|
| From: | Aviv B.D. |
| Subject: | Re: [Qemu-devel] [PATCH][RFC] IOMMU: Add Support to VFIO devices with vIOMMU present |
| Date: | Sat, 26 Mar 2016 17:47:18 +0300 |
On Sat, Mar 12, 2016 at 06:13:17PM +0200, Aviv B.D. wrote:
So what happens here if the address is changed when entry stays valid?> From: "Aviv B.D." <address@hidden>
>
> * Fix bug that prevent qemu from starting up when vIOMMU and VFIO
> device are present.
> * Advertise Cache Mode capability in iommu cap register.
> * Register every VFIO device with IOMMU state.
> * On page cache invalidation in vIOMMU, check if the domain belong to
> VFIO device and mirror the guest requests to host.
>
> Not working (Yet!):
> * Tested only with network interface card (ixgbevf) and
> intel_iommu=strict in guest's kernel command line.
> * Lock up under high load.
> * Errors on guest poweroff.
> * High relative latency compare to VFIO without IOMMU.
>
> Signed-off-by: Aviv B.D. <address@hidden>
> ---
> hw/i386/intel_iommu.c | 76 ++++++++++++++++++++++++++++++++++++++----
> hw/i386/intel_iommu_internal.h | 1 +
> hw/vfio/common.c | 12 +++++--
> include/hw/i386/intel_iommu.h | 4 +++
> include/hw/vfio/vfio-common.h | 1 +
> 5 files changed, 85 insertions(+), 9 deletions(-)
>
> diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
> index 347718f..046688f 100644
> --- a/hw/i386/intel_iommu.c
> +++ b/hw/i386/intel_iommu.c
> @@ -43,6 +44,9 @@ static int vtd_dbgflags = VTD_DBGBIT(GENERAL) | VTD_DBGBIT
> (CSR);
> #define VTD_DPRINTF(what, fmt, ...) do {} while (0)
> #endif
>
> +static int vtd_dev_to_context_entry(IntelIOMMUState *s, uint8_t bus_num,
> + uint8_t devfn, VTDContextEntry *ce);
> +
> static void vtd_define_quad(IntelIOMMUState *s, hwaddr addr, uint64_t val,
> uint64_t wmask, uint64_t w1cmask)
> {
> @@ -126,6 +130,19 @@ static uint32_t vtd_set_clear_mask_long(IntelIOMMUState
> *s, hwaddr addr,
> return new_val;
> }
>
> +static uint16_t vtd_get_did_dev(IntelIOMMUState *s, uint8_t bus_num, uint8_t
> devfn)
> +{
> + VTDContextEntry ce;
> + int ret_fr;
> +
> + ret_fr = vtd_dev_to_context_entry(s, bus_num, devfn, &ce);
> + if (ret_fr){
> + return -1;
> + }
> +
> + return VTD_CONTEXT_ENTRY_DID(ce.hi);
> +}
> +
> static uint64_t vtd_set_clear_mask_quad(IntelIOMMUState *s, hwaddr addr,
> uint64_t clear, uint64_t mask)
> {
> @@ -711,9 +728,9 @@ static int vtd_dev_to_context_entry(IntelIOMMUState *s,
> uint8_t bus_num,
> }
>
> if (!vtd_context_entry_present(ce)) {
> - VTD_DPRINTF(GENERAL,
> + /*VTD_DPRINTF(GENERAL,
> "error: context-entry #%"PRIu8 "(bus #%"PRIu8 ") "
> - "is not present", devfn, bus_num);
> + "is not present", devfn, bus_num);*/
> return -VTD_FR_CONTEXT_ENTRY_P;
> } else if ((ce->hi & VTD_CONTEXT_ENTRY_RSVD_HI) ||
> (ce->lo & VTD_CONTEXT_ENTRY_RSVD_LO)) {
> @@ -1020,14 +1037,53 @@ static void vtd_iotlb_page_invalidate(IntelIOMMUState
> *s, uint16_t domain_id,
> hwaddr addr, uint8_t am)
> {
> VTDIOTLBPageInvInfo info;
> + VFIOGuestIOMMU * giommu;
> + bool flag = false;
>
> assert(am <= VTD_MAMV);
> info.domain_id = domain_id;
> info.addr = addr;
> info.mask = ~((1 << am) - 1);
> +
> + QLIST_FOREACH(giommu, &(s->giommu_list), iommu_next){
> + VTDAddressSpace *vtd_as = container_of(giommu->iommu, VTDAddressSpace,
> iommu);
> + uint16_t vfio_source_id = vtd_make_source_id(pci_bus_num(vtd_as->bus),
> vtd_as->devfn);
> + uint16_t vfio_domain_id = vtd_get_did_dev(s, pci_bus_num(vtd_as->bus),
> vtd_as->devfn);
> + if (vfio_domain_id != (uint16_t)-1 &&
> + domain_id == vfio_domain_id){
> + VTDIOTLBEntry *iotlb_entry = vtd_lookup_iotlb(s, vfio_source_id,
> addr);
> + if (iotlb_entry != NULL){
> + IOMMUTLBEntry entry;
> + VTD_DPRINTF(GENERAL, "Remove addr 0x%"PRIx64 " mask %d", addr,
> am);
> + entry.iova = addr & VTD_PAGE_MASK_4K;
> + entry.translated_addr = vtd_get_slpte_addr(iotlb_entry->slpte)
> & VTD_PAGE_MASK_4K;
> + entry.addr_mask = ~VTD_PAGE_MASK_4K;
> + entry.perm = IOMMU_NONE;
> + memory_region_notify_iommu(giommu->iommu, entry);
> + flag = true;
> +
> + }
> + }
> +
> + }
> +
> g_hash_table_foreach_remove(s->iotlb, vtd_hash_remove_by_page, &info);
> -}
>
> + QLIST_FOREACH(giommu, &(s->giommu_list), iommu_next){
> + VTDAddressSpace *vtd_as = container_of(giommu->iommu, VTDAddressSpace,
> iommu);
> + uint16_t vfio_domain_id = vtd_get_did_dev(s, pci_bus_num(vtd_as->bus),
> vtd_as->devfn);
> + if (vfio_domain_id != (uint16_t)-1 &&
> + domain_id == vfio_domain_id && !flag){
> + /* do vfio map */
I think vfio in kernel will fail the map address,
later in userspace the address is first unmapped, then new one mapped.
If a device accesses the entry during this process,
it will get a fault, and this looks like a bug to me.
I suspect we need to teach vfio in kernel to update
entries, this might not be easy to do.
> + VTD_DPRINTF(GENERAL, "add addr 0x%"PRIx64 " mask %d", addr, am);
> + /* call to vtd_iommu_translate */
> + IOMMUTLBEntry entry = s->iommu_ops.translate(giommu->iommu, addr,
> 0);
> + entry.perm = IOMMU_RW;
> + memory_region_notify_iommu(giommu->iommu, entry);
> + //g_vfio_iommu->n.notify(&g_vfio_iommu->n, &entry);
> + }
> + }
> +}
> /* Flush IOTLB
> * Returns the IOTLB Actual Invalidation Granularity.
> * @val: the content of the IOTLB_REG
> @@ -1895,6 +1951,13 @@ static Property vtd_properties[] = {
> DEFINE_PROP_END_OF_LIST(),
> };
>
> +void vtd_register_giommu(VFIOGuestIOMMU * giommu)
> +{
> + VTDAddressSpace *vtd_as = container_of(giommu->iommu, VTDAddressSpace,
> iommu);
> + IntelIOMMUState *s = vtd_as->iommu_state;
> +
> + QLIST_INSERT_HEAD(&s->giommu_list, giommu, iommu_next);
> +}
>
> VTDAddressSpace *vtd_find_add_as(IntelIOMMUState *s, PCIBus *bus, int devfn)
> {
> @@ -1949,7 +2012,8 @@ static void vtd_init(IntelIOMMUState *s)
> s->iq_last_desc_type = VTD_INV_DESC_NONE;
> s->next_frcd_reg = 0;
> s->cap = VTD_CAP_FRO | VTD_CAP_NFR | VTD_CAP_ND | VTD_CAP_MGAW |
> - VTD_CAP_SAGAW | VTD_CAP_MAMV | VTD_CAP_PSI | VTD_CAP_SLLPS;
> + VTD_CAP_SAGAW | VTD_CAP_MAMV | VTD_CAP_PSI | VTD_CAP_SLLPS |
> + VTD_CAP_CM;
> s->ecap = VTD_ECAP_QI | VTD_ECAP_IRO;
>
> vtd_reset_context_cache(s);
> diff --git a/hw/i386/intel_iommu_internal.h b/hw/i386/intel_iommu_internal.h
> index e5f514c..ae40f73 100644
> --- a/hw/i386/intel_iommu_internal.h
> +++ b/hw/i386/intel_iommu_internal.h
> @@ -190,6 +190,7 @@
> #define VTD_CAP_MAMV (VTD_MAMV << 48)
> #define VTD_CAP_PSI (1ULL << 39)
> #define VTD_CAP_SLLPS ((1ULL << 34) | (1ULL << 35))
> +#define VTD_CAP_CM (1ULL << 7)
>
> /* Supported Adjusted Guest Address Widths */
> #define VTD_CAP_SAGAW_SHIFT 8
> diff --git a/hw/vfio/common.c b/hw/vfio/common.c
> index 607ec70..98c8d67 100644
> --- a/hw/vfio/common.c
> +++ b/hw/vfio/common.c
> @@ -32,6 +32,9 @@
> #include "sysemu/kvm.h"
> #include "trace.h"
>
> +#include "hw/sysbus.h"
> +#include "hw/i386/intel_iommu.h"
> +
> struct vfio_group_head vfio_group_list =
> QLIST_HEAD_INITIALIZER(vfio_group_list);
> struct vfio_as_head vfio_address_spaces =
> @@ -312,12 +315,12 @@ static void vfio_iommu_map_notify(Notifier *n, void
> *data)
> out:
> rcu_read_unlock();
> }
> -
> +#if 0
> static hwaddr vfio_container_granularity(VFIOContainer *container)
> {
> return (hwaddr)1 << ctz64(container->iova_pgsizes);
> }
> -
> +#endif
> static void vfio_listener_region_add(MemoryListener *listener,
> MemoryRegionSection *section)
> {
> @@ -344,6 +347,7 @@ static void vfio_listener_region_add(MemoryListener
> *listener,
> iova = TARGET_PAGE_ALIGN(section->offset_within_address_space);
> llend = int128_make64(section->offset_within_address_space);
> llend = int128_add(llend, section->size);
> + llend = int128_add(llend, int128_exts64(-1));
> llend = int128_and(llend, int128_exts64(TARGET_PAGE_MASK));
>
> if (int128_ge(int128_make64(iova), llend)) {
> @@ -381,11 +385,13 @@ static void vfio_listener_region_add(MemoryListener
> *listener,
> giommu->n.notify = vfio_iommu_map_notify;
> QLIST_INSERT_HEAD(&container->giommu_list, giommu, giommu_next);
>
> + vtd_register_giommu(giommu);
> memory_region_register_iommu_notifier(giommu->iommu, &giommu->n);
> +#if 0
> memory_region_iommu_replay(giommu->iommu, &giommu->n,
> vfio_container_granularity(container),
> false);
> -
> +#endif
> return;
> }
>
> diff --git a/include/hw/i386/intel_iommu.h b/include/hw/i386/intel_iommu.h
> index b024ffa..22f3f83 100644
> --- a/include/hw/i386/intel_iommu.h
> +++ b/include/hw/i386/intel_iommu.h
> @@ -23,6 +23,7 @@
> #define INTEL_IOMMU_H
> #include "hw/qdev.h"
> #include "sysemu/dma.h"
> +#include "hw/vfio/vfio-common.h"
>
> #define TYPE_INTEL_IOMMU_DEVICE "intel-iommu"
> #define INTEL_IOMMU_DEVICE(obj) \
> @@ -123,6 +124,8 @@ struct IntelIOMMUState {
> MemoryRegionIOMMUOps iommu_ops;
> GHashTable *vtd_as_by_busptr; /* VTDBus objects indexed by PCIBus*
> reference */
> VTDBus *vtd_as_by_bus_num[VTD_PCI_BUS_MAX]; /* VTDBus objects indexed by
> bus number */
> +
> + QLIST_HEAD(, VFIOGuestIOMMU) giommu_list;
> };
>
> /* Find the VTD Address space associated with the given bus pointer,
> @@ -130,4 +133,5 @@ struct IntelIOMMUState {
> */
> VTDAddressSpace *vtd_find_add_as(IntelIOMMUState *s, PCIBus *bus, int devfn);
>
> +void vtd_register_giommu(VFIOGuestIOMMU * giommu);
> #endif
> diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
> index f037f3c..9225ba3 100644
> --- a/include/hw/vfio/vfio-common.h
> +++ b/include/hw/vfio/vfio-common.h
> @@ -82,6 +82,7 @@ typedef struct VFIOGuestIOMMU {
> MemoryRegion *iommu;
> Notifier n;
> QLIST_ENTRY(VFIOGuestIOMMU) giommu_next;
> + QLIST_ENTRY(VFIOGuestIOMMU) iommu_next;
> } VFIOGuestIOMMU;
>
> typedef struct VFIODeviceOps VFIODeviceOps;
> --
> 1.9.1
>
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