fix: map virtio GPU BAR from pcid handoff

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

local/recipes/gpu/redox-drm/source/src/drivers/virtio/mod.rs

@@ -4,7 +4,7 @@ use std::sync::Mutex;
 
 use log::{info, warn};
 use redox_driver_sys::memory::MmioRegion;
-use redox_driver_sys::pci::{PciBarInfo, PciDevice, PciDeviceInfo};
+use redox_driver_sys::pci::{PciBarInfo, PciDeviceInfo};
 
 use crate::driver::{DriverError, DriverEvent, GpuDriver, Result};
 use crate::drivers::interrupt::InterruptHandle;
@@ -32,10 +32,14 @@ fn find_fb_bar(info: &PciDeviceInfo) -> Result<PciBarInfo> {
         .ok_or_else(|| DriverError::Pci("VirtIO GPU has no valid framebuffer BAR".into()))
 }
 
-fn map_bar(device: &mut PciDevice, bar: &PciBarInfo, name: &str) -> Result<MmioRegion> {
-    device
-        .map_bar(bar.index, bar.addr, bar.size as usize)
-        .map_err(|e| DriverError::Mmio(format!("failed to map {name}: {e}")))
+fn map_bar(bar: &PciBarInfo, name: &str) -> Result<MmioRegion> {
+    MmioRegion::map(
+        bar.addr,
+        bar.size as usize,
+        redox_driver_sys::memory::CacheType::DeviceMemory,
+        redox_driver_sys::memory::MmioProt::READ_WRITE,
+    )
+    .map_err(|e| DriverError::Mmio(format!("failed to map {name}: {e}")))
 }
 
 impl VirtioDriver {
@@ -48,10 +52,7 @@ impl VirtioDriver {
         }
 
         let fb_bar = find_fb_bar(&info)?;
-        let mut device = PciDevice::open_location(&info.location)
-            .map_err(|e| DriverError::Pci(format!("open PCI: {e}")))?;
-        let _mmio = map_bar(&mut device, &fb_bar, "VirtIO FB BAR")?;
-        drop(device);
+        let _mmio = map_bar(&fb_bar, "VirtIO FB BAR")?;
 
         info!(
             "redox-drm: VirtIO GPU at {}: {} MiB BAR at {:#x}",