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Commit 65619eb5 authored by Eddie Dong's avatar Eddie Dong Committed by Avi Kivity
Browse files

KVM: In-kernel string pio write support 



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

Signed-off-by: default avatarYaozu (Eddie) Dong <eddie.dong@intel.com>
Signed-off-by: default avatarAvi Kivity <avi@qumranet.com>
parent 24cbc7e9

drivers/kvm/kvm_main.c

+37 −11
Original line number Diff line number Diff line
@@ -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);