drm/i915/gvt: subsitute kvm_read/write_guest with vfio_dma_rw (b59b2a3e) · Commits · 戴 / test

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

drivers/gpu/drm/i915/gvt/kvmgt.c

+2 −21

Original line number	Diff line number	Diff line
		@@ -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,

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