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fixed guest state errors, need to handle exits now

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merge-requests/1/head
_xeroxz 3 years ago
parent c587c20e3f
commit 056a4bed38
9 changed files with 223 additions and 41 deletions
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2
exit_handler.cpp
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@ -4,6 +4,7 @@ auto exit_handler(hv::pguest_registers regs) -> void
{
u64 exit_reason;
__vmx_vmread(VMCS_EXIT_REASON, &exit_reason);
__debugbreak();
switch (exit_reason)
{
@ -17,6 +18,7 @@ auto exit_handler(hv::pguest_registers regs) -> void
case VMX_EXIT_REASON_EXECUTE_VMPTRLD:
case VMX_EXIT_REASON_EXECUTE_VMPTRST:
case VMX_EXIT_REASON_EXECUTE_VMCLEAR:
case VMX_EXIT_REASON_EXECUTE_VMLAUNCH:
case VMX_EXIT_REASON_EXECUTE_RDTSC:
default:
break;

5
hv_types.hpp
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@ -19,12 +19,15 @@ extern "C" void _sgdt(void*);
#pragma intrinsic(_sgdt);
#ifdef DBG_PRINT_BOOL
#define DBG_PRINT(format, ...) DbgPrintEx( DPFLTR_SYSTEM_ID, DPFLTR_ERROR_LEVEL, "[hv [core number = %d]]" format, KeGetCurrentProcessorNumber(), __VA_ARGS__)
#define DBG_PRINT(format, ...) \
DbgPrintEx( DPFLTR_SYSTEM_ID, DPFLTR_ERROR_LEVEL, \
"[hv [core number = %d]]" format, KeGetCurrentProcessorNumber(), __VA_ARGS__)
#else
#define DBG_PRINT(format, ...)
#endif
#define HOST_STACK_PAGES 6
#define HOST_STACK_SIZE PAGE_SIZE * HOST_STACK_PAGES
namespace hv
{

6
ia32.hpp
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@ -17819,6 +17819,7 @@ typedef union
*/
typedef union
{
uint32_t flags;
struct
{
/**
@ -17904,8 +17905,6 @@ typedef union
#define VMX_SEGMENT_ACCESS_RIGHTS_UNUSABLE(_) (((_) >> 16) & 0x01)
uint32_t reserved2 : 15;
};
uint32_t flags;
} vmx_segment_access_rights;
/**
@ -20783,6 +20782,7 @@ typedef union
*/
typedef union
{
uint64_t flags;
struct
{
/**
@ -20987,8 +20987,6 @@ typedef union
#define RFLAGS_IDENTIFICATION_FLAG(_) (((_) >> 21) & 0x01)
uint64_t reserved4 : 42;
};
uint64_t flags;
} rflags;
/**

13
segment.cpp
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@ -5,6 +5,8 @@ namespace segment
auto get_access_rights(segment_descriptor_64* segment_descriptor) -> vmx_segment_access_rights
{
vmx_segment_access_rights result;
result.flags = NULL;
result.granularity = segment_descriptor->granularity;
result.type = segment_descriptor->type;
result.descriptor_type = segment_descriptor->descriptor_type;
@ -12,23 +14,24 @@ namespace segment
result.long_mode = segment_descriptor->long_mode;
result.available_bit = segment_descriptor->system;
result.default_big = segment_descriptor->default_big;
result.descriptor_privilege_level = segment_descriptor->descriptor_privilege_level;
result.unusable = !segment_descriptor->present;
return result;
}
auto get_info(segment_descriptor_register_64 gdt_value, segment_selector segment_selector) -> hv::segment_info_ctx
auto get_info(const segment_descriptor_register_64& gdt_value, segment_selector selector) -> hv::segment_info_ctx
{
hv::segment_info_ctx segment_info;
memset(&segment_info, NULL, sizeof segment_info);
// GDT->BaseAddress + (segment index << 3)
// gives us a pointer to the segment descriptor...
const auto segment_descriptor =
reinterpret_cast<segment_descriptor_64*>(
gdt_value.base_address + (segment_selector.index << SEGMENT_SELECTOR_INDEX_BIT));
gdt_value.base_address + (selector.index << SEGMENT_SELECTOR_INDEX_BIT));
// access rights are spread out over the segment
// descriptor so those need to picked out and assigned
// to the vmx segment access rights variable...
segment_info.limit = __segmentlimit(segment_selector.flags);
segment_info.limit = __segmentlimit(selector.flags);
segment_info.rights = get_access_rights(segment_descriptor);
// base address of a segment is spread over the segment descriptor in 3 places. 2 parts of the

2
segment_intrin.h
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@ -12,6 +12,6 @@ extern "C" u16 readldt(void);
namespace segment
{
auto get_info(segment_descriptor_register_64 gdt_value, segment_selector segment_selector) -> hv::segment_info_ctx;
auto get_info(const segment_descriptor_register_64& gdt_value, segment_selector segment_selector) -> hv::segment_info_ctx;
auto get_access_rights(segment_descriptor_64* segment_descriptor) -> vmx_segment_access_rights;
}

195
vmcs.cpp
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@ -15,14 +15,14 @@ namespace vmcs
__vmx_vmwrite(VMCS_HOST_CR3, __readcr3());
__vmx_vmwrite(VMCS_HOST_CR4, __readcr4());
DBG_PRINT("host cr0: 0x%p\n", __readcr0());
DBG_PRINT("host cr3: 0x%p\n", __readcr3());
DBG_PRINT("host cr4: 0x%p\n", __readcr4());
// stack growns down...
__vmx_vmwrite(VMCS_HOST_RSP, host_rsp + (PAGE_SIZE * HOST_STACK_PAGES) - 8);
__vmx_vmwrite(VMCS_HOST_RSP, host_rsp + (PAGE_SIZE * HOST_STACK_PAGES) - 0x10);
__vmx_vmwrite(VMCS_HOST_RIP, reinterpret_cast<u64>(host_rip));
__vmx_vmwrite(VMCS_HOST_SYSENTER_CS, __readmsr(IA32_SYSENTER_CS));
__vmx_vmwrite(VMCS_HOST_SYSENTER_EIP, __readmsr(IA32_SYSENTER_EIP));
__vmx_vmwrite(VMCS_HOST_SYSENTER_ESP, __readmsr(IA32_SYSENTER_ESP));
__vmx_vmwrite(VMCS_HOST_GDTR_BASE, gdt_value.base_address);
__vmx_vmwrite(VMCS_HOST_IDTR_BASE, idt_value.base_address);
@ -64,8 +64,8 @@ namespace vmcs
__vmx_vmwrite(VMCS_HOST_SS_SELECTOR, ss.flags);
__vmx_vmwrite(VMCS_HOST_TR_SELECTOR, tr.flags);
// FS base is 0 on windows so no need to read it...
__vmx_vmwrite(VMCS_HOST_GS_BASE, __readmsr(IA32_GS_BASE));
__vmx_vmwrite(VMCS_HOST_FS_BASE, __readmsr(IA32_FS_BASE));
}
auto setup_guest() -> void
@ -80,42 +80,74 @@ namespace vmcs
__vmx_vmwrite(VMCS_GUEST_CR3, __readcr3());
__vmx_vmwrite(VMCS_GUEST_CR4, __readcr4());
__vmx_vmwrite(VMCS_GUEST_VMCS_LINK_POINTER, ~0ULL);
__vmx_vmwrite(VMCS_GUEST_DEBUGCTL, __readmsr(IA32_DEBUGCTL));
__vmx_vmwrite(VMCS_GUEST_DEBUGCTL, __readmsr(IA32_DEBUGCTL));
__vmx_vmwrite(VMCS_GUEST_SYSENTER_CS, __readmsr(IA32_SYSENTER_CS));
__vmx_vmwrite(VMCS_GUEST_SYSENTER_EIP, __readmsr(IA32_SYSENTER_EIP));
__vmx_vmwrite(VMCS_GUEST_SYSENTER_ESP, __readmsr(IA32_SYSENTER_ESP));
DBG_PRINT("guest cr0: 0x%p\n", __readcr0());
DBG_PRINT("guest cr3: 0x%p\n", __readcr3());
DBG_PRINT("guest cr4: 0x%p\n", __readcr4());
__vmx_vmwrite(VMCS_GUEST_VMCS_LINK_POINTER, ~0ULL);
__vmx_vmwrite(VMCS_GUEST_GDTR_BASE, gdt_value.base_address);
__vmx_vmwrite(VMCS_GUEST_GDTR_LIMIT, gdt_value.limit);
DBG_PRINT("guest gdt base address: 0x%p\n", gdt_value.base_address);
DBG_PRINT("guest gdt limit: 0x%x\n", gdt_value.limit);
__vmx_vmwrite(VMCS_GUEST_IDTR_BASE, idt_value.base_address);
__vmx_vmwrite(VMCS_GUEST_IDTR_LIMIT, idt_value.limit);
DBG_PRINT("guest idt base address: 0x%p\n", idt_value.base_address);
DBG_PRINT("guest idt limit: 0x%x\n", idt_value.limit);
__vmx_vmwrite(VMCS_GUEST_RFLAGS, __readeflags());
__vmx_vmwrite(VMCS_GUEST_DR7, __readdr(7));
DBG_PRINT("guest rflags: 0x%p\n", __readeflags());
DBG_PRINT("guest debug register 7: 0x%p\n", __readdr(7));
const auto [es_rights, es_limit, es_base] =
segment::get_info(gdt_value, segment_selector{ reades() });
DBG_PRINT("es selector: 0x%p\n", reades());
DBG_PRINT(" - es.index: %d\n", segment_selector{ reades() }.index);
DBG_PRINT(" - es.request_privilege_level: %d\n", segment_selector{ reades() }.request_privilege_level);
DBG_PRINT(" - es.table: %d\n", segment_selector{ reades() }.table);
DBG_PRINT("es base address: 0x%p\n", es_base);
DBG_PRINT("es limit: 0x%p\n", es_limit);
DBG_PRINT("es rights: 0x%p\n", es_rights.flags);
DBG_PRINT(" - es_rights.available_bit: %d\n", es_rights.available_bit);
DBG_PRINT(" - es_rights.default_big: %d\n", es_rights.default_big);
DBG_PRINT(" - es_rights.descriptor_privilege_level: %d\n", es_rights.descriptor_privilege_level);
DBG_PRINT(" - es_rights.descriptor_type: %d\n", es_rights.descriptor_type);
DBG_PRINT(" - es_rights.granularity: %d\n", es_rights.granularity);
DBG_PRINT(" - es_rights.long_mode: %d\n", es_rights.long_mode);
DBG_PRINT(" - es_rights.present: %d\n", es_rights.present);
DBG_PRINT(" - es_rights.type: %d\n", es_rights.type);
DBG_PRINT(" - es_rights.unusable: %d\n", es_rights.unusable);
__vmx_vmwrite(VMCS_GUEST_ES_BASE, es_base);
__vmx_vmwrite(VMCS_GUEST_ES_LIMIT, es_limit);
__vmx_vmwrite(VMCS_GUEST_ES_SELECTOR, reades());
__vmx_vmwrite(VMCS_GUEST_ES_ACCESS_RIGHTS, es_rights.flags);
const auto [ds_rights, ds_limit, ds_base] =
segment::get_info(gdt_value, segment_selector{ readds() });
__vmx_vmwrite(VMCS_GUEST_DS_BASE, ds_base);
__vmx_vmwrite(VMCS_GUEST_DS_LIMIT, ds_limit);
__vmx_vmwrite(VMCS_GUEST_DS_SELECTOR, readds());
__vmx_vmwrite(VMCS_GUEST_DS_ACCESS_RIGHTS, ds_rights.flags);
const auto [fs_rights, fs_limit, fs_base] =
segment::get_info(gdt_value, segment_selector{ readfs() });
DBG_PRINT("fs selector: 0x%p\n", readfs());
DBG_PRINT(" - fs.index: %d\n", segment_selector{ readfs() }.index);
DBG_PRINT(" - fs.request_privilege_level: %d\n", segment_selector{ readfs() }.request_privilege_level);
DBG_PRINT(" - fs.table: %d\n", segment_selector{ readfs() }.table);
DBG_PRINT("fs base address: 0x%p\n", fs_base);
DBG_PRINT("fs limit: 0x%p\n", fs_limit);
DBG_PRINT("fs rights: 0x%p\n", fs_rights.flags);
DBG_PRINT(" - fs_rights.available_bit: %d\n", fs_rights.available_bit);
DBG_PRINT(" - fs_rights.default_big: %d\n", fs_rights.default_big);
DBG_PRINT(" - fs_rights.descriptor_privilege_level: %d\n", fs_rights.descriptor_privilege_level);
DBG_PRINT(" - fs_rights.descriptor_type: %d\n", fs_rights.descriptor_type);
DBG_PRINT(" - fs_rights.granularity: %d\n", fs_rights.granularity);
DBG_PRINT(" - fs_rights.long_mode: %d\n", fs_rights.long_mode);
DBG_PRINT(" - fs_rights.present: %d\n", fs_rights.present);
DBG_PRINT(" - fs_rights.type: %d\n", fs_rights.type);
DBG_PRINT(" - fs_rights.unusable: %d\n", fs_rights.unusable);
__vmx_vmwrite(VMCS_GUEST_FS_BASE, fs_base);
__vmx_vmwrite(VMCS_GUEST_FS_LIMIT, fs_limit);
__vmx_vmwrite(VMCS_GUEST_FS_SELECTOR, readfs());
@ -124,6 +156,23 @@ namespace vmcs
const auto [gs_rights, gs_limit, gs_base] =
segment::get_info(gdt_value, segment_selector{ readgs() });
DBG_PRINT("gs selector: 0x%p\n", readgs());
DBG_PRINT(" - gs.index: %d\n", segment_selector{ readgs() }.index);
DBG_PRINT(" - gs.request_privilege_level: %d\n", segment_selector{ readgs() }.request_privilege_level);
DBG_PRINT(" - gs.table: %d\n", segment_selector{ readgs() }.table);
DBG_PRINT("gs base address: 0x%p\n", gs_base);
DBG_PRINT("gs limit: 0x%p\n", gs_limit);
DBG_PRINT("gs rights: 0x%p\n", gs_rights.flags);
DBG_PRINT(" - gs_rights.available_bit: %d\n", gs_rights.available_bit);
DBG_PRINT(" - gs_rights.default_big: %d\n", gs_rights.default_big);
DBG_PRINT(" - gs_rights.descriptor_privilege_level: %d\n", gs_rights.descriptor_privilege_level);
DBG_PRINT(" - gs_rights.descriptor_type: %d\n", gs_rights.descriptor_type);
DBG_PRINT(" - gs_rights.granularity: %d\n", gs_rights.granularity);
DBG_PRINT(" - gs_rights.long_mode: %d\n", gs_rights.long_mode);
DBG_PRINT(" - gs_rights.present: %d\n", gs_rights.present);
DBG_PRINT(" - gs_rights.type: %d\n", gs_rights.type);
DBG_PRINT(" - gs_rights.unusable: %d\n", gs_rights.unusable);
__vmx_vmwrite(VMCS_GUEST_GS_BASE, gs_base);
__vmx_vmwrite(VMCS_GUEST_GS_LIMIT, gs_limit);
__vmx_vmwrite(VMCS_GUEST_GS_SELECTOR, readgs());
@ -132,6 +181,23 @@ namespace vmcs
const auto [ss_rights, ss_limit, ss_base] =
segment::get_info(gdt_value, segment_selector{ readss() });
DBG_PRINT("ss selector: 0x%p\n", readss());
DBG_PRINT(" - ss.index: %d\n", segment_selector{ readss() }.index);
DBG_PRINT(" - ss.request_privilege_level: %d\n", segment_selector{ readss() }.request_privilege_level);
DBG_PRINT(" - ss.table: %d\n", segment_selector{ readss() }.table);
DBG_PRINT("ss base address: 0x%p\n", ss_base);
DBG_PRINT("ss limit: 0x%p\n", ss_limit);
DBG_PRINT("ss rights: 0x%p\n", ss_rights.flags);
DBG_PRINT(" - ss_rights.available_bit: %d\n", ss_rights.available_bit);
DBG_PRINT(" - ss_rights.default_big: %d\n", ss_rights.default_big);
DBG_PRINT(" - ss_rights.descriptor_privilege_level: %d\n", ss_rights.descriptor_privilege_level);
DBG_PRINT(" - ss_rights.descriptor_type: %d\n", ss_rights.descriptor_type);
DBG_PRINT(" - ss_rights.granularity: %d\n", ss_rights.granularity);
DBG_PRINT(" - ss_rights.long_mode: %d\n", ss_rights.long_mode);
DBG_PRINT(" - ss_rights.present: %d\n", ss_rights.present);
DBG_PRINT(" - ss_rights.type: %d\n", ss_rights.type);
DBG_PRINT(" - ss_rights.unusable: %d\n", ss_rights.unusable);
__vmx_vmwrite(VMCS_GUEST_SS_BASE, ss_base);
__vmx_vmwrite(VMCS_GUEST_SS_LIMIT, ss_limit);
__vmx_vmwrite(VMCS_GUEST_SS_SELECTOR, readss());
@ -140,14 +206,73 @@ namespace vmcs
const auto [cs_rights, cs_limit, cs_base] =
segment::get_info(gdt_value, segment_selector{ readcs() });
DBG_PRINT("cs selector: 0x%p\n", readcs());
DBG_PRINT(" - cs.index: %d\n", segment_selector{ readcs() }.index);
DBG_PRINT(" - cs.request_privilege_level: %d\n", segment_selector{ readcs() }.request_privilege_level);
DBG_PRINT(" - cs.table: %d\n", segment_selector{ readcs() }.table);
DBG_PRINT("cs base address: 0x%p\n", cs_base);
DBG_PRINT("cs limit: 0x%p\n", cs_limit);
DBG_PRINT("cs rights: 0x%p\n", cs_rights.flags);
DBG_PRINT(" - cs_rights.available_bit: %d\n", cs_rights.available_bit);
DBG_PRINT(" - cs_rights.default_big: %d\n", cs_rights.default_big);
DBG_PRINT(" - cs_rights.descriptor_privilege_level: %d\n", cs_rights.descriptor_privilege_level);
DBG_PRINT(" - cs_rights.descriptor_type: %d\n", cs_rights.descriptor_type);
DBG_PRINT(" - cs_rights.granularity: %d\n", cs_rights.granularity);
DBG_PRINT(" - cs_rights.long_mode: %d\n", cs_rights.long_mode);
DBG_PRINT(" - cs_rights.present: %d\n", cs_rights.present);
DBG_PRINT(" - cs_rights.type: %d\n", cs_rights.type);
DBG_PRINT(" - cs_rights.unusable: %d\n", cs_rights.unusable);
__vmx_vmwrite(VMCS_GUEST_CS_BASE, cs_base);
__vmx_vmwrite(VMCS_GUEST_CS_LIMIT, cs_limit);
__vmx_vmwrite(VMCS_GUEST_CS_SELECTOR, readcs());
__vmx_vmwrite(VMCS_GUEST_CS_ACCESS_RIGHTS, cs_rights.flags);
const auto [ds_rights, ds_limit, ds_base] =
segment::get_info(gdt_value, segment_selector{ readds() });
DBG_PRINT("ds selector: 0x%p\n", readds());
DBG_PRINT(" - ds.index: %d\n", segment_selector{ readds() }.index);
DBG_PRINT(" - ds.request_privilege_level: %d\n", segment_selector{ readds() }.request_privilege_level);
DBG_PRINT(" - ds.table: %d\n", segment_selector{ readds() }.table);
DBG_PRINT("ds base address: 0x%p\n", ds_base);
DBG_PRINT("ds limit: 0x%p\n", ds_limit);
DBG_PRINT("ds rights: 0x%p\n", ds_rights.flags);
DBG_PRINT(" - ds_rights.available_bit: %d\n", ds_rights.available_bit);
DBG_PRINT(" - ds_rights.default_big: %d\n", ds_rights.default_big);
DBG_PRINT(" - ds_rights.descriptor_privilege_level: %d\n", ds_rights.descriptor_privilege_level);
DBG_PRINT(" - ds_rights.descriptor_type: %d\n", ds_rights.descriptor_type);
DBG_PRINT(" - ds_rights.granularity: %d\n", ds_rights.granularity);
DBG_PRINT(" - ds_rights.long_mode: %d\n", ds_rights.long_mode);
DBG_PRINT(" - ds_rights.present: %d\n", ds_rights.present);
DBG_PRINT(" - ds_rights.type: %d\n", ds_rights.type);
DBG_PRINT(" - ds_rights.unusable: %d\n", ds_rights.unusable);
__vmx_vmwrite(VMCS_GUEST_DS_BASE, ds_base);
__vmx_vmwrite(VMCS_GUEST_DS_LIMIT, ds_limit);
__vmx_vmwrite(VMCS_GUEST_DS_SELECTOR, readds());
__vmx_vmwrite(VMCS_GUEST_DS_ACCESS_RIGHTS, ds_rights.flags);
const auto [tr_rights, tr_limit, tr_base] =
segment::get_info(gdt_value, segment_selector{ readtr() });
DBG_PRINT("tr selector: 0x%p\n", readtr());
DBG_PRINT(" - tr.index: %d\n", segment_selector{ readtr() }.index);
DBG_PRINT(" - tr.request_privilege_level: %d\n", segment_selector{ readtr() }.request_privilege_level);
DBG_PRINT(" - tr.table: %d\n", segment_selector{ readtr() }.table);
DBG_PRINT("tr base address: 0x%p\n", tr_base);
DBG_PRINT("tr limit: 0x%p\n", tr_limit);
DBG_PRINT("tr rights: 0x%p\n", tr_rights.flags);
DBG_PRINT(" - tr_rights.available_bit: %d\n", tr_rights.available_bit);
DBG_PRINT(" - tr_rights.default_big: %d\n", tr_rights.default_big);
DBG_PRINT(" - tr_rights.descriptor_privilege_level: %d\n", tr_rights.descriptor_privilege_level);
DBG_PRINT(" - tr_rights.descriptor_type: %d\n", tr_rights.descriptor_type);
DBG_PRINT(" - tr_rights.granularity: %d\n", tr_rights.granularity);
DBG_PRINT(" - tr_rights.long_mode: %d\n", tr_rights.long_mode);
DBG_PRINT(" - tr_rights.present: %d\n", tr_rights.present);
DBG_PRINT(" - tr_rights.type: %d\n", tr_rights.type);
DBG_PRINT(" - tr_rights.unusable: %d\n", tr_rights.unusable);
__vmx_vmwrite(VMCS_GUEST_TR_BASE, tr_base);
__vmx_vmwrite(VMCS_GUEST_TR_LIMIT, tr_limit);
__vmx_vmwrite(VMCS_GUEST_TR_SELECTOR, readtr());
@ -156,13 +281,34 @@ namespace vmcs
const auto [ldt_rights, ldt_limit, ldt_base] =
segment::get_info(gdt_value, segment_selector{ readldt() });
DBG_PRINT("ldt selector: 0x%p\n", readldt());
DBG_PRINT(" - ldt.index: %d\n", segment_selector{ readldt() }.index);
DBG_PRINT(" - ldt.request_privilege_level: %d\n", segment_selector{ readldt() }.request_privilege_level);
DBG_PRINT(" - ldt.table: %d\n", segment_selector{ readldt() }.table);
DBG_PRINT("ldt base address: 0x%p\n", tr_base);
DBG_PRINT("ldt limit: 0x%p\n", tr_limit);
DBG_PRINT("ldt rights: 0x%p\n", tr_rights.flags);
DBG_PRINT(" - ldt_rights.available_bit: %d\n", tr_rights.available_bit);
DBG_PRINT(" - ldt_rights.default_big: %d\n", tr_rights.default_big);
DBG_PRINT(" - ldt_rights.descriptor_privilege_level: %d\n", tr_rights.descriptor_privilege_level);
DBG_PRINT(" - ldt_rights.descriptor_type: %d\n", tr_rights.descriptor_type);
DBG_PRINT(" - ldt_rights.granularity: %d\n", tr_rights.granularity);
DBG_PRINT(" - ldt_rights.long_mode: %d\n", tr_rights.long_mode);
DBG_PRINT(" - ldt_rights.present: %d\n", tr_rights.present);
DBG_PRINT(" - ldt_rights.type: %d\n", tr_rights.type);
DBG_PRINT(" - ldt_rights.unusable: %d\n", tr_rights.unusable);
__vmx_vmwrite(VMCS_GUEST_LDTR_BASE, ldt_base);
__vmx_vmwrite(VMCS_GUEST_LDTR_LIMIT, ldt_limit);
__vmx_vmwrite(VMCS_GUEST_LDTR_SELECTOR, readldt());
__vmx_vmwrite(VMCS_GUEST_LDTR_ACCESS_RIGHTS, ldt_rights.flags);
__vmx_vmwrite(VMCS_GUEST_GS_BASE, __readmsr(IA32_GS_BASE));
__vmx_vmwrite(VMCS_GUEST_FS_BASE, __readmsr(IA32_FS_BASE));
DBG_PRINT("guest gs base (from readmsr): 0x%p\n", __readmsr(IA32_GS_BASE));
__vmx_vmwrite(VMCS_GUEST_ACTIVITY_STATE, 0);
__vmx_vmwrite(VMCS_GUEST_INTERRUPTIBILITY_STATE, 0);
__vmx_vmwrite(VMCS_GUEST_PENDING_DEBUG_EXCEPTIONS, 0);
}
auto setup_controls() -> void
@ -233,6 +379,7 @@ namespace vmcs
msr_fix_value.flags = __readmsr(IA32_VMX_TRUE_ENTRY_CTLS);
entry_ctls.ia32e_mode_guest = true;
entry_ctls.conceal_vmx_from_pt = true;
entry_ctls.flags &= msr_fix_value.allowed_1_settings;
entry_ctls.flags |= msr_fix_value.allowed_0_settings;
__vmx_vmwrite(VMCS_CTRL_VMENTRY_CONTROLS, entry_ctls.flags);
@ -373,8 +520,8 @@ namespace vmcs
msr_fix_value.flags = __readmsr(IA32_VMX_PROCBASED_CTLS2);
procbased_ctls2.enable_rdtscp = true;
procbased_ctls2.enable_xsaves = true; // although my xeons dont support xsave... other cpus do!
procbased_ctls2.conceal_vmx_from_pt = true; // although my xeons dont support processor tracing... other cpus do!
procbased_ctls2.enable_xsaves = true;
procbased_ctls2.conceal_vmx_from_pt = true;
procbased_ctls2.flags &= msr_fix_value.allowed_1_settings;
procbased_ctls2.flags |= msr_fix_value.allowed_0_settings;
__vmx_vmwrite(VMCS_CTRL_SECONDARY_PROCESSOR_BASED_VM_EXECUTION_CONTROLS, procbased_ctls2.flags);

28
vmxexit_handler.asm
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@ -1,8 +1,30 @@
extern exit_handler : proc
.code
vmxlaunch_processor proc
pushfq ; vmlaunch sets some flags if an error happens...
mov rcx, 0681Ch ; VMCS_GUEST_RSP
vmwrite rcx, rsp ; current rsp pointer...
mov rcx, 0681Eh ; VMCS_GUEST_RIP
lea rdx, done ;
vmwrite rcx, rdx ; return C0FFEE on success...
vmlaunch
pushfq ; push rflags to the stack then put it into rax...
pop rax ;
popfq ; restore rflags back to what it was in the c++ code...
ret
done:
popfq ; restore flags and return back to c++ code...
mov rax, 0C0FFEEh
ret
vmxlaunch_processor endp
vmxexit_handler proc
int 3 ; see if vmexit get called...
push rax
push rbx
push rcx
@ -19,7 +41,7 @@ vmxexit_handler proc
push r14
push r15
sub rsp, 0100h ; 16 xmm registers... probably dont need to do all of them...
sub rsp, 0108h ; 16 xmm registers... and +8 bytes for alignment...
movaps [rsp], xmm0
movaps [rsp + 010h], xmm1
movaps [rsp + 020h], xmm2
@ -58,7 +80,7 @@ vmxexit_handler proc
movaps xmm13, [rsp + 0D0h]
movaps xmm14, [rsp + 0E0h]
movaps xmm15, [rsp + 0F0h]
add rsp, 0100h ; 16 xmm registers... probably dont need to do all of them...
add rsp, 0108h ; 16 xmm registers... and +8 bytes for alignment...
pop r15
pop r14

10
vmxlaunch.cpp
Unescape View File

@ -16,14 +16,18 @@ auto vmxlaunch::init_vmcs() -> void
auto vmxlaunch::launch() -> void
{
const auto vmlaunch_result = __vmx_vmlaunch();
const auto vmlaunch_result = vmxlaunch_processor();
DBG_PRINT("vmxlaunch for processor: %d\n", KeGetCurrentProcessorNumber());
DBG_PRINT(" - vmxlaunch result (0 == success): %d\n", vmlaunch_result);
DBG_PRINT(" - vmxlaunch result: 0x%x\n", vmlaunch_result);
if (vmlaunch_result)
if (vmlaunch_result != VMX_LAUNCH_SUCCESS)
{
u64 vmxerror;
rflags flags{ vmlaunch_result };
__vmx_vmread(VMCS_VM_INSTRUCTION_ERROR, &vmxerror);
DBG_PRINT("vmxerror: %d\n", vmxerror);
DBG_PRINT("eflags.zero_flag: %d\n", flags.zero_flag);
DBG_PRINT("eflags.carry_flag: %d\n", flags.carry_flag);
}
}

3
vmxlaunch.hpp
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@ -4,6 +4,9 @@
#include "vmxon.hpp"
#include "vmcs.hpp"
#define VMX_LAUNCH_SUCCESS 0xC0FFEE
extern "C" u32 vmxlaunch_processor(void);
namespace vmxlaunch
{
auto init_vmcs() -> void;

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