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| author | Eddie Dong <eddie.dong@intel.com> | 2007-06-19 18:05:03 +0300 |
|---|---|---|
| committer | Avi Kivity <avi@qumranet.com> | 2007-07-16 12:05:48 +0300 |
| commit | 74906345ff9f84f2b3b772d368c7e49f4ba27456 (patch) | |
| tree | c7da7fb64d076e8350233f6d0c3fb8e53a53566f /drivers/kvm/kvm_main.c | |
| parent | ff1dc7942ba8fa4a86619bcb37ed68afae1f69ca (diff) | |
| download | lwn-74906345ff9f84f2b3b772d368c7e49f4ba27456.tar.gz lwn-74906345ff9f84f2b3b772d368c7e49f4ba27456.zip | |
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>
Diffstat (limited to 'drivers/kvm/kvm_main.c')
| -rw-r--r-- | drivers/kvm/kvm_main.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c index e157e282fcff..7826f16271e5 100644 --- a/drivers/kvm/kvm_main.c +++ b/drivers/kvm/kvm_main.c @@ -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); |