[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] [Qemu-ppc] [PATCH qemu v13 05/16] spapr_iommu: Add root
From: |
David Gibson |
Subject: |
Re: [Qemu-devel] [Qemu-ppc] [PATCH qemu v13 05/16] spapr_iommu: Add root memory region |
Date: |
Fri, 4 Mar 2016 15:08:51 +1100 |
User-agent: |
Mutt/1.5.24 (2015-08-30) |
On Tue, Mar 01, 2016 at 08:10:30PM +1100, Alexey Kardashevskiy wrote:
> We are going to have multiple DMA windows at different offsets on
> a PCI bus. For the sake of migration, we will have as many TCE table
> objects pre-created as many windows supported.
> So we need a way to map windows dynamically onto a PCI bus
> when migration of a table is completed but at this stage a TCE table
> object does not have access to a PHB to ask it to map a DMA window
> backed by just migrated TCE table.
>
> This adds a "root" memory region (UINT64_MAX long) to the TCE object.
> This new region is mapped on a PCI bus with enabled overlapping as
> there will be one root MR per TCE table, each of them mapped at 0.
> The actual IOMMU memory region is a subregion of the root region and
> a TCE table enables/disables this subregion and maps it at
> the specific offset inside the root MR which is 1:1 mapping of
> a PCI address space.
>
> Signed-off-by: Alexey Kardashevskiy <address@hidden>
> Reviewed-by: David Gibson <address@hidden>
> Reviewed-by: Thomas Huth <address@hidden>
> ---
> hw/ppc/spapr_iommu.c | 13 ++++++++++---
> hw/ppc/spapr_pci.c | 5 +++--
> include/hw/ppc/spapr.h | 2 +-
> 3 files changed, 14 insertions(+), 6 deletions(-)
>
> diff --git a/hw/ppc/spapr_iommu.c b/hw/ppc/spapr_iommu.c
> index e66e128..ba9ddbb 100644
> --- a/hw/ppc/spapr_iommu.c
> +++ b/hw/ppc/spapr_iommu.c
> @@ -172,10 +172,15 @@ static MemoryRegionIOMMUOps spapr_iommu_ops = {
> static int spapr_tce_table_realize(DeviceState *dev)
> {
> sPAPRTCETable *tcet = SPAPR_TCE_TABLE(dev);
> + Object *tcetobj = OBJECT(tcet);
> + char tmp[32];
>
> tcet->fd = -1;
> - memory_region_init_iommu(&tcet->iommu, OBJECT(dev), &spapr_iommu_ops,
> - "iommu-spapr", 0);
> + snprintf(tmp, sizeof(tmp), "tce-root-%x", tcet->liobn);
> + memory_region_init(&tcet->root, tcetobj, tmp, UINT64_MAX);
> +
> + snprintf(tmp, sizeof(tmp), "tce-iommu-%x", tcet->liobn);
> + memory_region_init_iommu(&tcet->iommu, tcetobj, &spapr_iommu_ops, tmp,
> 0);
>
> QLIST_INSERT_HEAD(&spapr_tce_tables, tcet, list);
>
> @@ -253,6 +258,7 @@ static void spapr_tce_table_do_enable(sPAPRTCETable *tcet)
>
> memory_region_set_size(&tcet->iommu,
> (uint64_t)tcet->nb_table << tcet->page_shift);
> + memory_region_add_subregion(&tcet->root, tcet->bus_offset, &tcet->iommu);
>
> tcet->enabled = true;
> }
> @@ -279,6 +285,7 @@ static void spapr_tce_table_disable(sPAPRTCETable *tcet)
> return;
> }
>
> + memory_region_del_subregion(&tcet->root, &tcet->iommu);
> memory_region_set_size(&tcet->iommu, 0);
>
> spapr_tce_free_table(tcet->table, tcet->fd, tcet->nb_table);
> @@ -302,7 +309,7 @@ static void spapr_tce_table_unrealize(DeviceState *dev,
> Error **errp)
>
> MemoryRegion *spapr_tce_get_iommu(sPAPRTCETable *tcet)
> {
> - return &tcet->iommu;
> + return &tcet->root;
> }
>
> static void spapr_tce_reset(DeviceState *dev)
> diff --git a/hw/ppc/spapr_pci.c b/hw/ppc/spapr_pci.c
> index c34a906..7b40687 100644
> --- a/hw/ppc/spapr_pci.c
> +++ b/hw/ppc/spapr_pci.c
> @@ -822,8 +822,6 @@ static int spapr_phb_dma_window_enable(sPAPRPHBState
> *sphb,
>
> spapr_tce_table_enable(tcet, page_shift, window_addr, nb_table, false);
>
> - memory_region_add_subregion(&sphb->iommu_root, tcet->bus_offset,
> - spapr_tce_get_iommu(tcet));
> return 0;
> }
>
> @@ -1411,6 +1409,9 @@ static void spapr_phb_realize(DeviceState *dev, Error
> **errp)
> return;
> }
>
> + memory_region_add_subregion(&sphb->iommu_root, 0,
> + spapr_tce_get_iommu(tcet));
> +
Logically this patch should add the _overlap() option rather than a
later one, yes?
> /* Register default 32bit DMA window */
> spapr_phb_dma_window_enable(sphb, sphb->dma_liobn,
> SPAPR_TCE_PAGE_SHIFT,
> diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
> index 3e6bb84..bdf27ec 100644
> --- a/include/hw/ppc/spapr.h
> +++ b/include/hw/ppc/spapr.h
> @@ -548,7 +548,7 @@ struct sPAPRTCETable {
> bool bypass;
> bool need_vfio;
> int fd;
> - MemoryRegion iommu;
> + MemoryRegion root, iommu;
> struct VIOsPAPRDevice *vdev; /* for @bypass migration compatibility only
> */
> QLIST_ENTRY(sPAPRTCETable) list;
> };
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
signature.asc
Description: PGP signature
- Re: [Qemu-devel] [Qemu-ppc] [PATCH qemu v13 12/16] vmstate: Define VARRAY with VMS_ALLOC, (continued)
- [Qemu-devel] [PATCH qemu v13 14/16] spapr_pci: Add and export DMA resetting helper, Alexey Kardashevskiy, 2016/03/01
- [Qemu-devel] [PATCH qemu v13 05/16] spapr_iommu: Add root memory region, Alexey Kardashevskiy, 2016/03/01
- Re: [Qemu-devel] [Qemu-ppc] [PATCH qemu v13 05/16] spapr_iommu: Add root memory region,
David Gibson <=
- [Qemu-devel] [PATCH qemu v13 06/16] spapr_pci: Reset DMA config on PHB reset, Alexey Kardashevskiy, 2016/03/01
- [Qemu-devel] [PATCH qemu v13 02/16] spapr_pci: Move DMA window enablement to a helper, Alexey Kardashevskiy, 2016/03/01
[Qemu-devel] [PATCH qemu v13 15/16] vfio: Move iova_pgsizes from container to guest IOMMU, Alexey Kardashevskiy, 2016/03/01
[Qemu-devel] [PATCH qemu v13 07/16] vfio, memory: Notify IOMMU about starting/stopping being used by VFIO, Alexey Kardashevskiy, 2016/03/01