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hw/i386/pc: fix regression in parsing vga cmdline parameter 

When the 'vga=' parameter is succeeded by another parameter, QEMU 4.2.0
would refuse to start with a rather cryptic message:

    $ qemu-system-x86_64 -kernel /boot/vmlinuz-linux -append 'vga=792 quiet'
    qemu: can't parse 'vga' parameter: Invalid argument

It was not clear whether this applied to the '-vga std' parameter or the
'-append' one. Fix the parsing regression and clarify the error.

Fixes: 133ef074bd ("hw/i386/pc: replace use of strtol with qemu_strtoui in x86_load_linux()")
Cc: Sergio Lopez <slp@redhat.com>
Signed-off-by: Peter Wu <peter@lekensteyn.nl>
Message-Id: <20191221162124.1159291-1-peter@lekensteyn.nl>
Cc: qemu-stable@nongnu.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Peter Wu 2019-12-21 17:21:24 +01:00 committed by Paolo Bonzini
parent 218fc2b5c8
commit a88c40f02a
1 changed files with 4 additions and 4 deletions
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8
hw/i386/x86.c
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@ -612,6 +612,7 @@ void x86_load_linux(X86MachineState *x86ms,
vmode = strstr(kernel_cmdline, "vga=");
if (vmode) {
unsigned int video_mode;
const char *end;
int ret;
/* skip "vga=" */
vmode += 4;
@ -622,10 +623,9 @@ void x86_load_linux(X86MachineState *x86ms,
} else if (!strncmp(vmode, "ask", 3)) {
video_mode = 0xfffd;
} else {
ret = qemu_strtoui(vmode, NULL, 0, &video_mode);
if (ret != 0) {
fprintf(stderr, "qemu: can't parse 'vga' parameter: %s\n",
strerror(-ret));
ret = qemu_strtoui(vmode, &end, 0, &video_mode);
if (ret != 0 || (*end && *end != ' ')) {
fprintf(stderr, "qemu: invalid 'vga=' kernel parameter.\n");
exit(1);
}
}