[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] [Qemu-ppc] [PATCH qemu v13 08/16] memory: Add reporting
From: |
David Gibson |
Subject: |
Re: [Qemu-devel] [Qemu-ppc] [PATCH qemu v13 08/16] memory: Add reporting of supported page sizes |
Date: |
Thu, 3 Mar 2016 16:33:52 +1100 |
User-agent: |
Mutt/1.5.24 (2015-08-30) |
On Tue, Mar 01, 2016 at 08:10:33PM +1100, Alexey Kardashevskiy wrote:
> Every IOMMU has some granularity which MemoryRegionIOMMUOps::translate
> uses when translating, however this information is not available outside
> the translate context for various checks.
>
> This adds a get_page_sizes callback to MemoryRegionIOMMUOps and
> a wrapper for it so IOMMU users (such as VFIO) can know the actual
> page size(s) used by an IOMMU.
>
> The qemu_real_host_page_mask is used as fallback.
>
> Signed-off-by: Alexey Kardashevskiy <address@hidden>
I'm going to have to see how this gets used to really analyze it.
But, a preliminary comment:
Once this is added, it should be possible to remove the explicit page
size parameter from the iommu_replay function (since it could be
derived from the IOMMU page sizes).
> ---
> Changes:
> v4:
> * s/1<<TARGET_PAGE_BITS/qemu_real_host_page_size/
> ---
> hw/ppc/spapr_iommu.c | 8 ++++++++
> include/exec/memory.h | 11 +++++++++++
> memory.c | 9 +++++++++
> 3 files changed, 28 insertions(+)
>
> diff --git a/hw/ppc/spapr_iommu.c b/hw/ppc/spapr_iommu.c
> index 67a8356..4c52cf4 100644
> --- a/hw/ppc/spapr_iommu.c
> +++ b/hw/ppc/spapr_iommu.c
> @@ -143,6 +143,13 @@ static int spapr_tce_vfio_notify(MemoryRegion *iommu,
> bool attached)
> return spapr_tce_vfio_notify_owner(tcet->owner, tcet, attached);
> }
>
> +static uint64_t spapr_tce_get_page_sizes(MemoryRegion *iommu)
> +{
> + sPAPRTCETable *tcet = container_of(iommu, sPAPRTCETable, iommu);
> +
> + return 1ULL << tcet->page_shift;
> +}
> +
> static int spapr_tce_table_post_load(void *opaque, int version_id)
> {
> sPAPRTCETable *tcet = SPAPR_TCE_TABLE(opaque);
> @@ -175,6 +182,7 @@ static const VMStateDescription vmstate_spapr_tce_table =
> {
> static MemoryRegionIOMMUOps spapr_iommu_ops = {
> .translate = spapr_tce_translate_iommu,
> .vfio_notify = spapr_tce_vfio_notify,
> + .get_page_sizes = spapr_tce_get_page_sizes,
> };
>
> static int spapr_tce_table_realize(DeviceState *dev)
> diff --git a/include/exec/memory.h b/include/exec/memory.h
> index 9f82629..c34e67c 100644
> --- a/include/exec/memory.h
> +++ b/include/exec/memory.h
> @@ -152,6 +152,8 @@ struct MemoryRegionIOMMUOps {
> IOMMUTLBEntry (*translate)(MemoryRegion *iommu, hwaddr addr, bool
> is_write);
> /* Called when VFIO starts/stops using this */
> int (*vfio_notify)(MemoryRegion *iommu, bool attached);
> + /* Returns supported page sizes */
> + uint64_t (*get_page_sizes)(MemoryRegion *iommu);
> };
>
> typedef struct CoalescedMemoryRange CoalescedMemoryRange;
> @@ -576,6 +578,15 @@ static inline bool memory_region_is_iommu(MemoryRegion
> *mr)
>
>
> /**
> + * memory_region_iommu_get_page_sizes: get supported page sizes in an iommu
> + *
> + * Returns %bitmap of supported page sizes for an iommu.
> + *
> + * @mr: the memory region being queried
> + */
> +uint64_t memory_region_iommu_get_page_sizes(MemoryRegion *mr);
> +
> +/**
> * memory_region_notify_iommu: notify a change in an IOMMU translation entry.
> *
> * @mr: the memory region that was changed
> diff --git a/memory.c b/memory.c
> index 0dd9695..5d8453d 100644
> --- a/memory.c
> +++ b/memory.c
> @@ -1462,6 +1462,15 @@ void memory_region_notify_iommu(MemoryRegion *mr,
> notifier_list_notify(&mr->iommu_notify, &entry);
> }
>
> +uint64_t memory_region_iommu_get_page_sizes(MemoryRegion *mr)
> +{
> + assert(memory_region_is_iommu(mr));
> + if (mr->iommu_ops && mr->iommu_ops->get_page_sizes) {
> + return mr->iommu_ops->get_page_sizes(mr);
> + }
> + return qemu_real_host_page_size;
> +}
> +
> void memory_region_set_log(MemoryRegion *mr, bool log, unsigned client)
> {
> uint8_t mask = 1 << client;
--
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
[Qemu-devel] [PATCH qemu v13 11/16] vfio: spapr: Add SPAPR IOMMU v2 support (DMA memory preregistering), Alexey Kardashevskiy, 2016/03/01