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[RFC v10 25/25] intel_iommu: modify x-scalable-mode to be string option
From: |
Liu Yi L |
Subject: |
[RFC v10 25/25] intel_iommu: modify x-scalable-mode to be string option |
Date: |
Thu, 10 Sep 2020 03:56:38 -0700 |
Intel VT-d 3.0 introduces scalable mode, and it has a bunch of capabilities
related to scalable mode translation, thus there are multiple combinations.
While this vIOMMU implementation wants simplify it for user by providing
typical combinations. User could config it by "x-scalable-mode" option. The
usage is as below:
"-device intel-iommu,x-scalable-mode=["legacy"|"modern"|"off"]"
- "legacy": gives support for SL page table
- "modern": gives support for FL page table, pasid, virtual command
- "off": no scalable mode support
- if not configured, means no scalable mode support, if not proper
configured, will throw error
Note: this patch is supposed to be merged when the whole vSVA patch series
were merged.
Cc: Kevin Tian <kevin.tian@intel.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Yi Sun <yi.y.sun@linux.intel.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Liu Yi L <yi.l.liu@intel.com>
Signed-off-by: Yi Sun <yi.y.sun@linux.intel.com>
---
rfcv5 (v2) -> rfcv6:
*) reports want_nested to VFIO;
*) assert iommu_set/unset_iommu_context() if vIOMMU is not scalable modern.
---
hw/i386/intel_iommu.c | 39 +++++++++++++++++++++++++++++++++++----
hw/i386/intel_iommu_internal.h | 3 +++
include/hw/i386/intel_iommu.h | 2 ++
3 files changed, 40 insertions(+), 4 deletions(-)
diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index 2010c33..9781a18 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -4050,7 +4050,7 @@ static Property vtd_properties[] = {
DEFINE_PROP_UINT8("aw-bits", IntelIOMMUState, aw_bits,
VTD_HOST_ADDRESS_WIDTH),
DEFINE_PROP_BOOL("caching-mode", IntelIOMMUState, caching_mode, FALSE),
- DEFINE_PROP_BOOL("x-scalable-mode", IntelIOMMUState, scalable_mode, FALSE),
+ DEFINE_PROP_STRING("x-scalable-mode", IntelIOMMUState, scalable_mode_str),
DEFINE_PROP_BOOL("dma-drain", IntelIOMMUState, dma_drain, true),
DEFINE_PROP_END_OF_LIST(),
};
@@ -4419,6 +4419,7 @@ VTDAddressSpace *vtd_find_add_as(IntelIOMMUState *s,
PCIBus *bus, int devfn)
static int vtd_dev_get_iommu_attr(PCIBus *bus, void *opaque, int32_t devfn,
IOMMUAttr attr, void *data)
{
+ IntelIOMMUState *s = opaque;
int ret = 0;
assert(0 <= devfn && devfn < PCI_DEVFN_MAX);
@@ -4428,8 +4429,7 @@ static int vtd_dev_get_iommu_attr(PCIBus *bus, void
*opaque, int32_t devfn,
{
bool *pdata = data;
- /* return false until vSVA is ready */
- *pdata = false;
+ *pdata = s->scalable_modern ? true : false;
break;
}
default:
@@ -4523,6 +4523,8 @@ static int vtd_dev_set_iommu_context(PCIBus *bus, void
*opaque,
VTDHostIOMMUContext *vtd_dev_icx;
assert(0 <= devfn && devfn < PCI_DEVFN_MAX);
+ /* only modern scalable supports set_ioimmu_context */
+ assert(s->scalable_modern);
vtd_bus = vtd_find_add_bus(s, bus);
@@ -4557,6 +4559,8 @@ static void vtd_dev_unset_iommu_context(PCIBus *bus, void
*opaque, int devfn)
VTDHostIOMMUContext *vtd_dev_icx;
assert(0 <= devfn && devfn < PCI_DEVFN_MAX);
+ /* only modern scalable supports unset_ioimmu_context */
+ assert(s->scalable_modern);
vtd_bus = vtd_find_add_bus(s, bus);
@@ -4784,8 +4788,13 @@ static void vtd_init(IntelIOMMUState *s)
}
/* TODO: read cap/ecap from host to decide which cap to be exposed. */
- if (s->scalable_mode) {
+ if (s->scalable_mode && !s->scalable_modern) {
s->ecap |= VTD_ECAP_SMTS | VTD_ECAP_SRS | VTD_ECAP_SLTS;
+ } else if (s->scalable_mode && s->scalable_modern) {
+ s->ecap |= VTD_ECAP_SMTS | VTD_ECAP_SRS | VTD_ECAP_PASID |
+ VTD_ECAP_FLTS | VTD_ECAP_PSS(VTD_PASID_SS) |
+ VTD_ECAP_VCS;
+ s->vccap |= VTD_VCCAP_PAS;
}
if (!s->cap_finalized) {
@@ -4926,6 +4935,28 @@ static bool vtd_decide_config(IntelIOMMUState *s, Error
**errp)
return false;
}
+ if (s->scalable_mode_str &&
+ (strcmp(s->scalable_mode_str, "off") &&
+ strcmp(s->scalable_mode_str, "modern") &&
+ strcmp(s->scalable_mode_str, "legacy"))) {
+ error_setg(errp, "Invalid x-scalable-mode config,"
+ "Please use \"modern\", \"legacy\" or \"off\"");
+ return false;
+ }
+
+ if (s->scalable_mode_str &&
+ !strcmp(s->scalable_mode_str, "legacy")) {
+ s->scalable_mode = true;
+ s->scalable_modern = false;
+ } else if (s->scalable_mode_str &&
+ !strcmp(s->scalable_mode_str, "modern")) {
+ s->scalable_mode = true;
+ s->scalable_modern = true;
+ } else {
+ s->scalable_mode = false;
+ s->scalable_modern = false;
+ }
+
return true;
}
diff --git a/hw/i386/intel_iommu_internal.h b/hw/i386/intel_iommu_internal.h
index 9b4fc67..afb4c6a 100644
--- a/hw/i386/intel_iommu_internal.h
+++ b/hw/i386/intel_iommu_internal.h
@@ -197,7 +197,9 @@
#define VTD_ECAP_MHMV (15ULL << 20)
#define VTD_ECAP_SRS (1ULL << 31)
#define VTD_ECAP_SMTS (1ULL << 43)
+#define VTD_ECAP_VCS (1ULL << 44)
#define VTD_ECAP_SLTS (1ULL << 46)
+#define VTD_ECAP_FLTS (1ULL << 47)
/* 1st level related caps */
#define VTD_CAP_FL1GP (1ULL << 56)
@@ -209,6 +211,7 @@
#define VTD_ECAP_PSS(val) (((val) & 0x1fULL) << 35)
#define VTD_ECAP_PASID (1ULL << 40)
+#define VTD_PASID_SS (19)
#define VTD_GET_PSS(val) (((val) >> 35) & 0x1f)
#define VTD_ECAP_PSS_MASK (0x1fULL << 35)
diff --git a/include/hw/i386/intel_iommu.h b/include/hw/i386/intel_iommu.h
index 1aab882..fd64364 100644
--- a/include/hw/i386/intel_iommu.h
+++ b/include/hw/i386/intel_iommu.h
@@ -263,6 +263,8 @@ struct IntelIOMMUState {
bool caching_mode; /* RO - is cap CM enabled? */
bool scalable_mode; /* RO - is Scalable Mode supported? */
+ char *scalable_mode_str; /* RO - admin's Scalable Mode config */
+ bool scalable_modern; /* RO - is modern SM supported? */
dma_addr_t root; /* Current root table pointer */
bool root_scalable; /* Type of root table (scalable or not) */
--
2.7.4
- [RFC v10 13/25] intel_iommu: add virtual command capability support, (continued)
- [RFC v10 13/25] intel_iommu: add virtual command capability support, Liu Yi L, 2020/09/10
- [RFC v10 14/25] intel_iommu: process PASID cache invalidation, Liu Yi L, 2020/09/10
- [RFC v10 16/25] vfio: add bind stage-1 page table support, Liu Yi L, 2020/09/10
- [RFC v10 15/25] intel_iommu: add PASID cache management infrastructure, Liu Yi L, 2020/09/10
- [RFC v10 17/25] intel_iommu: sync IOMMU nesting cap info for assigned devices, Liu Yi L, 2020/09/10
- [RFC v10 20/25] intel_iommu: do not pass down pasid bind for PASID #0, Liu Yi L, 2020/09/10
- [RFC v10 21/25] vfio: add support for flush iommu stage-1 cache, Liu Yi L, 2020/09/10
- [RFC v10 18/25] intel_iommu: bind/unbind guest page table to host, Liu Yi L, 2020/09/10
- [RFC v10 23/25] intel_iommu: propagate PASID-based iotlb invalidation to host, Liu Yi L, 2020/09/10
- [RFC v10 24/25] intel_iommu: process PASID-based Device-TLB invalidation, Liu Yi L, 2020/09/10
- [RFC v10 25/25] intel_iommu: modify x-scalable-mode to be string option,
Liu Yi L <=