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fix #2318: allow phys-bits CPU setting

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Can be specified for a particular VM or via a custom CPU model (VM takes
precedence).

QEMU's default limit only allows up to 1TB of RAM per VM. Increasing the
physical address bits available to a VM can fix this.

Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
This commit is contained in:
Stefan Reiter 2020-04-07 15:56:19 +02:00 committed by Thomas Lamprecht
parent c4581b9cc5
commit 9f9792d3dc
1 changed files with 41 additions and 0 deletions
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41
PVE/QemuServer/CPUConfig.pm
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@ -149,8 +149,36 @@ my $cpu_fmt = {
pattern => qr/$cpu_flag_any_re(;$cpu_flag_any_re)*/,
optional => 1,
},
'phys-bits' => {
type => 'string',
format => 'pve-phys-bits',
description => "The physical memory address bits that are reported to"
. " the guest OS. Should be smaller or equal to the host's."
. " Set to 'host' to use value from host CPU, but note that"
. " doing so will break live migration to CPUs with other values.",
optional => 1,
},
};
PVE::JSONSchema::register_format('pve-phys-bits', \&parse_phys_bits);
sub parse_phys_bits {
my ($str, $noerr) = @_;
my $err_msg = "value must be an integer between 8 and 64 or 'host'\n";
if ($str !~ m/^(host|\d{1,2})$/) {
die $err_msg if !$noerr;
return undef;
}
if ($str =~ m/^\d+$/ && (int($str) < 8 || int($str) > 64)) {
die $err_msg if !$noerr;
return undef;
}
return $str;
}
# $cpu_fmt describes both the CPU config passed as part of a VM config, as well
# as the definition of a custom CPU model. There are some slight differences
# though, which we catch in the custom verification function below.
@ -472,6 +500,19 @@ sub get_cpu_options {
$cpu_str .= resolve_cpu_flags($pve_flags, $hv_flags, $custom_cputype_flags,
$vm_flags, $pve_forced_flags);
my $phys_bits = '';
foreach my $conf ($custom_cpu, $cpu) {
next if !defined($conf);
my $conf_val = $conf->{'phys-bits'};
next if !$conf_val;
if ($conf_val eq 'host') {
$phys_bits = ",host-phys-bits=true";
} else {
$phys_bits = ",phys-bits=$conf_val";
}
}
$cpu_str .= $phys_bits;
return ('-cpu', $cpu_str);
}