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.rei...@proxmox.com>
---
Changes in v10:
* Change phys-bits format to 'host'/8-64 instead of seperate 'host-phys-bits'
flag
PVE/QemuServer/CPUConfig.pm | 41 +++++++++++++++++++++++++++++++++++++
1 file changed, 41 insertions(+)
diff --git a/PVE/QemuServer/CPUConfig.pm b/PVE/QemuServer/CPUConfig.pm
index af31b2b..b08588e 100644
--- a/PVE/QemuServer/CPUConfig.pm
+++ b/PVE/QemuServer/CPUConfig.pm
@@ -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);
}
--
2.26.0
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