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OvmfPkg/RiscVVirt/README: explain that "-bios" is only useful with TCG 

Riscv64 KVM services SBI calls internally, so OpenSBI is not used in such
setups. Restrict the "-bios" flag accordingly. Thanks: Andrei, Drew.

Cc: Andrei Warkentin <andrei.warkentin@intel.com>
Cc: Andrew Jones <ajones@ventanamicro.com>
Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Sunil V L <sunilvl@ventanamicro.com>
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
[lersek@redhat.com: '-bios' is rejected with KVM accel (Drew)]
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Sunil V L <sunilvl@ventanamicro.com>
This commit is contained in:
Laszlo Ersek 2023-09-13 11:08:14 +02:00 committed by mergify[bot]
parent cdfe4310dd
commit 5242bae5dd
1 changed files with 5 additions and 0 deletions
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OvmfPkg/RiscVVirt/README.md
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@ -86,3 +86,8 @@ then specify that binary for QEMU, with the following additional command line
option:
-bios $OPENSBI_DIR/build/platform/generic/firmware/fw_dynamic.bin
Note that the above only makes a difference with software emulation (which you
can force with `-M accel=tcg`). With hardware virtualization (`-M accel=kvm`),
KVM services the SBI (Supervisor Binary Interface) calls internally, therefore
any OpenSBI binary specified with `-bios` is rejected.