69 lines
2.2 KiB
Diff
69 lines
2.2 KiB
Diff
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From 1bbc795190c3ad7c838dc57a6f7a38a779dfdd65 Mon Sep 17 00:00:00 2001
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From: Zhenzhong Duan <zhenzhong.duan@intel.com>
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Date: Sat, 11 Jan 2025 10:52:48 +0800
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Subject: [PATCH] vfio/platform: Allow the selection of a given iommu backend
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Now we support two types of iommu backends, let's add the capability
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to select one of them. This depends on whether an iommufd object has
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been linked with the vfio-platform device:
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If the user wants to use the legacy backend, it shall not
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link the vfio-platform device with any iommufd object:
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-device vfio-platform,host=XXX
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This is called the legacy mode/backend.
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If the user wants to use the iommufd backend (/dev/iommu) it
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shall pass an iommufd object id in the vfio-platform device options:
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-object iommufd,id=iommufd0
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-device vfio-platform,host=XXX,iommufd=iommufd0
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Suggested-by: Alex Williamson <alex.williamson@redhat.com>
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Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
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Reviewed-by: Cédric Le Goater <clg@redhat.com>
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Reviewed-by: Eric Auger <eric.auger@redhat.com>
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Tested-by: Nicolin Chen <nicolinc@nvidia.com>
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Signed-off-by: Cédric Le Goater <clg@redhat.com>
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Signed-off-by: Zhou Wang <wangzhou1@hisilicon.com>
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---
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hw/vfio/platform.c | 6 ++++++
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1 file changed, 6 insertions(+)
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diff --git a/hw/vfio/platform.c b/hw/vfio/platform.c
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index 8e3d4ac458..98ae4bc655 100644
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--- a/hw/vfio/platform.c
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+++ b/hw/vfio/platform.c
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@@ -15,11 +15,13 @@
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*/
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#include "qemu/osdep.h"
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+#include CONFIG_DEVICES /* CONFIG_IOMMUFD */
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#include "qapi/error.h"
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#include <sys/ioctl.h>
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#include <linux/vfio.h>
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#include "hw/vfio/vfio-platform.h"
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+#include "sysemu/iommufd.h"
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#include "migration/vmstate.h"
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#include "qemu/error-report.h"
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#include "qemu/lockable.h"
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@@ -649,6 +651,10 @@ static Property vfio_platform_dev_properties[] = {
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DEFINE_PROP_UINT32("mmap-timeout-ms", VFIOPlatformDevice,
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mmap_timeout, 1100),
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DEFINE_PROP_BOOL("x-irqfd", VFIOPlatformDevice, irqfd_allowed, true),
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+#ifdef CONFIG_IOMMUFD
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+ DEFINE_PROP_LINK("iommufd", VFIOPlatformDevice, vbasedev.iommufd,
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+ TYPE_IOMMUFD_BACKEND, IOMMUFDBackend *),
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+#endif
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DEFINE_PROP_END_OF_LIST(),
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};
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--
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2.41.0.windows.1
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