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path: root/drivers/kvm/kvm_main.c
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Diffstat (limited to 'drivers/kvm/kvm_main.c')
-rw-r--r--drivers/kvm/kvm_main.c183
1 files changed, 168 insertions, 15 deletions
diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index ba7f43a4459..205998c141f 100644
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -346,6 +346,17 @@ static void kvm_free_physmem(struct kvm *kvm)
kvm_free_physmem_slot(&kvm->memslots[i], NULL);
}
+static void free_pio_guest_pages(struct kvm_vcpu *vcpu)
+{
+ int i;
+
+ for (i = 0; i < 2; ++i)
+ if (vcpu->pio.guest_pages[i]) {
+ __free_page(vcpu->pio.guest_pages[i]);
+ vcpu->pio.guest_pages[i] = NULL;
+ }
+}
+
static void kvm_free_vcpu(struct kvm_vcpu *vcpu)
{
if (!vcpu->vmcs)
@@ -357,6 +368,9 @@ static void kvm_free_vcpu(struct kvm_vcpu *vcpu)
kvm_arch_ops->vcpu_free(vcpu);
free_page((unsigned long)vcpu->run);
vcpu->run = NULL;
+ free_page((unsigned long)vcpu->pio_data);
+ vcpu->pio_data = NULL;
+ free_pio_guest_pages(vcpu);
}
static void kvm_free_vcpus(struct kvm *kvm)
@@ -1550,44 +1564,168 @@ void kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
}
EXPORT_SYMBOL_GPL(kvm_emulate_cpuid);
-static void complete_pio(struct kvm_vcpu *vcpu)
+static int pio_copy_data(struct kvm_vcpu *vcpu)
{
- struct kvm_io *io = &vcpu->run->io;
+ void *p = vcpu->pio_data;
+ void *q;
+ unsigned bytes;
+ int nr_pages = vcpu->pio.guest_pages[1] ? 2 : 1;
+
+ kvm_arch_ops->vcpu_put(vcpu);
+ q = vmap(vcpu->pio.guest_pages, nr_pages, VM_READ|VM_WRITE,
+ PAGE_KERNEL);
+ if (!q) {
+ kvm_arch_ops->vcpu_load(vcpu);
+ free_pio_guest_pages(vcpu);
+ return -ENOMEM;
+ }
+ q += vcpu->pio.guest_page_offset;
+ bytes = vcpu->pio.size * vcpu->pio.cur_count;
+ if (vcpu->pio.in)
+ memcpy(q, p, bytes);
+ else
+ memcpy(p, q, bytes);
+ q -= vcpu->pio.guest_page_offset;
+ vunmap(q);
+ kvm_arch_ops->vcpu_load(vcpu);
+ free_pio_guest_pages(vcpu);
+ return 0;
+}
+
+static int complete_pio(struct kvm_vcpu *vcpu)
+{
+ struct kvm_pio_request *io = &vcpu->pio;
long delta;
+ int r;
kvm_arch_ops->cache_regs(vcpu);
if (!io->string) {
- if (io->direction == KVM_EXIT_IO_IN)
- memcpy(&vcpu->regs[VCPU_REGS_RAX], &io->value,
+ if (io->in)
+ memcpy(&vcpu->regs[VCPU_REGS_RAX], vcpu->pio_data,
io->size);
} else {
+ if (io->in) {
+ r = pio_copy_data(vcpu);
+ if (r) {
+ kvm_arch_ops->cache_regs(vcpu);
+ return r;
+ }
+ }
+
delta = 1;
if (io->rep) {
- delta *= io->count;
+ delta *= io->cur_count;
/*
* The size of the register should really depend on
* current address size.
*/
vcpu->regs[VCPU_REGS_RCX] -= delta;
}
- if (io->string_down)
+ if (io->down)
delta = -delta;
delta *= io->size;
- if (io->direction == KVM_EXIT_IO_IN)
+ if (io->in)
vcpu->regs[VCPU_REGS_RDI] += delta;
else
vcpu->regs[VCPU_REGS_RSI] += delta;
}
- vcpu->pio_pending = 0;
vcpu->run->io_completed = 0;
kvm_arch_ops->decache_regs(vcpu);
- kvm_arch_ops->skip_emulated_instruction(vcpu);
+ io->count -= io->cur_count;
+ io->cur_count = 0;
+
+ if (!io->count)
+ kvm_arch_ops->skip_emulated_instruction(vcpu);
+ return 0;
}
+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)
+{
+ unsigned now, in_page;
+ int i;
+ int nr_pages = 1;
+ struct page *page;
+
+ vcpu->run->exit_reason = KVM_EXIT_IO;
+ vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
+ vcpu->run->io.size = size;
+ vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
+ vcpu->run->io.count = count;
+ vcpu->run->io.port = port;
+ vcpu->pio.count = count;
+ vcpu->pio.cur_count = count;
+ vcpu->pio.size = size;
+ vcpu->pio.in = in;
+ vcpu->pio.string = string;
+ vcpu->pio.down = down;
+ vcpu->pio.guest_page_offset = offset_in_page(address);
+ vcpu->pio.rep = rep;
+
+ if (!string) {
+ kvm_arch_ops->cache_regs(vcpu);
+ memcpy(vcpu->pio_data, &vcpu->regs[VCPU_REGS_RAX], 4);
+ kvm_arch_ops->decache_regs(vcpu);
+ return 0;
+ }
+
+ if (!count) {
+ kvm_arch_ops->skip_emulated_instruction(vcpu);
+ return 1;
+ }
+
+ now = min(count, PAGE_SIZE / size);
+
+ if (!down)
+ in_page = PAGE_SIZE - offset_in_page(address);
+ else
+ in_page = offset_in_page(address) + size;
+ now = min(count, (unsigned long)in_page / size);
+ if (!now) {
+ /*
+ * String I/O straddles page boundary. Pin two guest pages
+ * so that we satisfy atomicity constraints. Do just one
+ * transaction to avoid complexity.
+ */
+ nr_pages = 2;
+ now = 1;
+ }
+ if (down) {
+ /*
+ * String I/O in reverse. Yuck. Kill the guest, fix later.
+ */
+ printk(KERN_ERR "kvm: guest string pio down\n");
+ inject_gp(vcpu);
+ return 1;
+ }
+ vcpu->run->io.count = now;
+ vcpu->pio.cur_count = now;
+
+ for (i = 0; i < nr_pages; ++i) {
+ spin_lock(&vcpu->kvm->lock);
+ page = gva_to_page(vcpu, address + i * PAGE_SIZE);
+ if (page)
+ get_page(page);
+ vcpu->pio.guest_pages[i] = page;
+ spin_unlock(&vcpu->kvm->lock);
+ if (!page) {
+ inject_gp(vcpu);
+ free_pio_guest_pages(vcpu);
+ return 1;
+ }
+ }
+
+ if (!vcpu->pio.in)
+ return pio_copy_data(vcpu);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(kvm_setup_pio);
+
static int kvm_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
int r;
@@ -1602,9 +1740,11 @@ static int kvm_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
vcpu->cr8 = kvm_run->cr8;
if (kvm_run->io_completed) {
- if (vcpu->pio_pending)
- complete_pio(vcpu);
- else {
+ if (vcpu->pio.cur_count) {
+ r = complete_pio(vcpu);
+ if (r)
+ goto out;
+ } else {
memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
vcpu->mmio_read_completed = 1;
}
@@ -1620,6 +1760,7 @@ static int kvm_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
r = kvm_arch_ops->run(vcpu, kvm_run);
+out:
if (vcpu->sigset_active)
sigprocmask(SIG_SETMASK, &sigsaved, NULL);
@@ -1995,9 +2136,12 @@ static struct page *kvm_vcpu_nopage(struct vm_area_struct *vma,
*type = VM_FAULT_MINOR;
pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
- if (pgoff != 0)
+ if (pgoff == 0)
+ page = virt_to_page(vcpu->run);
+ else if (pgoff == KVM_PIO_PAGE_OFFSET)
+ page = virt_to_page(vcpu->pio_data);
+ else
return NOPAGE_SIGBUS;
- page = virt_to_page(vcpu->run);
get_page(page);
return page;
}
@@ -2094,6 +2238,12 @@ static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, int n)
goto out_unlock;
vcpu->run = page_address(page);
+ page = alloc_page(GFP_KERNEL | __GFP_ZERO);
+ r = -ENOMEM;
+ if (!page)
+ goto out_free_run;
+ vcpu->pio_data = page_address(page);
+
vcpu->host_fx_image = (char*)ALIGN((hva_t)vcpu->fx_buf,
FX_IMAGE_ALIGN);
vcpu->guest_fx_image = vcpu->host_fx_image + FX_IMAGE_SIZE;
@@ -2123,6 +2273,9 @@ static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, int n)
out_free_vcpus:
kvm_free_vcpu(vcpu);
+out_free_run:
+ free_page((unsigned long)vcpu->run);
+ vcpu->run = NULL;
out_unlock:
mutex_unlock(&vcpu->mutex);
out:
@@ -2491,7 +2644,7 @@ static long kvm_dev_ioctl(struct file *filp,
r = -EINVAL;
if (arg)
goto out;
- r = PAGE_SIZE;
+ r = 2 * PAGE_SIZE;
break;
default:
;
generated by cgit v1.2.3 (git 2.25.1) at 2024-08-22 21:06:43 +0000