linux-kernel - [PATCH 1/3] migration: update BAR space size

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Message-ID: <20250218021507.40740-2-liulongfang@huawei.com>
Date: Tue, 18 Feb 2025 10:15:05 +0800
From: Longfang Liu <liulongfang@...wei.com>
To: <alex.williamson@...hat.com>, <jgg@...dia.com>,
	<shameerali.kolothum.thodi@...wei.com>, <jonathan.cameron@...wei.com>
CC: <kvm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linuxarm@...neuler.org>, <liulongfang@...wei.com>
Subject: [PATCH 1/3] migration: update BAR space size

On the new hardware platform, the live migration configuration region
is moved from VF to PF. The VF's own configuration space is
restored to the complete 64KB, and there is no need to divide the
size of the BAR configuration space equally.

Signed-off-by: Longfang Liu <liulongfang@...wei.com>
---
 .../vfio/pci/hisilicon/hisi_acc_vfio_pci.c    | 41 +++++++++++++++----
 1 file changed, 32 insertions(+), 9 deletions(-)

diff --git a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
index 451c639299eb..599905dbb707 100644
--- a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
+++ b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
@@ -1195,6 +1195,33 @@ static struct hisi_qm *hisi_acc_get_pf_qm(struct pci_dev *pdev)
 	return !IS_ERR(pf_qm) ? pf_qm : NULL;
 }
 
+static size_t hisi_acc_get_resource_len(struct vfio_pci_core_device *vdev,
+					unsigned int index)
+{
+	struct hisi_acc_vf_core_device *hisi_acc_vdev =
+			hisi_acc_drvdata(vdev->pdev);
+
+	/*
+	 * ACC VF dev 64KB BAR2 region consists of both functional
+	 * register space and migration control register space, each
+	 * uses 32KB BAR2 region, on the system with more than 64KB
+	 * page size, even if the migration control register space
+	 * is written by VM, it will only affects the VF.
+	 *
+	 * In order to support the live migration function in the
+	 * system with a page size above 64KB, the driver needs
+	 * to ensure that the VF region size is aligned with the
+	 * system page size.
+	 *
+	 * On the new hardware platform, the live migration control register
+	 * has been moved from VF to PF.
+	 */
+	if (hisi_acc_vdev->pf_qm->ver == QM_HW_V3)
+		return (pci_resource_len(vdev->pdev, index) >> 1);
+
+	return pci_resource_len(vdev->pdev, index);
+}
+
 static int hisi_acc_pci_rw_access_check(struct vfio_device *core_vdev,
 					size_t count, loff_t *ppos,
 					size_t *new_count)
@@ -1205,8 +1232,9 @@ static int hisi_acc_pci_rw_access_check(struct vfio_device *core_vdev,
 
 	if (index == VFIO_PCI_BAR2_REGION_INDEX) {
 		loff_t pos = *ppos & VFIO_PCI_OFFSET_MASK;
-		resource_size_t end = pci_resource_len(vdev->pdev, index) / 2;
+		resource_size_t end;
 
+		end = hisi_acc_get_resource_len(vdev, index);
 		/* Check if access is for migration control region */
 		if (pos >= end)
 			return -EINVAL;
@@ -1227,8 +1255,9 @@ static int hisi_acc_vfio_pci_mmap(struct vfio_device *core_vdev,
 	index = vma->vm_pgoff >> (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT);
 	if (index == VFIO_PCI_BAR2_REGION_INDEX) {
 		u64 req_len, pgoff, req_start;
-		resource_size_t end = pci_resource_len(vdev->pdev, index) / 2;
+		resource_size_t end;
 
+		end = PAGE_ALIGN(hisi_acc_get_resource_len(vdev, index));
 		req_len = vma->vm_end - vma->vm_start;
 		pgoff = vma->vm_pgoff &
 			((1U << (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT)) - 1);
@@ -1275,7 +1304,6 @@ static long hisi_acc_vfio_pci_ioctl(struct vfio_device *core_vdev, unsigned int
 	if (cmd == VFIO_DEVICE_GET_REGION_INFO) {
 		struct vfio_pci_core_device *vdev =
 			container_of(core_vdev, struct vfio_pci_core_device, vdev);
-		struct pci_dev *pdev = vdev->pdev;
 		struct vfio_region_info info;
 		unsigned long minsz;
 
@@ -1290,12 +1318,7 @@ static long hisi_acc_vfio_pci_ioctl(struct vfio_device *core_vdev, unsigned int
 		if (info.index == VFIO_PCI_BAR2_REGION_INDEX) {
 			info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
 
-			/*
-			 * ACC VF dev BAR2 region consists of both functional
-			 * register space and migration control register space.
-			 * Report only the functional region to Guest.
-			 */
-			info.size = pci_resource_len(pdev, info.index) / 2;
+			info.size = hisi_acc_get_resource_len(vdev, info.index);
 
 			info.flags = VFIO_REGION_INFO_FLAG_READ |
 					VFIO_REGION_INFO_FLAG_WRITE |
-- 
2.24.0