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KVM: arm/arm64: vgic-its: Implement KVM_DEV_ARM_ITS_CTRL_RESET 

On reset we clear the valid bits of GITS_CBASER and GITS_BASER<n>.
We also clear command queue registers and free the cache (device,
collection, and lpi lists).

As we need to take the same locks as save/restore functions, we
create a vgic_its_ctrl() wrapper that handles KVM_DEV_ARM_VGIC_GRP_CTRL
group functions.

Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
This commit is contained in:
Eric Auger 2017-10-26 17:23:11 +02:00 committed by Christoffer Dall
parent ae204f80ca
commit 3eb4271b4a
3 changed files with 58 additions and 49 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/arm/include/uapi/asm/kvm.h
View File

@ -221,6 +221,7 @@ struct kvm_arch_memory_slot {
#define KVM_DEV_ARM_ITS_SAVE_TABLES 1
#define KVM_DEV_ARM_ITS_RESTORE_TABLES 2
#define KVM_DEV_ARM_VGIC_SAVE_PENDING_TABLES 3
#define KVM_DEV_ARM_ITS_CTRL_RESET 4
/* KVM_IRQ_LINE irq field index values */
#define KVM_ARM_IRQ_TYPE_SHIFT 24

1
arch/arm64/include/uapi/asm/kvm.h
View File

@ -233,6 +233,7 @@ struct kvm_arch_memory_slot {
#define KVM_DEV_ARM_ITS_SAVE_TABLES 1
#define KVM_DEV_ARM_ITS_RESTORE_TABLES 2
#define KVM_DEV_ARM_VGIC_SAVE_PENDING_TABLES 3
#define KVM_DEV_ARM_ITS_CTRL_RESET 4
/* Device Control API on vcpu fd */
#define KVM_ARM_VCPU_PMU_V3_CTRL 0

105
virt/kvm/arm/vgic/vgic-its.c
View File

@ -2273,29 +2273,13 @@ static int vgic_its_restore_collection_table(struct vgic_its *its)
*/
static int vgic_its_save_tables_v0(struct vgic_its *its)
{
struct kvm *kvm = its->dev->kvm;
int ret;
mutex_lock(&kvm->lock);
mutex_lock(&its->its_lock);
if (!lock_all_vcpus(kvm)) {
mutex_unlock(&its->its_lock);
mutex_unlock(&kvm->lock);
return -EBUSY;
}
ret = vgic_its_save_device_tables(its);
if (ret)
goto out;
return ret;
ret = vgic_its_save_collection_table(its);
out:
unlock_all_vcpus(kvm);
mutex_unlock(&its->its_lock);
mutex_unlock(&kvm->lock);
return ret;
return vgic_its_save_collection_table(its);
}
/**
@ -2305,29 +2289,13 @@ out:
*/
static int vgic_its_restore_tables_v0(struct vgic_its *its)
{
struct kvm *kvm = its->dev->kvm;
int ret;
mutex_lock(&kvm->lock);
mutex_lock(&its->its_lock);
if (!lock_all_vcpus(kvm)) {
mutex_unlock(&its->its_lock);
mutex_unlock(&kvm->lock);
return -EBUSY;
}
ret = vgic_its_restore_collection_table(its);
if (ret)
goto out;
return ret;
ret = vgic_its_restore_device_tables(its);
out:
unlock_all_vcpus(kvm);
mutex_unlock(&its->its_lock);
mutex_unlock(&kvm->lock);
return ret;
return vgic_its_restore_device_tables(its);
}
static int vgic_its_commit_v0(struct vgic_its *its)
@ -2346,6 +2314,19 @@ static int vgic_its_commit_v0(struct vgic_its *its)
return 0;
}
static void vgic_its_reset(struct kvm *kvm, struct vgic_its *its)
{
/* We need to keep the ABI specific field values */
its->baser_coll_table &= ~GITS_BASER_VALID;
its->baser_device_table &= ~GITS_BASER_VALID;
its->cbaser = 0;
its->creadr = 0;
its->cwriter = 0;
its->enabled = 0;
vgic_its_free_device_list(kvm, its);
vgic_its_free_collection_list(kvm, its);
}
static int vgic_its_has_attr(struct kvm_device *dev,
struct kvm_device_attr *attr)
{
@ -2360,6 +2341,8 @@ static int vgic_its_has_attr(struct kvm_device *dev,
switch (attr->attr) {
case KVM_DEV_ARM_VGIC_CTRL_INIT:
return 0;
case KVM_DEV_ARM_ITS_CTRL_RESET:
return 0;
case KVM_DEV_ARM_ITS_SAVE_TABLES:
return 0;
case KVM_DEV_ARM_ITS_RESTORE_TABLES:
@ -2372,6 +2355,41 @@ static int vgic_its_has_attr(struct kvm_device *dev,
return -ENXIO;
}
static int vgic_its_ctrl(struct kvm *kvm, struct vgic_its *its, u64 attr)
{
const struct vgic_its_abi *abi = vgic_its_get_abi(its);
int ret = 0;
if (attr == KVM_DEV_ARM_VGIC_CTRL_INIT) /* Nothing to do */
return 0;
mutex_lock(&kvm->lock);
mutex_lock(&its->its_lock);
if (!lock_all_vcpus(kvm)) {
mutex_unlock(&its->its_lock);
mutex_unlock(&kvm->lock);
return -EBUSY;
}
switch (attr) {
case KVM_DEV_ARM_ITS_CTRL_RESET:
vgic_its_reset(kvm, its);
break;
case KVM_DEV_ARM_ITS_SAVE_TABLES:
ret = abi->save_tables(its);
break;
case KVM_DEV_ARM_ITS_RESTORE_TABLES:
ret = abi->restore_tables(its);
break;
}
unlock_all_vcpus(kvm);
mutex_unlock(&its->its_lock);
mutex_unlock(&kvm->lock);
return ret;
}
static int vgic_its_set_attr(struct kvm_device *dev,
struct kvm_device_attr *attr)
{
@ -2397,19 +2415,8 @@ static int vgic_its_set_attr(struct kvm_device *dev,
return vgic_register_its_iodev(dev->kvm, its, addr);
}
case KVM_DEV_ARM_VGIC_GRP_CTRL: {
const struct vgic_its_abi *abi = vgic_its_get_abi(its);
switch (attr->attr) {
case KVM_DEV_ARM_VGIC_CTRL_INIT:
/* Nothing to do */
return 0;
case KVM_DEV_ARM_ITS_SAVE_TABLES:
return abi->save_tables(its);
case KVM_DEV_ARM_ITS_RESTORE_TABLES:
return abi->restore_tables(its);
}
}
case KVM_DEV_ARM_VGIC_GRP_CTRL:
return vgic_its_ctrl(dev->kvm, its, attr->attr);
case KVM_DEV_ARM_VGIC_GRP_ITS_REGS: {
u64 __user *uaddr = (u64 __user *)(long)attr->addr;
u64 reg;