X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?a=blobdiff_plain;f=palacios%2Fsrc%2Fpalacios%2Fvmm_sym_iface.c;h=9b3a09028a193140b0639d3f316a8bc6d69e97d9;hb=f1e6da297651aadbc037f1635a82f41285a0a424;hp=0c6414d1c6fb28f3892b719fc46121466f58964b;hpb=e63be432894673d56526c4f1c2cb4fa64daf01d9;p=palacios.git diff --git a/palacios/src/palacios/vmm_sym_iface.c b/palacios/src/palacios/vmm_sym_iface.c index 0c6414d..9b3a090 100644 --- a/palacios/src/palacios/vmm_sym_iface.c +++ b/palacios/src/palacios/vmm_sym_iface.c @@ -21,89 +21,415 @@ #include #include #include +#include +#include +#include -#define SYM_MSR_NUM 0x535 +#define SYMSPY_GLOBAL_MSR 0x534 +#define SYMSPY_LOCAL_MSR 0x535 +#define SYM_CPUID_NUM 0x90000000 +// A succesfull symcall returns via the RET_HCALL, with the return values in registers +// A symcall error returns via the ERR_HCALL with the error code in rbx -static int msr_read(uint_t msr, struct v3_msr * dst, void * priv_data) { - struct guest_info * info = (struct guest_info *)priv_data; - struct v3_sym_state * state = &(info->sym_state); - dst->value = state->guest_pg_addr; +/* Notes: We use a combination of SYSCALL and SYSENTER Semantics + * SYSCALL just sets an EIP, CS/SS seg, and GS seg via swapgs + * the RSP is loaded via the structure pointed to by GS + * This is safe because it assumes that system calls are guaranteed to be made with an empty kernel stack. + * We cannot make that assumption with a symcall, so we have to have our own stack area somewhere. + * SYSTENTER does not really use the GS base MSRs, but we do to map to 64 bit kernels + */ + +#define SYMCALL_RIP_MSR 0x536 +#define SYMCALL_RSP_MSR 0x537 +#define SYMCALL_CS_MSR 0x538 +#define SYMCALL_GS_MSR 0x539 +#define SYMCALL_FS_MSR 0x540 + +static int symspy_msr_read(struct guest_info * core, uint_t msr, + struct v3_msr * dst, void * priv_data) { + struct v3_sym_global_state * global_state = &(core->vm_info->sym_global_state); + struct v3_sym_local_state * local_state = &(core->sym_local_state); + + switch (msr) { + case SYMSPY_GLOBAL_MSR: + dst->value = global_state->global_guest_pa; + break; + case SYMSPY_LOCAL_MSR: + dst->value = local_state->local_guest_pa; + break; + default: + return -1; + } return 0; } -static int msr_write(uint_t msr, struct v3_msr src, void * priv_data) { - struct guest_info * info = (struct guest_info *)priv_data; - struct v3_sym_state * state = &(info->sym_state); - - if (state->active == 1) { - // unmap page - struct v3_shadow_region * old_reg = v3_get_shadow_region(info, (addr_t)state->guest_pg_addr); +static int symcall_msr_read(struct guest_info * core, uint_t msr, + struct v3_msr * dst, void * priv_data) { + struct v3_symcall_state * state = &(core->sym_local_state.symcall_state); - if (old_reg == NULL) { - PrintError("Could not find previously active symbiotic page (%p)\n", (void *)state->guest_pg_addr); + switch (msr) { + case SYMCALL_RIP_MSR: + dst->value = state->sym_call_rip; + break; + case SYMCALL_RSP_MSR: + dst->value = state->sym_call_rsp; + break; + case SYMCALL_CS_MSR: + dst->value = state->sym_call_cs; + break; + case SYMCALL_GS_MSR: + dst->value = state->sym_call_gs; + break; + case SYMCALL_FS_MSR: + dst->value = state->sym_call_fs; + break; + default: return -1; + } + + return 0; +} + +static int symspy_msr_write(struct guest_info * core, uint_t msr, struct v3_msr src, void * priv_data) { + + if (msr == SYMSPY_GLOBAL_MSR) { + struct v3_sym_global_state * global_state = &(core->vm_info->sym_global_state); + + PrintDebug("Symbiotic Glbal MSR write for page %p\n", (void *)(addr_t)src.value); + + if (global_state->active == 1) { + // unmap page + struct v3_shadow_region * old_reg = v3_get_shadow_region(core->vm_info, core->cpu_id, + (addr_t)global_state->global_guest_pa); + + if (old_reg == NULL) { + PrintError("Could not find previously active symbiotic page (%p)\n", + (void *)(addr_t)global_state->global_guest_pa); + return -1; + } + + v3_delete_shadow_region(core->vm_info, old_reg); } - v3_delete_shadow_region(info, old_reg); + global_state->global_guest_pa = src.value; + global_state->global_guest_pa &= ~0xfffLL; + + global_state->active = 1; + + // map page + v3_add_shadow_mem(core->vm_info, V3_MEM_CORE_ANY, (addr_t)global_state->global_guest_pa, + (addr_t)(global_state->global_guest_pa + PAGE_SIZE_4KB - 1), + global_state->global_page_pa); + } else if (msr == SYMSPY_LOCAL_MSR) { + struct v3_sym_local_state * local_state = &(core->sym_local_state); + + PrintDebug("Symbiotic Local MSR write for page %p\n", (void *)(addr_t)src.value); + + if (local_state->active == 1) { + // unmap page + struct v3_shadow_region * old_reg = v3_get_shadow_region(core->vm_info, core->cpu_id, + (addr_t)local_state->local_guest_pa); + + if (old_reg == NULL) { + PrintError("Could not find previously active symbiotic page (%p)\n", + (void *)(addr_t)local_state->local_guest_pa); + return -1; + } + + v3_delete_shadow_region(core->vm_info, old_reg); + } + + local_state->local_guest_pa = src.value; + local_state->local_guest_pa &= ~0xfffLL; + + local_state->active = 1; + + // map page + v3_add_shadow_mem(core->vm_info, core->cpu_id, (addr_t)local_state->local_guest_pa, + (addr_t)(local_state->local_guest_pa + PAGE_SIZE_4KB - 1), + local_state->local_page_pa); + } else { + PrintError("Invalid Symbiotic MSR write (0x%x)\n", msr); + return -1; } - state->guest_pg_addr = src.value; - state->guest_pg_addr &= ~0xfffLL; + return 0; +} - state->active = 1; - // map page - v3_add_shadow_mem(info, (addr_t)state->guest_pg_addr, - (addr_t)(state->guest_pg_addr + PAGE_SIZE_4KB - 1), - state->sym_page_pa); +static int symcall_msr_write(struct guest_info * core, uint_t msr, struct v3_msr src, void * priv_data) { + struct v3_symcall_state * state = &(core->sym_local_state.symcall_state); + switch (msr) { + case SYMCALL_RIP_MSR: + state->sym_call_rip = src.value; + break; + case SYMCALL_RSP_MSR: + state->sym_call_rsp = src.value; + break; + case SYMCALL_CS_MSR: + state->sym_call_cs = src.value; + break; + case SYMCALL_GS_MSR: + state->sym_call_gs = src.value; + break; + case SYMCALL_FS_MSR: + state->sym_call_fs = src.value; + break; + default: + PrintError("Invalid Symbiotic MSR write (0x%x)\n", msr); + return -1; + } return 0; } +static int cpuid_fn(struct guest_info * core, uint32_t cpuid, + uint32_t * eax, uint32_t * ebx, + uint32_t * ecx, uint32_t * edx, + void * private_data) { + extern v3_cpu_arch_t v3_cpu_types[]; + + *eax = *(uint32_t *)"V3V"; + + if ((v3_cpu_types[core->cpu_id] == V3_SVM_CPU) || + (v3_cpu_types[core->cpu_id] == V3_SVM_REV3_CPU)) { + *ebx = *(uint32_t *)"SVM"; + } else if ((v3_cpu_types[core->cpu_id] == V3_VMX_CPU) || + (v3_cpu_types[core->cpu_id] == V3_VMX_EPT_CPU)) { + *ebx = *(uint32_t *)"VMX"; + } + + + return 0; +} + + +static int sym_call_ret(struct guest_info * info, uint_t hcall_id, void * private_data); +static int sym_call_err(struct guest_info * info, uint_t hcall_id, void * private_data); -int v3_init_sym_iface(struct guest_info * info) { - struct v3_sym_state * state = &(info->sym_state); - - memset(state, 0, sizeof(struct v3_sym_state)); - PrintDebug("Allocating symbiotic page\n"); - state->sym_page_pa = (addr_t)V3_AllocPages(1); - state->sym_page = (struct v3_sym_interface *)V3_VAddr((void *)state->sym_page_pa); +int v3_init_sym_iface(struct v3_vm_info * vm) { + struct v3_sym_global_state * global_state = &(vm->sym_global_state); + memset(global_state, 0, sizeof(struct v3_sym_global_state)); - PrintDebug("Clearing symbiotic page\n"); - memset(state->sym_page, 0, PAGE_SIZE_4KB); + global_state->global_page_pa = (addr_t)V3_AllocPages(1); + global_state->sym_page = (struct v3_sym_global_page *)V3_VAddr((void *)global_state->global_page_pa); + memset(global_state->sym_page, 0, PAGE_SIZE_4KB); - PrintDebug("hooking MSR\n"); - v3_hook_msr(info, SYM_MSR_NUM, msr_read, msr_write, info); + memcpy(&(global_state->sym_page->magic), "V3V", 3); + + v3_hook_msr(vm, SYMSPY_LOCAL_MSR, symspy_msr_read, symspy_msr_write, NULL); + v3_hook_msr(vm, SYMSPY_GLOBAL_MSR, symspy_msr_read, symspy_msr_write, NULL); + + v3_hook_cpuid(vm, SYM_CPUID_NUM, cpuid_fn, NULL); + + v3_hook_msr(vm, SYMCALL_RIP_MSR, symcall_msr_read, symcall_msr_write, NULL); + v3_hook_msr(vm, SYMCALL_RSP_MSR, symcall_msr_read, symcall_msr_write, NULL); + v3_hook_msr(vm, SYMCALL_CS_MSR, symcall_msr_read, symcall_msr_write, NULL); + v3_hook_msr(vm, SYMCALL_GS_MSR, symcall_msr_read, symcall_msr_write, NULL); + v3_hook_msr(vm, SYMCALL_FS_MSR, symcall_msr_read, symcall_msr_write, NULL); + + v3_register_hypercall(vm, SYMCALL_RET_HCALL, sym_call_ret, NULL); + v3_register_hypercall(vm, SYMCALL_ERR_HCALL, sym_call_err, NULL); - PrintDebug("Done\n"); return 0; } -int v3_sym_map_pci_passthrough(struct guest_info * info, uint_t bus, uint_t dev, uint_t fn) { - struct v3_sym_state * state = &(info->sym_state); - uint_t dev_index = (bus << 16) + (dev << 8) + fn; + +int v3_init_sym_core(struct guest_info * core) { + struct v3_sym_local_state * local_state = &(core->sym_local_state); + memset(local_state, 0, sizeof(struct v3_sym_local_state)); + + local_state->local_page_pa = (addr_t)V3_AllocPages(1); + local_state->local_page = (struct v3_sym_local_page *)V3_VAddr((void *)local_state->local_page_pa); + memset(local_state->local_page, 0, PAGE_SIZE_4KB); + + snprintf((uint8_t *)&(local_state->local_page->magic), 8, "V3V.%d", core->cpu_id); + + return 0; +} + + +int v3_sym_map_pci_passthrough(struct v3_vm_info * vm, uint_t bus, uint_t dev, uint_t fn) { + struct v3_sym_global_state * global_state = &(vm->sym_global_state); + uint_t dev_index = (bus << 8) + (dev << 3) + fn; uint_t major = dev_index / 8; uint_t minor = dev_index % 8; - state->sym_page->pci_pt_map[major] |= 0x1 << minor; + if (bus > 3) { + PrintError("Invalid PCI bus %d\n", bus); + return -1; + } + + PrintDebug("Setting passthrough pci map for index=%d\n", dev_index); + + global_state->sym_page->pci_pt_map[major] |= 0x1 << minor; + + PrintDebug("pt_map entry=%x\n", global_state->sym_page->pci_pt_map[major]); + + PrintDebug("pt map vmm addr=%p\n", global_state->sym_page->pci_pt_map); return 0; } -int v3_sym_unmap_pci_passthrough(struct guest_info * info, uint_t bus, uint_t dev, uint_t fn) { - struct v3_sym_state * state = &(info->sym_state); - uint_t dev_index = (bus << 16) + (dev << 8) + fn; +int v3_sym_unmap_pci_passthrough(struct v3_vm_info * vm, uint_t bus, uint_t dev, uint_t fn) { + struct v3_sym_global_state * global_state = &(vm->sym_global_state); + uint_t dev_index = (bus << 8) + (dev << 3) + fn; uint_t major = dev_index / 8; uint_t minor = dev_index % 8; - state->sym_page->pci_pt_map[major] &= ~(0x1 << minor); + if (bus > 3) { + PrintError("Invalid PCI bus %d\n", bus); + return -1; + } + + global_state->sym_page->pci_pt_map[major] &= ~(0x1 << minor); + + return 0; +} + + +static int sym_call_err(struct guest_info * core, uint_t hcall_id, void * private_data) { + struct v3_symcall_state * state = (struct v3_symcall_state *)&(core->sym_local_state.symcall_state); + + PrintError("sym call error\n"); + + state->sym_call_errno = (int)core->vm_regs.rbx; + v3_print_guest_state(core); + v3_print_mem_map(core->vm_info); + + // clear sym flags + state->sym_call_error = 1; + state->sym_call_returned = 1; + + return -1; +} + +static int sym_call_ret(struct guest_info * core, uint_t hcall_id, void * private_data) { + struct v3_symcall_state * state = (struct v3_symcall_state *)&(core->sym_local_state.symcall_state); + + // PrintError("Return from sym call (ID=%x)\n", hcall_id); + // v3_print_guest_state(info); + + state->sym_call_returned = 1; + + return 0; +} + +static int execute_symcall(struct guest_info * core) { + struct v3_symcall_state * state = (struct v3_symcall_state *)&(core->sym_local_state.symcall_state); + + while (state->sym_call_returned == 0) { + if (v3_vm_enter(core) == -1) { + PrintError("Error in Sym call\n"); + return -1; + } + } return 0; } + + +int v3_sym_call(struct guest_info * core, + uint64_t call_num, sym_arg_t * arg0, + sym_arg_t * arg1, sym_arg_t * arg2, + sym_arg_t * arg3, sym_arg_t * arg4) { + struct v3_sym_local_state * sym_state = (struct v3_sym_local_state *)&(core->sym_local_state); + struct v3_symcall_state * state = (struct v3_symcall_state *)&(sym_state->symcall_state); + struct v3_sym_cpu_context * old_ctx = (struct v3_sym_cpu_context *)&(state->old_ctx); + struct v3_segment sym_cs; + struct v3_segment sym_ss; + uint64_t trash_args[5] = { [0 ... 4] = 0 }; + + // PrintDebug("Making Sym call\n"); + // v3_print_guest_state(info); + + if ((sym_state->local_page->sym_call_enabled == 0) || + (state->sym_call_active == 1)) { + return -1; + } + + if (!arg0) arg0 = &trash_args[0]; + if (!arg1) arg1 = &trash_args[1]; + if (!arg2) arg2 = &trash_args[2]; + if (!arg3) arg3 = &trash_args[3]; + if (!arg4) arg4 = &trash_args[4]; + + // Save the old context + memcpy(&(old_ctx->vm_regs), &(core->vm_regs), sizeof(struct v3_gprs)); + memcpy(&(old_ctx->cs), &(core->segments.cs), sizeof(struct v3_segment)); + memcpy(&(old_ctx->ss), &(core->segments.ss), sizeof(struct v3_segment)); + old_ctx->gs_base = core->segments.gs.base; + old_ctx->fs_base = core->segments.fs.base; + old_ctx->rip = core->rip; + old_ctx->cpl = core->cpl; + old_ctx->flags = core->ctrl_regs.rflags; + + // Setup the sym call context + core->rip = state->sym_call_rip; + core->vm_regs.rsp = state->sym_call_rsp; // old contest rsp is saved in vm_regs + + v3_translate_segment(core, state->sym_call_cs, &sym_cs); + memcpy(&(core->segments.cs), &sym_cs, sizeof(struct v3_segment)); + + v3_translate_segment(core, state->sym_call_cs + 8, &sym_ss); + memcpy(&(core->segments.ss), &sym_ss, sizeof(struct v3_segment)); + + core->segments.gs.base = state->sym_call_gs; + core->segments.fs.base = state->sym_call_fs; + core->cpl = 0; + + core->vm_regs.rax = call_num; + core->vm_regs.rbx = *arg0; + core->vm_regs.rcx = *arg1; + core->vm_regs.rdx = *arg2; + core->vm_regs.rsi = *arg3; + core->vm_regs.rdi = *arg4; + + // Mark sym call as active + state->sym_call_active = 1; + state->sym_call_returned = 0; + + // PrintDebug("Sym state\n"); + // v3_print_guest_state(core); + + // Do the sym call entry + if (execute_symcall(core) == -1) { + PrintError("SYMCALL error\n"); + return -1; + } + + // clear sym flags + state->sym_call_active = 0; + + *arg0 = core->vm_regs.rbx; + *arg1 = core->vm_regs.rcx; + *arg2 = core->vm_regs.rdx; + *arg3 = core->vm_regs.rsi; + *arg4 = core->vm_regs.rdi; + + // restore guest state + memcpy(&(core->vm_regs), &(old_ctx->vm_regs), sizeof(struct v3_gprs)); + memcpy(&(core->segments.cs), &(old_ctx->cs), sizeof(struct v3_segment)); + memcpy(&(core->segments.ss), &(old_ctx->ss), sizeof(struct v3_segment)); + core->segments.gs.base = old_ctx->gs_base; + core->segments.fs.base = old_ctx->fs_base; + core->rip = old_ctx->rip; + core->cpl = old_ctx->cpl; + core->ctrl_regs.rflags = old_ctx->flags; + + + + // PrintError("restoring guest state\n"); + // v3_print_guest_state(core); + + return 0; +} + +