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kvm/ppc/mpic: in-kernel MPIC emulation

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Hook the MPIC code up to the KVM interfaces, add locking, etc.

Signed-off-by: Scott Wood <scottwood@freescale.com>
[agraf: add stub function for kvmppc_mpic_set_epr, non-booke, 64bit]
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Scott Wood 2013-04-12 14:08:46 +00:00 committed by Alexander Graf
parent f0f5c481a9
commit 5df554ad5b
12 changed files with 693 additions and 219 deletions
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37
Documentation/virtual/kvm/devices/mpic.txt Normal file
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@ -0,0 +1,37 @@
MPIC interrupt controller
=========================
Device types supported:
KVM_DEV_TYPE_FSL_MPIC_20 Freescale MPIC v2.0
KVM_DEV_TYPE_FSL_MPIC_42 Freescale MPIC v4.2
Only one MPIC instance, of any type, may be instantiated. The created
MPIC will act as the system interrupt controller, connecting to each
vcpu's interrupt inputs.
Groups:
KVM_DEV_MPIC_GRP_MISC
Attributes:
KVM_DEV_MPIC_BASE_ADDR (rw, 64-bit)
Base address of the 256 KiB MPIC register space. Must be
naturally aligned. A value of zero disables the mapping.
Reset value is zero.
KVM_DEV_MPIC_GRP_REGISTER (rw, 32-bit)
Access an MPIC register, as if the access were made from the guest.
"attr" is the byte offset into the MPIC register space. Accesses
must be 4-byte aligned.
MSIs may be signaled by using this attribute group to write
to the relevant MSIIR.
KVM_DEV_MPIC_GRP_IRQ_ACTIVE (rw, 32-bit)
IRQ input line for each standard openpic source. 0 is inactive and 1
is active, regardless of interrupt sense.
For edge-triggered interrupts: Writing 1 is considered an activating
edge, and writing 0 is ignored. Reading returns 1 if a previously
signaled edge has not been acknowledged, and 0 otherwise.
"attr" is the IRQ number. IRQ numbers for standard sources are the
byte offset of the relevant IVPR from EIVPR0, divided by 32.

8
arch/powerpc/include/asm/kvm_host.h
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@ -361,6 +361,11 @@ struct kvmppc_slb {
#define KVMPPC_BOOKE_MAX_IAC 4
#define KVMPPC_BOOKE_MAX_DAC 2
/* KVMPPC_EPR_USER takes precedence over KVMPPC_EPR_KERNEL */
#define KVMPPC_EPR_NONE 0 /* EPR not supported */
#define KVMPPC_EPR_USER 1 /* exit to userspace to fill EPR */
#define KVMPPC_EPR_KERNEL 2 /* in-kernel irqchip */
struct kvmppc_booke_debug_reg {
u32 dbcr0;
u32 dbcr1;
@ -526,7 +531,7 @@ struct kvm_vcpu_arch {
u8 sane;
u8 cpu_type;
u8 hcall_needed;
u8 epr_enabled;
u8 epr_flags; /* KVMPPC_EPR_xxx */
u8 epr_needed;
u32 cpr0_cfgaddr; /* holds the last set cpr0_cfgaddr */
@ -593,5 +598,6 @@ struct kvm_vcpu_arch {
#define KVM_MMIO_REG_FQPR 0x0060
#define __KVM_HAVE_ARCH_WQP
#define __KVM_HAVE_CREATE_DEVICE
#endif /* __POWERPC_KVM_HOST_H__ */

17
arch/powerpc/include/asm/kvm_ppc.h
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@ -164,6 +164,8 @@ extern int kvmppc_prepare_to_enter(struct kvm_vcpu *vcpu);
extern int kvm_vm_ioctl_get_htab_fd(struct kvm *kvm, struct kvm_get_htab_fd *);
int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq);
/*
* Cuts out inst bits with ordering according to spec.
* That means the leftmost bit is zero. All given bits are included.
@ -245,6 +247,9 @@ int kvmppc_set_one_reg(struct kvm_vcpu *vcpu, u64 id, union kvmppc_one_reg *);
void kvmppc_set_pid(struct kvm_vcpu *vcpu, u32 pid);
struct openpic;
void kvmppc_mpic_put(struct openpic *opp);
#ifdef CONFIG_KVM_BOOK3S_64_HV
static inline void kvmppc_set_xics_phys(int cpu, unsigned long addr)
{
@ -270,6 +275,18 @@ static inline void kvmppc_set_epr(struct kvm_vcpu *vcpu, u32 epr)
#endif
}
#ifdef CONFIG_KVM_MPIC
void kvmppc_mpic_set_epr(struct kvm_vcpu *vcpu);
#else
static inline void kvmppc_mpic_set_epr(struct kvm_vcpu *vcpu)
{
}
#endif /* CONFIG_KVM_MPIC */
int kvm_vcpu_ioctl_config_tlb(struct kvm_vcpu *vcpu,
struct kvm_config_tlb *cfg);
int kvm_vcpu_ioctl_dirty_tlb(struct kvm_vcpu *vcpu,

8
arch/powerpc/include/uapi/asm/kvm.h
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@ -382,6 +382,14 @@ struct kvm_get_htab_header {
__u16 n_invalid;
};
/* Device control API: PPC-specific devices */
#define KVM_DEV_MPIC_GRP_MISC 1
#define KVM_DEV_MPIC_BASE_ADDR 0 /* 64-bit */
#define KVM_DEV_MPIC_GRP_REGISTER 2 /* 32-bit */
#define KVM_DEV_MPIC_GRP_IRQ_ACTIVE 3 /* 32-bit */
/* One-Reg API: PPC-specific registers */
#define KVM_REG_PPC_HIOR (KVM_REG_PPC | KVM_REG_SIZE_U64 | 0x1)
#define KVM_REG_PPC_IAC1 (KVM_REG_PPC | KVM_REG_SIZE_U64 | 0x2)
#define KVM_REG_PPC_IAC2 (KVM_REG_PPC | KVM_REG_SIZE_U64 | 0x3)

9
arch/powerpc/kvm/Kconfig
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@ -151,6 +151,15 @@ config KVM_E500MC
If unsure, say N.
config KVM_MPIC
bool "KVM in-kernel MPIC emulation"
depends on KVM
help
Enable support for emulating MPIC devices inside the
host kernel, rather than relying on userspace to emulate.
Currently, support is limited to certain versions of
Freescale's MPIC implementation.
source drivers/vhost/Kconfig
endif # VIRTUALIZATION

2
arch/powerpc/kvm/Makefile
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@ -103,6 +103,8 @@ kvm-book3s_32-objs := \
book3s_32_mmu.o
kvm-objs-$(CONFIG_KVM_BOOK3S_32) := $(kvm-book3s_32-objs)
kvm-objs-$(CONFIG_KVM_MPIC) += mpic.o
kvm-objs := $(kvm-objs-m) $(kvm-objs-y)
obj-$(CONFIG_KVM_440) += kvm.o

8
arch/powerpc/kvm/booke.c
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@ -346,7 +346,7 @@ static int kvmppc_booke_irqprio_deliver(struct kvm_vcpu *vcpu,
keep_irq = true;
}
if ((priority == BOOKE_IRQPRIO_EXTERNAL) && vcpu->arch.epr_enabled)
if ((priority == BOOKE_IRQPRIO_EXTERNAL) && vcpu->arch.epr_flags)
update_epr = true;
switch (priority) {
@ -427,8 +427,10 @@ static int kvmppc_booke_irqprio_deliver(struct kvm_vcpu *vcpu,
set_guest_esr(vcpu, vcpu->arch.queued_esr);
if (update_dear == true)
set_guest_dear(vcpu, vcpu->arch.queued_dear);
if (update_epr == true)
kvm_make_request(KVM_REQ_EPR_EXIT, vcpu);
if (update_epr == true) {
if (vcpu->arch.epr_flags & KVMPPC_EPR_USER)
kvm_make_request(KVM_REQ_EPR_EXIT, vcpu);
}
new_msr &= msr_mask;
#if defined(CONFIG_64BIT)

800
arch/powerpc/kvm/mpic.c
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File diff suppressed because it is too large Load Diff

12
arch/powerpc/kvm/powerpc.c
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@ -317,6 +317,7 @@ int kvm_dev_ioctl_check_extension(long ext)
case KVM_CAP_ENABLE_CAP:
case KVM_CAP_ONE_REG:
case KVM_CAP_IOEVENTFD:
case KVM_CAP_DEVICE_CTRL:
r = 1;
break;
#ifndef CONFIG_KVM_BOOK3S_64_HV
@ -762,7 +763,10 @@ static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
break;
case KVM_CAP_PPC_EPR:
r = 0;
vcpu->arch.epr_enabled = cap->args[0];
if (cap->args[0])
vcpu->arch.epr_flags |= KVMPPC_EPR_USER;
else
vcpu->arch.epr_flags &= ~KVMPPC_EPR_USER;
break;
#ifdef CONFIG_BOOKE
case KVM_CAP_PPC_BOOKE_WATCHDOG:
@ -908,6 +912,7 @@ static int kvm_vm_ioctl_get_pvinfo(struct kvm_ppc_pvinfo *pvinfo)
long kvm_arch_vm_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg)
{
struct kvm *kvm __maybe_unused = filp->private_data;
void __user *argp = (void __user *)arg;
long r;
@ -926,7 +931,6 @@ long kvm_arch_vm_ioctl(struct file *filp,
#ifdef CONFIG_PPC_BOOK3S_64
case KVM_CREATE_SPAPR_TCE: {
struct kvm_create_spapr_tce create_tce;
struct kvm *kvm = filp->private_data;
r = -EFAULT;
if (copy_from_user(&create_tce, argp, sizeof(create_tce)))
@ -938,7 +942,6 @@ long kvm_arch_vm_ioctl(struct file *filp,
#ifdef CONFIG_KVM_BOOK3S_64_HV
case KVM_ALLOCATE_RMA: {
struct kvm *kvm = filp->private_data;
struct kvm_allocate_rma rma;
r = kvm_vm_ioctl_allocate_rma(kvm, &rma);
@ -948,7 +951,6 @@ long kvm_arch_vm_ioctl(struct file *filp,
}
case KVM_PPC_ALLOCATE_HTAB: {
struct kvm *kvm = filp->private_data;
u32 htab_order;
r = -EFAULT;
@ -965,7 +967,6 @@ long kvm_arch_vm_ioctl(struct file *filp,
}
case KVM_PPC_GET_HTAB_FD: {
struct kvm *kvm = filp->private_data;
struct kvm_get_htab_fd ghf;
r = -EFAULT;
@ -978,7 +979,6 @@ long kvm_arch_vm_ioctl(struct file *filp,
#ifdef CONFIG_PPC_BOOK3S_64
case KVM_PPC_GET_SMMU_INFO: {
struct kvm *kvm = filp->private_data;
struct kvm_ppc_smmu_info info;
memset(&info, 0, sizeof(info));

2
include/linux/kvm_host.h
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@ -1099,6 +1099,8 @@ void kvm_device_get(struct kvm_device *dev);
void kvm_device_put(struct kvm_device *dev);
struct kvm_device *kvm_device_from_filp(struct file *filp);
extern struct kvm_device_ops kvm_mpic_ops;
#ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
static inline void kvm_vcpu_set_in_spin_loop(struct kvm_vcpu *vcpu, bool val)

3
include/uapi/linux/kvm.h
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@ -837,6 +837,9 @@ struct kvm_device_attr {
__u64 addr; /* userspace address of attr data */
};
#define KVM_DEV_TYPE_FSL_MPIC_20 1
#define KVM_DEV_TYPE_FSL_MPIC_42 2
/*
* ioctls for VM fds
*/

6
virt/kvm/kvm_main.c
View File

@ -2238,6 +2238,12 @@ static int kvm_ioctl_create_device(struct kvm *kvm,
int ret;
switch (cd->type) {
#ifdef CONFIG_KVM_MPIC
case KVM_DEV_TYPE_FSL_MPIC_20:
case KVM_DEV_TYPE_FSL_MPIC_42:
ops = &kvm_mpic_ops;
break;
#endif
default:
return -ENODEV;
}