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KVM: Add support for in-kernel pio handlers 

Useful for the PIC and PIT.

Signed-off-by: Yaozu (Eddie) Dong <eddie.dong@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Eddie Dong 2007-06-19 18:05:03 +03:00 committed by Avi Kivity
parent ff1dc7942b
commit 74906345ff
2 changed files with 37 additions and 1 deletions
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5
drivers/kvm/kvm.h
View File

@ -241,6 +241,7 @@ struct kvm_pio_request {
struct page *guest_pages[2];
unsigned guest_page_offset;
int in;
int port;
int size;
int string;
int down;
@ -303,7 +304,8 @@ static inline int kvm_iodevice_inrange(struct kvm_io_device *dev, gpa_t addr)
static inline void kvm_iodevice_destructor(struct kvm_io_device *dev)
{
dev->destructor(dev);
if (dev->destructor)
dev->destructor(dev);
}
/*
@ -453,6 +455,7 @@ struct kvm {
struct list_head vm_list;
struct file *filp;
struct kvm_io_bus mmio_bus;
struct kvm_io_bus pio_bus;
};
struct descriptor_table {

33
drivers/kvm/kvm_main.c
View File

@ -361,6 +361,7 @@ static struct kvm *kvm_create_vm(void)
if (!kvm)
return ERR_PTR(-ENOMEM);
kvm_io_bus_init(&kvm->pio_bus);
spin_lock_init(&kvm->lock);
INIT_LIST_HEAD(&kvm->active_mmu_pages);
spin_lock(&kvm_lock);
@ -475,6 +476,7 @@ static void kvm_destroy_vm(struct kvm *kvm)
spin_lock(&kvm_lock);
list_del(&kvm->vm_list);
spin_unlock(&kvm_lock);
kvm_io_bus_destroy(&kvm->pio_bus);
kvm_io_bus_destroy(&kvm->mmio_bus);
kvm_free_vcpus(kvm);
kvm_free_physmem(kvm);
@ -1110,6 +1112,12 @@ static struct kvm_io_device *vcpu_find_mmio_dev(struct kvm_vcpu *vcpu,
return kvm_io_bus_find_dev(&vcpu->kvm->mmio_bus, addr);
}
static struct kvm_io_device *vcpu_find_pio_dev(struct kvm_vcpu *vcpu,
gpa_t addr)
{
return kvm_io_bus_find_dev(&vcpu->kvm->pio_bus, addr);
}
static int emulator_read_emulated(unsigned long addr,
void *val,
unsigned int bytes,
@ -1832,6 +1840,20 @@ static int complete_pio(struct kvm_vcpu *vcpu)
return 0;
}
void kernel_pio(struct kvm_io_device *pio_dev, struct kvm_vcpu *vcpu)
{
/* TODO: String I/O for in kernel device */
if (vcpu->pio.in)
kvm_iodevice_read(pio_dev, vcpu->pio.port,
vcpu->pio.size,
vcpu->pio_data);
else
kvm_iodevice_write(pio_dev, vcpu->pio.port,
vcpu->pio.size,
vcpu->pio_data);
}
int kvm_setup_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
int size, unsigned long count, int string, int down,
gva_t address, int rep, unsigned port)
@ -1840,6 +1862,7 @@ int kvm_setup_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
int i;
int nr_pages = 1;
struct page *page;
struct kvm_io_device *pio_dev;
vcpu->run->exit_reason = KVM_EXIT_IO;
vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
@ -1851,17 +1874,27 @@ int kvm_setup_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
vcpu->pio.cur_count = count;
vcpu->pio.size = size;
vcpu->pio.in = in;
vcpu->pio.port = port;
vcpu->pio.string = string;
vcpu->pio.down = down;
vcpu->pio.guest_page_offset = offset_in_page(address);
vcpu->pio.rep = rep;
pio_dev = vcpu_find_pio_dev(vcpu, port);
if (!string) {
kvm_arch_ops->cache_regs(vcpu);
memcpy(vcpu->pio_data, &vcpu->regs[VCPU_REGS_RAX], 4);
kvm_arch_ops->decache_regs(vcpu);
if (pio_dev) {
kernel_pio(pio_dev, vcpu);
complete_pio(vcpu);
return 1;
}
return 0;
}
/* TODO: String I/O for in kernel device */
if (pio_dev)
printk(KERN_ERR "kvm_setup_pio: no string io support\n");
if (!count) {
kvm_arch_ops->skip_emulated_instruction(vcpu);