cachepc

Prime+Probe cache-based side-channel attack on AMD SEV-SNP protected virtual machines
git clone https://git.sinitax.com/sinitax/cachepc
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kvm-pagestep_guest.S (486B)

      1#include "cachepc/const.h"
      2
      3#define TARGET_SET 15
      4
      5.text
      6.align(16)
      7.code16gcc
      8
      9guest:
     10.rept L1_SIZE
     11    nop
     12.endr
     13
     14# instruction on page boundary test
     15    nop
     16.rept 2
     17.rept L1_LINESIZE * L1_SETS - 2
     18    nop
     19.endr
     20    rdtsc # two byte instruction
     21.endr
     22# ---------------------------------
     23
     24# speculation on conditional jump test
     25    mov $0x01, %bx
     26    cmp $0x00, %bx
     27
     28    je skip
     29.rept L1_LINESIZE * L1_SETS * 2
     30    nop
     31.endr
     32skip:
     33# -----------------------------------
     34
     35    jmp guest
     36