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860411e045
"Some AMD processors only support a non-architectural means of enabling speculative store bypass disable (SSBD). To allow a simplified view of this to a guest, an architectural definition has been created through a new CPUID bit, 0x80000008_EBX[25], and a new MSR, 0xc001011f. With this, a hypervisor can virtualize the existence of this definition and provide an architectural method for using SSBD to a guest. Add the new CPUID feature, the new MSR and update the existing SSBD support to use this MSR when present." (from x86/speculation: Add virtualized speculative store bypass disable support in Linux). Backports commit cfeea0c021db6234c154dbc723730e81553924ff from qemu |
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