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virtcontainers: Append max_ports to virtio-serial device

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Allow API consumers to change the maximum number of ports in the
virtio-serial devices, setting a lower number of ports can improve the
boot time and reduce the attack surface.

Before this patch on arm64:
[    0.028664] Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled
[    0.055031] printk: console [hvc0] enabled

After this patch on arm64:
[    0.028484] Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled
[    0.031370] printk: console [hvc0] enabled

Fixes: #2676
Signed-off-by: Jia He <justin.he@arm.com>
This commit is contained in:
Jia He 2020-10-14 13:55:16 +08:00
parent 25cdf2d728
commit da79b4be67
2 changed files with 4 additions and 2 deletions
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1
src/runtime/virtcontainers/qemu_arch_base.go
View File

@ -308,6 +308,7 @@ func (q *qemuArchBase) appendConsole(devices []govmmQemu.Device, path string) ([
Driver: govmmQemu.VirtioSerial,
ID: "serial0",
DisableModern: q.nestedRun,
MaxPorts: uint(2),
}
devices = append(devices, serial)

5
src/runtime/virtcontainers/qemu_arch_base_test.go
View File

@ -240,8 +240,9 @@ func TestQemuArchBaseAppendConsoles(t *testing.T) {
expectedOut := []govmmQemu.Device{
govmmQemu.SerialDevice{
Driver: govmmQemu.VirtioSerial,
ID: "serial0",
Driver: govmmQemu.VirtioSerial,
ID: "serial0",
MaxPorts: uint(2),
},
govmmQemu.CharDevice{
Driver: govmmQemu.Console,