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drm/i915/gvt: subsitute kvm_read/write_guest with vfio_dma_rw

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As a device model, it is better to read/write guest memory using vfio
interface, so that vfio is able to maintain dirty info of device IOVAs.

Cc: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Yan Zhao <yan.y.zhao@intel.com>
Reviewed-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20200313031109.7989-1-yan.y.zhao@intel.com
This commit is contained in:
Yan Zhao 2020-03-12 23:11:09 -04:00 committed by Zhenyu Wang
parent 776d95b768
commit b59b2a3ee5
1 changed files with 2 additions and 21 deletions
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23
drivers/gpu/drm/i915/gvt/kvmgt.c
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@ -2050,33 +2050,14 @@ static int kvmgt_rw_gpa(unsigned long handle, unsigned long gpa,
void *buf, unsigned long len, bool write)
{
struct kvmgt_guest_info *info;
struct kvm *kvm;
int idx, ret;
bool kthread = current->mm == NULL;
if (!handle_valid(handle))
return -ESRCH;
info = (struct kvmgt_guest_info *)handle;
kvm = info->kvm;
if (kthread) {
if (!mmget_not_zero(kvm->mm))
return -EFAULT;
use_mm(kvm->mm);
}
idx = srcu_read_lock(&kvm->srcu);
ret = write ? kvm_write_guest(kvm, gpa, buf, len) :
kvm_read_guest(kvm, gpa, buf, len);
srcu_read_unlock(&kvm->srcu, idx);
if (kthread) {
unuse_mm(kvm->mm);
mmput(kvm->mm);
}
return ret;
return vfio_dma_rw(kvmgt_vdev(info->vgpu)->vfio_group,
gpa, buf, len, write);
}
static int kvmgt_read_gpa(unsigned long handle, unsigned long gpa,