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Re: [PATCH v4 2/3] virtio-iommu: Add a granule property
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From: |
Philippe Mathieu-Daudé |
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Subject: |
Re: [PATCH v4 2/3] virtio-iommu: Add a granule property |
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Date: |
Fri, 23 Feb 2024 08:57:24 +0100 |
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User-agent: |
Mozilla Thunderbird |
On 23/2/24 08:27, Eric Auger wrote:
This allows to choose which granule will be used by
default by the virtio-iommu. Current page size mask
default is qemu_target_page_mask so this translates
into a 4K granule.
Signed-off-by: Eric Auger <eric.auger@redhat.com>
---
v3 -> v4:
- granule_mode introduction moved to that patch
---
include/hw/virtio/virtio-iommu.h | 1 +
hw/virtio/virtio-iommu.c | 27 ++++++++++++++++++++++++---
qemu-options.hx | 3 +++
3 files changed, 28 insertions(+), 3 deletions(-)
@@ -1324,7 +1324,26 @@ static void virtio_iommu_device_realize(DeviceState
*dev, Error **errp)
* in vfio realize
*/
s->config.bypass = s->boot_bypass;
- s->config.page_size_mask = qemu_target_page_mask();
+
+ switch (s->granule_mode) {
+ case GRANULE_MODE_4K:
+ s->config.page_size_mask = ~0xFFF;
Alternatively:
s->config.page_size_mask = -(4 * KiB);
+ break;
+ case GRANULE_MODE_8K:
+ s->config.page_size_mask = ~0x1FFF;
s->config.page_size_mask = -(8 * KiB);
+ break;
+ case GRANULE_MODE_16K:
+ s->config.page_size_mask = ~0x3FFF;
...
+ break;
+ case GRANULE_MODE_64K:
+ s->config.page_size_mask = ~0xFFFF;
+ break;
+ case GRANULE_MODE_HOST:
+ s->config.page_size_mask = qemu_real_host_page_mask();
+ break;
+ default:
+ error_setg(errp, "Unsupported granule mode");
+ }