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KVM: VMX: Extend VMX controls macro shenanigans
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When VMX controls macros are used to set or clear a control bit, make
sure that this bit was checked in setup_vmcs_config() and thus is properly
reflected in vmcs_config.

Opportunistically drop pointless "< 0" check for adjust_vmx_controls()'s
return value.

No functional change intended.

Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Link: https://lore.kernel.org/r/20220830133737.1539624-24-vkuznets@redhat.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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Vitaly Kuznetsov authored and Paolo Bonzini committed Sep 26, 2022
1 parent ebb3c8d commit ee087b4
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Showing 2 changed files with 157 additions and 112 deletions.
114 changes: 25 additions & 89 deletions arch/x86/kvm/vmx/vmx.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -864,7 +864,7 @@ unsigned int __vmx_vcpu_run_flags(struct vcpu_vmx *vmx)
return flags;
}

static void clear_atomic_switch_msr_special(struct vcpu_vmx *vmx,
static __always_inline void clear_atomic_switch_msr_special(struct vcpu_vmx *vmx,
unsigned long entry, unsigned long exit)
{
vm_entry_controls_clearbit(vmx, entry);
Expand Down Expand Up @@ -922,7 +922,7 @@ static void clear_atomic_switch_msr(struct vcpu_vmx *vmx, unsigned msr)
vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, m->host.nr);
}

static void add_atomic_switch_msr_special(struct vcpu_vmx *vmx,
static __always_inline void add_atomic_switch_msr_special(struct vcpu_vmx *vmx,
unsigned long entry, unsigned long exit,
unsigned long guest_val_vmcs, unsigned long host_val_vmcs,
u64 guest_val, u64 host_val)
Expand Down Expand Up @@ -2525,7 +2525,6 @@ static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf,
struct vmx_capability *vmx_cap)
{
u32 vmx_msr_low, vmx_msr_high;
u32 min, opt, min2, opt2;
u32 _pin_based_exec_control = 0;
u32 _cpu_based_exec_control = 0;
u32 _cpu_based_2nd_exec_control = 0;
Expand All @@ -2551,66 +2550,22 @@ static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf,
};

memset(vmcs_conf, 0, sizeof(*vmcs_conf));
min = CPU_BASED_HLT_EXITING |
#ifdef CONFIG_X86_64
CPU_BASED_CR8_LOAD_EXITING |
CPU_BASED_CR8_STORE_EXITING |
#endif
CPU_BASED_CR3_LOAD_EXITING |
CPU_BASED_CR3_STORE_EXITING |
CPU_BASED_UNCOND_IO_EXITING |
CPU_BASED_MOV_DR_EXITING |
CPU_BASED_USE_TSC_OFFSETTING |
CPU_BASED_MWAIT_EXITING |
CPU_BASED_MONITOR_EXITING |
CPU_BASED_INVLPG_EXITING |
CPU_BASED_RDPMC_EXITING |
CPU_BASED_INTR_WINDOW_EXITING;

opt = CPU_BASED_TPR_SHADOW |
CPU_BASED_USE_MSR_BITMAPS |
CPU_BASED_NMI_WINDOW_EXITING |
CPU_BASED_ACTIVATE_SECONDARY_CONTROLS |
CPU_BASED_ACTIVATE_TERTIARY_CONTROLS;
if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PROCBASED_CTLS,
&_cpu_based_exec_control) < 0)

if (adjust_vmx_controls(KVM_REQUIRED_VMX_CPU_BASED_VM_EXEC_CONTROL,
KVM_OPTIONAL_VMX_CPU_BASED_VM_EXEC_CONTROL,
MSR_IA32_VMX_PROCBASED_CTLS,
&_cpu_based_exec_control))
return -EIO;
#ifdef CONFIG_X86_64
if (_cpu_based_exec_control & CPU_BASED_TPR_SHADOW)
_cpu_based_exec_control &= ~CPU_BASED_CR8_LOAD_EXITING &
~CPU_BASED_CR8_STORE_EXITING;
#endif
if (_cpu_based_exec_control & CPU_BASED_ACTIVATE_SECONDARY_CONTROLS) {
min2 = 0;
opt2 = SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES |
SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE |
SECONDARY_EXEC_WBINVD_EXITING |
SECONDARY_EXEC_ENABLE_VPID |
SECONDARY_EXEC_ENABLE_EPT |
SECONDARY_EXEC_UNRESTRICTED_GUEST |
SECONDARY_EXEC_PAUSE_LOOP_EXITING |
SECONDARY_EXEC_DESC |
SECONDARY_EXEC_ENABLE_RDTSCP |
SECONDARY_EXEC_ENABLE_INVPCID |
SECONDARY_EXEC_APIC_REGISTER_VIRT |
SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY |
SECONDARY_EXEC_SHADOW_VMCS |
SECONDARY_EXEC_XSAVES |
SECONDARY_EXEC_RDSEED_EXITING |
SECONDARY_EXEC_RDRAND_EXITING |
SECONDARY_EXEC_ENABLE_PML |
SECONDARY_EXEC_TSC_SCALING |
SECONDARY_EXEC_ENABLE_USR_WAIT_PAUSE |
SECONDARY_EXEC_PT_USE_GPA |
SECONDARY_EXEC_PT_CONCEAL_VMX |
SECONDARY_EXEC_ENABLE_VMFUNC |
SECONDARY_EXEC_BUS_LOCK_DETECTION |
SECONDARY_EXEC_NOTIFY_VM_EXITING |
SECONDARY_EXEC_ENCLS_EXITING;

if (adjust_vmx_controls(min2, opt2,
if (adjust_vmx_controls(KVM_REQUIRED_VMX_SECONDARY_VM_EXEC_CONTROL,
KVM_OPTIONAL_VMX_SECONDARY_VM_EXEC_CONTROL,
MSR_IA32_VMX_PROCBASED_CTLS2,
&_cpu_based_2nd_exec_control) < 0)
&_cpu_based_2nd_exec_control))
return -EIO;
}
#ifndef CONFIG_X86_64
Expand Down Expand Up @@ -2657,32 +2612,21 @@ static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf,
if (!cpu_has_sgx())
_cpu_based_2nd_exec_control &= ~SECONDARY_EXEC_ENCLS_EXITING;

if (_cpu_based_exec_control & CPU_BASED_ACTIVATE_TERTIARY_CONTROLS) {
u64 opt3 = TERTIARY_EXEC_IPI_VIRT;

_cpu_based_3rd_exec_control = adjust_vmx_controls64(opt3,
if (_cpu_based_exec_control & CPU_BASED_ACTIVATE_TERTIARY_CONTROLS)
_cpu_based_3rd_exec_control =
adjust_vmx_controls64(KVM_OPTIONAL_VMX_TERTIARY_VM_EXEC_CONTROL,
MSR_IA32_VMX_PROCBASED_CTLS3);
}

min = VM_EXIT_SAVE_DEBUG_CONTROLS | VM_EXIT_ACK_INTR_ON_EXIT;
#ifdef CONFIG_X86_64
min |= VM_EXIT_HOST_ADDR_SPACE_SIZE;
#endif
opt = VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL |
VM_EXIT_LOAD_IA32_PAT |
VM_EXIT_LOAD_IA32_EFER |
VM_EXIT_CLEAR_BNDCFGS |
VM_EXIT_PT_CONCEAL_PIP |
VM_EXIT_CLEAR_IA32_RTIT_CTL;
if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_EXIT_CTLS,
&_vmexit_control) < 0)
if (adjust_vmx_controls(KVM_REQUIRED_VMX_VM_EXIT_CONTROLS,
KVM_OPTIONAL_VMX_VM_EXIT_CONTROLS,
MSR_IA32_VMX_EXIT_CTLS,
&_vmexit_control))
return -EIO;

min = PIN_BASED_EXT_INTR_MASK | PIN_BASED_NMI_EXITING;
opt = PIN_BASED_VIRTUAL_NMIS | PIN_BASED_POSTED_INTR |
PIN_BASED_VMX_PREEMPTION_TIMER;
if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PINBASED_CTLS,
&_pin_based_exec_control) < 0)
if (adjust_vmx_controls(KVM_REQUIRED_VMX_PIN_BASED_VM_EXEC_CONTROL,
KVM_OPTIONAL_VMX_PIN_BASED_VM_EXEC_CONTROL,
MSR_IA32_VMX_PINBASED_CTLS,
&_pin_based_exec_control))
return -EIO;

if (cpu_has_broken_vmx_preemption_timer())
Expand All @@ -2691,18 +2635,10 @@ static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf,
SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY))
_pin_based_exec_control &= ~PIN_BASED_POSTED_INTR;

min = VM_ENTRY_LOAD_DEBUG_CONTROLS;
#ifdef CONFIG_X86_64
min |= VM_ENTRY_IA32E_MODE;
#endif
opt = VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL |
VM_ENTRY_LOAD_IA32_PAT |
VM_ENTRY_LOAD_IA32_EFER |
VM_ENTRY_LOAD_BNDCFGS |
VM_ENTRY_PT_CONCEAL_PIP |
VM_ENTRY_LOAD_IA32_RTIT_CTL;
if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_ENTRY_CTLS,
&_vmentry_control) < 0)
if (adjust_vmx_controls(KVM_REQUIRED_VMX_VM_ENTRY_CONTROLS,
KVM_OPTIONAL_VMX_VM_ENTRY_CONTROLS,
MSR_IA32_VMX_ENTRY_CTLS,
&_vmentry_control))
return -EIO;

for (i = 0; i < ARRAY_SIZE(vmcs_entry_exit_pairs); i++) {
Expand Down
155 changes: 132 additions & 23 deletions arch/x86/kvm/vmx/vmx.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -477,29 +477,138 @@ static inline u8 vmx_get_rvi(void)
return vmcs_read16(GUEST_INTR_STATUS) & 0xff;
}

#define BUILD_CONTROLS_SHADOW(lname, uname, bits) \
static inline void lname##_controls_set(struct vcpu_vmx *vmx, u##bits val) \
{ \
if (vmx->loaded_vmcs->controls_shadow.lname != val) { \
vmcs_write##bits(uname, val); \
vmx->loaded_vmcs->controls_shadow.lname = val; \
} \
} \
static inline u##bits __##lname##_controls_get(struct loaded_vmcs *vmcs) \
{ \
return vmcs->controls_shadow.lname; \
} \
static inline u##bits lname##_controls_get(struct vcpu_vmx *vmx) \
{ \
return __##lname##_controls_get(vmx->loaded_vmcs); \
} \
static inline void lname##_controls_setbit(struct vcpu_vmx *vmx, u##bits val) \
{ \
lname##_controls_set(vmx, lname##_controls_get(vmx) | val); \
} \
static inline void lname##_controls_clearbit(struct vcpu_vmx *vmx, u##bits val) \
{ \
lname##_controls_set(vmx, lname##_controls_get(vmx) & ~val); \
#define __KVM_REQUIRED_VMX_VM_ENTRY_CONTROLS \
(VM_ENTRY_LOAD_DEBUG_CONTROLS)
#ifdef CONFIG_X86_64
#define KVM_REQUIRED_VMX_VM_ENTRY_CONTROLS \
(__KVM_REQUIRED_VMX_VM_ENTRY_CONTROLS | \
VM_ENTRY_IA32E_MODE)
#else
#define KVM_REQUIRED_VMX_VM_ENTRY_CONTROLS \
__KVM_REQUIRED_VMX_VM_ENTRY_CONTROLS
#endif
#define KVM_OPTIONAL_VMX_VM_ENTRY_CONTROLS \
(VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL | \
VM_ENTRY_LOAD_IA32_PAT | \
VM_ENTRY_LOAD_IA32_EFER | \
VM_ENTRY_LOAD_BNDCFGS | \
VM_ENTRY_PT_CONCEAL_PIP | \
VM_ENTRY_LOAD_IA32_RTIT_CTL)

#define __KVM_REQUIRED_VMX_VM_EXIT_CONTROLS \
(VM_EXIT_SAVE_DEBUG_CONTROLS | \
VM_EXIT_ACK_INTR_ON_EXIT)
#ifdef CONFIG_X86_64
#define KVM_REQUIRED_VMX_VM_EXIT_CONTROLS \
(__KVM_REQUIRED_VMX_VM_EXIT_CONTROLS | \
VM_EXIT_HOST_ADDR_SPACE_SIZE)
#else
#define KVM_REQUIRED_VMX_VM_EXIT_CONTROLS \
__KVM_REQUIRED_VMX_VM_EXIT_CONTROLS
#endif
#define KVM_OPTIONAL_VMX_VM_EXIT_CONTROLS \
(VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL | \
VM_EXIT_LOAD_IA32_PAT | \
VM_EXIT_LOAD_IA32_EFER | \
VM_EXIT_CLEAR_BNDCFGS | \
VM_EXIT_PT_CONCEAL_PIP | \
VM_EXIT_CLEAR_IA32_RTIT_CTL)

#define KVM_REQUIRED_VMX_PIN_BASED_VM_EXEC_CONTROL \
(PIN_BASED_EXT_INTR_MASK | \
PIN_BASED_NMI_EXITING)
#define KVM_OPTIONAL_VMX_PIN_BASED_VM_EXEC_CONTROL \
(PIN_BASED_VIRTUAL_NMIS | \
PIN_BASED_POSTED_INTR | \
PIN_BASED_VMX_PREEMPTION_TIMER)

#define __KVM_REQUIRED_VMX_CPU_BASED_VM_EXEC_CONTROL \
(CPU_BASED_HLT_EXITING | \
CPU_BASED_CR3_LOAD_EXITING | \
CPU_BASED_CR3_STORE_EXITING | \
CPU_BASED_UNCOND_IO_EXITING | \
CPU_BASED_MOV_DR_EXITING | \
CPU_BASED_USE_TSC_OFFSETTING | \
CPU_BASED_MWAIT_EXITING | \
CPU_BASED_MONITOR_EXITING | \
CPU_BASED_INVLPG_EXITING | \
CPU_BASED_RDPMC_EXITING | \
CPU_BASED_INTR_WINDOW_EXITING)

#ifdef CONFIG_X86_64
#define KVM_REQUIRED_VMX_CPU_BASED_VM_EXEC_CONTROL \
(__KVM_REQUIRED_VMX_CPU_BASED_VM_EXEC_CONTROL | \
CPU_BASED_CR8_LOAD_EXITING | \
CPU_BASED_CR8_STORE_EXITING)
#else
#define KVM_REQUIRED_VMX_CPU_BASED_VM_EXEC_CONTROL \
__KVM_REQUIRED_VMX_CPU_BASED_VM_EXEC_CONTROL
#endif

#define KVM_OPTIONAL_VMX_CPU_BASED_VM_EXEC_CONTROL \
(CPU_BASED_TPR_SHADOW | \
CPU_BASED_USE_MSR_BITMAPS | \
CPU_BASED_NMI_WINDOW_EXITING | \
CPU_BASED_ACTIVATE_SECONDARY_CONTROLS | \
CPU_BASED_ACTIVATE_TERTIARY_CONTROLS)

#define KVM_REQUIRED_VMX_SECONDARY_VM_EXEC_CONTROL 0
#define KVM_OPTIONAL_VMX_SECONDARY_VM_EXEC_CONTROL \
(SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES | \
SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE | \
SECONDARY_EXEC_WBINVD_EXITING | \
SECONDARY_EXEC_ENABLE_VPID | \
SECONDARY_EXEC_ENABLE_EPT | \
SECONDARY_EXEC_UNRESTRICTED_GUEST | \
SECONDARY_EXEC_PAUSE_LOOP_EXITING | \
SECONDARY_EXEC_DESC | \
SECONDARY_EXEC_ENABLE_RDTSCP | \
SECONDARY_EXEC_ENABLE_INVPCID | \
SECONDARY_EXEC_APIC_REGISTER_VIRT | \
SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY | \
SECONDARY_EXEC_SHADOW_VMCS | \
SECONDARY_EXEC_XSAVES | \
SECONDARY_EXEC_RDSEED_EXITING | \
SECONDARY_EXEC_RDRAND_EXITING | \
SECONDARY_EXEC_ENABLE_PML | \
SECONDARY_EXEC_TSC_SCALING | \
SECONDARY_EXEC_ENABLE_USR_WAIT_PAUSE | \
SECONDARY_EXEC_PT_USE_GPA | \
SECONDARY_EXEC_PT_CONCEAL_VMX | \
SECONDARY_EXEC_ENABLE_VMFUNC | \
SECONDARY_EXEC_BUS_LOCK_DETECTION | \
SECONDARY_EXEC_NOTIFY_VM_EXITING | \
SECONDARY_EXEC_ENCLS_EXITING)

#define KVM_REQUIRED_VMX_TERTIARY_VM_EXEC_CONTROL 0
#define KVM_OPTIONAL_VMX_TERTIARY_VM_EXEC_CONTROL \
(TERTIARY_EXEC_IPI_VIRT)

#define BUILD_CONTROLS_SHADOW(lname, uname, bits) \
static inline void lname##_controls_set(struct vcpu_vmx *vmx, u##bits val) \
{ \
if (vmx->loaded_vmcs->controls_shadow.lname != val) { \
vmcs_write##bits(uname, val); \
vmx->loaded_vmcs->controls_shadow.lname = val; \
} \
} \
static inline u##bits __##lname##_controls_get(struct loaded_vmcs *vmcs) \
{ \
return vmcs->controls_shadow.lname; \
} \
static inline u##bits lname##_controls_get(struct vcpu_vmx *vmx) \
{ \
return __##lname##_controls_get(vmx->loaded_vmcs); \
} \
static __always_inline void lname##_controls_setbit(struct vcpu_vmx *vmx, u##bits val) \
{ \
BUILD_BUG_ON(!(val & (KVM_REQUIRED_VMX_##uname | KVM_OPTIONAL_VMX_##uname))); \
lname##_controls_set(vmx, lname##_controls_get(vmx) | val); \
} \
static __always_inline void lname##_controls_clearbit(struct vcpu_vmx *vmx, u##bits val) \
{ \
BUILD_BUG_ON(!(val & (KVM_REQUIRED_VMX_##uname | KVM_OPTIONAL_VMX_##uname))); \
lname##_controls_set(vmx, lname##_controls_get(vmx) & ~val); \
}
BUILD_CONTROLS_SHADOW(vm_entry, VM_ENTRY_CONTROLS, 32)
BUILD_CONTROLS_SHADOW(vm_exit, VM_EXIT_CONTROLS, 32)
Expand Down

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