DragonFlyBSD

After investigation, the issue is caused by the missing memory maps of the UEFI firmware for the guest.

The UEFI firmware are mapped by QEMU as ROM devices in the ROMD mode. And this is excluded for guest memory mappings in the QEMU NVMM code.

I figured out the following patch that makes NVMM+QEMU to boot with UEFI:

diff --git target/i386/nvmm/nvmm-all.c target/i386/nvmm/nvmm-all.c
index 290077f62..e3c948b31 100644
--- target/i386/nvmm/nvmm-all.c
+++ target/i386/nvmm/nvmm-all.c
@@ -1082,7 +1082,11 @@ nvmm_process_section(MemoryRegionSection *section, int add)
     unsigned int delta;
     uintptr_t hva;

-    if (!memory_region_is_ram(mr)) {
+    /*
+     * Don't exclude ROMD memory; for example, it's used to map UEFI firmware
+     * (if=pflash) and should be mapped for guest.
+     */
+    if (!memory_region_is_ram(mr) && !memory_region_is_romd(mr)) {
         return;
     }

However, NVMM+QEMU is extremely slow and uses 100% CPU. It's even much slower than TCG (i.e., without -accel nvmm).

For example: for QEMU to boot into the UEFI shell on my desktop, it takes ~12 seconds with TCG, but it takes ~170 seconds with NVMM !

Test command:

qemu-system-x86_64 -boot menu=on \
  -drive file=OVMF_CODE.fd,if=pflash,format=raw,readonly=on \
  -drive file=OVMF_VARS.fd,if=pflash,format=raw \
  -display sdl [-accel nvmm]

Hello. I tried using the -bios parameter to add the efi code,like this :

qemu-system-x86_64 \
machine type=q35,accel=nvmm \
-smp cpus=1 -m 8G \
-bios /home/marietto/Desktop/Files/Virt/OVMF/OVMF.fd \
-drive file=/mnt/dk26/bhyve/impish-cuda-11-4-nvidia-470.img,if=none,id=disk0 \
-device virtio-blk-pci,drive=disk0 \
-netdev user,id=net0,hostfwd=tcp:127.0.0.1:6022:22 \
-device virtio-net-pci,netdev=net0 \
-object rng-random,id=rng0,filename=/dev/urandom \
-device virtio-rng-pci,rng=rng0 \
-display curses \
-vga qxl \
-spice addr=127.0.0.1,port=5900,ipv4=on,disable-ticketing=on,seamless-migration=on

but it didn't work :

qemu-system-x86_64: NVMM: Unexpected RDMSR 0x3a, ignored
qemu-system-x86_64: NVMM: Unexpected WRMSR 0x3a [val=0x1], ignored
qemu-system-x86_64: NVMM: Unexpected RDMSR 0x140, ignored
qemu-system-x86_64: NVMM: Unexpected RDMSR 0xce, ignored
qemu-system-x86_64: NVMM: Unexpected WRMSR 0x140 [val=0x0], ignored
qemu-system-x86_64: NVMM: Unexpected RDMSR 0x64e, ignored
qemu-system-x86_64: NVMM: Unexpected RDMSR 0x34, ignored

and this :

qemu-system-x86_64 \
machine type=q35,accel=nvmm \
-smp cpus=1 -m 8G \
-bios /home/marietto/Desktop/Files/Virt/OVMF/QEMU_UEFI_CODE-x86_64.fd \
-drive file=/mnt/dk26/bhyve/impish-cuda-11-4-nvidia-470.img,if=none,id=disk0 \
-device virtio-blk-pci,drive=disk0 \
-netdev user,id=net0,hostfwd=tcp:127.0.0.1:6022:22 \
-device virtio-net-pci,netdev=net0 \
-object rng-random,id=rng0,filename=/dev/urandom \
-device virtio-rng-pci,rng=rng0 \
-display curses \
-vga qxl \
-spice addr=127.0.0.1,port=5900,ipv4=on,disable-ticketing=on,seamless-migration=on

qemu: could not load PC BIOS '/home/marietto/Desktop/Files/Virt/OVMF/QEMU_UEFI_CODE-x86_64.fd'

with this : OVMF_CODE.fd =

qemu-system-x86_64: NVMM: Unexpected RDMSR 0x3a, ignored
qemu-system-x86_64: NVMM: Unexpected WRMSR 0x3a [val=0x1], ignored
qemu-system-x86_64: NVMM: Unexpected RDMSR 0x140, ignored
qemu-system-x86_64: NVMM: Unexpected RDMSR 0xce, ignored
qemu-system-x86_64: NVMM: Unexpected WRMSR 0x140 [val=0x0], ignored
qemu-system-x86_64: NVMM: Unexpected RDMSR 0x64e, ignored
qemu-system-x86_64: NVMM: Unexpected RDMSR 0x34, ignored

with this :

with this : -bios /usr/pkg/share/qemu/edk2-x86_64-code.fd \

qemu: could not load PC BIOS '/usr/pkg/share/qemu/edk2-x86_64-code.fd'