From patchwork Sat Feb 22 08:07:11 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yi Liu X-Patchwork-Id: 11397847 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 21AAB1892 for ; Sat, 22 Feb 2020 08:02:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F38D2208C3 for ; Sat, 22 Feb 2020 08:02:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727126AbgBVICA (ORCPT ); Sat, 22 Feb 2020 03:02:00 -0500 Received: from mga04.intel.com ([192.55.52.120]:65092 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727086AbgBVIB7 (ORCPT ); Sat, 22 Feb 2020 03:01:59 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga006.jf.intel.com ([10.7.209.51]) by fmsmga104.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 22 Feb 2020 00:01:58 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.70,471,1574150400"; d="scan'208";a="240547680" Received: from jacob-builder.jf.intel.com ([10.7.199.155]) by orsmga006.jf.intel.com with ESMTP; 22 Feb 2020 00:01:57 -0800 From: Liu Yi L To: qemu-devel@nongnu.org, alex.williamson@redhat.com, peterx@redhat.com Cc: pbonzini@redhat.com, mst@redhat.com, eric.auger@redhat.com, david@gibson.dropbear.id.au, kevin.tian@intel.com, yi.l.liu@intel.com, jun.j.tian@intel.com, yi.y.sun@intel.com, kvm@vger.kernel.org, Jacob Pan , Yi Sun , Richard Henderson , Eduardo Habkost Subject: [RFC v3.1 10/22] intel_iommu: add virtual command capability support Date: Sat, 22 Feb 2020 00:07:11 -0800 Message-Id: <1582358843-51931-11-git-send-email-yi.l.liu@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1582358843-51931-1-git-send-email-yi.l.liu@intel.com> References: <1582358843-51931-1-git-send-email-yi.l.liu@intel.com> Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org This patch adds virtual command support to Intel vIOMMU per Intel VT-d 3.1 spec. And adds two virtual commands: allocate pasid and free pasid. Cc: Kevin Tian Cc: Jacob Pan Cc: Peter Xu Cc: Yi Sun Cc: Paolo Bonzini Cc: Richard Henderson Cc: Eduardo Habkost Reviewed-by: Peter Xu Signed-off-by: Liu Yi L Signed-off-by: Yi Sun --- hw/i386/intel_iommu.c | 166 +++++++++++++++++++++++++++++++++++++++++ hw/i386/intel_iommu_internal.h | 37 +++++++++ hw/i386/trace-events | 1 + include/hw/i386/intel_iommu.h | 6 +- 4 files changed, 209 insertions(+), 1 deletion(-) diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c index 6258c58..fcb80cd 100644 --- a/hw/i386/intel_iommu.c +++ b/hw/i386/intel_iommu.c @@ -2649,6 +2649,148 @@ static void vtd_handle_iectl_write(IntelIOMMUState *s) } } +static int vtd_request_pasid_alloc(IntelIOMMUState *s, uint32_t *pasid) +{ + VTDBus *vtd_bus; + int bus_n, devfn, ret = -1; + + for (bus_n = 0; bus_n < PCI_BUS_MAX; bus_n++) { + vtd_bus = vtd_find_as_from_bus_num(s, bus_n); + if (!vtd_bus) { + continue; + } + for (devfn = 0; devfn < PCI_DEVFN_MAX; devfn++) { + HostIOMMUContext *host_icx; + PCIDevice *dev; + + dev = vtd_bus->bus->devices[devfn]; + host_icx = pci_device_host_iommu_context(dev); + if (!host_icx) { + continue; + } + + /* + * We'll return the first valid result we got. It's + * a bit hackish in that we don't have a good global + * interface yet to talk to modules like vfio to deliver + * this allocation request, so we're leveraging this + * per-device iommu context to do the same thing just + * to make sure the allocation happens only once. + */ + ret = host_iommu_ctx_pasid_alloc(host_icx, VTD_MIN_HPASID, + VTD_MAX_HPASID, pasid); + if (!ret) { + break; + } + } + } + return ret; +} + +static int vtd_request_pasid_free(IntelIOMMUState *s, uint32_t pasid) +{ + VTDBus *vtd_bus; + int bus_n, devfn, ret = -1; + + for (bus_n = 0; bus_n < PCI_BUS_MAX; bus_n++) { + vtd_bus = vtd_find_as_from_bus_num(s, bus_n); + if (!vtd_bus) { + continue; + } + for (devfn = 0; devfn < PCI_DEVFN_MAX; devfn++) { + HostIOMMUContext *host_icx; + PCIDevice *dev; + + dev = vtd_bus->bus->devices[devfn]; + host_icx = pci_device_host_iommu_context(dev); + if (!host_icx) { + continue; + } + /* + * Similar with pasid allocation. We'll free the pasid + * on the first successful free operation. It's a bit + * hackish in that we don't have a good global interface + * yet to talk to modules like vfio to deliver this pasid + * free request, so we're leveraging this per-device iommu + * context to do the same thing just to make sure the free + * happens only once. + */ + ret = host_iommu_ctx_pasid_free(host_icx, pasid); + if (!ret) { + break; + } + } + } + return ret; +} + +/* + * If IP is not set, set it then return. + * If IP is already set, return. + */ +static void vtd_vcmd_set_ip(IntelIOMMUState *s) +{ + s->vcrsp = 1; + vtd_set_quad_raw(s, DMAR_VCRSP_REG, + ((uint64_t) s->vcrsp)); +} + +static void vtd_vcmd_clear_ip(IntelIOMMUState *s) +{ + s->vcrsp &= (~((uint64_t)(0x1))); + vtd_set_quad_raw(s, DMAR_VCRSP_REG, + ((uint64_t) s->vcrsp)); +} + +/* Handle write to Virtual Command Register */ +static int vtd_handle_vcmd_write(IntelIOMMUState *s, uint64_t val) +{ + uint32_t pasid; + int ret = -1; + + trace_vtd_reg_write_vcmd(s->vcrsp, val); + + if (!(s->vccap & VTD_VCCAP_PAS) || + (s->vcrsp & 1)) { + return -1; + } + + /* + * Since vCPU should be blocked when the guest VMCD + * write was trapped to here. Should be no other vCPUs + * try to access VCMD if guest software is well written. + * However, we still emulate the IP bit here in case of + * bad guest software. Also align with the spec. + */ + vtd_vcmd_set_ip(s); + + switch (val & VTD_VCMD_CMD_MASK) { + case VTD_VCMD_ALLOC_PASID: + ret = vtd_request_pasid_alloc(s, &pasid); + if (ret) { + s->vcrsp |= VTD_VCRSP_SC(VTD_VCMD_NO_AVAILABLE_PASID); + } else { + s->vcrsp |= VTD_VCRSP_RSLT(pasid); + } + break; + + case VTD_VCMD_FREE_PASID: + pasid = VTD_VCMD_PASID_VALUE(val); + ret = vtd_request_pasid_free(s, pasid); + if (ret < 0) { + s->vcrsp |= VTD_VCRSP_SC(VTD_VCMD_FREE_INVALID_PASID); + } + break; + + default: + s->vcrsp |= VTD_VCRSP_SC(VTD_VCMD_UNDEFINED_CMD); + error_report_once("Virtual Command: unsupported command!!!"); + break; + } + vtd_vcmd_clear_ip(s); + return 0; +} + static uint64_t vtd_mem_read(void *opaque, hwaddr addr, unsigned size) { IntelIOMMUState *s = opaque; @@ -2937,6 +3079,23 @@ static void vtd_mem_write(void *opaque, hwaddr addr, vtd_set_long(s, addr, val); break; + case DMAR_VCMD_REG: + if (!vtd_handle_vcmd_write(s, val)) { + if (size == 4) { + vtd_set_long(s, addr, val); + } else { + vtd_set_quad(s, addr, val); + } + } + break; + + case DMAR_VCMD_REG_HI: + assert(size == 4); + if (!vtd_handle_vcmd_write(s, val)) { + vtd_set_long(s, addr, val); + } + break; + default: if (size == 4) { vtd_set_long(s, addr, val); @@ -3697,6 +3856,13 @@ static void vtd_init(IntelIOMMUState *s) * Interrupt remapping registers. */ vtd_define_quad(s, DMAR_IRTA_REG, 0, 0xfffffffffffff80fULL, 0); + + /* + * Virtual Command Definitions + */ + vtd_define_quad(s, DMAR_VCCAP_REG, s->vccap, 0, 0); + vtd_define_quad(s, DMAR_VCMD_REG, 0, 0xffffffffffffffffULL, 0); + vtd_define_quad(s, DMAR_VCRSP_REG, 0, 0, 0); } /* Should not reset address_spaces when reset because devices will still use diff --git a/hw/i386/intel_iommu_internal.h b/hw/i386/intel_iommu_internal.h index 862033e..1d997a1 100644 --- a/hw/i386/intel_iommu_internal.h +++ b/hw/i386/intel_iommu_internal.h @@ -85,6 +85,12 @@ #define DMAR_MTRRCAP_REG_HI 0x104 #define DMAR_MTRRDEF_REG 0x108 /* MTRR default type */ #define DMAR_MTRRDEF_REG_HI 0x10c +#define DMAR_VCCAP_REG 0xE00 /* Virtual Command Capability Register */ +#define DMAR_VCCAP_REG_HI 0xE04 +#define DMAR_VCMD_REG 0xE10 /* Virtual Command Register */ +#define DMAR_VCMD_REG_HI 0xE14 +#define DMAR_VCRSP_REG 0xE20 /* Virtual Command Reponse Register */ +#define DMAR_VCRSP_REG_HI 0xE24 /* IOTLB registers */ #define DMAR_IOTLB_REG_OFFSET 0xf0 /* Offset to the IOTLB registers */ @@ -312,6 +318,37 @@ typedef enum VTDFaultReason { #define VTD_CONTEXT_CACHE_GEN_MAX 0xffffffffUL +/* VCCAP_REG */ +#define VTD_VCCAP_PAS (1UL << 0) + +/* + * The basic idea is to let hypervisor to set a range for available + * PASIDs for VMs. One of the reasons is PASID #0 is reserved by + * RID_PASID usage. We have no idea how many reserved PASIDs in future, + * so here just an evaluated value. Honestly, set it as "1" is enough + * at current stage. + */ +#define VTD_MIN_HPASID 1 +#define VTD_MAX_HPASID 0xFFFFF + +/* Virtual Command Register */ +enum { + VTD_VCMD_NULL_CMD = 0, + VTD_VCMD_ALLOC_PASID = 1, + VTD_VCMD_FREE_PASID = 2, + VTD_VCMD_CMD_NUM, +}; + +#define VTD_VCMD_CMD_MASK 0xffUL +#define VTD_VCMD_PASID_VALUE(val) (((val) >> 8) & 0xfffff) + +#define VTD_VCRSP_RSLT(val) ((val) << 8) +#define VTD_VCRSP_SC(val) (((val) & 0x3) << 1) + +#define VTD_VCMD_UNDEFINED_CMD 1ULL +#define VTD_VCMD_NO_AVAILABLE_PASID 2ULL +#define VTD_VCMD_FREE_INVALID_PASID 2ULL + /* Interrupt Entry Cache Invalidation Descriptor: VT-d 6.5.2.7. */ struct VTDInvDescIEC { uint32_t type:4; /* Should always be 0x4 */ diff --git a/hw/i386/trace-events b/hw/i386/trace-events index e48bef2..71536a7 100644 --- a/hw/i386/trace-events +++ b/hw/i386/trace-events @@ -51,6 +51,7 @@ vtd_reg_write_gcmd(uint32_t status, uint32_t val) "status 0x%"PRIx32" value 0x%" vtd_reg_write_fectl(uint32_t value) "value 0x%"PRIx32 vtd_reg_write_iectl(uint32_t value) "value 0x%"PRIx32 vtd_reg_ics_clear_ip(void) "" +vtd_reg_write_vcmd(uint32_t status, uint32_t val) "status 0x%"PRIx32" value 0x%"PRIx32 vtd_dmar_translate(uint8_t bus, uint8_t slot, uint8_t func, uint64_t iova, uint64_t gpa, uint64_t mask) "dev %02x:%02x.%02x iova 0x%"PRIx64" -> gpa 0x%"PRIx64" mask 0x%"PRIx64 vtd_dmar_enable(bool en) "enable %d" vtd_dmar_fault(uint16_t sid, int fault, uint64_t addr, bool is_write) "sid 0x%"PRIx16" fault %d addr 0x%"PRIx64" write %d" diff --git a/include/hw/i386/intel_iommu.h b/include/hw/i386/intel_iommu.h index 66b931e..d8a79d3 100644 --- a/include/hw/i386/intel_iommu.h +++ b/include/hw/i386/intel_iommu.h @@ -46,7 +46,7 @@ #define VTD_SID_TO_BUS(sid) (((sid) >> 8) & 0xff) #define VTD_SID_TO_DEVFN(sid) ((sid) & 0xff) -#define DMAR_REG_SIZE 0x230 +#define DMAR_REG_SIZE 0xF00 #define VTD_HOST_AW_39BIT 39 #define VTD_HOST_AW_48BIT 48 #define VTD_HOST_ADDRESS_WIDTH VTD_HOST_AW_39BIT @@ -271,6 +271,10 @@ struct IntelIOMMUState { uint8_t aw_bits; /* Host/IOVA address width (in bits) */ bool dma_drain; /* Whether DMA r/w draining enabled */ + /* Virtual Command Register */ + uint64_t vccap; /* The value of vcmd capability reg */ + uint64_t vcrsp; /* Current value of VCMD RSP REG */ + /* * Protects IOMMU states in general. Currently it protects the * per-IOMMU IOTLB cache, and context entry cache in VTDAddressSpace.