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Commit b86dc6ed authored by Chuanxiao Dong's avatar Chuanxiao Dong Committed by Zhenyu Wang
Browse files

drm/i915/gvt: map pfn for PTE entry in kvm 



When host i915 iommu enabled, gvt needs to use a mapped pfn in PTE entry
So before kvm returns the pfn, map this pfn and return the mapped address
which is so called iova.

Signed-off-by: default avatarChuanxiao Dong <chuanxiao.dong@intel.com>
Signed-off-by: default avatarZhenyu Wang <zhenyuw@linux.intel.com>
parent 5de6bd4c

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

+49 −13
Original line number Diff line number Diff line
@@ -77,7 +77,7 @@ struct kvmgt_guest_info { 
struct gvt_dma {

	struct rb_node node;

	gfn_t gfn;

	kvm_pfn_t pfn;

	unsigned long iova;

};



static inline bool handle_valid(unsigned long handle)
@@ -89,6 +89,35 @@ static int kvmgt_guest_init(struct mdev_device *mdev); 
static void intel_vgpu_release_work(struct work_struct *work);

static bool kvmgt_guest_exit(struct kvmgt_guest_info *info);



static int gvt_dma_map_iova(struct intel_vgpu *vgpu, kvm_pfn_t pfn,

		unsigned long *iova)

{

	struct page *page;

	struct device *dev = &vgpu->gvt->dev_priv->drm.pdev->dev;

	dma_addr_t daddr;



	page = pfn_to_page(pfn);

	if (is_error_page(page))

		return -EFAULT;



	daddr = dma_map_page(dev, page, 0, PAGE_SIZE,

			PCI_DMA_BIDIRECTIONAL);

	if (dma_mapping_error(dev, daddr))

		return -ENOMEM;



	*iova = (unsigned long)(daddr >> PAGE_SHIFT);

	return 0;

}



static void gvt_dma_unmap_iova(struct intel_vgpu *vgpu, unsigned long iova)

{

	struct device *dev = &vgpu->gvt->dev_priv->drm.pdev->dev;

	dma_addr_t daddr;



	daddr = (dma_addr_t)(iova << PAGE_SHIFT);

	dma_unmap_page(dev, daddr, PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);

}



static struct gvt_dma *__gvt_cache_find(struct intel_vgpu *vgpu, gfn_t gfn)

{

	struct rb_node *node = vgpu->vdev.cache.rb_node;
@@ -111,21 +140,22 @@ static struct gvt_dma *__gvt_cache_find(struct intel_vgpu *vgpu, gfn_t gfn) 
	return ret;

}



static kvm_pfn_t gvt_cache_find(struct intel_vgpu *vgpu, gfn_t gfn)

static unsigned long gvt_cache_find(struct intel_vgpu *vgpu, gfn_t gfn)

{

	struct gvt_dma *entry;

	kvm_pfn_t pfn;

	unsigned long iova;



	mutex_lock(&vgpu->vdev.cache_lock);



	entry = __gvt_cache_find(vgpu, gfn);

	pfn = (entry == NULL) ? 0 : entry->pfn;

	iova = (entry == NULL) ? INTEL_GVT_INVALID_ADDR : entry->iova;



	mutex_unlock(&vgpu->vdev.cache_lock);

	return pfn;

	return iova;

}



static void gvt_cache_add(struct intel_vgpu *vgpu, gfn_t gfn, kvm_pfn_t pfn)

static void gvt_cache_add(struct intel_vgpu *vgpu, gfn_t gfn,

		unsigned long iova)

{

	struct gvt_dma *new, *itr;

	struct rb_node **link = &vgpu->vdev.cache.rb_node, *parent = NULL;
@@ -135,7 +165,7 @@ static void gvt_cache_add(struct intel_vgpu *vgpu, gfn_t gfn, kvm_pfn_t pfn) 
		return;



	new->gfn = gfn;

	new->pfn = pfn;

	new->iova = iova;



	mutex_lock(&vgpu->vdev.cache_lock);

	while (*link) {
@@ -182,6 +212,7 @@ static void gvt_cache_remove(struct intel_vgpu *vgpu, gfn_t gfn) 
	}



	g1 = gfn;

	gvt_dma_unmap_iova(vgpu, this->iova);

	rc = vfio_unpin_pages(dev, &g1, 1);

	WARN_ON(rc != 1);

	__gvt_cache_remove_entry(vgpu, this);
@@ -204,6 +235,7 @@ static void gvt_cache_destroy(struct intel_vgpu *vgpu) 
	mutex_lock(&vgpu->vdev.cache_lock);

	while ((node = rb_first(&vgpu->vdev.cache))) {

		dma = rb_entry(node, struct gvt_dma, node);

		gvt_dma_unmap_iova(vgpu, dma->iova);

		gfn = dma->gfn;



		vfio_unpin_pages(dev, &gfn, 1);
@@ -1348,7 +1380,7 @@ static int kvmgt_inject_msi(unsigned long handle, u32 addr, u16 data) 


static unsigned long kvmgt_gfn_to_pfn(unsigned long handle, unsigned long gfn)

{

	unsigned long pfn;

	unsigned long iova, pfn;

	struct kvmgt_guest_info *info;

	struct device *dev;

	int rc;
@@ -1357,9 +1389,9 @@ static unsigned long kvmgt_gfn_to_pfn(unsigned long handle, unsigned long gfn) 
		return INTEL_GVT_INVALID_ADDR;



	info = (struct kvmgt_guest_info *)handle;

	pfn = gvt_cache_find(info->vgpu, gfn);

	if (pfn != 0)

		return pfn;

	iova = gvt_cache_find(info->vgpu, gfn);

	if (iova != INTEL_GVT_INVALID_ADDR)

		return iova;



	pfn = INTEL_GVT_INVALID_ADDR;

	dev = mdev_dev(info->vgpu->vdev.mdev);
@@ -1368,9 +1400,13 @@ static unsigned long kvmgt_gfn_to_pfn(unsigned long handle, unsigned long gfn) 
		gvt_err("vfio_pin_pages failed for gfn 0x%lx: %d\n", gfn, rc);

		return INTEL_GVT_INVALID_ADDR;

	}

	/* transfer to host iova for GFX to use DMA */

	rc = gvt_dma_map_iova(info->vgpu, pfn, &iova);

	if (rc)

		gvt_err("gvt_dma_map_iova failed for gfn: 0x%lx\n", gfn);



	gvt_cache_add(info->vgpu, gfn, pfn);

	return pfn;

	gvt_cache_add(info->vgpu, gfn, iova);

	return iova;

}



static int kvmgt_rw_gpa(unsigned long handle, unsigned long gpa,