KVM: VMX: Drop unnecessary vmx_fb_clear_ctrl_available "cache"
Now that KVM snapshots the host's MSR_IA32_ARCH_CAPABILITIES, drop the similar snapshot/cache of whether or not KVM is allowed to manipulate MSR_IA32_MCU_OPT_CTRL.FB_CLEAR_DIS. The motivation for the cache was presumably to avoid the RDMSR, e.g. boot_cpu_has_bug() is quite cheap, and modifying the vCPU's MSR_IA32_ARCH_CAPABILITIES is an infrequent option and a relatively slow path. Cc: Pawan Gupta <pawan.kumar.gupta@linux.intel.com> Reviewed-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com> Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com> Link: https://lore.kernel.org/r/20230607004311.1420507-3-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
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