xref: /qemu/target/i386/hvf/x86_task.c (revision 27458df871097d7fc14b19d9e01c35d29737b9b3)
1996feed4SSergio Andres Gomez Del Real // This software is licensed under the terms of the GNU General Public
2996feed4SSergio Andres Gomez Del Real // License version 2, as published by the Free Software Foundation, and
3996feed4SSergio Andres Gomez Del Real // may be copied, distributed, and modified under those terms.
4996feed4SSergio Andres Gomez Del Real //
5996feed4SSergio Andres Gomez Del Real // This program is distributed in the hope that it will be useful,
6996feed4SSergio Andres Gomez Del Real // but WITHOUT ANY WARRANTY; without even the implied warranty of
7996feed4SSergio Andres Gomez Del Real // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
8996feed4SSergio Andres Gomez Del Real // GNU General Public License for more details.
9996feed4SSergio Andres Gomez Del Real #include "qemu/osdep.h"
10895f9fdfSPaolo Bonzini #include "panic.h"
11996feed4SSergio Andres Gomez Del Real #include "qemu/error-report.h"
12996feed4SSergio Andres Gomez Del Real 
1332cad1ffSPhilippe Mathieu-Daudé #include "system/hvf.h"
14996feed4SSergio Andres Gomez Del Real #include "hvf-i386.h"
1569e0a03cSPaolo Bonzini #include "vmcs.h"
1669e0a03cSPaolo Bonzini #include "vmx.h"
17*27458df8SWei Liu #include "emulate/x86.h"
1869e0a03cSPaolo Bonzini #include "x86_descr.h"
1969e0a03cSPaolo Bonzini #include "x86_mmu.h"
20*27458df8SWei Liu #include "emulate/x86_decode.h"
21*27458df8SWei Liu #include "emulate/x86_emu.h"
2269e0a03cSPaolo Bonzini #include "x86_task.h"
2369e0a03cSPaolo Bonzini #include "x86hvf.h"
24996feed4SSergio Andres Gomez Del Real 
25996feed4SSergio Andres Gomez Del Real #include <Hypervisor/hv.h>
26996feed4SSergio Andres Gomez Del Real #include <Hypervisor/hv_vmx.h>
27996feed4SSergio Andres Gomez Del Real 
28996feed4SSergio Andres Gomez Del Real #include "hw/i386/apic_internal.h"
29996feed4SSergio Andres Gomez Del Real #include "qemu/main-loop.h"
30940e43aaSClaudio Fontana #include "qemu/accel.h"
31996feed4SSergio Andres Gomez Del Real #include "target/i386/cpu.h"
32996feed4SSergio Andres Gomez Del Real 
33996feed4SSergio Andres Gomez Del Real // TODO: taskswitch handling
save_state_to_tss32(CPUState * cpu,struct x86_tss_segment32 * tss)34996feed4SSergio Andres Gomez Del Real static void save_state_to_tss32(CPUState *cpu, struct x86_tss_segment32 *tss)
35996feed4SSergio Andres Gomez Del Real {
36996feed4SSergio Andres Gomez Del Real     X86CPU *x86_cpu = X86_CPU(cpu);
37996feed4SSergio Andres Gomez Del Real     CPUX86State *env = &x86_cpu->env;
38996feed4SSergio Andres Gomez Del Real 
39996feed4SSergio Andres Gomez Del Real     /* CR3 and ldt selector are not saved intentionally */
405d32173fSRoman Bolshakov     tss->eip = (uint32_t)env->eip;
41967f4da2SRoman Bolshakov     tss->eflags = (uint32_t)env->eflags;
42996feed4SSergio Andres Gomez Del Real     tss->eax = EAX(env);
43996feed4SSergio Andres Gomez Del Real     tss->ecx = ECX(env);
44996feed4SSergio Andres Gomez Del Real     tss->edx = EDX(env);
45996feed4SSergio Andres Gomez Del Real     tss->ebx = EBX(env);
46996feed4SSergio Andres Gomez Del Real     tss->esp = ESP(env);
47996feed4SSergio Andres Gomez Del Real     tss->ebp = EBP(env);
48996feed4SSergio Andres Gomez Del Real     tss->esi = ESI(env);
49996feed4SSergio Andres Gomez Del Real     tss->edi = EDI(env);
50996feed4SSergio Andres Gomez Del Real 
516701d81dSPaolo Bonzini     tss->es = vmx_read_segment_selector(cpu, R_ES).sel;
526701d81dSPaolo Bonzini     tss->cs = vmx_read_segment_selector(cpu, R_CS).sel;
536701d81dSPaolo Bonzini     tss->ss = vmx_read_segment_selector(cpu, R_SS).sel;
546701d81dSPaolo Bonzini     tss->ds = vmx_read_segment_selector(cpu, R_DS).sel;
556701d81dSPaolo Bonzini     tss->fs = vmx_read_segment_selector(cpu, R_FS).sel;
566701d81dSPaolo Bonzini     tss->gs = vmx_read_segment_selector(cpu, R_GS).sel;
57996feed4SSergio Andres Gomez Del Real }
58996feed4SSergio Andres Gomez Del Real 
load_state_from_tss32(CPUState * cpu,struct x86_tss_segment32 * tss)59996feed4SSergio Andres Gomez Del Real static void load_state_from_tss32(CPUState *cpu, struct x86_tss_segment32 *tss)
60996feed4SSergio Andres Gomez Del Real {
61996feed4SSergio Andres Gomez Del Real     X86CPU *x86_cpu = X86_CPU(cpu);
62996feed4SSergio Andres Gomez Del Real     CPUX86State *env = &x86_cpu->env;
63996feed4SSergio Andres Gomez Del Real 
643b295bcbSPhilippe Mathieu-Daudé     wvmcs(cpu->accel->fd, VMCS_GUEST_CR3, tss->cr3);
65996feed4SSergio Andres Gomez Del Real 
665d32173fSRoman Bolshakov     env->eip = tss->eip;
67967f4da2SRoman Bolshakov     env->eflags = tss->eflags | 2;
68996feed4SSergio Andres Gomez Del Real 
69996feed4SSergio Andres Gomez Del Real     /* General purpose registers */
70996feed4SSergio Andres Gomez Del Real     RAX(env) = tss->eax;
71996feed4SSergio Andres Gomez Del Real     RCX(env) = tss->ecx;
72996feed4SSergio Andres Gomez Del Real     RDX(env) = tss->edx;
73996feed4SSergio Andres Gomez Del Real     RBX(env) = tss->ebx;
74996feed4SSergio Andres Gomez Del Real     RSP(env) = tss->esp;
75996feed4SSergio Andres Gomez Del Real     RBP(env) = tss->ebp;
76996feed4SSergio Andres Gomez Del Real     RSI(env) = tss->esi;
77996feed4SSergio Andres Gomez Del Real     RDI(env) = tss->edi;
78996feed4SSergio Andres Gomez Del Real 
7925409172SWei Liu     vmx_write_segment_selector(cpu, (x86_segment_selector){{tss->ldt}}, R_LDTR);
8025409172SWei Liu     vmx_write_segment_selector(cpu, (x86_segment_selector){{tss->es}}, R_ES);
8125409172SWei Liu     vmx_write_segment_selector(cpu, (x86_segment_selector){{tss->cs}}, R_CS);
8225409172SWei Liu     vmx_write_segment_selector(cpu, (x86_segment_selector){{tss->ss}}, R_SS);
8325409172SWei Liu     vmx_write_segment_selector(cpu, (x86_segment_selector){{tss->ds}}, R_DS);
8425409172SWei Liu     vmx_write_segment_selector(cpu, (x86_segment_selector){{tss->fs}}, R_FS);
8525409172SWei Liu     vmx_write_segment_selector(cpu, (x86_segment_selector){{tss->gs}}, R_GS);
86996feed4SSergio Andres Gomez Del Real }
87996feed4SSergio Andres Gomez Del Real 
task_switch_32(CPUState * cpu,x86_segment_selector tss_sel,x86_segment_selector old_tss_sel,uint64_t old_tss_base,struct x86_segment_descriptor * new_desc)8825409172SWei Liu static int task_switch_32(CPUState *cpu, x86_segment_selector tss_sel, x86_segment_selector old_tss_sel,
89996feed4SSergio Andres Gomez Del Real                           uint64_t old_tss_base, struct x86_segment_descriptor *new_desc)
90996feed4SSergio Andres Gomez Del Real {
91996feed4SSergio Andres Gomez Del Real     struct x86_tss_segment32 tss_seg;
92996feed4SSergio Andres Gomez Del Real     uint32_t new_tss_base = x86_segment_base(new_desc);
93996feed4SSergio Andres Gomez Del Real     uint32_t eip_offset = offsetof(struct x86_tss_segment32, eip);
94996feed4SSergio Andres Gomez Del Real     uint32_t ldt_sel_offset = offsetof(struct x86_tss_segment32, ldt);
95996feed4SSergio Andres Gomez Del Real 
96996feed4SSergio Andres Gomez Del Real     vmx_read_mem(cpu, &tss_seg, old_tss_base, sizeof(tss_seg));
97996feed4SSergio Andres Gomez Del Real     save_state_to_tss32(cpu, &tss_seg);
98996feed4SSergio Andres Gomez Del Real 
99996feed4SSergio Andres Gomez Del Real     vmx_write_mem(cpu, old_tss_base + eip_offset, &tss_seg.eip, ldt_sel_offset - eip_offset);
100996feed4SSergio Andres Gomez Del Real     vmx_read_mem(cpu, &tss_seg, new_tss_base, sizeof(tss_seg));
101996feed4SSergio Andres Gomez Del Real 
102996feed4SSergio Andres Gomez Del Real     if (old_tss_sel.sel != 0xffff) {
103996feed4SSergio Andres Gomez Del Real         tss_seg.prev_tss = old_tss_sel.sel;
104996feed4SSergio Andres Gomez Del Real 
105996feed4SSergio Andres Gomez Del Real         vmx_write_mem(cpu, new_tss_base, &tss_seg.prev_tss, sizeof(tss_seg.prev_tss));
106996feed4SSergio Andres Gomez Del Real     }
107996feed4SSergio Andres Gomez Del Real     load_state_from_tss32(cpu, &tss_seg);
108996feed4SSergio Andres Gomez Del Real     return 0;
109996feed4SSergio Andres Gomez Del Real }
110996feed4SSergio Andres Gomez Del Real 
vmx_handle_task_switch(CPUState * cpu,x86_segment_selector tss_sel,int reason,bool gate_valid,uint8_t gate,uint64_t gate_type)11125409172SWei Liu void vmx_handle_task_switch(CPUState *cpu, x86_segment_selector tss_sel, int reason, bool gate_valid, uint8_t gate, uint64_t gate_type)
112996feed4SSergio Andres Gomez Del Real {
1133b295bcbSPhilippe Mathieu-Daudé     uint64_t rip = rreg(cpu->accel->fd, HV_X86_RIP);
114996feed4SSergio Andres Gomez Del Real     if (!gate_valid || (gate_type != VMCS_INTR_T_HWEXCEPTION &&
115996feed4SSergio Andres Gomez Del Real                         gate_type != VMCS_INTR_T_HWINTR &&
116996feed4SSergio Andres Gomez Del Real                         gate_type != VMCS_INTR_T_NMI)) {
1173b295bcbSPhilippe Mathieu-Daudé         int ins_len = rvmcs(cpu->accel->fd, VMCS_EXIT_INSTRUCTION_LENGTH);
118996feed4SSergio Andres Gomez Del Real         macvm_set_rip(cpu, rip + ins_len);
119996feed4SSergio Andres Gomez Del Real         return;
120996feed4SSergio Andres Gomez Del Real     }
121996feed4SSergio Andres Gomez Del Real 
122dbccd48dSWei Liu     hvf_load_regs(cpu);
123996feed4SSergio Andres Gomez Del Real 
124996feed4SSergio Andres Gomez Del Real     struct x86_segment_descriptor curr_tss_desc, next_tss_desc;
12525409172SWei Liu     x86_segment_selector old_tss_sel = vmx_read_segment_selector(cpu, R_TR);
1266701d81dSPaolo Bonzini     uint64_t old_tss_base = vmx_read_segment_base(cpu, R_TR);
127996feed4SSergio Andres Gomez Del Real     uint32_t desc_limit;
128996feed4SSergio Andres Gomez Del Real     struct x86_call_gate task_gate_desc;
129996feed4SSergio Andres Gomez Del Real     struct vmx_segment vmx_seg;
130996feed4SSergio Andres Gomez Del Real 
131996feed4SSergio Andres Gomez Del Real     X86CPU *x86_cpu = X86_CPU(cpu);
132996feed4SSergio Andres Gomez Del Real     CPUX86State *env = &x86_cpu->env;
133996feed4SSergio Andres Gomez Del Real 
134996feed4SSergio Andres Gomez Del Real     x86_read_segment_descriptor(cpu, &next_tss_desc, tss_sel);
135996feed4SSergio Andres Gomez Del Real     x86_read_segment_descriptor(cpu, &curr_tss_desc, old_tss_sel);
136996feed4SSergio Andres Gomez Del Real 
137996feed4SSergio Andres Gomez Del Real     if (reason == TSR_IDT_GATE && gate_valid) {
138996feed4SSergio Andres Gomez Del Real         int dpl;
139996feed4SSergio Andres Gomez Del Real 
14019d542ccSPierrick Bouvier         x86_read_call_gate(cpu, &task_gate_desc, gate);
141996feed4SSergio Andres Gomez Del Real 
142996feed4SSergio Andres Gomez Del Real         dpl = task_gate_desc.dpl;
14325409172SWei Liu         x86_segment_selector cs = vmx_read_segment_selector(cpu, R_CS);
144996feed4SSergio Andres Gomez Del Real         if (tss_sel.rpl > dpl || cs.rpl > dpl)
145996feed4SSergio Andres Gomez Del Real             ;//DPRINTF("emulate_gp");
146996feed4SSergio Andres Gomez Del Real     }
147996feed4SSergio Andres Gomez Del Real 
148996feed4SSergio Andres Gomez Del Real     desc_limit = x86_segment_limit(&next_tss_desc);
149996feed4SSergio Andres Gomez Del Real     if (!next_tss_desc.p || ((desc_limit < 0x67 && (next_tss_desc.type & 8)) || desc_limit < 0x2b)) {
150996feed4SSergio Andres Gomez Del Real         VM_PANIC("emulate_ts");
151996feed4SSergio Andres Gomez Del Real     }
152996feed4SSergio Andres Gomez Del Real 
153996feed4SSergio Andres Gomez Del Real     if (reason == TSR_IRET || reason == TSR_JMP) {
154996feed4SSergio Andres Gomez Del Real         curr_tss_desc.type &= ~(1 << 1); /* clear busy flag */
155996feed4SSergio Andres Gomez Del Real         x86_write_segment_descriptor(cpu, &curr_tss_desc, old_tss_sel);
156996feed4SSergio Andres Gomez Del Real     }
157996feed4SSergio Andres Gomez Del Real 
158996feed4SSergio Andres Gomez Del Real     if (reason == TSR_IRET)
159ea48ae91SRoman Bolshakov         env->eflags &= ~NT_MASK;
160996feed4SSergio Andres Gomez Del Real 
161996feed4SSergio Andres Gomez Del Real     if (reason != TSR_CALL && reason != TSR_IDT_GATE)
162996feed4SSergio Andres Gomez Del Real         old_tss_sel.sel = 0xffff;
163996feed4SSergio Andres Gomez Del Real 
164996feed4SSergio Andres Gomez Del Real     if (reason != TSR_IRET) {
165996feed4SSergio Andres Gomez Del Real         next_tss_desc.type |= (1 << 1); /* set busy flag */
166996feed4SSergio Andres Gomez Del Real         x86_write_segment_descriptor(cpu, &next_tss_desc, tss_sel);
167996feed4SSergio Andres Gomez Del Real     }
168996feed4SSergio Andres Gomez Del Real 
16919d542ccSPierrick Bouvier     if (next_tss_desc.type & 8) {
17019d542ccSPierrick Bouvier         task_switch_32(cpu, tss_sel, old_tss_sel, old_tss_base, &next_tss_desc);
17119d542ccSPierrick Bouvier     } else {
172996feed4SSergio Andres Gomez Del Real         //ret = task_switch_16(cpu, tss_sel, old_tss_sel, old_tss_base, &next_tss_desc);
173996feed4SSergio Andres Gomez Del Real         VM_PANIC("task_switch_16");
17419d542ccSPierrick Bouvier     }
175996feed4SSergio Andres Gomez Del Real 
1763b295bcbSPhilippe Mathieu-Daudé     macvm_set_cr0(cpu->accel->fd, rvmcs(cpu->accel->fd, VMCS_GUEST_CR0) |
177704afe34SCameron Esfahani                                 CR0_TS_MASK);
178996feed4SSergio Andres Gomez Del Real     x86_segment_descriptor_to_vmx(cpu, tss_sel, &next_tss_desc, &vmx_seg);
1796701d81dSPaolo Bonzini     vmx_write_segment_descriptor(cpu, &vmx_seg, R_TR);
180996feed4SSergio Andres Gomez Del Real 
181dbccd48dSWei Liu     hvf_store_regs(cpu);
182996feed4SSergio Andres Gomez Del Real 
1833b295bcbSPhilippe Mathieu-Daudé     hv_vcpu_invalidate_tlb(cpu->accel->fd);
184996feed4SSergio Andres Gomez Del Real }
185