diff options
Diffstat (limited to 'arch/x86/kvm/vmx/nested.c')
| -rw-r--r-- | arch/x86/kvm/vmx/nested.c | 112 |
1 files changed, 74 insertions, 38 deletions
diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c index d91c08f04dd5..96ede74a6067 100644 --- a/arch/x86/kvm/vmx/nested.c +++ b/arch/x86/kvm/vmx/nested.c @@ -6756,36 +6756,9 @@ static u64 nested_vmx_calc_vmcs_enum_msr(void) return (u64)max_idx << VMCS_FIELD_INDEX_SHIFT; } -/* - * nested_vmx_setup_ctls_msrs() sets up variables containing the values to be - * returned for the various VMX controls MSRs when nested VMX is enabled. - * The same values should also be used to verify that vmcs12 control fields are - * valid during nested entry from L1 to L2. - * Each of these control msrs has a low and high 32-bit half: A low bit is on - * if the corresponding bit in the (32-bit) control field *must* be on, and a - * bit in the high half is on if the corresponding bit in the control field - * may be on. See also vmx_control_verify(). - */ -void nested_vmx_setup_ctls_msrs(struct vmcs_config *vmcs_conf, u32 ept_caps) +static void nested_vmx_setup_pinbased_ctls(struct vmcs_config *vmcs_conf, + struct nested_vmx_msrs *msrs) { - struct nested_vmx_msrs *msrs = &vmcs_conf->nested; - - /* - * Note that as a general rule, the high half of the MSRs (bits in - * the control fields which may be 1) should be initialized by the - * intersection of the underlying hardware's MSR (i.e., features which - * can be supported) and the list of features we want to expose - - * because they are known to be properly supported in our code. - * Also, usually, the low half of the MSRs (bits which must be 1) can - * be set to 0, meaning that L1 may turn off any of these bits. The - * reason is that if one of these bits is necessary, it will appear - * in vmcs01 and prepare_vmcs02, when it bitwise-or's the control - * fields of vmcs01 and vmcs02, will turn these bits off - and - * nested_vmx_l1_wants_exit() will not pass related exits to L1. - * These rules have exceptions below. - */ - - /* pin-based controls */ msrs->pinbased_ctls_low = PIN_BASED_ALWAYSON_WITHOUT_TRUE_MSR; @@ -6798,8 +6771,11 @@ void nested_vmx_setup_ctls_msrs(struct vmcs_config *vmcs_conf, u32 ept_caps) msrs->pinbased_ctls_high |= PIN_BASED_ALWAYSON_WITHOUT_TRUE_MSR | PIN_BASED_VMX_PREEMPTION_TIMER; +} - /* exit controls */ +static void nested_vmx_setup_exit_ctls(struct vmcs_config *vmcs_conf, + struct nested_vmx_msrs *msrs) +{ msrs->exit_ctls_low = VM_EXIT_ALWAYSON_WITHOUT_TRUE_MSR; @@ -6818,8 +6794,11 @@ void nested_vmx_setup_ctls_msrs(struct vmcs_config *vmcs_conf, u32 ept_caps) /* We support free control of debug control saving. */ msrs->exit_ctls_low &= ~VM_EXIT_SAVE_DEBUG_CONTROLS; +} - /* entry controls */ +static void nested_vmx_setup_entry_ctls(struct vmcs_config *vmcs_conf, + struct nested_vmx_msrs *msrs) +{ msrs->entry_ctls_low = VM_ENTRY_ALWAYSON_WITHOUT_TRUE_MSR; @@ -6835,8 +6814,11 @@ void nested_vmx_setup_ctls_msrs(struct vmcs_config *vmcs_conf, u32 ept_caps) /* We support free control of debug control loading. */ msrs->entry_ctls_low &= ~VM_ENTRY_LOAD_DEBUG_CONTROLS; +} - /* cpu-based controls */ +static void nested_vmx_setup_cpubased_ctls(struct vmcs_config *vmcs_conf, + struct nested_vmx_msrs *msrs) +{ msrs->procbased_ctls_low = CPU_BASED_ALWAYSON_WITHOUT_TRUE_MSR; @@ -6868,12 +6850,12 @@ void nested_vmx_setup_ctls_msrs(struct vmcs_config *vmcs_conf, u32 ept_caps) /* We support free control of CR3 access interception. */ msrs->procbased_ctls_low &= ~(CPU_BASED_CR3_LOAD_EXITING | CPU_BASED_CR3_STORE_EXITING); +} - /* - * secondary cpu-based controls. Do not include those that - * depend on CPUID bits, they are added later by - * vmx_vcpu_after_set_cpuid. - */ +static void nested_vmx_setup_secondary_ctls(u32 ept_caps, + struct vmcs_config *vmcs_conf, + struct nested_vmx_msrs *msrs) +{ msrs->secondary_ctls_low = 0; msrs->secondary_ctls_high = vmcs_conf->cpu_based_2nd_exec_ctrl; @@ -6951,8 +6933,11 @@ void nested_vmx_setup_ctls_msrs(struct vmcs_config *vmcs_conf, u32 ept_caps) if (enable_sgx) msrs->secondary_ctls_high |= SECONDARY_EXEC_ENCLS_EXITING; +} - /* miscellaneous data */ +static void nested_vmx_setup_misc_data(struct vmcs_config *vmcs_conf, + struct nested_vmx_msrs *msrs) +{ msrs->misc_low = (u32)vmcs_conf->misc & VMX_MISC_SAVE_EFER_LMA; msrs->misc_low |= MSR_IA32_VMX_MISC_VMWRITE_SHADOW_RO_FIELDS | @@ -6960,7 +6945,10 @@ void nested_vmx_setup_ctls_msrs(struct vmcs_config *vmcs_conf, u32 ept_caps) VMX_MISC_ACTIVITY_HLT | VMX_MISC_ACTIVITY_WAIT_SIPI; msrs->misc_high = 0; +} +static void nested_vmx_setup_basic(struct nested_vmx_msrs *msrs) +{ /* * This MSR reports some information about VMX support. We * should return information about the VMX we emulate for the @@ -6975,7 +6963,10 @@ void nested_vmx_setup_ctls_msrs(struct vmcs_config *vmcs_conf, u32 ept_caps) if (cpu_has_vmx_basic_inout()) msrs->basic |= VMX_BASIC_INOUT; +} +static void nested_vmx_setup_cr_fixed(struct nested_vmx_msrs *msrs) +{ /* * These MSRs specify bits which the guest must keep fixed on * while L1 is in VMXON mode (in L1's root mode, or running an L2). @@ -6992,6 +6983,51 @@ void nested_vmx_setup_ctls_msrs(struct vmcs_config *vmcs_conf, u32 ept_caps) if (vmx_umip_emulated()) msrs->cr4_fixed1 |= X86_CR4_UMIP; +} + +/* + * nested_vmx_setup_ctls_msrs() sets up variables containing the values to be + * returned for the various VMX controls MSRs when nested VMX is enabled. + * The same values should also be used to verify that vmcs12 control fields are + * valid during nested entry from L1 to L2. + * Each of these control msrs has a low and high 32-bit half: A low bit is on + * if the corresponding bit in the (32-bit) control field *must* be on, and a + * bit in the high half is on if the corresponding bit in the control field + * may be on. See also vmx_control_verify(). + */ +void nested_vmx_setup_ctls_msrs(struct vmcs_config *vmcs_conf, u32 ept_caps) +{ + struct nested_vmx_msrs *msrs = &vmcs_conf->nested; + + /* + * Note that as a general rule, the high half of the MSRs (bits in + * the control fields which may be 1) should be initialized by the + * intersection of the underlying hardware's MSR (i.e., features which + * can be supported) and the list of features we want to expose - + * because they are known to be properly supported in our code. + * Also, usually, the low half of the MSRs (bits which must be 1) can + * be set to 0, meaning that L1 may turn off any of these bits. The + * reason is that if one of these bits is necessary, it will appear + * in vmcs01 and prepare_vmcs02, when it bitwise-or's the control + * fields of vmcs01 and vmcs02, will turn these bits off - and + * nested_vmx_l1_wants_exit() will not pass related exits to L1. + * These rules have exceptions below. + */ + nested_vmx_setup_pinbased_ctls(vmcs_conf, msrs); + + nested_vmx_setup_exit_ctls(vmcs_conf, msrs); + + nested_vmx_setup_entry_ctls(vmcs_conf, msrs); + + nested_vmx_setup_cpubased_ctls(vmcs_conf, msrs); + + nested_vmx_setup_secondary_ctls(ept_caps, vmcs_conf, msrs); + + nested_vmx_setup_misc_data(vmcs_conf, msrs); + + nested_vmx_setup_basic(msrs); + + nested_vmx_setup_cr_fixed(msrs); msrs->vmcs_enum = nested_vmx_calc_vmcs_enum_msr(); } |