2 * Jailhouse, a Linux-based partitioning hypervisor
4 * Copyright (c) Siemens AG, 2013
5 * Copyright (c) Valentine Sinitsyn, 2014
8 * Jan Kiszka <jan.kiszka@siemens.com>
9 * Valentine Sinitsyn <valentine.sinitsyn@gmail.com>
11 * Based on vmx.c written by Jan Kiszka.
13 * This work is licensed under the terms of the GNU GPL, version 2. See
14 * the COPYING file in the top-level directory.
17 #include <jailhouse/entry.h>
18 #include <jailhouse/cell-config.h>
19 #include <jailhouse/control.h>
20 #include <jailhouse/paging.h>
21 #include <jailhouse/printk.h>
22 #include <jailhouse/processor.h>
23 #include <jailhouse/string.h>
24 #include <jailhouse/utils.h>
27 #include <asm/control.h>
28 #include <asm/iommu.h>
29 #include <asm/paging.h>
30 #include <asm/percpu.h>
31 #include <asm/processor.h>
36 * NW bit is ignored by all modern processors, however some
37 * combinations of NW and CD bits are prohibited by SVM (see APMv2,
38 * Sect. 15.5). To handle this, we always keep the NW bit off.
40 #define SVM_CR0_ALLOWED_BITS (~X86_CR0_NW)
42 static bool has_avic, has_assists, has_flush_by_asid;
44 static const struct segment invalid_seg;
46 static struct paging npt_paging[NPT_PAGE_DIR_LEVELS];
48 /* bit cleared: direct access allowed */
49 // TODO: convert to whitelist
50 static u8 __attribute__((aligned(PAGE_SIZE))) msrpm[][0x2000/4] = {
51 [ SVM_MSRPM_0000 ] = {
52 [ 0/4 ... 0x017/4 ] = 0,
53 [ 0x018/4 ... 0x01b/4 ] = 0x80, /* 0x01b (w) */
54 [ 0x01c/4 ... 0x1ff/4 ] = 0,
55 [ 0x200/4 ... 0x273/4 ] = 0xaa, /* 0x200 - 0x273 (w) */
56 [ 0x274/4 ... 0x277/4 ] = 0xea, /* 0x274 - 0x276 (w), 0x277 (rw) */
57 [ 0x278/4 ... 0x2fb/4 ] = 0,
58 [ 0x2fc/4 ... 0x2ff/4 ] = 0x80, /* 0x2ff (w) */
59 [ 0x300/4 ... 0x7ff/4 ] = 0,
60 /* x2APIC MSRs - emulated if not present */
61 [ 0x800/4 ... 0x803/4 ] = 0x90, /* 0x802 (r), 0x803 (r) */
62 [ 0x804/4 ... 0x807/4 ] = 0,
63 [ 0x808/4 ... 0x80b/4 ] = 0x93, /* 0x808 (rw), 0x80a (r), 0x80b (w) */
64 [ 0x80c/4 ... 0x80f/4 ] = 0xc8, /* 0x80d (w), 0x80f (rw) */
65 [ 0x810/4 ... 0x813/4 ] = 0x55, /* 0x810 - 0x813 (r) */
66 [ 0x814/4 ... 0x817/4 ] = 0x55, /* 0x814 - 0x817 (r) */
67 [ 0x818/4 ... 0x81b/4 ] = 0x55, /* 0x818 - 0x81b (r) */
68 [ 0x81c/4 ... 0x81f/4 ] = 0x55, /* 0x81c - 0x81f (r) */
69 [ 0x820/4 ... 0x823/4 ] = 0x55, /* 0x820 - 0x823 (r) */
70 [ 0x824/4 ... 0x827/4 ] = 0x55, /* 0x823 - 0x827 (r) */
71 [ 0x828/4 ... 0x82b/4 ] = 0x03, /* 0x828 (rw) */
72 [ 0x82c/4 ... 0x82f/4 ] = 0xc0, /* 0x82f (rw) */
73 [ 0x830/4 ... 0x833/4 ] = 0xf3, /* 0x830 (rw), 0x832 (rw), 0x833 (rw) */
74 [ 0x834/4 ... 0x837/4 ] = 0xff, /* 0x834 - 0x837 (rw) */
75 [ 0x838/4 ... 0x83b/4 ] = 0x07, /* 0x838 (rw), 0x839 (r) */
76 [ 0x83c/4 ... 0x83f/4 ] = 0x70, /* 0x83e (rw), 0x83f (r) */
77 [ 0x840/4 ... 0x1fff/4 ] = 0,
79 [ SVM_MSRPM_C000 ] = {
80 [ 0/4 ... 0x07f/4 ] = 0,
81 [ 0x080/4 ... 0x083/4 ] = 0x02, /* 0x080 (w) */
82 [ 0x084/4 ... 0x1fff/4 ] = 0
84 [ SVM_MSRPM_C001 ] = {
85 [ 0/4 ... 0x1fff/4 ] = 0,
87 [ SVM_MSRPM_RESV ] = {
88 [ 0/4 ... 0x1fff/4 ] = 0,
92 /* This page is mapped so the code begins at 0x000ffff0 */
93 static u8 __attribute__((aligned(PAGE_SIZE))) parking_code[PAGE_SIZE] = {
94 [0xff0] = 0xfa, /* 1: cli */
95 [0xff1] = 0xf4, /* hlt */
97 [0xff3] = 0xfc /* jmp 1b */
100 static void *parked_mode_npt;
102 static void *avic_page;
104 static int svm_check_features(void)
106 /* SVM is available */
107 if (!(cpuid_ecx(0x80000001) & X86_FEATURE_SVM))
108 return trace_error(-ENODEV);
111 if (!(cpuid_edx(0x8000000A) & X86_FEATURE_NP))
112 return trace_error(-EIO);
115 if ((cpuid_edx(0x8000000A) & X86_FEATURE_DECODE_ASSISTS))
119 if (cpuid_edx(0x8000000A) & X86_FEATURE_AVIC)
122 /* TLB Flush by ASID support */
123 if (cpuid_edx(0x8000000A) & X86_FEATURE_FLUSH_BY_ASID)
124 has_flush_by_asid = true;
129 static void set_svm_segment_from_dtr(struct svm_segment *svm_segment,
130 const struct desc_table_reg *dtr)
132 svm_segment->base = dtr->base;
133 svm_segment->limit = dtr->limit & 0xffff;
136 static void set_svm_segment_from_segment(struct svm_segment *svm_segment,
137 const struct segment *segment)
139 svm_segment->selector = segment->selector;
140 svm_segment->access_rights = ((segment->access_rights & 0xf000) >> 4) |
141 (segment->access_rights & 0x00ff);
142 svm_segment->limit = segment->limit;
143 svm_segment->base = segment->base;
146 static void svm_set_cell_config(struct cell *cell, struct vmcb *vmcb)
148 vmcb->iopm_base_pa = paging_hvirt2phys(cell->svm.iopm);
149 vmcb->n_cr3 = paging_hvirt2phys(cell->svm.npt_structs.root_table);
152 static void vmcb_setup(struct per_cpu *cpu_data)
154 struct vmcb *vmcb = &cpu_data->vmcb;
156 memset(vmcb, 0, sizeof(struct vmcb));
158 vmcb->cr0 = cpu_data->linux_cr0 & SVM_CR0_ALLOWED_BITS;
159 vmcb->cr3 = cpu_data->linux_cr3;
160 vmcb->cr4 = cpu_data->linux_cr4;
162 set_svm_segment_from_segment(&vmcb->cs, &cpu_data->linux_cs);
163 set_svm_segment_from_segment(&vmcb->ds, &cpu_data->linux_ds);
164 set_svm_segment_from_segment(&vmcb->es, &cpu_data->linux_es);
165 set_svm_segment_from_segment(&vmcb->fs, &cpu_data->linux_fs);
166 set_svm_segment_from_segment(&vmcb->gs, &cpu_data->linux_gs);
167 set_svm_segment_from_segment(&vmcb->ss, &invalid_seg);
168 set_svm_segment_from_segment(&vmcb->tr, &cpu_data->linux_tss);
169 set_svm_segment_from_segment(&vmcb->ldtr, &invalid_seg);
171 set_svm_segment_from_dtr(&vmcb->gdtr, &cpu_data->linux_gdtr);
172 set_svm_segment_from_dtr(&vmcb->idtr, &cpu_data->linux_idtr);
174 vmcb->cpl = 0; /* Linux runs in ring 0 before migration */
177 /* Indicate success to the caller of arch_entry */
179 vmcb->rsp = cpu_data->linux_sp +
180 (NUM_ENTRY_REGS + 1) * sizeof(unsigned long);
181 vmcb->rip = cpu_data->linux_ip;
183 vmcb->sysenter_cs = read_msr(MSR_IA32_SYSENTER_CS);
184 vmcb->sysenter_eip = read_msr(MSR_IA32_SYSENTER_EIP);
185 vmcb->sysenter_esp = read_msr(MSR_IA32_SYSENTER_ESP);
186 vmcb->star = read_msr(MSR_STAR);
187 vmcb->lstar = read_msr(MSR_LSTAR);
188 vmcb->cstar = read_msr(MSR_CSTAR);
189 vmcb->sfmask = read_msr(MSR_SFMASK);
190 vmcb->kerngsbase = read_msr(MSR_KERNGS_BASE);
192 vmcb->dr6 = 0x00000ff0;
193 vmcb->dr7 = 0x00000400;
195 /* Make the hypervisor visible */
196 vmcb->efer = (cpu_data->linux_efer | EFER_SVME);
198 vmcb->g_pat = cpu_data->pat;
200 vmcb->general1_intercepts |= GENERAL1_INTERCEPT_NMI;
201 vmcb->general1_intercepts |= GENERAL1_INTERCEPT_CR0_SEL_WRITE;
202 vmcb->general1_intercepts |= GENERAL1_INTERCEPT_CPUID;
203 vmcb->general1_intercepts |= GENERAL1_INTERCEPT_IOIO_PROT;
204 vmcb->general1_intercepts |= GENERAL1_INTERCEPT_MSR_PROT;
205 vmcb->general1_intercepts |= GENERAL1_INTERCEPT_SHUTDOWN_EVT;
207 vmcb->general2_intercepts |= GENERAL2_INTERCEPT_VMRUN; /* Required */
208 vmcb->general2_intercepts |= GENERAL2_INTERCEPT_VMMCALL;
210 vmcb->msrpm_base_pa = paging_hvirt2phys(msrpm);
213 /* No more than one guest owns the CPU */
214 vmcb->guest_asid = 1;
216 /* TODO: Setup AVIC */
218 /* Explicitly mark all of the state as new */
219 vmcb->clean_bits = 0;
221 svm_set_cell_config(cpu_data->cell, vmcb);
224 unsigned long arch_paging_gphys2phys(struct per_cpu *cpu_data,
228 return paging_virt2phys(&cpu_data->cell->svm.npt_structs,
232 static void npt_set_next_pt(pt_entry_t pte, unsigned long next_pt)
234 /* See APMv2, Section 15.25.5 */
235 *pte = (next_pt & 0x000ffffffffff000UL) |
236 (PAGE_DEFAULT_FLAGS | PAGE_FLAG_US);
239 int vcpu_vendor_init(void)
241 struct paging_structures parking_pt;
245 err = svm_check_features();
249 vm_cr = read_msr(MSR_VM_CR);
250 if (vm_cr & VM_CR_SVMDIS)
251 /* SVM disabled in BIOS */
252 return trace_error(-EPERM);
254 /* Nested paging is the same as the native one */
255 memcpy(npt_paging, x86_64_paging, sizeof(npt_paging));
256 for (n = 0; n < NPT_PAGE_DIR_LEVELS; n++)
257 npt_paging[n].set_next_pt = npt_set_next_pt;
259 /* Map guest parking code (shared between cells and CPUs) */
260 parking_pt.root_paging = npt_paging;
261 parking_pt.root_table = parked_mode_npt = page_alloc(&mem_pool, 1);
262 if (!parked_mode_npt)
264 err = paging_create(&parking_pt, paging_hvirt2phys(parking_code),
265 PAGE_SIZE, 0x000ff000,
266 PAGE_READONLY_FLAGS | PAGE_FLAG_US,
267 PAGING_NON_COHERENT);
271 /* This is always false for AMD now (except in nested SVM);
272 see Sect. 16.3.1 in APMv2 */
274 /* allow direct x2APIC access except for ICR writes */
275 memset(&msrpm[SVM_MSRPM_0000][MSR_X2APIC_BASE/4], 0,
276 (MSR_X2APIC_END - MSR_X2APIC_BASE + 1)/4);
277 msrpm[SVM_MSRPM_0000][MSR_X2APIC_ICR/4] = 0x02;
280 avic_page = page_alloc(&remap_pool, 1);
282 return trace_error(-ENOMEM);
286 return vcpu_cell_init(&root_cell);
289 int vcpu_vendor_cell_init(struct cell *cell)
294 /* allocate iopm (two 4-K pages + 3 bits) */
295 cell->svm.iopm = page_alloc(&mem_pool, 3);
299 /* build root NPT of cell */
300 cell->svm.npt_structs.root_paging = npt_paging;
301 cell->svm.npt_structs.root_table = (page_table_t)cell->root_table_page;
305 * Map xAPIC as is; reads are passed, writes are trapped.
307 flags = PAGE_READONLY_FLAGS | PAGE_FLAG_US | PAGE_FLAG_DEVICE;
308 err = paging_create(&cell->svm.npt_structs, XAPIC_BASE,
309 PAGE_SIZE, XAPIC_BASE,
311 PAGING_NON_COHERENT);
313 flags = PAGE_DEFAULT_FLAGS | PAGE_FLAG_DEVICE;
314 err = paging_create(&cell->svm.npt_structs,
315 paging_hvirt2phys(avic_page),
316 PAGE_SIZE, XAPIC_BASE,
318 PAGING_NON_COHERENT);
326 page_free(&mem_pool, cell->svm.iopm, 3);
331 int vcpu_map_memory_region(struct cell *cell,
332 const struct jailhouse_memory *mem)
334 u64 phys_start = mem->phys_start;
335 u64 flags = PAGE_FLAG_US; /* See APMv2, Section 15.25.5 */
337 if (mem->flags & JAILHOUSE_MEM_READ)
338 flags |= PAGE_FLAG_PRESENT;
339 if (mem->flags & JAILHOUSE_MEM_WRITE)
340 flags |= PAGE_FLAG_RW;
341 if (!(mem->flags & JAILHOUSE_MEM_EXECUTE))
342 flags |= PAGE_FLAG_NOEXECUTE;
343 if (mem->flags & JAILHOUSE_MEM_COMM_REGION)
344 phys_start = paging_hvirt2phys(&cell->comm_page);
346 return paging_create(&cell->svm.npt_structs, phys_start, mem->size,
347 mem->virt_start, flags, PAGING_NON_COHERENT);
350 int vcpu_unmap_memory_region(struct cell *cell,
351 const struct jailhouse_memory *mem)
353 return paging_destroy(&cell->svm.npt_structs, mem->virt_start,
354 mem->size, PAGING_NON_COHERENT);
357 void vcpu_vendor_cell_exit(struct cell *cell)
359 paging_destroy(&cell->svm.npt_structs, XAPIC_BASE, PAGE_SIZE,
360 PAGING_NON_COHERENT);
361 page_free(&mem_pool, cell->svm.iopm, 3);
364 int vcpu_init(struct per_cpu *cpu_data)
369 err = svm_check_features();
373 efer = read_msr(MSR_EFER);
374 if (efer & EFER_SVME)
375 return trace_error(-EBUSY);
378 write_msr(MSR_EFER, efer);
380 cpu_data->svm_state = SVMON;
382 vmcb_setup(cpu_data);
385 * APM Volume 2, 3.1.1: "When writing the CR0 register, software should
386 * set the values of reserved bits to the values found during the
387 * previous CR0 read."
388 * But we want to avoid surprises with new features unknown to us but
389 * set by Linux. So check if any assumed revered bit was set and bail
391 * Note that the APM defines all reserved CR4 bits as must-be-zero.
393 if (cpu_data->linux_cr0 & X86_CR0_RESERVED)
396 /* bring CR0 and CR4 into well-defined states */
397 write_cr0(X86_CR0_HOST_STATE);
398 write_cr4(X86_CR4_HOST_STATE);
400 write_msr(MSR_VM_HSAVE_PA, paging_hvirt2phys(cpu_data->host_state));
405 void vcpu_exit(struct per_cpu *cpu_data)
409 if (cpu_data->svm_state == SVMOFF)
412 cpu_data->svm_state = SVMOFF;
414 /* We are leaving - set the GIF */
415 asm volatile ("stgi" : : : "memory");
417 efer = read_msr(MSR_EFER);
419 write_msr(MSR_EFER, efer);
421 write_msr(MSR_VM_HSAVE_PA, 0);
424 void __attribute__((noreturn)) vcpu_activate_vmm(struct per_cpu *cpu_data)
426 unsigned long vmcb_pa, host_stack;
428 vmcb_pa = paging_hvirt2phys(&cpu_data->vmcb);
429 host_stack = (unsigned long)cpu_data->stack + sizeof(cpu_data->stack);
431 /* We enter Linux at the point arch_entry would return to as well.
432 * rax is cleared to signal success to the caller. */
435 "mov (%%rdi),%%r15\n\t"
436 "mov 0x8(%%rdi),%%r14\n\t"
437 "mov 0x10(%%rdi),%%r13\n\t"
438 "mov 0x18(%%rdi),%%r12\n\t"
439 "mov 0x20(%%rdi),%%rbx\n\t"
440 "mov 0x28(%%rdi),%%rbp\n\t"
445 : "D" (cpu_data->linux_reg), "a" (vmcb_pa), "m" (host_stack));
446 __builtin_unreachable();
449 void __attribute__((noreturn)) vcpu_deactivate_vmm(void)
451 struct per_cpu *cpu_data = this_cpu_data();
452 struct vmcb *vmcb = &cpu_data->vmcb;
453 unsigned long *stack = (unsigned long *)vmcb->rsp;
454 unsigned long linux_ip = vmcb->rip;
456 cpu_data->linux_cr0 = vmcb->cr0;
457 cpu_data->linux_cr3 = vmcb->cr3;
459 cpu_data->linux_gdtr.base = vmcb->gdtr.base;
460 cpu_data->linux_gdtr.limit = vmcb->gdtr.limit;
461 cpu_data->linux_idtr.base = vmcb->idtr.base;
462 cpu_data->linux_idtr.limit = vmcb->idtr.limit;
464 cpu_data->linux_cs.selector = vmcb->cs.selector;
466 asm volatile("str %0" : "=m" (cpu_data->linux_tss.selector));
468 cpu_data->linux_efer = vmcb->efer & (~EFER_SVME);
469 cpu_data->linux_fs.base = vmcb->fs.base;
470 cpu_data->linux_gs.base = vmcb->gs.base;
472 cpu_data->linux_ds.selector = vmcb->ds.selector;
473 cpu_data->linux_es.selector = vmcb->es.selector;
475 asm volatile("mov %%fs,%0" : "=m" (cpu_data->linux_fs.selector));
476 asm volatile("mov %%gs,%0" : "=m" (cpu_data->linux_gs.selector));
478 arch_cpu_restore(cpu_data, 0);
484 "mov %%rbx,%%rsp\n\t"
500 "mov %%rax,%%rsp\n\t"
501 "xor %%rax,%%rax\n\t"
503 : : "a" (stack), "b" (&cpu_data->guest_regs));
504 __builtin_unreachable();
507 static void svm_vcpu_reset(struct per_cpu *cpu_data, unsigned int sipi_vector)
509 static const struct svm_segment dataseg_reset_state = {
513 .access_rights = 0x0093,
515 static const struct svm_segment dtr_reset_state = {
521 struct vmcb *vmcb = &cpu_data->vmcb;
524 vmcb->cr0 = X86_CR0_NW | X86_CR0_CD | X86_CR0_ET;
531 if (sipi_vector == APIC_BSP_PSEUDO_SIPI) {
538 vmcb->cs.selector = sipi_vector << 8;
539 vmcb->cs.base = sipi_vector << 12;
540 vmcb->cs.limit = 0xffff;
541 vmcb->cs.access_rights = 0x009b;
543 vmcb->ds = dataseg_reset_state;
544 vmcb->es = dataseg_reset_state;
545 vmcb->fs = dataseg_reset_state;
546 vmcb->gs = dataseg_reset_state;
547 vmcb->ss = dataseg_reset_state;
549 vmcb->tr.selector = 0;
551 vmcb->tr.limit = 0xffff;
552 vmcb->tr.access_rights = 0x008b;
554 vmcb->ldtr.selector = 0;
556 vmcb->ldtr.limit = 0xffff;
557 vmcb->ldtr.access_rights = 0x0082;
559 vmcb->gdtr = dtr_reset_state;
560 vmcb->idtr = dtr_reset_state;
562 vmcb->efer = EFER_SVME;
564 /* These MSRs are undefined on reset */
569 vmcb->sysenter_cs = 0;
570 vmcb->sysenter_eip = 0;
571 vmcb->sysenter_esp = 0;
572 vmcb->kerngsbase = 0;
574 vmcb->dr7 = 0x00000400;
576 /* Almost all of the guest state changed */
577 vmcb->clean_bits = 0;
579 svm_set_cell_config(cpu_data->cell, vmcb);
583 : : "a" (paging_hvirt2phys(vmcb)) : "memory");
584 /* vmload overwrites GS_BASE - restore the host state */
585 write_msr(MSR_GS_BASE, (unsigned long)cpu_data);
588 void vcpu_skip_emulated_instruction(unsigned int inst_len)
590 this_cpu_data()->vmcb.rip += inst_len;
593 static void update_efer(struct vmcb *vmcb)
595 unsigned long efer = vmcb->efer;
597 if ((efer & (EFER_LME | EFER_LMA)) != EFER_LME)
602 /* Flush TLB on LMA/LME change: See APMv2, Sect. 15.16 */
603 if ((vmcb->efer ^ efer) & EFER_LMA)
607 vmcb->clean_bits &= ~CLEAN_BITS_CRX;
610 bool vcpu_get_guest_paging_structs(struct guest_paging_structures *pg_structs)
612 struct vmcb *vmcb = &this_cpu_data()->vmcb;
614 if (vmcb->efer & EFER_LMA) {
615 pg_structs->root_paging = x86_64_paging;
616 pg_structs->root_table_gphys =
617 vmcb->cr3 & 0x000ffffffffff000UL;
618 } else if ((vmcb->cr0 & X86_CR0_PG) &&
619 !(vmcb->cr4 & X86_CR4_PAE)) {
620 pg_structs->root_paging = i386_paging;
621 pg_structs->root_table_gphys =
622 vmcb->cr3 & 0xfffff000UL;
623 } else if (!(vmcb->cr0 & X86_CR0_PG)) {
625 * Can be in non-paged protected mode as well, but
626 * the translation mechanism will stay the same ayway.
628 pg_structs->root_paging = realmode_paging;
630 * This will make paging_get_guest_pages map the page
631 * that also contains the bootstrap code and, thus, is
632 * always present in a cell.
634 pg_structs->root_table_gphys = 0xff000;
636 printk("FATAL: Unsupported paging mode\n");
642 void vcpu_vendor_set_guest_pat(unsigned long val)
644 struct vmcb *vmcb = &this_cpu_data()->vmcb;
647 vmcb->clean_bits &= ~CLEAN_BITS_NP;
650 struct parse_context {
651 unsigned int remaining;
653 unsigned long cs_base;
657 static bool ctx_advance(struct parse_context *ctx,
659 struct guest_paging_structures *pg_structs)
662 ctx->size = ctx->remaining;
663 ctx->inst = vcpu_map_inst(pg_structs, ctx->cs_base + *pc,
667 ctx->remaining -= ctx->size;
673 static bool svm_parse_mov_to_cr(struct vmcb *vmcb, unsigned long pc,
674 unsigned char reg, unsigned long *gpr)
676 struct guest_paging_structures pg_structs;
677 struct parse_context ctx = {};
678 /* No prefixes are supported yet */
679 u8 opcodes[] = {0x0f, 0x22}, modrm;
682 ctx.remaining = ARRAY_SIZE(opcodes);
683 if (!vcpu_get_guest_paging_structs(&pg_structs))
685 ctx.cs_base = (vmcb->efer & EFER_LMA) ? 0 : vmcb->cs.base;
687 if (!ctx_advance(&ctx, &pc, &pg_structs))
690 for (n = 0; n < ARRAY_SIZE(opcodes); n++, ctx.inst++)
691 if (*(ctx.inst) != opcodes[n] ||
692 !ctx_advance(&ctx, &pc, &pg_structs))
695 if (!ctx_advance(&ctx, &pc, &pg_structs))
700 if (((modrm & 0x38) >> 3) != reg)
704 *gpr = (modrm & 0x7);
710 * XXX: The only visible reason to have this function (vmx.c consistency
711 * aside) is to prevent cells from setting invalid CD+NW combinations that
712 * result in no more than VMEXIT_INVALID. Maybe we can get along without it
715 static bool svm_handle_cr(struct per_cpu *cpu_data)
717 struct vmcb *vmcb = &cpu_data->vmcb;
718 /* Workaround GCC 4.8 warning on uninitialized variable 'reg' */
719 unsigned long reg = -1, val, bits;
722 if (!(vmcb->exitinfo1 & (1UL << 63))) {
723 panic_printk("FATAL: Unsupported CR access (LMSW or CLTS)\n");
726 reg = vmcb->exitinfo1 & 0x07;
728 if (!svm_parse_mov_to_cr(vmcb, vmcb->rip, 0, ®)) {
729 panic_printk("FATAL: Unable to parse MOV-to-CR instruction\n");
737 val = cpu_data->guest_regs.by_index[15 - reg];
739 vcpu_skip_emulated_instruction(X86_INST_LEN_MOV_TO_CR);
740 /* Flush TLB on PG/WP/CD/NW change: See APMv2, Sect. 15.16 */
741 bits = (X86_CR0_PG | X86_CR0_WP | X86_CR0_CD | X86_CR0_NW);
742 if ((val ^ vmcb->cr0) & bits)
744 /* TODO: better check for #GP reasons */
745 vmcb->cr0 = val & SVM_CR0_ALLOWED_BITS;
746 if (val & X86_CR0_PG)
748 vmcb->clean_bits &= ~CLEAN_BITS_CRX;
753 static bool svm_handle_msr_write(struct per_cpu *cpu_data)
755 struct vmcb *vmcb = &cpu_data->vmcb;
758 if (cpu_data->guest_regs.rcx == MSR_EFER) {
759 /* Never let a guest to disable SVME; see APMv2, Sect. 3.1.7 */
760 efer = get_wrmsr_value(&cpu_data->guest_regs) | EFER_SVME;
761 /* Flush TLB on LME/NXE change: See APMv2, Sect. 15.16 */
762 if ((efer ^ vmcb->efer) & (EFER_LME | EFER_NXE))
765 vmcb->clean_bits &= ~CLEAN_BITS_CRX;
766 vcpu_skip_emulated_instruction(X86_INST_LEN_WRMSR);
770 return vcpu_handle_msr_write();
774 * TODO: This handles unaccelerated (non-AVIC) access. AVIC should
775 * be treated separately in svm_handle_avic_access().
777 static bool svm_handle_apic_access(struct vmcb *vmcb)
779 struct guest_paging_structures pg_structs;
780 unsigned int inst_len, offset;
783 /* The caller is responsible for sanity checks */
784 is_write = !!(vmcb->exitinfo1 & 0x2);
785 offset = vmcb->exitinfo2 - XAPIC_BASE;
790 if (!vcpu_get_guest_paging_structs(&pg_structs))
793 inst_len = apic_mmio_access(vmcb->rip, &pg_structs, offset >> 4,
798 vcpu_skip_emulated_instruction(inst_len);
802 panic_printk("FATAL: Unhandled APIC access, offset %d, is_write: %d\n",
807 static void dump_guest_regs(union registers *guest_regs, struct vmcb *vmcb)
809 panic_printk("RIP: %p RSP: %p FLAGS: %x\n", vmcb->rip,
810 vmcb->rsp, vmcb->rflags);
811 panic_printk("RAX: %p RBX: %p RCX: %p\n", guest_regs->rax,
812 guest_regs->rbx, guest_regs->rcx);
813 panic_printk("RDX: %p RSI: %p RDI: %p\n", guest_regs->rdx,
814 guest_regs->rsi, guest_regs->rdi);
815 panic_printk("CS: %x BASE: %p AR-BYTES: %x EFER.LMA %d\n",
816 vmcb->cs.selector, vmcb->cs.base, vmcb->cs.access_rights,
817 !!(vmcb->efer & EFER_LMA));
818 panic_printk("CR0: %p CR3: %p CR4: %p\n", vmcb->cr0,
819 vmcb->cr3, vmcb->cr4);
820 panic_printk("EFER: %p\n", vmcb->efer);
823 void vcpu_vendor_get_io_intercept(struct vcpu_io_intercept *io)
825 struct vmcb *vmcb = &this_cpu_data()->vmcb;
826 u64 exitinfo = vmcb->exitinfo1;
828 /* parse exit info for I/O instructions (see APM, 15.10.2 ) */
829 io->port = (exitinfo >> 16) & 0xFFFF;
830 io->size = (exitinfo >> 4) & 0x7;
831 io->in = !!(exitinfo & 0x1);
832 io->inst_len = vmcb->exitinfo2 - vmcb->rip;
833 io->rep_or_str = !!(exitinfo & 0x0c);
836 void vcpu_vendor_get_mmio_intercept(struct vcpu_mmio_intercept *mmio)
838 struct vmcb *vmcb = &this_cpu_data()->vmcb;
840 mmio->phys_addr = vmcb->exitinfo2;
841 mmio->is_write = !!(vmcb->exitinfo1 & 0x2);
844 void vcpu_handle_exit(struct per_cpu *cpu_data)
846 struct vmcb *vmcb = &cpu_data->vmcb;
850 vmcb->gs.base = read_msr(MSR_GS_BASE);
852 /* Restore GS value expected by per_cpu data accessors */
853 write_msr(MSR_GS_BASE, (unsigned long)cpu_data);
855 cpu_data->stats[JAILHOUSE_CPU_STAT_VMEXITS_TOTAL]++;
857 * All guest state is marked unmodified; individual handlers must clear
858 * the bits as needed.
860 vmcb->clean_bits = 0xffffffff;
862 switch (vmcb->exitcode) {
864 panic_printk("FATAL: VM-Entry failure, error %d\n",
868 cpu_data->stats[JAILHOUSE_CPU_STAT_VMEXITS_MANAGEMENT]++;
869 /* Temporarily enable GIF to consume pending NMI */
870 asm volatile("stgi; clgi" : : : "memory");
871 sipi_vector = x86_handle_events(cpu_data);
872 if (sipi_vector >= 0) {
873 printk("CPU %d received SIPI, vector %x\n",
874 cpu_data->cpu_id, sipi_vector);
875 svm_vcpu_reset(cpu_data, sipi_vector);
876 vcpu_reset(sipi_vector == APIC_BSP_PSEUDO_SIPI);
878 iommu_check_pending_faults();
881 vcpu_handle_hypercall();
883 case VMEXIT_CR0_SEL_WRITE:
884 cpu_data->stats[JAILHOUSE_CPU_STAT_VMEXITS_CR]++;
885 if (svm_handle_cr(cpu_data))
892 cpu_data->stats[JAILHOUSE_CPU_STAT_VMEXITS_MSR]++;
893 if (!vmcb->exitinfo1)
894 res = vcpu_handle_msr_read();
896 res = svm_handle_msr_write(cpu_data);
901 if ((vmcb->exitinfo1 & 0x7) == 0x7 &&
902 vmcb->exitinfo2 >= XAPIC_BASE &&
903 vmcb->exitinfo2 < XAPIC_BASE + PAGE_SIZE) {
904 /* APIC access in non-AVIC mode */
905 cpu_data->stats[JAILHOUSE_CPU_STAT_VMEXITS_XAPIC]++;
906 if (svm_handle_apic_access(vmcb))
909 /* General MMIO (IOAPIC, PCI etc) */
910 cpu_data->stats[JAILHOUSE_CPU_STAT_VMEXITS_MMIO]++;
911 if (vcpu_handle_mmio_access())
915 panic_printk("FATAL: Unhandled Nested Page Fault for (%p), "
916 "error code is %x\n", vmcb->exitinfo2,
917 vmcb->exitinfo1 & 0xf);
920 if (vcpu_handle_xsetbv())
924 cpu_data->stats[JAILHOUSE_CPU_STAT_VMEXITS_PIO]++;
925 if (vcpu_handle_io_access())
928 /* TODO: Handle VMEXIT_AVIC_NOACCEL and VMEXIT_AVIC_INCOMPLETE_IPI */
930 panic_printk("FATAL: Unexpected #VMEXIT, exitcode %x, "
931 "exitinfo1 %p exitinfo2 %p\n",
932 vmcb->exitcode, vmcb->exitinfo1, vmcb->exitinfo2);
934 dump_guest_regs(&cpu_data->guest_regs, vmcb);
938 write_msr(MSR_GS_BASE, vmcb->gs.base);
943 svm_vcpu_reset(this_cpu_data(), APIC_BSP_PSEUDO_SIPI);
944 /* No need to clear VMCB Clean bit: vcpu_reset() already does this */
945 this_cpu_data()->vmcb.n_cr3 = paging_hvirt2phys(parked_mode_npt);
950 void vcpu_nmi_handler(void)
954 void vcpu_tlb_flush(void)
956 struct vmcb *vmcb = &this_cpu_data()->vmcb;
958 if (has_flush_by_asid)
959 vmcb->tlb_control = SVM_TLB_FLUSH_GUEST;
961 vmcb->tlb_control = SVM_TLB_FLUSH_ALL;
964 const u8 *vcpu_get_inst_bytes(const struct guest_paging_structures *pg_structs,
965 unsigned long pc, unsigned int *size)
967 struct vmcb *vmcb = &this_cpu_data()->vmcb;
973 start = vmcb->rip - pc;
974 if (start < vmcb->bytes_fetched) {
975 *size = vmcb->bytes_fetched - start;
976 return &vmcb->guest_bytes[start];
981 return vcpu_map_inst(pg_structs, pc, size);
985 void vcpu_vendor_get_cell_io_bitmap(struct cell *cell,
986 struct vcpu_io_bitmap *iobm)
988 iobm->data = cell->svm.iopm;
989 iobm->size = sizeof(cell->svm.iopm);
992 void vcpu_vendor_get_execution_state(struct vcpu_execution_state *x_state)
994 struct vmcb *vmcb = &this_cpu_data()->vmcb;
996 x_state->efer = vmcb->efer;
997 x_state->rflags = vmcb->rflags;
998 x_state->cs = vmcb->cs.selector;
999 x_state->rip = vmcb->rip;
1002 /* GIF must be set for interrupts to be delivered (APMv2, Sect. 15.17) */
1003 void enable_irq(void)
1005 asm volatile("stgi; sti" : : : "memory");
1008 /* Jailhouse runs with GIF cleared, so we need to restore this state */
1009 void disable_irq(void)
1011 asm volatile("cli; clgi" : : : "memory");