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check ToPA allocation success

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Check size returned for ToA allocation instead of blind mmap + assert.
Requires KVM-Nyx change to return error on allocation fail.
This commit is contained in:
Steffen Schulz 2022-12-14 17:23:14 -08:00 committed by Sergej Schumilo
parent 5701e26966
commit b1fd5f1039
1 changed files with 5 additions and 0 deletions
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5
nyx/pt.c
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@ -322,6 +322,11 @@ void pt_pre_kvm_run(CPUState *cpu)
assert(cpu->pt_fd != -1);
ret = ioctl(cpu->pt_fd, KVM_VMX_PT_GET_TOPA_SIZE, (unsigned long)0x0);
if (ret == -1) {
nyx_abort("ToPA allocation failure. Check kernel logs.\n");
}
assert(ret % PAGE_SIZE == 0);
cpu->pt_mmap = mmap((void *)PT_BUFFER_MMAP_ADDR, ret,
PROT_READ | PROT_WRITE, MAP_SHARED, cpu->pt_fd, 0);
assert(cpu->pt_mmap != (void *)0xFFFFFFFFFFFFFFFF);