X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?a=blobdiff_plain;f=palacios%2Fsrc%2Fpalacios%2Fsvm.c;h=84e720004c37de779df71f071724fe3f67e2f97e;hb=2d3172e90b9f059548bf5dfcf4f85ed71672aac7;hp=a2cbbc1b547d49534e5c5286092f6b97478e3607;hpb=840d15c3a300636e758fcfcf403ae415ffa67816;p=palacios.git diff --git a/palacios/src/palacios/svm.c b/palacios/src/palacios/svm.c index a2cbbc1..84e7200 100644 --- a/palacios/src/palacios/svm.c +++ b/palacios/src/palacios/svm.c @@ -1,4 +1,3 @@ - /* * This file is part of the Palacios Virtual Machine Monitor developed * by the V3VEE Project with funding from the United States National @@ -36,6 +35,11 @@ #include #include +#include + +#ifdef V3_CONFIG_CHECKPOINT +#include +#endif #include @@ -81,6 +85,25 @@ static vmcb_t * Allocate_VMCB() { } +static int v3_svm_handle_efer_write(struct guest_info * core, uint_t msr, struct v3_msr src, void * priv_data) +{ + int status; + + // Call arch-independent handler + if ((status = v3_handle_efer_write(core, msr, src, priv_data)) != 0) { + return status; + } + + // SVM-specific code + { + // Ensure that hardware visible EFER.SVME bit is set (SVM Enable) + struct efer_64 * hw_efer = (struct efer_64 *)&(core->ctrl_regs.efer); + hw_efer->svme = 1; + } + + return 0; +} + static void Init_VMCB_BIOS(vmcb_t * vmcb, struct guest_info * core) { vmcb_ctrl_t * ctrl_area = GET_VMCB_CTRL_AREA(vmcb); @@ -106,10 +129,9 @@ static void Init_VMCB_BIOS(vmcb_t * vmcb, struct guest_info * core) { ctrl_area->instrs.HLT = 1; -#ifdef V3_CONFIG_TIME_VIRTUALIZE_TSC - ctrl_area->instrs.RDTSC = 1; - ctrl_area->svm_instrs.RDTSCP = 1; -#endif + /* Set at VMM launch as needed */ + ctrl_area->instrs.RDTSC = 0; + ctrl_area->svm_instrs.RDTSCP = 0; // guest_state->cr0 = 0x00000001; // PE @@ -136,11 +158,6 @@ static void Init_VMCB_BIOS(vmcb_t * vmcb, struct guest_info * core) { ctrl_area->instrs.PAUSE = 1; ctrl_area->instrs.shutdown_evts = 1; - /* KCH: intercept SW Interrupts (INT instr) */ -#ifdef V3_CONFIG_SW_INTERRUPTS - ctrl_area->instrs.INTn = 1; -#endif - /* DEBUG FOR RETURN CODE */ ctrl_area->exit_code = 1; @@ -226,40 +243,9 @@ static void Init_VMCB_BIOS(vmcb_t * vmcb, struct guest_info * core) { v3_hook_msr(core->vm_info, EFER_MSR, &v3_handle_efer_read, - &v3_handle_efer_write, + &v3_svm_handle_efer_write, core); -#ifdef V3_CONFIG_HIJACK_SYSCALL_MSR - /* KCH: we're not hooking these to TRAP them, - instead, we're going to catch the target EIP. - Hopefully this EIP is the entry point in the ELF located in the - vsyscall page. We can inject checks into the code segment such that - we don't have to exit on uninteresting system calls. This should - give us much better performance than INT 80, and should even obviate - the need to deal with software interrupts at all */ - v3_hook_msr(core->vm_info, STAR_MSR, - &v3_handle_star_read, - &v3_handle_star_write, - core); - v3_hook_msr(core->vm_info, LSTAR_MSR, - &v3_handle_lstar_read, - &v3_handle_lstar_write, - core); - v3_hook_msr(core->vm_info, CSTAR_MSR, - &v3_handle_cstar_read, - &v3_handle_cstar_write, - core); - - /* KCH: this probably isn't necessary, as - SYSENTER is only used in legacy mode. In fact, - in long mode it results in an illegal instruction - exception */ - v3_hook_msr(core->vm_info, IA32_SYSENTER_EIP_MSR, - &v3_handle_seeip_read, - &v3_handle_seeip_write, - core); -#endif - if (core->shdw_pg_mode == SHADOW_PAGING) { PrintDebug("Creating initial shadow page table\n"); @@ -324,6 +310,28 @@ static void Init_VMCB_BIOS(vmcb_t * vmcb, struct guest_info * core) { &v3_handle_vm_cr_read, &v3_handle_vm_cr_write, core); + + + { +#define INT_PENDING_AMD_MSR 0xc0010055 + + v3_hook_msr(core->vm_info, IA32_STAR_MSR, NULL, NULL, NULL); + v3_hook_msr(core->vm_info, IA32_LSTAR_MSR, NULL, NULL, NULL); + v3_hook_msr(core->vm_info, IA32_FMASK_MSR, NULL, NULL, NULL); + v3_hook_msr(core->vm_info, IA32_KERN_GS_BASE_MSR, NULL, NULL, NULL); + v3_hook_msr(core->vm_info, IA32_CSTAR_MSR, NULL, NULL, NULL); + + v3_hook_msr(core->vm_info, SYSENTER_CS_MSR, NULL, NULL, NULL); + v3_hook_msr(core->vm_info, SYSENTER_ESP_MSR, NULL, NULL, NULL); + v3_hook_msr(core->vm_info, SYSENTER_EIP_MSR, NULL, NULL, NULL); + + + v3_hook_msr(core->vm_info, FS_BASE_MSR, NULL, NULL, NULL); + v3_hook_msr(core->vm_info, GS_BASE_MSR, NULL, NULL, NULL); + + // Passthrough read operations are ok. + v3_hook_msr(core->vm_info, INT_PENDING_AMD_MSR, NULL, v3_msr_unhandled_write, NULL); + } } @@ -355,6 +363,27 @@ int v3_deinit_svm_vmcb(struct guest_info * core) { } +#ifdef V3_CONFIG_CHECKPOINT +int v3_svm_save_core(struct guest_info * core, void * ctx){ + + v3_chkpt_save_8(ctx, "cpl", &(core->cpl)); + v3_chkpt_save(ctx, "vmcb_data", PAGE_SIZE, core->vmm_data); + + return 0; +} + +int v3_svm_load_core(struct guest_info * core, void * ctx){ + + v3_chkpt_load_8(ctx, "cpl", &(core->cpl)); + + if (v3_chkpt_load(ctx, "vmcb_data", PAGE_SIZE, core->vmm_data) == -1) { + return -1; + } + + return 0; +} +#endif + static int update_irq_exit_state(struct guest_info * info) { vmcb_ctrl_t * guest_ctrl = GET_VMCB_CTRL_AREA((vmcb_t*)(info->vmm_data)); @@ -459,23 +488,21 @@ static int update_irq_entry_state(struct guest_info * info) { case V3_NMI: guest_ctrl->EVENTINJ.type = SVM_INJECTION_NMI; break; - case V3_SOFTWARE_INTR: { -#ifdef CONFIG_DEBUG_INTERRUPTS - PrintDebug("Caught an injected software interrupt\n"); - PrintDebug("\ttype: %d, vector: %d\n", SVM_INJECTION_SOFT_INTR, info->intr_core_state.swintr_vector); + case V3_SOFTWARE_INTR: + guest_ctrl->EVENTINJ.type = SVM_INJECTION_SOFT_INTR; + +#ifdef V3_CONFIG_DEBUG_INTERRUPTS + PrintDebug("Injecting software interrupt -- type: %d, vector: %d\n", + SVM_INJECTION_SOFT_INTR, info->intr_core_state.swintr_vector); #endif - guest_ctrl->EVENTINJ.type = SVM_INJECTION_SOFT_INTR; - guest_ctrl->EVENTINJ.vector = info->intr_core_state.swintr_vector; - guest_ctrl->EVENTINJ.valid = 1; + guest_ctrl->EVENTINJ.vector = info->intr_core_state.swintr_vector; + guest_ctrl->EVENTINJ.valid = 1; - /* reset the software interrupt state. - we can do this because we know only one - sw int can be posted at a time on a given - core, unlike irqs */ - info->intr_core_state.swintr_posted = 0; - info->intr_core_state.swintr_vector = 0; - break; - } + /* reset swintr state */ + info->intr_core_state.swintr_posted = 0; + info->intr_core_state.swintr_vector = 0; + + break; case V3_VIRTUAL_IRQ: guest_ctrl->EVENTINJ.type = SVM_INJECTION_IRQ; break; @@ -490,6 +517,20 @@ static int update_irq_entry_state(struct guest_info * info) { return 0; } +int +v3_svm_config_tsc_virtualization(struct guest_info * info) { + vmcb_ctrl_t * ctrl_area = GET_VMCB_CTRL_AREA((vmcb_t*)(info->vmm_data)); + + if (info->time_state.flags & VM_TIME_TRAP_RDTSC) { + ctrl_area->instrs.RDTSC = 1; + ctrl_area->svm_instrs.RDTSCP = 1; + } else { + ctrl_area->instrs.RDTSC = 0; + ctrl_area->svm_instrs.RDTSCP = 0; + ctrl_area->TSC_OFFSET = v3_tsc_host_offset(&info->time_state); + } + return 0; +} /* * CAUTION and DANGER!!! @@ -503,19 +544,20 @@ int v3_svm_enter(struct guest_info * info) { vmcb_ctrl_t * guest_ctrl = GET_VMCB_CTRL_AREA((vmcb_t*)(info->vmm_data)); vmcb_saved_state_t * guest_state = GET_VMCB_SAVE_STATE_AREA((vmcb_t*)(info->vmm_data)); addr_t exit_code = 0, exit_info1 = 0, exit_info2 = 0; + uint64_t guest_cycles = 0; // Conditionally yield the CPU if the timeslice has expired v3_yield_cond(info); - // Perform any additional yielding needed for time adjustment - v3_adjust_time(info); + // Update timer devices after being in the VM before doing + // IRQ updates, so that any interrupts they raise get seen + // immediately. + v3_advance_time(info, NULL); + v3_update_timers(info); // disable global interrupts for vm state transition v3_clgi(); - // Update timer devices prior to entering VM. - v3_update_timers(info); - // Synchronize the guest state to the VMCB guest_state->cr0 = info->ctrl_regs.cr0; guest_state->cr2 = info->ctrl_regs.cr2; @@ -560,19 +602,28 @@ int v3_svm_enter(struct guest_info * info) { } #endif - v3_time_enter_vm(info); - guest_ctrl->TSC_OFFSET = v3_tsc_host_offset(&info->time_state); + v3_svm_config_tsc_virtualization(info); //V3_Print("Calling v3_svm_launch\n"); + { + uint64_t entry_tsc = 0; + uint64_t exit_tsc = 0; + + rdtscll(entry_tsc); + + v3_svm_launch((vmcb_t *)V3_PAddr(info->vmm_data), &(info->vm_regs), (vmcb_t *)host_vmcbs[V3_Get_CPU()]); + + rdtscll(exit_tsc); + + guest_cycles = exit_tsc - entry_tsc; + } - v3_svm_launch((vmcb_t *)V3_PAddr(info->vmm_data), &(info->vm_regs), (vmcb_t *)host_vmcbs[V3_Get_CPU()]); //V3_Print("SVM Returned: Exit Code: %x, guest_rip=%lx\n", (uint32_t)(guest_ctrl->exit_code), (unsigned long)guest_state->rip); v3_last_exit = (uint32_t)(guest_ctrl->exit_code); - // Immediate exit from VM time bookkeeping - v3_time_exit_vm(info); + v3_advance_time(info, &guest_cycles); info->num_exits++; @@ -598,13 +649,11 @@ int v3_svm_enter(struct guest_info * info) { info->mem_mode = v3_get_vm_mem_mode(info); /* ** */ - // save exit info here exit_code = guest_ctrl->exit_code; exit_info1 = guest_ctrl->exit_info1; exit_info2 = guest_ctrl->exit_info2; - #ifdef V3_CONFIG_SYMCALL if (info->sym_core_state.symcall_state.sym_call_active == 0) { update_irq_exit_state(info); @@ -613,20 +662,30 @@ int v3_svm_enter(struct guest_info * info) { update_irq_exit_state(info); #endif - // reenable global interrupts after vm exit v3_stgi(); - // Conditionally yield the CPU if the timeslice has expired v3_yield_cond(info); + // This update timers is for time-dependent handlers + // if we're slaved to host time + v3_advance_time(info, NULL); + v3_update_timers(info); + { + int ret = v3_handle_svm_exit(info, exit_code, exit_info1, exit_info2); + + if (ret != 0) { + PrintError("Error in SVM exit handler (ret=%d)\n", ret); + PrintError(" last Exit was %d (exit code=0x%llx)\n", v3_last_exit, (uint64_t) exit_code); + return -1; + } + } - if (v3_handle_svm_exit(info, exit_code, exit_info1, exit_info2) != 0) { - PrintError("Error in SVM exit handler\n"); - PrintError(" last exit was %d\n", v3_last_exit); - return -1; + if (info->timeouts.timeout_active) { + /* Check to see if any timeouts have expired */ + v3_handle_timeouts(info, guest_cycles); } @@ -642,16 +701,24 @@ int v3_start_svm_guest(struct guest_info * info) { if (info->vcpu_id == 0) { info->core_run_state = CORE_RUNNING; - info->vm_info->run_state = VM_RUNNING; } else { PrintDebug("SVM core %u (on %u): Waiting for core initialization\n", info->vcpu_id, info->pcpu_id); while (info->core_run_state == CORE_STOPPED) { + + if (info->vm_info->run_state == VM_STOPPED) { + // The VM was stopped before this core was initialized. + return 0; + } + v3_yield(info); //PrintDebug("SVM core %u: still waiting for INIT\n", info->vcpu_id); } PrintDebug("SVM core %u(on %u) initialized\n", info->vcpu_id, info->pcpu_id); + + // We'll be paranoid about race conditions here + v3_wait_at_barrier(info); } PrintDebug("SVM core %u(on %u): I am starting at CS=0x%x (base=0x%p, limit=0x%x), RIP=0x%p\n", @@ -711,6 +778,8 @@ int v3_start_svm_guest(struct guest_info * info) { break; } + v3_wait_at_barrier(info); + if (info->vm_info->run_state == VM_STOPPED) { info->core_run_state = CORE_STOPPED; @@ -810,11 +879,11 @@ int v3_is_svm_capable() { static int has_svm_nested_paging() { uint32_t eax = 0, ebx = 0, ecx = 0, edx = 0; - + v3_cpuid(CPUID_SVM_REV_AND_FEATURE_IDS, &eax, &ebx, &ecx, &edx); - + //PrintDebug("CPUID_EXT_FEATURE_IDS_edx=0x%x\n", edx); - + if ((edx & CPUID_SVM_REV_AND_FEATURE_IDS_edx_np) == 0) { V3_Print("SVM Nested Paging not supported\n"); return 0; @@ -822,8 +891,8 @@ static int has_svm_nested_paging() { V3_Print("SVM Nested Paging supported\n"); return 1; } -} - + } + void v3_init_svm_cpu(int cpu_id) {