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regress: Test vmcall raises #UD

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On Intel/VMX the hypervisor will inject #UD when userland tries to
execute the vmcall instruction.

On AMD/SVM vmcall is an invalid instruction, so the CPU will raise

ok mlarkin@
This commit is contained in:
hshoexer
2026-02-16 13:05:14 +00:00
parent cf1866c0c5
commit c7faaa76b4
3 changed files with 93 additions and 1 deletions
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3
regress/sys/arch/amd64/Makefile
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@@ -1,10 +1,11 @@
# $OpenBSD: Makefile,v 1.4 2025/10/22 14:22:00 hshoexer Exp $
# $OpenBSD: Makefile,v 1.5 2026/02/16 13:05:14 hshoexer Exp $
.if ${MACHINE_ARCH} == "amd64"
SUBDIR += ddb
SUBDIR += dump_tables
SUBDIR += fpu
SUBDIR += seves_mmio
SUBDIR += vmcall
SUBDIR += vmm
.elif make(regress) || make(all)

28
regress/sys/arch/amd64/vmcall/Makefile Normal file
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@@ -0,0 +1,28 @@
# $OpenBSD: Makefile,v 1.1 2026/02/16 13:05:14 hshoexer Exp $
.if "${MACHINE_ARCH}" != amd64
regress:
# MACHINE_ARCH is not amd64
@echo SKIPPED
.else
PROGS = vmcall
WARNINGS = yes
REGRESS_TARGETS = run-regress-vmcall
run-regress-vmcall: vmcall
./vmcall
.if ! (make(clean) || make(cleandir) || make(obj))
.include <bsd.own.mk>
VMMODE != /sbin/sysctl -n machdep.vmmode
HYPVERVISOR!= /sbin/sysctl -n hw.vendor
# Only run test on vmm(4) guests
.if "${VMMODE}" == "host" || "${HYPVERVISOR}" != "OpenBSD"
REGRESS_SKIP_TARGETS = ${REGRESS_TARGETS}
.endif
.endif
.endif
.include <bsd.regress.mk>

63
regress/sys/arch/amd64/vmcall/vmcall.c Normal file
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@@ -0,0 +1,63 @@
/* $OpenBSD: vmcall.c,v 1.1 2026/02/16 13:05:14 hshoexer Exp $ */
/*
* Copyright (c) 2026 Hans-Joerg Hoexer <hshoexer@yerbouti.franken.de>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <err.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
static void
handler(int sig, siginfo_t *sip, void *ctx)
{
printf("signo %d, code %d, errno %d\n", sip->si_signo, sip->si_code,
sip->si_errno);
if (sig != SIGILL)
errx(1, "expected SIGILL: %d", sig);
if (sip->si_code != ILL_PRVOPC)
errx(1, "expected ILL_PRVOPC: %d", sip->si_code);
exit(0);
}
__dead static void
usage(void)
{
fprintf(stderr, "usage: %s\n", getprogname());
exit(2);
}
int
main(int argc, char **argv)
{
struct sigaction sa;
if (argc != 1)
usage();
memset(&sa, 0, sizeof(sa));
sa.sa_sigaction = handler;
sa.sa_flags = SA_SIGINFO;
if (sigaction(SIGILL, &sa, NULL) == -1)
err(2, "sigaction");
asm volatile("vmcall");
errx(1, "expected signal");
return (0);
}