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A comment on Downfall Attacks. Parent comment

Re:Downfall Attacks by rocqua on Tuesday August 08, 2023 @03:48PM (#37054550)
The meltdown and spectre mitigations weren't patched in microcode, they were patched by changing the internal calling methods of the kernel.
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Re:Downfall Attacks by mike_hearn on Tuesday August 08, 2023 @04:06PM (#37054775)
I think it was both. There were initial software only patches, but those were quickly superseded by microcode+kernel patches, where microcode added features the kernel enabled. IBRS or something like that.
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Re:Downfall Attacks by cbsmith on Tuesday August 08, 2023 @04:15PM (#37054883)
It was both, and none of them completely addressed the problem. They did need new hardware for that.
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