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Re: [PATCH v4 5/5] amd_iommu: report x2APIC support to the operating sys
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From: |
Michael S. Tsirkin |
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Subject: |
Re: [PATCH v4 5/5] amd_iommu: report x2APIC support to the operating system |
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Date: |
Mon, 10 Jul 2023 14:37:18 -0400 |
On Fri, Jun 23, 2023 at 10:28:43PM +0700, Bui Quang Minh wrote:
> On 6/23/23 03:26, Michael S. Tsirkin wrote:
> > On Mon, May 22, 2023 at 11:31:57PM +0700, Bui Quang Minh wrote:
> > > This commit adds XTSup configuration to let user choose to whether enable
> > > this feature or not. When XTSup is enabled, additional bytes in IRTE with
> > > enabled guest virtual VAPIC are used to support 32-bit destination id.
> > >
> > > Additionally, this commit exports IVHD type 0x11 besides the old IVHD type
> > > 0x10 in ACPI table. IVHD type 0x10 does not report full set of IOMMU
> > > features only the legacy ones, so operating system (e.g. Linux) may only
> > > detects x2APIC support if IVHD type 0x11 is available. The IVHD type 0x10
> > > is kept so that old operating system that only parses type 0x10 can detect
> > > the IOMMU device.
> > >
> > > Signed-off-by: Bui Quang Minh <minhquangbui99@gmail.com>
> > > ---
> > > hw/i386/acpi-build.c | 127 ++++++++++++++++++++++++++-----------------
> > > hw/i386/amd_iommu.c | 21 ++++++-
> > > hw/i386/amd_iommu.h | 16 ++++--
> > > 3 files changed, 108 insertions(+), 56 deletions(-)
> > >
> > > diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
> > > index 512162003b..4459122e56 100644
> > > --- a/hw/i386/acpi-build.c
> > > +++ b/hw/i386/acpi-build.c
> > > @@ -2339,30 +2339,23 @@ static void
> > > build_amd_iommu(GArray *table_data, BIOSLinker *linker, const char
> > > *oem_id,
> > > const char *oem_table_id)
> > > {
> > > - int ivhd_table_len = 24;
> > > AMDVIState *s = AMD_IOMMU_DEVICE(x86_iommu_get_default());
> > > GArray *ivhd_blob = g_array_new(false, true, 1);
> > > AcpiTable table = { .sig = "IVRS", .rev = 1, .oem_id = oem_id,
> > > .oem_table_id = oem_table_id };
> > > + uint64_t feature_report;
> > > acpi_table_begin(&table, table_data);
> > > /* IVinfo - IO virtualization information common to all
> > > * IOMMU units in a system
> > > */
> > > - build_append_int_noprefix(table_data, 40UL << 8/* PASize */, 4);
> > > + build_append_int_noprefix(table_data,
> > > + (1UL << 0) | /* EFRSup */
> > > + (40UL << 8), /* PASize */
> > > + 4);
> > > /* reserved */
> > > build_append_int_noprefix(table_data, 0, 8);
> > > - /* IVHD definition - type 10h */
> > > - build_append_int_noprefix(table_data, 0x10, 1);
> > > - /* virtualization flags */
> > > - build_append_int_noprefix(table_data,
> > > - (1UL << 0) | /* HtTunEn */
> > > - (1UL << 4) | /* iotblSup */
> > > - (1UL << 6) | /* PrefSup */
> > > - (1UL << 7), /* PPRSup */
> > > - 1);
> > > -
> > > /*
> > > * A PCI bus walk, for each PCI host bridge, is necessary to create
> > > a
> > > * complete set of IVHD entries. Do this into a separate blob so
> > > that we
> > > @@ -2382,56 +2375,92 @@ build_amd_iommu(GArray *table_data, BIOSLinker
> > > *linker, const char *oem_id,
> > > build_append_int_noprefix(ivhd_blob, 0x0000001, 4);
> > > }
> > > - ivhd_table_len += ivhd_blob->len;
> > > -
> > > /*
> > > * When interrupt remapping is supported, we add a special IVHD
> > > device
> > > - * for type IO-APIC.
> > > - */
> > > - if (x86_iommu_ir_supported(x86_iommu_get_default())) {
> > > - ivhd_table_len += 8;
> > > - }
> > > -
> > > - /* IVHD length */
> > > - build_append_int_noprefix(table_data, ivhd_table_len, 2);
> > > - /* DeviceID */
> > > - build_append_int_noprefix(table_data,
> > > - object_property_get_int(OBJECT(&s->pci),
> > > "addr",
> > > - &error_abort), 2);
> > > - /* Capability offset */
> > > - build_append_int_noprefix(table_data, s->pci.capab_offset, 2);
> > > - /* IOMMU base address */
> > > - build_append_int_noprefix(table_data, s->mmio.addr, 8);
> > > - /* PCI Segment Group */
> > > - build_append_int_noprefix(table_data, 0, 2);
> > > - /* IOMMU info */
> > > - build_append_int_noprefix(table_data, 0, 2);
> > > - /* IOMMU Feature Reporting */
> > > - build_append_int_noprefix(table_data,
> > > - (48UL << 30) | /* HATS */
> > > - (48UL << 28) | /* GATS */
> > > - (1UL << 2) | /* GTSup */
> > > - (1UL << 6), /* GASup */
> > > - 4);
> > > -
> > > - /* IVHD entries as found above */
> > > - g_array_append_vals(table_data, ivhd_blob->data, ivhd_blob->len);
> > > - g_array_free(ivhd_blob, TRUE);
> > > -
> > > - /*
> > > - * Add a special IVHD device type.
> > > + * for type IO-APIC
> > > * Refer to spec - Table 95: IVHD device entry type codes
> > > *
> > > * Linux IOMMU driver checks for the special IVHD device (type
> > > IO-APIC).
> > > * See Linux kernel commit
> > > 'c2ff5cf5294bcbd7fa50f7d860e90a66db7e5059'
> > > */
> > > if (x86_iommu_ir_supported(x86_iommu_get_default())) {
> > > - build_append_int_noprefix(table_data,
> > > + build_append_int_noprefix(ivhd_blob,
> > > (0x1ull << 56) | /* type
> > > IOAPIC */
> > > (IOAPIC_SB_DEVID << 40) | /* IOAPIC
> > > devid */
> > > 0x48, /* special
> > > device */
> > > 8);
> > > }
> > > +
> > > + /* IVHD definition - type 10h */
> > > + build_append_int_noprefix(table_data, 0x10, 1);
> > > + /* virtualization flags */
> > > + build_append_int_noprefix(table_data,
> > > + (1UL << 0) | /* HtTunEn */
> > > + (1UL << 4) | /* iotblSup */
> > > + (1UL << 6) | /* PrefSup */
> > > + (1UL << 7), /* PPRSup */
> > > + 1);
> > > +
> > > + /* IVHD length */
> > > + build_append_int_noprefix(table_data, ivhd_blob->len + 24, 2);
> > > + /* DeviceID */
> > > + build_append_int_noprefix(table_data,
> > > + object_property_get_int(OBJECT(&s->pci),
> > > "addr",
> > > + &error_abort), 2);
> > > + /* Capability offset */
> > > + build_append_int_noprefix(table_data, s->pci.capab_offset, 2);
> > > + /* IOMMU base address */
> > > + build_append_int_noprefix(table_data, s->mmio.addr, 8);
> > > + /* PCI Segment Group */
> > > + build_append_int_noprefix(table_data, 0, 2);
> > > + /* IOMMU info */
> > > + build_append_int_noprefix(table_data, 0, 2);
> > > + /* IOMMU Feature Reporting */
> > > + feature_report = (48UL << 30) | /* HATS */
> > > + (48UL << 28) | /* GATS */
> > > + (1UL << 2) | /* GTSup */
> > > + (1UL << 6); /* GASup */
> > > + if (s->xtsup) {
> > > + feature_report |= (1UL << 0); /* XTSup */
> > > + }
> > > + build_append_int_noprefix(table_data, feature_report, 4);
> > > +
> > > + /* IVHD entries as found above */
> > > + g_array_append_vals(table_data, ivhd_blob->data, ivhd_blob->len);
> > > +
> > > + /* IVHD definition - type 11h */
> > > + build_append_int_noprefix(table_data, 0x11, 1);
> > > + /* virtualization flags */
> > > + build_append_int_noprefix(table_data,
> > > + (1UL << 0) | /* HtTunEn */
> > > + (1UL << 4), /* iotblSup */
> > > + 1);
> > > +
> > > + /* IVHD length */
> > > + build_append_int_noprefix(table_data, ivhd_blob->len + 40, 2);
> > > + /* DeviceID */
> > > + build_append_int_noprefix(table_data,
> > > + object_property_get_int(OBJECT(&s->pci),
> > > "addr",
> > > + &error_abort), 2);
> > > + /* Capability offset */
> > > + build_append_int_noprefix(table_data, s->pci.capab_offset, 2);
> > > + /* IOMMU base address */
> > > + build_append_int_noprefix(table_data, s->mmio.addr, 8);
> > > + /* PCI Segment Group */
> > > + build_append_int_noprefix(table_data, 0, 2);
> > > + /* IOMMU info */
> > > + build_append_int_noprefix(table_data, 0, 2);
> > > + /* IOMMU Attributes */
> > > + build_append_int_noprefix(table_data, 0, 4);
> > > + /* EFR Register Image */
> > > + build_append_int_noprefix(table_data, s->efr_reg, 8);
> > > + /* EFR Register Image 2 */
> > > + build_append_int_noprefix(table_data, 0, 8);
> > > +
> > > + /* IVHD entries as found above */
> > > + g_array_append_vals(table_data, ivhd_blob->data, ivhd_blob->len);
> > > +
> > > + g_array_free(ivhd_blob, TRUE);
> > > acpi_table_end(linker, &table);
> > > }
> > > diff --git a/hw/i386/amd_iommu.c b/hw/i386/amd_iommu.c
> > > index 9c77304438..0e308184d7 100644
> > > --- a/hw/i386/amd_iommu.c
> > > +++ b/hw/i386/amd_iommu.c
> > > @@ -31,6 +31,7 @@
> > > #include "hw/i386/apic_internal.h"
> > > #include "trace.h"
> > > #include "hw/i386/apic-msidef.h"
> > > +#include "hw/qdev-properties.h"
> > > /* used AMD-Vi MMIO registers */
> > > const char *amdvi_mmio_low[] = {
> > > @@ -1155,7 +1156,12 @@ static int amdvi_int_remap_ga(AMDVIState *iommu,
> > > irq->vector = irte.hi.fields.vector;
> > > irq->dest_mode = irte.lo.fields_remap.dm;
> > > irq->redir_hint = irte.lo.fields_remap.rq_eoi;
> > > - irq->dest = irte.lo.fields_remap.destination;
> > > + if (iommu->xtsup) {
> > > + irq->dest = irte.lo.fields_remap.destination |
> > > + (irte.hi.fields.destination_hi << 24);
> > > + } else {
> > > + irq->dest = irte.lo.fields_remap.destination & 0xff;
> > > + }
> > > return 0;
> > > }
> > > @@ -1503,10 +1509,15 @@ static void amdvi_init(AMDVIState *s)
> > > s->enabled = false;
> > > s->ats_enabled = false;
> > > s->cmdbuf_enabled = false;
> > > + s->efr_reg = AMDVI_DEFAULT_EXT_FEATURES;
> > > +
> > > + if (s->xtsup) {
> > > + s->efr_reg |= AMDVI_FEATURE_XT;
> > > + }
> > > /* reset MMIO */
> > > memset(s->mmior, 0, AMDVI_MMIO_SIZE);
> > > - amdvi_set_quad(s, AMDVI_MMIO_EXT_FEATURES, AMDVI_EXT_FEATURES,
> > > + amdvi_set_quad(s, AMDVI_MMIO_EXT_FEATURES, s->efr_reg,
> > > 0xffffffffffffffef, 0);
> > > amdvi_set_quad(s, AMDVI_MMIO_STATUS, 0, 0x98, 0x67);
> > > }
> > > @@ -1591,6 +1602,11 @@ static void amdvi_sysbus_realize(DeviceState *dev,
> > > Error **errp)
> > > amdvi_init(s);
> > > }
> > > +static Property amdvi_properties[] = {
> > > + DEFINE_PROP_BOOL("xtsup", AMDVIState, xtsup, false),
> > > + DEFINE_PROP_END_OF_LIST(),
> > > +};
> > > +
> > > static const VMStateDescription vmstate_amdvi_sysbus = {
> > > .name = "amd-iommu",
> > > .unmigratable = 1
> > > @@ -1617,6 +1633,7 @@ static void amdvi_sysbus_class_init(ObjectClass
> > > *klass, void *data)
> > > dc->user_creatable = true;
> > > set_bit(DEVICE_CATEGORY_MISC, dc->categories);
> > > dc->desc = "AMD IOMMU (AMD-Vi) DMA Remapping device";
> > > + device_class_set_props(dc, amdvi_properties);
> > > }
> > > static const TypeInfo amdvi_sysbus = {
> > > diff --git a/hw/i386/amd_iommu.h b/hw/i386/amd_iommu.h
> > > index 6da893ee57..f3730db990 100644
> > > --- a/hw/i386/amd_iommu.h
> > > +++ b/hw/i386/amd_iommu.h
> > > @@ -154,6 +154,7 @@
> > > #define AMDVI_FEATURE_PREFETCH (1ULL << 0) /* page prefetch
> > > */
> > > #define AMDVI_FEATURE_PPR (1ULL << 1) /* PPR Support
> > > */
> > > +#define AMDVI_FEATURE_XT (1ULL << 2) /* x2APIC Support
> > > */
> > > #define AMDVI_FEATURE_GT (1ULL << 4) /* Guest
> > > Translation */
> > > #define AMDVI_FEATURE_IA (1ULL << 6) /* inval all
> > > support */
> > > #define AMDVI_FEATURE_GA (1ULL << 7) /* guest VAPIC
> > > support */
> > > @@ -173,8 +174,9 @@
> > > #define AMDVI_IOTLB_MAX_SIZE 1024
> > > #define AMDVI_DEVID_SHIFT 36
> > > -/* extended feature support */
> > > -#define AMDVI_EXT_FEATURES (AMDVI_FEATURE_PREFETCH | AMDVI_FEATURE_PPR |
> > > \
> > > +/* default extended feature */
> > > +#define AMDVI_DEFAULT_EXT_FEATURES \
> > > + (AMDVI_FEATURE_PREFETCH | AMDVI_FEATURE_PPR | \
> > > AMDVI_FEATURE_IA | AMDVI_FEATURE_GT | AMDVI_FEATURE_HE | \
> > > AMDVI_GATS_MODE | AMDVI_HATS_MODE | AMDVI_FEATURE_GA)
> > > @@ -278,8 +280,8 @@ union irte_ga_lo {
> > > dm:1,
> > > /* ------ */
> > > guest_mode:1,
> > > - destination:8,
> > > - rsvd_1:48;
> > > + destination:24,
> > > + rsvd_1:32;
> > > } fields_remap;
> > > };
> > > @@ -287,7 +289,8 @@ union irte_ga_hi {
> > > uint64_t val;
> > > struct {
> > > uint64_t vector:8,
> > > - rsvd_2:56;
> > > + rsvd_2:48,
> > > + destination_hi:8;
> > > } fields;
> > > };
> > > @@ -366,6 +369,9 @@ struct AMDVIState {
> > > /* Interrupt remapping */
> > > bool ga_enabled;
> > > + bool xtsup;
> > > +
> > > + uint64_t efr_reg; /* extended feature register */
> > > };
> >
> > It would be cleaner to have efr_reg as a function and just call it
> > when needed.
> >
> > With that addressed:
> >
> > Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
>
> You mean function like this
>
> uint64_t amdvi_extended_feature_register(AMDVIState *s)
> {
> uint64_t feature = AMDVI_DEFAULT_EXT_FEATURES;
> if (s->xtsup)
> feature |= AMDVI_FEATURE_XT;
>
> return feature;
> }
Yes exactly. going to do that?
> > > #endif
> > > --
> > > 2.25.1
> >
- Re: [PATCH v4 5/5] amd_iommu: report x2APIC support to the operating system,
Michael S. Tsirkin <=