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a="26721744" X-IronPort-AV: E=Sophos;i="6.11,165,1725346800"; d="scan'208";a="26721744" X-CSE-ConnectionGUID: 0eE3hrHkQsaAqllrJVMV0A== X-CSE-MsgGUID: GfpxLqBgQH6EMzq5BSXK7A== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.11,165,1725346800"; d="scan'208";a="77749598" From: Zhenzhong Duan To: qemu-devel@nongnu.org Cc: alex.williamson@redhat.com, clg@redhat.com, eric.auger@redhat.com, mst@redhat.com, peterx@redhat.com, jasowang@redhat.com, jgg@nvidia.com, nicolinc@nvidia.com, joao.m.martins@oracle.com, clement.mathieu--drif@eviden.com, kevin.tian@intel.com, yi.l.liu@intel.com, chao.p.peng@intel.com, Yi Sun , Zhenzhong Duan , Marcel Apfelbaum , Paolo Bonzini , Richard Henderson , Eduardo Habkost Subject: [PATCH v4 06/17] intel_iommu: Implement stage-1 translation Date: Mon, 30 Sep 2024 17:26:20 +0800 Message-Id: <20240930092631.2997543-7-zhenzhong.duan@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240930092631.2997543-1-zhenzhong.duan@intel.com> References: <20240930092631.2997543-1-zhenzhong.duan@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=198.175.65.21; envelope-from=zhenzhong.duan@intel.com; helo=mgamail.intel.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.095, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @intel.com) X-ZM-MESSAGEID: 1727688760412116600 From: Yi Liu This adds stage-1 page table walking to support stage-1 only translation in scalable modern mode. Signed-off-by: Yi Liu Co-developed-by: Cl=C3=A9ment Mathieu--Drif Signed-off-by: Cl=C3=A9ment Mathieu--Drif Signed-off-by: Yi Sun Signed-off-by: Zhenzhong Duan Acked-by: Jason Wang --- hw/i386/intel_iommu_internal.h | 24 ++++++ hw/i386/intel_iommu.c | 143 ++++++++++++++++++++++++++++++++- 2 files changed, 163 insertions(+), 4 deletions(-) diff --git a/hw/i386/intel_iommu_internal.h b/hw/i386/intel_iommu_internal.h index 20fcc73938..38bf0c7a06 100644 --- a/hw/i386/intel_iommu_internal.h +++ b/hw/i386/intel_iommu_internal.h @@ -428,6 +428,22 @@ typedef union VTDInvDesc VTDInvDesc; #define VTD_SPTE_LPAGE_L3_RSVD_MASK(aw) \ (0x3ffff800ULL | ~(VTD_HAW_MASK(aw) | VTD_SL_IGN_COM)) =20 +/* Rsvd field masks for fpte */ +#define VTD_FS_UPPER_IGNORED 0xfff0000000000000ULL +#define VTD_FPTE_PAGE_L1_RSVD_MASK(aw) \ + (~(VTD_HAW_MASK(aw) | VTD_FS_UPPER_IGNORED)) +#define VTD_FPTE_PAGE_L2_RSVD_MASK(aw) \ + (~(VTD_HAW_MASK(aw) | VTD_FS_UPPER_IGNORED)) +#define VTD_FPTE_PAGE_L3_RSVD_MASK(aw) \ + (~(VTD_HAW_MASK(aw) | VTD_FS_UPPER_IGNORED)) +#define VTD_FPTE_PAGE_L4_RSVD_MASK(aw) \ + (0x80ULL | ~(VTD_HAW_MASK(aw) | VTD_FS_UPPER_IGNORED)) + +#define VTD_FPTE_LPAGE_L2_RSVD_MASK(aw) \ + (0x1fe000ULL | ~(VTD_HAW_MASK(aw) | VTD_FS_UPPER_IGNORED)) +#define VTD_FPTE_LPAGE_L3_RSVD_MASK(aw) \ + (0x3fffe000ULL | ~(VTD_HAW_MASK(aw) | VTD_FS_UPPER_IGNORED)) + /* Masks for PIOTLB Invalidate Descriptor */ #define VTD_INV_DESC_PIOTLB_G (3ULL << 4) #define VTD_INV_DESC_PIOTLB_ALL_IN_PASID (2ULL << 4) @@ -520,6 +536,14 @@ typedef struct VTDRootEntry VTDRootEntry; #define VTD_SM_PASID_ENTRY_AW 7ULL /* Adjusted guest-address-widt= h */ #define VTD_SM_PASID_ENTRY_DID(val) ((val) & VTD_DOMAIN_ID_MASK) =20 +#define VTD_SM_PASID_ENTRY_FLPM 3ULL +#define VTD_SM_PASID_ENTRY_FLPTPTR (~0xfffULL) + +/* First Level Paging Structure */ +/* Masks for First Level Paging Entry */ +#define VTD_FL_P 1ULL +#define VTD_FL_RW (1ULL << 1) + /* Second Level Page Translation Pointer*/ #define VTD_SM_PASID_ENTRY_SLPTPTR (~0xfffULL) =20 diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c index 6f2414898c..56d5933e93 100644 --- a/hw/i386/intel_iommu.c +++ b/hw/i386/intel_iommu.c @@ -48,6 +48,8 @@ =20 /* pe operations */ #define VTD_PE_GET_TYPE(pe) ((pe)->val[0] & VTD_SM_PASID_ENTRY_PGTT) +#define VTD_PE_GET_FL_LEVEL(pe) \ + (4 + (((pe)->val[2] >> 2) & VTD_SM_PASID_ENTRY_FLPM)) #define VTD_PE_GET_SL_LEVEL(pe) \ (2 + (((pe)->val[0] >> 2) & VTD_SM_PASID_ENTRY_AW)) =20 @@ -755,6 +757,11 @@ static inline bool vtd_is_sl_level_supported(IntelIOMM= UState *s, uint32_t level) (1ULL << (level - 2 + VTD_CAP_SAGAW_SHIFT)); } =20 +static inline bool vtd_is_fl_level_supported(IntelIOMMUState *s, uint32_t = level) +{ + return level =3D=3D VTD_PML4_LEVEL; +} + /* Return true if check passed, otherwise false */ static inline bool vtd_pe_type_check(X86IOMMUState *x86_iommu, VTDPASIDEntry *pe) @@ -838,6 +845,11 @@ static int vtd_get_pe_in_pasid_leaf_table(IntelIOMMUSt= ate *s, return -VTD_FR_PASID_TABLE_ENTRY_INV; } =20 + if (pgtt =3D=3D VTD_SM_PASID_ENTRY_FLT && + !vtd_is_fl_level_supported(s, VTD_PE_GET_FL_LEVEL(pe))) { + return -VTD_FR_PASID_TABLE_ENTRY_INV; + } + return 0; } =20 @@ -973,7 +985,11 @@ static uint32_t vtd_get_iova_level(IntelIOMMUState *s, =20 if (s->root_scalable) { vtd_ce_get_rid2pasid_entry(s, ce, &pe, pasid); - return VTD_PE_GET_SL_LEVEL(&pe); + if (s->scalable_modern) { + return VTD_PE_GET_FL_LEVEL(&pe); + } else { + return VTD_PE_GET_SL_LEVEL(&pe); + } } =20 return vtd_ce_get_level(ce); @@ -1060,7 +1076,11 @@ static dma_addr_t vtd_get_iova_pgtbl_base(IntelIOMMU= State *s, =20 if (s->root_scalable) { vtd_ce_get_rid2pasid_entry(s, ce, &pe, pasid); - return pe.val[0] & VTD_SM_PASID_ENTRY_SLPTPTR; + if (s->scalable_modern) { + return pe.val[2] & VTD_SM_PASID_ENTRY_FLPTPTR; + } else { + return pe.val[0] & VTD_SM_PASID_ENTRY_SLPTPTR; + } } =20 return vtd_ce_get_slpt_base(ce); @@ -1862,6 +1882,104 @@ out: trace_vtd_pt_enable_fast_path(source_id, success); } =20 +/* + * Rsvd field masks for fpte: + * vtd_fpte_rsvd 4k pages + * vtd_fpte_rsvd_large large pages + * + * We support only 4-level page tables. + */ +#define VTD_FPTE_RSVD_LEN 5 +static uint64_t vtd_fpte_rsvd[VTD_FPTE_RSVD_LEN]; +static uint64_t vtd_fpte_rsvd_large[VTD_FPTE_RSVD_LEN]; + +static bool vtd_flpte_nonzero_rsvd(uint64_t flpte, uint32_t level) +{ + uint64_t rsvd_mask; + + /* + * We should have caught a guest-mis-programmed level earlier, + * via vtd_is_fl_level_supported. + */ + assert(level < VTD_FPTE_RSVD_LEN); + /* + * Zero level doesn't exist. The smallest level is VTD_PT_LEVEL=3D1 and + * checked by vtd_is_last_pte(). + */ + assert(level); + + if ((level =3D=3D VTD_PD_LEVEL || level =3D=3D VTD_PDP_LEVEL) && + (flpte & VTD_PT_PAGE_SIZE_MASK)) { + /* large page */ + rsvd_mask =3D vtd_fpte_rsvd_large[level]; + } else { + rsvd_mask =3D vtd_fpte_rsvd[level]; + } + + return flpte & rsvd_mask; +} + +static inline bool vtd_flpte_present(uint64_t flpte) +{ + return !!(flpte & VTD_FL_P); +} + +/* + * Given the @iova, get relevant @flptep. @flpte_level will be the last le= vel + * of the translation, can be used for deciding the size of large page. + */ +static int vtd_iova_to_flpte(IntelIOMMUState *s, VTDContextEntry *ce, + uint64_t iova, bool is_write, + uint64_t *flptep, uint32_t *flpte_level, + bool *reads, bool *writes, uint8_t aw_bits, + uint32_t pasid) +{ + dma_addr_t addr =3D vtd_get_iova_pgtbl_base(s, ce, pasid); + uint32_t level =3D vtd_get_iova_level(s, ce, pasid); + uint32_t offset; + uint64_t flpte; + + while (true) { + offset =3D vtd_iova_level_offset(iova, level); + flpte =3D vtd_get_pte(addr, offset); + + if (flpte =3D=3D (uint64_t)-1) { + if (level =3D=3D vtd_get_iova_level(s, ce, pasid)) { + /* Invalid programming of context-entry */ + return -VTD_FR_CONTEXT_ENTRY_INV; + } else { + return -VTD_FR_PAGING_ENTRY_INV; + } + } + if (!vtd_flpte_present(flpte)) { + *reads =3D false; + *writes =3D false; + return -VTD_FR_PAGING_ENTRY_INV; + } + *reads =3D true; + *writes =3D (*writes) && (flpte & VTD_FL_RW); + if (is_write && !(flpte & VTD_FL_RW)) { + return -VTD_FR_WRITE; + } + if (vtd_flpte_nonzero_rsvd(flpte, level)) { + error_report_once("%s: detected flpte reserved non-zero " + "iova=3D0x%" PRIx64 ", level=3D0x%" PRIx32 + "flpte=3D0x%" PRIx64 ", pasid=3D0x%" PRIX32 = ")", + __func__, iova, level, flpte, pasid); + return -VTD_FR_PAGING_ENTRY_RSVD; + } + + if (vtd_is_last_pte(flpte, level)) { + *flptep =3D flpte; + *flpte_level =3D level; + return 0; + } + + addr =3D vtd_get_pte_addr(flpte, aw_bits); + level--; + } +} + static void vtd_report_fault(IntelIOMMUState *s, int err, bool is_fpd_set, uint16_t source_id, @@ -2010,8 +2128,13 @@ static bool vtd_do_iommu_translate(VTDAddressSpace *= vtd_as, PCIBus *bus, } } =20 - ret_fr =3D vtd_iova_to_slpte(s, &ce, addr, is_write, &pte, &level, - &reads, &writes, s->aw_bits, pasid); + if (s->scalable_modern && s->root_scalable) { + ret_fr =3D vtd_iova_to_flpte(s, &ce, addr, is_write, &pte, &level, + &reads, &writes, s->aw_bits, pasid); + } else { + ret_fr =3D vtd_iova_to_slpte(s, &ce, addr, is_write, &pte, &level, + &reads, &writes, s->aw_bits, pasid); + } if (ret_fr) { vtd_report_fault(s, -ret_fr, is_fpd_set, source_id, addr, is_write, pasid !=3D PCI_NO_PASID, pasid); @@ -4239,6 +4362,18 @@ static void vtd_init(IntelIOMMUState *s) vtd_spte_rsvd_large[2] =3D VTD_SPTE_LPAGE_L2_RSVD_MASK(s->aw_bits); vtd_spte_rsvd_large[3] =3D VTD_SPTE_LPAGE_L3_RSVD_MASK(s->aw_bits); =20 + /* + * Rsvd field masks for fpte + */ + vtd_fpte_rsvd[0] =3D ~0ULL; + vtd_fpte_rsvd[1] =3D VTD_FPTE_PAGE_L1_RSVD_MASK(s->aw_bits); + vtd_fpte_rsvd[2] =3D VTD_FPTE_PAGE_L2_RSVD_MASK(s->aw_bits); + vtd_fpte_rsvd[3] =3D VTD_FPTE_PAGE_L3_RSVD_MASK(s->aw_bits); + vtd_fpte_rsvd[4] =3D VTD_FPTE_PAGE_L4_RSVD_MASK(s->aw_bits); + + vtd_fpte_rsvd_large[2] =3D VTD_FPTE_LPAGE_L2_RSVD_MASK(s->aw_bits); + vtd_fpte_rsvd_large[3] =3D VTD_FPTE_LPAGE_L3_RSVD_MASK(s->aw_bits); + if (s->scalable_mode || s->snoop_control) { vtd_spte_rsvd[1] &=3D ~VTD_SPTE_SNP; vtd_spte_rsvd_large[2] &=3D ~VTD_SPTE_SNP; --=20 2.34.1