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KVM: In-kernel string pio write support 

Add string pio write support to support some version of Windows.

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 2007-07-17 11:52:33 +03:00 committed by Avi Kivity
parent 24cbc7e9cb
commit 65619eb5a8
1 changed files with 37 additions and 11 deletions
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48
drivers/kvm/kvm_main.c
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@ -1760,18 +1760,35 @@ static int complete_pio(struct kvm_vcpu *vcpu)
return 0;
}
void kernel_pio(struct kvm_io_device *pio_dev, struct kvm_vcpu *vcpu)
static void kernel_pio(struct kvm_io_device *pio_dev,
struct kvm_vcpu *vcpu,
void *pd)
{
/* 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);
pd);
else
kvm_iodevice_write(pio_dev, vcpu->pio.port,
vcpu->pio.size,
vcpu->pio_data);
pd);
}
static void pio_string_write(struct kvm_io_device *pio_dev,
struct kvm_vcpu *vcpu)
{
struct kvm_pio_request *io = &vcpu->pio;
void *pd = vcpu->pio_data;
int i;
for (i = 0; i < io->cur_count; i++) {
kvm_iodevice_write(pio_dev, io->port,
io->size,
pd);
pd += io->size;
}
}
int kvm_setup_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
@ -1779,7 +1796,7 @@ int kvm_setup_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
gva_t address, int rep, unsigned port)
{
unsigned now, in_page;
int i;
int i, ret = 0;
int nr_pages = 1;
struct page *page;
struct kvm_io_device *pio_dev;
@ -1806,15 +1823,12 @@ int kvm_setup_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
memcpy(vcpu->pio_data, &vcpu->regs[VCPU_REGS_RAX], 4);
kvm_arch_ops->decache_regs(vcpu);
if (pio_dev) {
kernel_pio(pio_dev, vcpu);
kernel_pio(pio_dev, vcpu, vcpu->pio_data);
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);
@ -1862,9 +1876,21 @@ int kvm_setup_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
}
}
if (!vcpu->pio.in)
return pio_copy_data(vcpu);
return 0;
if (!vcpu->pio.in) {
/* string PIO write */
ret = pio_copy_data(vcpu);
if (ret >= 0 && pio_dev) {
pio_string_write(pio_dev, vcpu);
complete_pio(vcpu);
if (vcpu->pio.count == 0)
ret = 1;
}
} else if (pio_dev)
printk(KERN_ERR "no string pio read support yet, "
"port %x size %d count %ld\n",
port, size, count);
return ret;
}
EXPORT_SYMBOL_GPL(kvm_setup_pio);