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[2403:580b:97e8:0:321:6fb2:58f1:a1b1]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-21c2d3d6fbbsm8563595ad.168.2025.01.16.21.58.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 16 Jan 2025 21:58:42 -0800 (PST) From: Alistair Francis X-Google-Original-From: Alistair Francis To: qemu-devel@nongnu.org Cc: alistair23@gmail.com, Jason Chien , Daniel Henrique Barboza , Alistair Francis Subject: [PULL 48/50] hw/riscv/riscv-iommu.c: Introduce a translation tag for the page table cache Date: Fri, 17 Jan 2025 15:55:50 +1000 Message-ID: <20250117055552.108376-49-alistair.francis@wdc.com> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20250117055552.108376-1-alistair.francis@wdc.com> References: <20250117055552.108376-1-alistair.francis@wdc.com> MIME-Version: 1.0 Received-SPF: pass client-ip=2607:f8b0:4864:20::629; envelope-from=alistair23@gmail.com; helo=mail-pl1-x629.google.com X-Spam_score_int: -17 X-Spam_score: -1.8 X-Spam_bar: - X-Spam_report: (-1.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_ENVFROM_END_DIGIT=0.25, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, 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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: Jason Chien This commit introduces a translation tag to avoid invalidating an entry that should not be invalidated when IOMMU executes invalidation commands. E.g. IOTINVAL.VMA with GV=0, AV=0, PSCV=1 invalidates both a mapping of single stage translation and a mapping of nested translation with the same PSCID, but only the former one should be invalidated. Signed-off-by: Jason Chien Reviewed-by: Daniel Henrique Barboza Message-ID: <20241108110147.11178-1-jason.chien@sifive.com> Signed-off-by: Alistair Francis --- hw/riscv/riscv-iommu.c | 205 ++++++++++++++++++++++++++++++----------- 1 file changed, 153 insertions(+), 52 deletions(-) diff --git a/hw/riscv/riscv-iommu.c b/hw/riscv/riscv-iommu.c index 8bf920deab..e7568ca227 100644 --- a/hw/riscv/riscv-iommu.c +++ b/hw/riscv/riscv-iommu.c @@ -64,8 +64,16 @@ struct RISCVIOMMUContext { uint64_t msiptp; /* MSI redirection page table pointer */ }; +typedef enum RISCVIOMMUTransTag { + RISCV_IOMMU_TRANS_TAG_BY, /* Bypass */ + RISCV_IOMMU_TRANS_TAG_SS, /* Single Stage */ + RISCV_IOMMU_TRANS_TAG_VG, /* G-stage only */ + RISCV_IOMMU_TRANS_TAG_VN, /* Nested translation */ +} RISCVIOMMUTransTag; + /* Address translation cache entry */ struct RISCVIOMMUEntry { + RISCVIOMMUTransTag tag; /* Translation Tag */ uint64_t iova:44; /* IOVA Page Number */ uint64_t pscid:20; /* Process Soft-Context identifier */ uint64_t phys:44; /* Physical Page Number */ @@ -1227,7 +1235,7 @@ static gboolean riscv_iommu_iot_equal(gconstpointer v1, gconstpointer v2) RISCVIOMMUEntry *t1 = (RISCVIOMMUEntry *) v1; RISCVIOMMUEntry *t2 = (RISCVIOMMUEntry *) v2; return t1->gscid == t2->gscid && t1->pscid == t2->pscid && - t1->iova == t2->iova; + t1->iova == t2->iova && t1->tag == t2->tag; } static guint riscv_iommu_iot_hash(gconstpointer v) @@ -1236,67 +1244,115 @@ static guint riscv_iommu_iot_hash(gconstpointer v) return (guint)t->iova; } -/* GV: 1 PSCV: 1 AV: 1 */ +/* GV: 0 AV: 0 PSCV: 0 GVMA: 0 */ +/* GV: 0 AV: 0 GVMA: 1 */ +static +void riscv_iommu_iot_inval_all(gpointer key, gpointer value, gpointer data) +{ + RISCVIOMMUEntry *iot = (RISCVIOMMUEntry *) value; + RISCVIOMMUEntry *arg = (RISCVIOMMUEntry *) data; + if (iot->tag == arg->tag) { + iot->perm = IOMMU_NONE; + } +} + +/* GV: 0 AV: 0 PSCV: 1 GVMA: 0 */ +static +void riscv_iommu_iot_inval_pscid(gpointer key, gpointer value, gpointer data) +{ + RISCVIOMMUEntry *iot = (RISCVIOMMUEntry *) value; + RISCVIOMMUEntry *arg = (RISCVIOMMUEntry *) data; + if (iot->tag == arg->tag && + iot->pscid == arg->pscid) { + iot->perm = IOMMU_NONE; + } +} + +/* GV: 0 AV: 1 PSCV: 0 GVMA: 0 */ +static +void riscv_iommu_iot_inval_iova(gpointer key, gpointer value, gpointer data) +{ + RISCVIOMMUEntry *iot = (RISCVIOMMUEntry *) value; + RISCVIOMMUEntry *arg = (RISCVIOMMUEntry *) data; + if (iot->tag == arg->tag && + iot->iova == arg->iova) { + iot->perm = IOMMU_NONE; + } +} + +/* GV: 0 AV: 1 PSCV: 1 GVMA: 0 */ static void riscv_iommu_iot_inval_pscid_iova(gpointer key, gpointer value, gpointer data) { RISCVIOMMUEntry *iot = (RISCVIOMMUEntry *) value; RISCVIOMMUEntry *arg = (RISCVIOMMUEntry *) data; - if (iot->gscid == arg->gscid && + if (iot->tag == arg->tag && iot->pscid == arg->pscid && iot->iova == arg->iova) { iot->perm = IOMMU_NONE; } } -/* GV: 1 PSCV: 1 AV: 0 */ -static void riscv_iommu_iot_inval_pscid(gpointer key, gpointer value, - gpointer data) +/* GV: 1 AV: 0 PSCV: 0 GVMA: 0 */ +/* GV: 1 AV: 0 GVMA: 1 */ +static +void riscv_iommu_iot_inval_gscid(gpointer key, gpointer value, gpointer data) { RISCVIOMMUEntry *iot = (RISCVIOMMUEntry *) value; RISCVIOMMUEntry *arg = (RISCVIOMMUEntry *) data; - if (iot->gscid == arg->gscid && - iot->pscid == arg->pscid) { + if (iot->tag == arg->tag && + iot->gscid == arg->gscid) { iot->perm = IOMMU_NONE; } } -/* GV: 1 GVMA: 1 */ -static void riscv_iommu_iot_inval_gscid_gpa(gpointer key, gpointer value, - gpointer data) +/* GV: 1 AV: 0 PSCV: 1 GVMA: 0 */ +static void riscv_iommu_iot_inval_gscid_pscid(gpointer key, gpointer value, + gpointer data) { RISCVIOMMUEntry *iot = (RISCVIOMMUEntry *) value; RISCVIOMMUEntry *arg = (RISCVIOMMUEntry *) data; - if (iot->gscid == arg->gscid) { - /* simplified cache, no GPA matching */ + if (iot->tag == arg->tag && + iot->gscid == arg->gscid && + iot->pscid == arg->pscid) { iot->perm = IOMMU_NONE; } } -/* GV: 1 GVMA: 0 */ -static void riscv_iommu_iot_inval_gscid(gpointer key, gpointer value, - gpointer data) +/* GV: 1 AV: 1 PSCV: 0 GVMA: 0 */ +/* GV: 1 AV: 1 GVMA: 1 */ +static void riscv_iommu_iot_inval_gscid_iova(gpointer key, gpointer value, + gpointer data) { RISCVIOMMUEntry *iot = (RISCVIOMMUEntry *) value; RISCVIOMMUEntry *arg = (RISCVIOMMUEntry *) data; - if (iot->gscid == arg->gscid) { + if (iot->tag == arg->tag && + iot->gscid == arg->gscid && + iot->iova == arg->iova) { iot->perm = IOMMU_NONE; } } -/* GV: 0 */ -static void riscv_iommu_iot_inval_all(gpointer key, gpointer value, - gpointer data) +/* GV: 1 AV: 1 PSCV: 1 GVMA: 0 */ +static void riscv_iommu_iot_inval_gscid_pscid_iova(gpointer key, gpointer value, + gpointer data) { RISCVIOMMUEntry *iot = (RISCVIOMMUEntry *) value; - iot->perm = IOMMU_NONE; + RISCVIOMMUEntry *arg = (RISCVIOMMUEntry *) data; + if (iot->tag == arg->tag && + iot->gscid == arg->gscid && + iot->pscid == arg->pscid && + iot->iova == arg->iova) { + iot->perm = IOMMU_NONE; + } } /* caller should keep ref-count for iot_cache object */ static RISCVIOMMUEntry *riscv_iommu_iot_lookup(RISCVIOMMUContext *ctx, - GHashTable *iot_cache, hwaddr iova) + GHashTable *iot_cache, hwaddr iova, RISCVIOMMUTransTag transtag) { RISCVIOMMUEntry key = { + .tag = transtag, .gscid = get_field(ctx->gatp, RISCV_IOMMU_DC_IOHGATP_GSCID), .pscid = get_field(ctx->ta, RISCV_IOMMU_DC_TA_PSCID), .iova = PPN_DOWN(iova), @@ -1322,10 +1378,11 @@ static void riscv_iommu_iot_update(RISCVIOMMUState *s, } static void riscv_iommu_iot_inval(RISCVIOMMUState *s, GHFunc func, - uint32_t gscid, uint32_t pscid, hwaddr iova) + uint32_t gscid, uint32_t pscid, hwaddr iova, RISCVIOMMUTransTag transtag) { GHashTable *iot_cache; RISCVIOMMUEntry key = { + .tag = transtag, .gscid = gscid, .pscid = pscid, .iova = PPN_DOWN(iova), @@ -1336,9 +1393,24 @@ static void riscv_iommu_iot_inval(RISCVIOMMUState *s, GHFunc func, g_hash_table_unref(iot_cache); } +static RISCVIOMMUTransTag riscv_iommu_get_transtag(RISCVIOMMUContext *ctx) +{ + uint64_t satp = get_field(ctx->satp, RISCV_IOMMU_ATP_MODE_FIELD); + uint64_t gatp = get_field(ctx->gatp, RISCV_IOMMU_ATP_MODE_FIELD); + + if (satp == RISCV_IOMMU_DC_FSC_MODE_BARE) { + return (gatp == RISCV_IOMMU_DC_IOHGATP_MODE_BARE) ? + RISCV_IOMMU_TRANS_TAG_BY : RISCV_IOMMU_TRANS_TAG_VG; + } else { + return (gatp == RISCV_IOMMU_DC_IOHGATP_MODE_BARE) ? + RISCV_IOMMU_TRANS_TAG_SS : RISCV_IOMMU_TRANS_TAG_VN; + } +} + static int riscv_iommu_translate(RISCVIOMMUState *s, RISCVIOMMUContext *ctx, IOMMUTLBEntry *iotlb, bool enable_cache) { + RISCVIOMMUTransTag transtag = riscv_iommu_get_transtag(ctx); RISCVIOMMUEntry *iot; IOMMUAccessFlags perm; bool enable_pid; @@ -1364,7 +1436,7 @@ static int riscv_iommu_translate(RISCVIOMMUState *s, RISCVIOMMUContext *ctx, } } - iot = riscv_iommu_iot_lookup(ctx, iot_cache, iotlb->iova); + iot = riscv_iommu_iot_lookup(ctx, iot_cache, iotlb->iova, transtag); perm = iot ? iot->perm : IOMMU_NONE; if (perm != IOMMU_NONE) { iotlb->translated_addr = PPN_PHYS(iot->phys); @@ -1395,6 +1467,7 @@ static int riscv_iommu_translate(RISCVIOMMUState *s, RISCVIOMMUContext *ctx, iot->gscid = get_field(ctx->gatp, RISCV_IOMMU_DC_IOHGATP_GSCID); iot->pscid = get_field(ctx->ta, RISCV_IOMMU_DC_TA_PSCID); iot->perm = iotlb->perm; + iot->tag = transtag; riscv_iommu_iot_update(s, iot_cache, iot); } @@ -1602,44 +1675,72 @@ static void riscv_iommu_process_cq_tail(RISCVIOMMUState *s) case RISCV_IOMMU_CMD(RISCV_IOMMU_CMD_IOTINVAL_FUNC_GVMA, RISCV_IOMMU_CMD_IOTINVAL_OPCODE): - if (cmd.dword0 & RISCV_IOMMU_CMD_IOTINVAL_PSCV) { + { + bool gv = !!(cmd.dword0 & RISCV_IOMMU_CMD_IOTINVAL_GV); + bool av = !!(cmd.dword0 & RISCV_IOMMU_CMD_IOTINVAL_AV); + bool pscv = !!(cmd.dword0 & RISCV_IOMMU_CMD_IOTINVAL_PSCV); + uint32_t gscid = get_field(cmd.dword0, + RISCV_IOMMU_CMD_IOTINVAL_GSCID); + uint32_t pscid = get_field(cmd.dword0, + RISCV_IOMMU_CMD_IOTINVAL_PSCID); + hwaddr iova = (cmd.dword1 << 2) & TARGET_PAGE_MASK; + + if (pscv) { /* illegal command arguments IOTINVAL.GVMA & PSCV == 1 */ goto cmd_ill; - } else if (!(cmd.dword0 & RISCV_IOMMU_CMD_IOTINVAL_GV)) { - /* invalidate all cache mappings */ - func = riscv_iommu_iot_inval_all; - } else if (!(cmd.dword0 & RISCV_IOMMU_CMD_IOTINVAL_AV)) { - /* invalidate cache matching GSCID */ - func = riscv_iommu_iot_inval_gscid; - } else { - /* invalidate cache matching GSCID and ADDR (GPA) */ - func = riscv_iommu_iot_inval_gscid_gpa; } - riscv_iommu_iot_inval(s, func, - get_field(cmd.dword0, RISCV_IOMMU_CMD_IOTINVAL_GSCID), 0, - cmd.dword1 << 2 & TARGET_PAGE_MASK); + + func = riscv_iommu_iot_inval_all; + + if (gv) { + func = (av) ? riscv_iommu_iot_inval_gscid_iova : + riscv_iommu_iot_inval_gscid; + } + + riscv_iommu_iot_inval( + s, func, gscid, pscid, iova, RISCV_IOMMU_TRANS_TAG_VG); + + riscv_iommu_iot_inval( + s, func, gscid, pscid, iova, RISCV_IOMMU_TRANS_TAG_VN); break; + } case RISCV_IOMMU_CMD(RISCV_IOMMU_CMD_IOTINVAL_FUNC_VMA, RISCV_IOMMU_CMD_IOTINVAL_OPCODE): - if (!(cmd.dword0 & RISCV_IOMMU_CMD_IOTINVAL_GV)) { - /* invalidate all cache mappings, simplified model */ - func = riscv_iommu_iot_inval_all; - } else if (!(cmd.dword0 & RISCV_IOMMU_CMD_IOTINVAL_PSCV)) { - /* invalidate cache matching GSCID, simplified model */ - func = riscv_iommu_iot_inval_gscid; - } else if (!(cmd.dword0 & RISCV_IOMMU_CMD_IOTINVAL_AV)) { - /* invalidate cache matching GSCID and PSCID */ - func = riscv_iommu_iot_inval_pscid; + { + bool gv = !!(cmd.dword0 & RISCV_IOMMU_CMD_IOTINVAL_GV); + bool av = !!(cmd.dword0 & RISCV_IOMMU_CMD_IOTINVAL_AV); + bool pscv = !!(cmd.dword0 & RISCV_IOMMU_CMD_IOTINVAL_PSCV); + uint32_t gscid = get_field(cmd.dword0, + RISCV_IOMMU_CMD_IOTINVAL_GSCID); + uint32_t pscid = get_field(cmd.dword0, + RISCV_IOMMU_CMD_IOTINVAL_PSCID); + hwaddr iova = (cmd.dword1 << 2) & TARGET_PAGE_MASK; + RISCVIOMMUTransTag transtag; + + if (gv) { + transtag = RISCV_IOMMU_TRANS_TAG_VN; + if (pscv) { + func = (av) ? riscv_iommu_iot_inval_gscid_pscid_iova : + riscv_iommu_iot_inval_gscid_pscid; + } else { + func = (av) ? riscv_iommu_iot_inval_gscid_iova : + riscv_iommu_iot_inval_gscid; + } } else { - /* invalidate cache matching GSCID and PSCID and ADDR (IOVA) */ - func = riscv_iommu_iot_inval_pscid_iova; + transtag = RISCV_IOMMU_TRANS_TAG_SS; + if (pscv) { + func = (av) ? riscv_iommu_iot_inval_pscid_iova : + riscv_iommu_iot_inval_pscid; + } else { + func = (av) ? riscv_iommu_iot_inval_iova : + riscv_iommu_iot_inval_all; + } } - riscv_iommu_iot_inval(s, func, - get_field(cmd.dword0, RISCV_IOMMU_CMD_IOTINVAL_GSCID), - get_field(cmd.dword0, RISCV_IOMMU_CMD_IOTINVAL_PSCID), - cmd.dword1 << 2 & TARGET_PAGE_MASK); + + riscv_iommu_iot_inval(s, func, gscid, pscid, iova, transtag); break; + } case RISCV_IOMMU_CMD(RISCV_IOMMU_CMD_IODIR_FUNC_INVAL_DDT, RISCV_IOMMU_CMD_IODIR_OPCODE):