chore(vmm): Remove unused bitflags

Bitflags for IA32_ARCH_CAPABILITIES MSR are not used anywhere.

Signed-off-by: Takahiro Itazuri <[email protected]>

Author: zulinx86

src/vmm/src/arch/x86_64/msr.rs

@@ -2,7 +2,6 @@
 // SPDX-License-Identifier: Apache-2.0
 
 /// Model Specific Registers (MSRs) related functionality.
-use bitflags::bitflags;
 use kvm_bindings::{MsrList, Msrs, kvm_msr_entry};
 use kvm_ioctls::{Kvm, VcpuFd};
 
@@ -58,67 +57,6 @@ const MSR_KVM_PV_EOI_EN: u32 = 0x4b56_4d04;
 const MSR_KVM_POLL_CONTROL: u32 = 0x4b56_4d05;
 const MSR_KVM_ASYNC_PF_INT: u32 = 0x4b56_4d06;
 
-bitflags! {
-    /// Feature flags enumerated in the IA32_ARCH_CAPABILITIES MSR.
-    /// See https://www.intel.com/content/www/us/en/developer/articles/technical/software-security-guidance/technical-documentation/cpuid-enumeration-and-architectural-msrs.html
-    #[derive(Default)]
-    #[repr(C)]
-    pub struct ArchCapaMSRFlags: u64 {
-        /// The processor is not susceptible to Rogue Data Cache Load (RDCL).
-        const RDCL_NO               = 1 << 0;
-        /// The processor supports enhanced Indirect Branch Restriction Speculation (IBRS)
-        const IBRS_ALL              = 1 << 1;
-        /// The processor supports RSB Alternate. Alternative branch predictors may be used by RET instructions
-        /// when the RSB is empty. Software using retpoline may be affected by this behavior.
-        const RSBA                  = 1 << 2;
-        /// A value of 1 indicates the hypervisor need not flush the L1D on VM entry.
-        const SKIP_L1DFL_VMENTRY    = 1 << 3;
-        /// Processor is not susceptible to Speculative Store Bypass (SSB).
-        const SSB_NO                = 1 << 4;
-        /// Processor is not susceptible to Microarchitectural Data Sampling (MDS).
-        const MDS_NO                = 1 << 5;
-        /// The processor is not susceptible to a machine check error due to modifying the size of a code page
-        /// without TLB invalidation.
-        const IF_PSCHANGE_MC_NO     = 1 << 6;
-        /// The processor supports RTM_DISABLE and TSX_CPUID_CLEAR.
-        const TSX_CTRL              = 1 << 7;
-        /// Processor is not susceptible to Intel® Transactional Synchronization Extensions
-        /// (Intel® TSX) Asynchronous Abort (TAA).
-        const TAA_NO                = 1 << 8;
-        // Bit 9 is reserved
-        /// Processor supports IA32_MISC_PACKAGE_CTRLS MSR.
-        const MISC_PACKAGE_CTRLS    = 1 << 10;
-        /// Processor supports setting and reading IA32_MISC_PACKAGE_CTLS[0] (ENERGY_FILTERING_ENABLE) bit.
-        const ENERGY_FILTERING_CTL  = 1 << 11;
-        /// The processor supports data operand independent timing mode.
-        const DOITM                 = 1 << 12;
-        /// The processor is not affected by either the Shared Buffers Data Read (SBDR) vulnerability or the
-        /// Sideband Stale Data Propagator (SSDP).
-        const SBDR_SSDP_NO          = 1 << 13;
-        /// The processor is not affected by the Fill Buffer Stale Data Propagator (FBSDP).
-        const FBSDP_NO              = 1 << 14;
-        /// The processor is not affected by vulnerabilities involving the Primary Stale Data Propagator (PSDP).
-        const PSDP_NO               = 1 << 15;
-        // Bit 16 is reserved
-        /// The processor will overwrite fill buffer values as part of MD_CLEAR operations with the VERW instruction.
-        /// On these processors, L1D_FLUSH does not overwrite fill buffer values.
-        const FB_CLEAR              = 1 << 17;
-        /// The processor supports read and write to the IA32_MCU_OPT_CTRL MSR (MSR 123H) and to the FB_CLEAR_DIS bit
-        /// in that MSR (bit position 3).
-        const FB_CLEAR_CTRL         = 1 << 18;
-        /// A value of 1 indicates processor may have the RRSBA alternate prediction behavior,
-        /// if not disabled by RRSBA_DIS_U or RRSBA_DIS_S.
-        const RRSBA                 = 1 << 19;
-        /// A value of 1 indicates BHI_NO branch prediction behavior,
-        /// regardless of the value of IA32_SPEC_CTRL[BHI_DIS_S] MSR bit.
-        const BHI_NO                = 1 << 20;
-        // Bits 21:22 are reserved
-        /// If set, the IA32_OVERCLOCKING STATUS MSR exists.
-        const OVERCLOCKING_STATUS   = 1 << 23;
-        // Bits 24:63 are reserved
-    }
-}
-
 /// Macro for generating a MsrRange.
 #[macro_export]
 macro_rules! MSR_RANGE {