core_reg_size_from_offset(const struct kvm_vcpu *vcpu, u64 off)
{
u64 off = core_reg_offset_from_id(reg->id);
int size;
switch (off) {
@ -103,8 +101,7 @@ static int validate_core_offset(const struct kvm_vcpu *vcpu,
return -EINVAL;
}
if (KVM_REG_SIZE(reg->id) != size ||
!IS_ALIGNED(off, size / sizeof(__u32)))
if (!IS_ALIGNED(off, size / sizeof(__u32)))
return -EINVAL;
/*
@ -115,6 +112,21 @@ static int validate_core_offset(const struct kvm_vcpu *vcpu,
if (vcpu_has_sve(vcpu) && core_reg_offset_is_vreg(off))
return -EINVAL;
return size;
}
static int validate_core_offset(const struct kvm_vcpu *vcpu,
const struct kvm_one_reg *reg)
{
u64 off = core_reg_offset_from_id(reg->id);
int size = core_reg_size_from_offset(vcpu, off);
if (size < 0)
return -EINVAL;
if (KVM_REG_SIZE(reg->id) != size)
return -EINVAL;
return 0;
}
@ -207,13 +219,7 @@ out:
#define vq_word(vq) (((vq) - SVE_VQ_MIN) / 64)
#define vq_mask(vq) ((u64)1 << ((vq) - SVE_VQ_MIN) % 64)
static bool vq_present(
const u64 (*const vqs)[KVM_ARM64_SVE_VLS_WORDS],
unsigned int vq)
{
return (*vqs)[vq_word(vq)] & vq_mask(vq);
}
#define vq_present(vqs, vq) ((vqs)[vq_word(vq)] & vq_mask(vq))
static int get_sve_vls(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
{
@ -258,7 +264,7 @@ static int set_sve_vls(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
max_vq = 0;
for (vq = SVE_VQ_MIN; vq <= SVE_VQ_MAX; ++vq)
if (vq_present(&vqs, vq))
if (vq_present(vqs, vq))
max_vq = vq;
if (max_vq > sve_vq_from_vl(kvm_sve_max_vl))
@ -272,7 +278,7 @@ static int set_sve_vls(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
* maximum:
*/
for (vq = SVE_VQ_MIN; vq <= max_vq; ++vq)
if (vq_present(&vqs, vq) != sve_vq_available(vq))
if (vq_present(vqs, vq) != sve_vq_available(vq))
return -EINVAL;
/* Can't run with no vector lengths at all: */
@ -453,19 +459,34 @@ static int copy_core_reg_indices(const struct kvm_vcpu *vcpu,
{
unsigned int i;
int n = 0;
const u64 core_reg = KVM_REG_ARM64 | KVM_REG_SIZE_U64 | KVM_REG_ARM_CORE;
for (i = 0; i < sizeof(struct kvm_regs) / sizeof(__u32); i++) {
/*
* The KVM_REG_ARM64_SVE regs must be used instead of
* KVM_REG_ARM_CORE for accessing the FPSIMD V-registers on
* SVE-enabled vcpus:
*/
if (vcpu_has_sve(vcpu) && core_reg_offset_is_vreg(i))
u64 reg = KVM_REG_ARM64 | KVM_REG_ARM_CORE | i;
int size = core_reg_size_from_offset(vcpu, i);
if (size < 0)
continue;
switch (size) {
case sizeof(__u32):
reg |= KVM_REG_SIZE_U32;
break;
case sizeof(__u64):
reg |= KVM_REG_SIZE_U64;
break;
case sizeof(__uint128_t):
reg |= KVM_REG_SIZE_U128;
break;
default:
WARN_ON(1);
continue;
}
if (uindices) {
if (put_user(core_reg | i, uindices))
if (put_user(reg, uindices))
return -EFAULT;
uindices++;
}

5
virt/kvm/arm/arch_timer.c
View File

@ -321,14 +321,15 @@ static void kvm_timer_update_irq(struct kvm_vcpu *vcpu, bool new_level,
}
}
/* Only called for a fully emulated timer */
static void timer_emulate(struct arch_timer_context *ctx)
{
bool should_fire = kvm_timer_should_fire(ctx);
trace_kvm_timer_emulate(ctx, should_fire);
if (should_fire) {
kvm_timer_update_irq(ctx->vcpu, true, ctx);
if (should_fire != ctx->irq.level) {
kvm_timer_update_irq(ctx->vcpu, should_fire, ctx);
return;
}

1
virt/kvm/arm/vgic/vgic-its.c
View File

@ -1734,6 +1734,7 @@ static void vgic_its_destroy(struct kvm_device *kvm_dev)
mutex_unlock(&its->its_lock);
kfree(its);
kfree(kvm_dev);/* alloc by kvm_ioctl_create_device, free by .destroy */
}
static int vgic_its_has_attr_regs(struct kvm_device *dev,