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Kernel: Add kernel command line flag to disable VirtIO support

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This command line flag can be used to disable VirtIO support on
certain configurations (native windows) where interfacing with
virtio devices can cause qemu to freeze.
This commit is contained in:
Idan Horowitz 2021-04-18 16:06:35 +03:00 • committed by Andreas Kling
parent 7dc95721ee
commit aaf3d26dae
4 changed files with 12 additions and 0 deletions
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5
Kernel/CommandLine.cpp
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@ -170,6 +170,11 @@ UNMAP_AFTER_INIT bool CommandLine::disable_uhci_controller() const
return contains("disable_uhci_controller");
}
UNMAP_AFTER_INIT bool CommandLine::disable_virtio() const
{
return contains("disable_virtio");
}
UNMAP_AFTER_INIT AHCIResetMode CommandLine::ahci_reset_mode() const
{
const auto ahci_reset_mode = lookup("ahci_reset_mode").value_or("controller");

1
Kernel/CommandLine.h
View file

@ -87,6 +87,7 @@ public:
[[nodiscard]] bool disable_physical_storage() const;
[[nodiscard]] bool disable_ps2_controller() const;
[[nodiscard]] bool disable_uhci_controller() const;
[[nodiscard]] bool disable_virtio() const;
[[nodiscard]] AHCIResetMode ahci_reset_mode() const;
[[nodiscard]] String userspace_init() const;
[[nodiscard]] Vector<String> userspace_init_args() const;

3
Kernel/VirtIO/VirtIO.cpp
View file

@ -24,6 +24,7 @@
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <Kernel/CommandLine.h>
#include <Kernel/VirtIO/VirtIO.h>
#include <Kernel/VirtIO/VirtIOConsole.h>
#include <Kernel/VirtIO/VirtIORNG.h>
@ -32,6 +33,8 @@ namespace Kernel {
void VirtIO::detect()
{
if (kernel_command_line().disable_virtio())
return;
PCI::enumerate([&](const PCI::Address& address, PCI::ID id) {
if (address.is_null() || id.is_null())
return;