0028-drm-i915-gvt-xengt-Impliment-mpt-dma_map-unmap_guest.patch

From 9898d72868efde6da81ea3885c41b8e45e4c4726 Mon Sep 17 00:00:00 2001
From: Xiong Zhang <xiong.y.zhang@intel.com>
Date: Tue, 6 Mar 2018 22:06:12 +0800
Subject: [PATCH 28/56] drm/i915/gvt/xengt: Impliment
 mpt->dma_map/unmap_guest_page

Commit b2079a4352a7(drm/i915/gvt: Fix guest vGPU hang caused by very
high dma setup overhead) add a mandatory mpt interface
dma_map/unmap_guest_page, xengt should implement it. it has the same
function as gfn_to_mfn in xengt.

Signed-off-by: Xiong Zhang <xiong.y.zhang@intel.com>
---
 drivers/gpu/drm/i915/gvt/xengt.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/drivers/gpu/drm/i915/gvt/xengt.c b/drivers/gpu/drm/i915/gvt/xengt.c
index 4eed86bb942a..effa6e865006 100644
--- a/drivers/gpu/drm/i915/gvt/xengt.c
+++ b/drivers/gpu/drm/i915/gvt/xengt.c
@@ -1801,6 +1801,27 @@ static unsigned long xengt_gfn_to_pfn(unsigned long handle, unsigned long gfn)
 	return pfn;
 }
 
+static int xengt_dma_map_guest_page(unsigned long handle, unsigned long gfn,
+			unsigned long size, dma_addr_t *dma_addr)
+{
+	unsigned long pfn;
+
+	BUG_ON(size != PAGE_SIZE);
+	pfn = xengt_gfn_to_pfn(handle, gfn);
+
+	if (pfn < 0)
+		return -EINVAL;
+
+	*dma_addr = pfn << PAGE_SHIFT;
+
+	return 0;
+}
+
+static void xengt_dma_unmap_guest_page(unsigned long handle,
+			dma_addr_t dma_addr)
+{
+}
+
 struct intel_gvt_mpt xengt_mpt = {
 	//.detect_host = xengt_detect_host,
 	.host_init = xengt_host_init,
@@ -1814,6 +1835,8 @@ struct intel_gvt_mpt xengt_mpt = {
 	.read_gpa = xengt_read_gpa,
 	.write_gpa = xengt_write_gpa,
 	.gfn_to_mfn = xengt_gfn_to_pfn,
+	.dma_map_guest_page = xengt_dma_map_guest_page,
+	.dma_unmap_guest_page = xengt_dma_unmap_guest_page,
 	.map_gfn_to_mfn = xengt_map_gfn_to_mfn,
 	.set_trap_area = xengt_set_trap_area,
 };
-- 
2.34.1