Avi:
This is to add kernel string pio support which is used
by some of Windows version. The patch is developped on top
of lapic2 branch but should be fine to mainline head too.
thanks, eddie
commit ee682213bfd318d40bb6826e5273ce6724658b95
Author: root <[EMAIL PROTECTED](none)>
Date: Tue Jul 17 08:31:44 2007 +0800
Add string pio write support to support some version
of Windows.
Signed-off-by: Yaozu (Eddie) Dong <[EMAIL PROTECTED]>
diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index 2129ee8..a6a9590 100644
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -1873,18 +1873,35 @@ 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,
@@ -1892,7 +1909,7 @@ 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;
@@ -1919,15 +1936,12 @@ 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);
@@ -1975,9 +1989,21 @@ 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);
string_pio.patch
Description: string_pio.patch
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