X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?a=blobdiff_plain;f=palacios%2Fsrc%2Fpalacios%2Fvmm_cpuid.c;h=fc8918331ad7272ce44ed0061eebefb0b5b1567c;hb=774bac9fbb03ef8bf7c2ca2c79a8b87c9bc4c526;hp=ab3e91b2a752ca96daf99103fa74c1ea6ea818a0;hpb=1ebf37356d541b20aef0ff6d383861558875a604;p=palacios.git diff --git a/palacios/src/palacios/vmm_cpuid.c b/palacios/src/palacios/vmm_cpuid.c index ab3e91b..fc89183 100644 --- a/palacios/src/palacios/vmm_cpuid.c +++ b/palacios/src/palacios/vmm_cpuid.c @@ -34,11 +34,123 @@ struct masked_cpuid { }; +void init_custom(struct v3_vm_info *vm) +{ + /* + CPUID 0 + EAX = maxid supported (1) + EBX = first 4 bytes of string + EDX = second 4 bytes of string + ECX = third 4 bytes of string + + GenuineIntel + AuthenticAMD + VirtualV3VEE + EBX EDX ECX + */ + uint32_t ebx, ecx, edx; + + memcpy(&ebx,"Virt",4); + memcpy(&edx,"ualV",4); + memcpy(&ecx,"3VEE",4); + + + // In the Intel Space, we are a VirtualV3VEE + // and our maximum cpuid is 0x1 + v3_cpuid_add_fields(vm,0x0, // ID 0 (Vendor) + 0xffffffff, 1, // Max CPUID is one + 0xffffffff, ebx, + 0xffffffff, ecx, + 0xffffffff, edx); + + // In the AMD Space, we are a Virtual V3VEE + // and our maximum cpuid is 0x80000001 + // other than the maximum cpuid, this is identical to Intel 0x0 + // + v3_cpuid_add_fields(vm,0x80000000, // ID 8...0 (Vendor - AMD variant) + 0xffffffff, 0x80000001, // Max CPUID is one + 0xffffffff, ebx, + 0xffffffff, ecx, + 0xffffffff, edx); + + /* CPUID 1, EAX - Family, Model, Stepping + We are Family 16, Model 1, Stepping 1 (family 16 puts us in x86-64) + 31:28 = reserved + 27:20 = extended family (extfam) + 19:16 = extended model (extmod) + 15:12 = reserved + 11:8 = base family (basfam) + 7:4 = base model (basmod) + 3:0 = stepping + + family = extfam+basefam, model=extmod:basmod + but we need to "top out" basefam first (0xf) + + So we want: 0x00100f11 + + EBX is probably bogus here, since we need the apic ids + of the vcores, not the pcores + */ + + // in Intel Space, we are family 16, model 1, stepping 1 + // and our other features are passthrough + v3_cpuid_add_fields(vm,0x1, + 0xffffffff, 0x00100f11, + 0x0, 0, + 0x0, 0, + 0x0, 0); + + // In the AMD space, we are family 16, model 1, stepping 1 + // with other features passthrough + // These other fields are *different* from Intel's 0x1, however + // in particular, long mode is here, even if it's an Intel... + v3_cpuid_add_fields(vm,0x80000001, // AMD variant + 0xffffffff, 0x00100f11, + 0x0, 0, + 0x0, 0, + 0x0, 0); + +} + void v3_init_cpuid_map(struct v3_vm_info * vm) { vm->cpuid_map.map.rb_node = NULL; // Setup default cpuid entries +#ifdef V3_CONFIG_CUSTOM_CPUID + init_custom(vm); +#endif + + // Disable XSAVE (cpuid 0x01, ECX bit 26) + v3_cpuid_add_fields(vm, 0x01, 0, 0, 0, 0, (1 << 26), 0, 0, 0); + + // Disable MONITOR/MWAIT (cpuid 0x01, ECX bit 3) + v3_cpuid_add_fields(vm, 0x01, 0, 0, 0, 0, (1 << 3), 0, 0, 0); + + + // disable MTRR + v3_cpuid_add_fields(vm, 0x00000001, 0, 0, 0, 0, 0, 0, (1 << 12), 0); + // disable PAT + v3_cpuid_add_fields(vm, 0x00000001, 0, 0, 0, 0, 0, 0, (1 << 16), 0); + // disable HTT + v3_cpuid_add_fields(vm, 0x00000001, 0, 0, 0, 0, 0, 0, (1 << 28), 0); + + // disable X2APIC + v3_cpuid_add_fields(vm, 0x00000001, 0, 0, 0, 0, (1 << 21), 0, 0, 0); + + + // Demarcate machine as a VM + v3_cpuid_add_fields(vm, 0x00000001, + 0, 0, + 0, 0, + 0x80000000, 0x80000000, + 0, 0 + ); + + + // disable ARAT + v3_cpuid_add_fields(vm, 0x00000006, (1 << 2), 0, 0, 0, 0, 0, 0, 0); + } @@ -131,20 +243,27 @@ static int mask_hook(struct guest_info * core, uint32_t cpuid, v3_cpuid(cpuid, eax, ebx, ecx, edx); *eax &= ~(mask->rax_mask); - *eax |= mask->rax; + *eax |= (mask->rax & mask->rax_mask); *ebx &= ~(mask->rbx_mask); - *ebx |= mask->rbx; + *ebx |= (mask->rbx & mask->rbx_mask); *ecx &= ~(mask->rcx_mask); - *ecx |= mask->rcx; + *ecx |= (mask->rcx & mask->rcx_mask); *edx &= ~(mask->rdx_mask); - *edx |= mask->rdx; + *edx |= (mask->rdx & mask->rdx_mask); return 0; } + + +/* This function allows you to reserve a set of bits in a given cpuid value + * For each cpuid return register you specify which bits you want to reserve in the mask. + * The value of those bits is set in the reg param. + * The values of the reserved bits are returned to the guest, when it reads the cpuid + */ int v3_cpuid_add_fields(struct v3_vm_info * vm, uint32_t cpuid, uint32_t rax_mask, uint32_t rax, uint32_t rbx_mask, uint32_t rbx, @@ -152,8 +271,22 @@ int v3_cpuid_add_fields(struct v3_vm_info * vm, uint32_t cpuid, uint32_t rdx_mask, uint32_t rdx) { struct v3_cpuid_hook * hook = get_cpuid_hook(vm, cpuid); + + if ((~rax_mask & rax) || (~rbx_mask & rbx) || + (~rcx_mask & rcx) || (~rdx_mask & rdx)) { + PrintError(vm, VCORE_NONE, "Invalid cpuid reg value (mask overrun)\n"); + return -1; + } + + if (hook == NULL) { struct masked_cpuid * mask = V3_Malloc(sizeof(struct masked_cpuid)); + + if (!mask) { + PrintError(vm, VCORE_NONE, "Unable to alocate space for cpu id mask\n"); + return -1; + } + memset(mask, 0, sizeof(struct masked_cpuid)); mask->rax_mask = rax_mask; @@ -166,7 +299,8 @@ int v3_cpuid_add_fields(struct v3_vm_info * vm, uint32_t cpuid, mask->rdx = rdx; if (v3_hook_cpuid(vm, cpuid, mask_hook, mask) == -1) { - PrintError("Error hooking cpuid %d\n", cpuid); + PrintError(vm, VCORE_NONE, "Error hooking cpuid %d\n", cpuid); + V3_Free(mask); return -1; } } else { @@ -174,7 +308,7 @@ int v3_cpuid_add_fields(struct v3_vm_info * vm, uint32_t cpuid, uint32_t tmp_val = 0; if (hook->hook_fn != mask_hook) { - PrintError("trying to add fields to a fully hooked cpuid (%d)\n", cpuid); + PrintError(vm, VCORE_NONE, "trying to add fields to a fully hooked cpuid (%d)\n", cpuid); return -1; } @@ -184,13 +318,7 @@ int v3_cpuid_add_fields(struct v3_vm_info * vm, uint32_t cpuid, (mask->rbx_mask & rbx_mask) || (mask->rcx_mask & rcx_mask) || (mask->rdx_mask & rdx_mask)) { - PrintError("Trying to add fields that have already been masked\n"); - return -1; - } - - if ((~rax_mask & rax) || (~rbx_mask & rbx) || - (~rcx_mask & rcx) || (~rdx_mask & rdx)) { - PrintError("Invalid cpuid reg value (mask overrun)\n"); + PrintError(vm, VCORE_NONE, "Trying to add fields that have already been masked\n"); return -1; } @@ -224,7 +352,7 @@ int v3_unhook_cpuid(struct v3_vm_info * vm, uint32_t cpuid) { struct v3_cpuid_hook * hook = get_cpuid_hook(vm, cpuid); if (hook == NULL) { - PrintError("Could not find cpuid to unhook (0x%x)\n", cpuid); + PrintError(vm, VCORE_NONE, "Could not find cpuid to unhook (0x%x)\n", cpuid); return -1; } @@ -244,17 +372,23 @@ int v3_hook_cpuid(struct v3_vm_info * vm, uint32_t cpuid, struct v3_cpuid_hook * hook = NULL; if (hook_fn == NULL) { - PrintError("CPUID hook requested with null handler\n"); + PrintError(vm, VCORE_NONE, "CPUID hook requested with null handler\n"); return -1; } hook = (struct v3_cpuid_hook *)V3_Malloc(sizeof(struct v3_cpuid_hook)); + + if (!hook) { + PrintError(vm, VCORE_NONE, "Cannot allocate memory to hook cpu id\n"); + return -1; + } + hook->cpuid = cpuid; hook->private_data = private_data; hook->hook_fn = hook_fn; if (insert_cpuid_hook(vm, hook)) { - PrintError("Could not hook cpuid 0x%x (already hooked)\n", cpuid); + PrintError(vm, VCORE_NONE, "Could not hook cpuid 0x%x (already hooked)\n", cpuid); V3_Free(hook); return -1; } @@ -266,10 +400,10 @@ int v3_handle_cpuid(struct guest_info * info) { uint32_t cpuid = info->vm_regs.rax; struct v3_cpuid_hook * hook = get_cpuid_hook(info->vm_info, cpuid); - //PrintDebug("CPUID called for 0x%x\n", cpuid); + //PrintDebug(info->vm_info, info, "CPUID called for 0x%x\n", cpuid); if (hook == NULL) { - //PrintDebug("Calling passthrough handler\n"); + //PrintDebug(info->vm_info, info, "Calling passthrough handler\n"); // call the passthrough handler v3_cpuid(cpuid, (uint32_t *)&(info->vm_regs.rax), @@ -277,7 +411,7 @@ int v3_handle_cpuid(struct guest_info * info) { (uint32_t *)&(info->vm_regs.rcx), (uint32_t *)&(info->vm_regs.rdx)); } else { - // PrintDebug("Calling hook function\n"); + // PrintDebug(info->vm_info, info, "Calling hook function\n"); if (hook->hook_fn(info, cpuid, (uint32_t *)&(info->vm_regs.rax), @@ -285,12 +419,12 @@ int v3_handle_cpuid(struct guest_info * info) { (uint32_t *)&(info->vm_regs.rcx), (uint32_t *)&(info->vm_regs.rdx), hook->private_data) == -1) { - PrintError("Error in cpuid handler for 0x%x\n", cpuid); + PrintError(info->vm_info, info, "Error in cpuid handler for 0x%x\n", cpuid); return -1; } } - // PrintDebug("Cleaning up register contents\n"); + // PrintDebug(info->vm_info, info, "Cleaning up register contents\n"); info->vm_regs.rax &= 0x00000000ffffffffLL; info->vm_regs.rbx &= 0x00000000ffffffffLL;