[PATCH v3 2/2] KVM: VMX: Cleanup VMX misc information defines and usages

Xin Li (Intel)
2023-10-30T23:41:03Z

From: Xin Li <xin3.li@intel.com>

Define VMX misc information fields with BIT_ULL()/GENMASK_ULL(), and move
VMX misc field macros to vmx.h if used in multiple files or where they are
used only once.

Signed-off-by: Xin Li <xin3.li@intel.com>
---
arch/x86/include/asm/msr-index.h | 4 ----
arch/x86/include/asm/vmx.h | 12 +++++------
arch/x86/kvm/vmx/capabilities.h | 4 ++--
arch/x86/kvm/vmx/nested.c | 34 ++++++++++++++++++++++++--------
arch/x86/kvm/vmx/nested.h | 2 +-
arch/x86/kvm/vmx/vmx.c | 8 +++-----
6 files changed, 37 insertions(+), 27 deletions(-)

diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
index d83195f53e33..181366f1512c 100644
--- a/arch/x86/include/asm/msr-index.h
+++ b/arch/x86/include/asm/msr-index.h
@@ -1100,10 +1100,6 @@
#define MSR_IA32_SMBA_BW_BASE 0xc0000280
#define MSR_IA32_EVT_CFG_BASE 0xc0000400

-/* MSR_IA32_VMX_MISC bits */
-#define MSR_IA32_VMX_MISC_INTEL_PT (1ULL << 14)
-#define MSR_IA32_VMX_MISC_VMWRITE_SHADOW_RO_FIELDS (1ULL << 29)
-#define MSR_IA32_VMX_MISC_PREEMPTION_TIMER_SCALE 0x1F
/* AMD-V MSRs */

#define MSR_VM_CR 0xc0010114
diff --git a/arch/x86/include/asm/vmx.h b/arch/x86/include/asm/vmx.h
index 088b75d97c38..433ba0089055 100644
--- a/arch/x86/include/asm/vmx.h
+++ b/arch/x86/include/asm/vmx.h
@@ -128,12 +128,10 @@
#define VMX_BASIC_32BIT_PHYS_ADDR_ONLY BIT_ULL(48)
#define VMX_BASIC_INOUT BIT_ULL(54)

-#define VMX_MISC_PREEMPTION_TIMER_RATE_MASK 0x0000001f
-#define VMX_MISC_SAVE_EFER_LMA 0x00000020
-#define VMX_MISC_ACTIVITY_HLT 0x00000040
-#define VMX_MISC_ACTIVITY_WAIT_SIPI 0x00000100
-#define VMX_MISC_ZERO_LEN_INS 0x40000000
-#define VMX_MISC_MSR_LIST_MULTIPLIER 512
+/* VMX_MISC bits and bitmasks */
+#define VMX_MISC_INTEL_PT BIT_ULL(14)
+#define VMX_MISC_VMWRITE_SHADOW_RO_FIELDS BIT_ULL(29)
+#define VMX_MISC_ZERO_LEN_INS BIT_ULL(30)

/* VMFUNC functions */
#define VMFUNC_CONTROL_BIT(x) BIT((VMX_FEATURE_##x & 0x1f) - 28)
@@ -163,7 +161,7 @@ static inline u32 vmx_basic_vmcs_mem_type(u64 vmx_basic)

static inline int vmx_misc_preemption_timer_rate(u64 vmx_misc)
{
- return vmx_misc & VMX_MISC_PREEMPTION_TIMER_RATE_MASK;
+ return vmx_misc & GENMASK_ULL(4, 0);
}

static inline int vmx_misc_cr3_count(u64 vmx_misc)
diff --git a/arch/x86/kvm/vmx/capabilities.h b/arch/x86/kvm/vmx/capabilities.h
index 86ce8bb96bed..cb6588238f46 100644
--- a/arch/x86/kvm/vmx/capabilities.h
+++ b/arch/x86/kvm/vmx/capabilities.h
@@ -223,7 +223,7 @@ static inline bool cpu_has_vmx_vmfunc(void)
static inline bool cpu_has_vmx_shadow_vmcs(void)
{
/* check if the cpu supports writing r/o exit information fields */
- if (!(vmcs_config.misc & MSR_IA32_VMX_MISC_VMWRITE_SHADOW_RO_FIELDS))
+ if (!(vmcs_config.misc & VMX_MISC_VMWRITE_SHADOW_RO_FIELDS))
return false;

return vmcs_config.cpu_based_2nd_exec_ctrl &
@@ -365,7 +365,7 @@ static inline bool cpu_has_vmx_invvpid_global(void)

static inline bool cpu_has_vmx_intel_pt(void)
{
- return (vmcs_config.misc & MSR_IA32_VMX_MISC_INTEL_PT) &&
+ return (vmcs_config.misc & VMX_MISC_INTEL_PT) &&
(vmcs_config.cpu_based_2nd_exec_ctrl & SECONDARY_EXEC_PT_USE_GPA) &&
(vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_RTIT_CTL);
}
diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index 23704f8d9035..ff07d6e736a2 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -886,6 +886,8 @@ static int nested_vmx_store_msr_check(struct kvm_vcpu *vcpu,
return 0;
}

+#define VMX_MISC_MSR_LIST_MULTIPLIER 512
+
static u32 nested_vmx_max_atomic_switch_msrs(struct kvm_vcpu *vcpu)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
@@ -1295,18 +1297,34 @@ vmx_restore_control_msr(struct vcpu_vmx *vmx, u32 msr_index, u64 data)
return 0;
}

+#define VMX_MISC_SAVE_EFER_LMA BIT_ULL(5)
+#define VMX_MISC_ACTIVITY_STATE_BITMAP GENMASK_ULL(8, 6)
+#define VMX_MISC_ACTIVITY_HLT BIT_ULL(6)
+#define VMX_MISC_ACTIVITY_WAIT_SIPI BIT_ULL(8)
+#define VMX_MISC_RDMSR_IN_SMM BIT_ULL(15)
+#define VMX_MISC_VMXOFF_BLOCK_SMI BIT_ULL(28)
+
+#define VMX_MISC_FEATURES_MASK \
+ (VMX_MISC_SAVE_EFER_LMA | \
+ VMX_MISC_ACTIVITY_STATE_BITMAP | \
+ VMX_MISC_INTEL_PT | \
+ VMX_MISC_RDMSR_IN_SMM | \
+ VMX_MISC_VMXOFF_BLOCK_SMI | \
+ VMX_MISC_VMWRITE_SHADOW_RO_FIELDS | \
+ VMX_MISC_ZERO_LEN_INS)
+
+#define VMX_MISC_RESERVED_BITS \
+ (BIT_ULL(31) | GENMASK_ULL(13, 9))
+
static int vmx_restore_vmx_misc(struct vcpu_vmx *vmx, u64 data)
{
- const u64 feature_and_reserved_bits =
- /* feature */
- BIT_ULL(5) | GENMASK_ULL(8, 6) | BIT_ULL(14) | BIT_ULL(15) |
- BIT_ULL(28) | BIT_ULL(29) | BIT_ULL(30) |
- /* reserved */
- GENMASK_ULL(13, 9) | BIT_ULL(31);
u64 vmx_misc = vmx_control_msr(vmcs_config.nested.misc_low,
vmcs_config.nested.misc_high);

- if (!is_bitwise_subset(vmx_misc, data, feature_and_reserved_bits))
+ static_assert(!(VMX_MISC_FEATURES_MASK & VMX_MISC_RESERVED_BITS));
+
+ if (!is_bitwise_subset(vmx_misc, data,
+ VMX_MISC_FEATURES_MASK | VMX_MISC_RESERVED_BITS))
return -EINVAL;

if ((vmx->nested.msrs.pinbased_ctls_high &
@@ -6956,7 +6974,7 @@ static void nested_vmx_setup_misc_data(struct vmcs_config *vmcs_conf,
{
msrs->misc_low = (u32)vmcs_conf->misc & VMX_MISC_SAVE_EFER_LMA;
msrs->misc_low |=
- MSR_IA32_VMX_MISC_VMWRITE_SHADOW_RO_FIELDS |
+ VMX_MISC_VMWRITE_SHADOW_RO_FIELDS |
VMX_MISC_EMULATED_PREEMPTION_TIMER_RATE |
VMX_MISC_ACTIVITY_HLT |
VMX_MISC_ACTIVITY_WAIT_SIPI;
diff --git a/arch/x86/kvm/vmx/nested.h b/arch/x86/kvm/vmx/nested.h
index b4b9d51438c6..24ff4df509b6 100644
--- a/arch/x86/kvm/vmx/nested.h
+++ b/arch/x86/kvm/vmx/nested.h
@@ -108,7 +108,7 @@ static inline unsigned nested_cpu_vmx_misc_cr3_count(struct kvm_vcpu *vcpu)
static inline bool nested_cpu_has_vmwrite_any_field(struct kvm_vcpu *vcpu)
{
return to_vmx(vcpu)->nested.msrs.misc_low &
- MSR_IA32_VMX_MISC_VMWRITE_SHADOW_RO_FIELDS;
+ VMX_MISC_VMWRITE_SHADOW_RO_FIELDS;
}

static inline bool nested_cpu_has_zero_length_injection(struct kvm_vcpu *vcpu)
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 9caed798d070..213bc238834a 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -2575,7 +2575,6 @@ static int setup_vmcs_config(struct vmcs_config *vmcs_conf,
u32 _vmexit_control = 0;
u32 _vmentry_control = 0;
u64 basic_msr;
- u64 misc_msr;
int i;

/*
@@ -2709,8 +2708,6 @@ static int setup_vmcs_config(struct vmcs_config *vmcs_conf,
if (vmx_basic_vmcs_mem_type(basic_msr) != MEM_TYPE_WB)
return -EIO;

- rdmsrl(MSR_IA32_VMX_MISC, misc_msr);
-
vmcs_conf->basic = basic_msr;
vmcs_conf->pin_based_exec_ctrl = _pin_based_exec_control;
vmcs_conf->cpu_based_exec_ctrl = _cpu_based_exec_control;
@@ -2718,7 +2715,8 @@ static int setup_vmcs_config(struct vmcs_config *vmcs_conf,
vmcs_conf->cpu_based_3rd_exec_ctrl = _cpu_based_3rd_exec_control;
vmcs_conf->vmexit_ctrl = _vmexit_control;
vmcs_conf->vmentry_ctrl = _vmentry_control;
- vmcs_conf->misc = misc_msr;
+
+ rdmsrl(MSR_IA32_VMX_MISC, vmcs_conf->misc);

#if IS_ENABLED(CONFIG_HYPERV)
if (enlightened_vmcs)
@@ -8549,7 +8547,7 @@ static __init int hardware_setup(void)
u64 use_timer_freq = 5000ULL * 1000 * 1000;

cpu_preemption_timer_multi =
- vmcs_config.misc & VMX_MISC_PREEMPTION_TIMER_RATE_MASK;
+ vmx_misc_preemption_timer_rate(vmcs_config.misc);

if (tsc_khz)
use_timer_freq = (u64)tsc_khz * 1000;
--
2.41.0