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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: |
Thu, 22 Jun 2023 16:26:33 -0400 |
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>
> #endif
> --
> 2.25.1
- Re: [PATCH v4 5/5] amd_iommu: report x2APIC support to the operating system,
Michael S. Tsirkin <=