From a3412036477e8c91e0b71fcd91de4e24a9904077 Mon Sep 17 00:00:00 2001 From: Peter Maydell Date: Tue, 25 Jul 2023 10:56:51 +0100 Subject: [PATCH 09/14] hw/arm/smmu: Handle big-endian hosts correctly MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit RH-Author: Eric Auger RH-MergeRequest: 197: virtio-iommu/smmu: backport some late fixes RH-Bugzilla: 2229133 RH-Acked-by: Thomas Huth RH-Acked-by: Peter Xu RH-Commit: [3/3] df9c8d228b25273e0c4927a10b21e66fb4bef5f0 (eauger1/centos-qemu-kvm) Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2229133 The implementation of the SMMUv3 has multiple places where it reads a data structure from the guest and directly operates on it without doing a guest-to-host endianness conversion. Since all SMMU data structures are little-endian, this means that the SMMU doesn't work on a big-endian host. In particular, this causes the Avocado test machine_aarch64_virt.py:Aarch64VirtMachine.test_alpine_virt_tcg_gic_max to fail on an s390x host. Add appropriate byte-swapping on reads and writes of guest in-memory data structures so that the device works correctly on big-endian hosts. As part of this we constrain queue_read() to operate only on Cmd structs and queue_write() on Evt structs, because in practice these are the only data structures the two functions are used with, and we need to know what the data structure is to be able to byte-swap its parts correctly. Signed-off-by: Peter Maydell Tested-by: Thomas Huth Reviewed-by: Philippe Mathieu-Daudé Reviewed-by: Eric Auger Message-id: 20230717132641.764660-1-peter.maydell@linaro.org Cc: qemu-stable@nongnu.org (cherry picked from commit c6445544d4cea2628fbad3bad09f3d3a03c749d3) Signed-off-by: Eric Auger --- hw/arm/smmu-common.c | 3 +-- hw/arm/smmuv3.c | 39 +++++++++++++++++++++++++++++++-------- 2 files changed, 32 insertions(+), 10 deletions(-) diff --git a/hw/arm/smmu-common.c b/hw/arm/smmu-common.c index e7f1c1f219..daa02ce798 100644 --- a/hw/arm/smmu-common.c +++ b/hw/arm/smmu-common.c @@ -192,8 +192,7 @@ static int get_pte(dma_addr_t baseaddr, uint32_t index, uint64_t *pte, dma_addr_t addr = baseaddr + index * sizeof(*pte); /* TODO: guarantee 64-bit single-copy atomicity */ - ret = dma_memory_read(&address_space_memory, addr, pte, sizeof(*pte), - MEMTXATTRS_UNSPECIFIED); + ret = ldq_le_dma(&address_space_memory, addr, pte, MEMTXATTRS_UNSPECIFIED); if (ret != MEMTX_OK) { info->type = SMMU_PTW_ERR_WALK_EABT; diff --git a/hw/arm/smmuv3.c b/hw/arm/smmuv3.c index 270c80b665..cfb56725a6 100644 --- a/hw/arm/smmuv3.c +++ b/hw/arm/smmuv3.c @@ -98,20 +98,34 @@ static void smmuv3_write_gerrorn(SMMUv3State *s, uint32_t new_gerrorn) trace_smmuv3_write_gerrorn(toggled & pending, s->gerrorn); } -static inline MemTxResult queue_read(SMMUQueue *q, void *data) +static inline MemTxResult queue_read(SMMUQueue *q, Cmd *cmd) { dma_addr_t addr = Q_CONS_ENTRY(q); + MemTxResult ret; + int i; - return dma_memory_read(&address_space_memory, addr, data, q->entry_size, - MEMTXATTRS_UNSPECIFIED); + ret = dma_memory_read(&address_space_memory, addr, cmd, sizeof(Cmd), + MEMTXATTRS_UNSPECIFIED); + if (ret != MEMTX_OK) { + return ret; + } + for (i = 0; i < ARRAY_SIZE(cmd->word); i++) { + le32_to_cpus(&cmd->word[i]); + } + return ret; } -static MemTxResult queue_write(SMMUQueue *q, void *data) +static MemTxResult queue_write(SMMUQueue *q, Evt *evt_in) { dma_addr_t addr = Q_PROD_ENTRY(q); MemTxResult ret; + Evt evt = *evt_in; + int i; - ret = dma_memory_write(&address_space_memory, addr, data, q->entry_size, + for (i = 0; i < ARRAY_SIZE(evt.word); i++) { + cpu_to_le32s(&evt.word[i]); + } + ret = dma_memory_write(&address_space_memory, addr, &evt, sizeof(Evt), MEMTXATTRS_UNSPECIFIED); if (ret != MEMTX_OK) { return ret; @@ -291,7 +305,7 @@ static void smmuv3_init_regs(SMMUv3State *s) static int smmu_get_ste(SMMUv3State *s, dma_addr_t addr, STE *buf, SMMUEventInfo *event) { - int ret; + int ret, i; trace_smmuv3_get_ste(addr); /* TODO: guarantee 64-bit single-copy atomicity */ @@ -304,6 +318,9 @@ static int smmu_get_ste(SMMUv3State *s, dma_addr_t addr, STE *buf, event->u.f_ste_fetch.addr = addr; return -EINVAL; } + for (i = 0; i < ARRAY_SIZE(buf->word); i++) { + le32_to_cpus(&buf->word[i]); + } return 0; } @@ -313,7 +330,7 @@ static int smmu_get_cd(SMMUv3State *s, STE *ste, uint32_t ssid, CD *buf, SMMUEventInfo *event) { dma_addr_t addr = STE_CTXPTR(ste); - int ret; + int ret, i; trace_smmuv3_get_cd(addr); /* TODO: guarantee 64-bit single-copy atomicity */ @@ -326,6 +343,9 @@ static int smmu_get_cd(SMMUv3State *s, STE *ste, uint32_t ssid, event->u.f_ste_fetch.addr = addr; return -EINVAL; } + for (i = 0; i < ARRAY_SIZE(buf->word); i++) { + le32_to_cpus(&buf->word[i]); + } return 0; } @@ -407,7 +427,7 @@ static int smmu_find_ste(SMMUv3State *s, uint32_t sid, STE *ste, return -EINVAL; } if (s->features & SMMU_FEATURE_2LVL_STE) { - int l1_ste_offset, l2_ste_offset, max_l2_ste, span; + int l1_ste_offset, l2_ste_offset, max_l2_ste, span, i; dma_addr_t l1ptr, l2ptr; STEDesc l1std; @@ -431,6 +451,9 @@ static int smmu_find_ste(SMMUv3State *s, uint32_t sid, STE *ste, event->u.f_ste_fetch.addr = l1ptr; return -EINVAL; } + for (i = 0; i < ARRAY_SIZE(l1std.word); i++) { + le32_to_cpus(&l1std.word[i]); + } span = L1STD_SPAN(&l1std); -- 2.39.3