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53 lines
1.8 KiB
Plaintext
53 lines
1.8 KiB
Plaintext
#!/usr/bin/stap
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#
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# Copyright (C) 2022 Red Hat, Inc.
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library. If not, see
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# <http://www.gnu.org/licenses/>.
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#
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# A script that captures the VMSA blob for the boot vCPU and
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# first additional vCPU, when a KVM guest is booted with SEV-ES
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#
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# NOTE: This directly references specific structures and places in the
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# kernel source code. It is expected that this example will need to be
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# edited to match the kernel you intend to run it against.
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#
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# The captured VMSA will be printed to the console in hex format,
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# and can be converted to the required binary format by feeding
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# it through
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#
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# perl -e 'while (<>) { print pack("C64", map { hex($_) } ( $_ =~ m/../g )); }' > vmsa.bin
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#
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probe begin {
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printf("Running\n")
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}
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function dump_vmsa(addr:long) {
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printf("VMSA\n")
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for (i = 0; i < 4096 ; i+= 64) {
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printf("%.64M\n", addr + i);
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}
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}
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# This line number will need to be updated for the specific kernel
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# version that is being probed. The line that needs to be targeted
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# is the one between the call to clflush_cache_range(...) and the
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# call to sev_issue_cmd(kvm, SEV_CMD_LAUNCH_UPDATE...).
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#
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# Line 635 is correct for Linux v6.3
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probe module("kvm_amd").statement("__sev_launch_update_vmsa@arch/x86/kvm/svm/sev.c:635") {
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dump_vmsa($svm->sev_es->vmsa)
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}
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