2 Commits

Author	SHA1	Message	Date
Hoa Nguyen	52485bbc38	dev: Make VirtIORng device use gem5's rng instead of C++'s ... Currently, VirtIORng uses C++'s RNG. This causes nondeterminism across simulations using this device. One example is the example RISC-V board booting Ubuntu, configs/example/gem5_library/riscv-ubuntu-run.py JIRA: https://gem5.atlassian.net/browse/GEM5-1193 Change-Id: I299e72eb891819007b4260390f5c2ba94d2dec7b Signed-off-by: Hoa Nguyen <hoanguyen@ucdavis.edu> Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/56889 Maintainer: Bobby Bruce <bbruce@ucdavis.edu> Reviewed-by: Jason Lowe-Power <power.jg@gmail.com> Tested-by: kokoro <noreply+kokoro@google.com>	2022-02-23 02:21:15 +00:00
Luming Wang	f67ff25f7b	arch-riscv, dev: add VirtIO entropy device(VirtIORng) support ... Systemd, which is used by many main stream Linux distributions, will lead to slow boot if entropy is low. On X86 platforms, this problem can be alleviated by enabling RDRAND instructions. However, RISC-V doesn't have similar instructions. For QEMU/KVM, this problem can be solved by passing randomness from the host via virtio_rng. But gem5 doesn't have VirtIORng support now. Some user report that the boot time of riscv-ubuntu-run.py is too long. To alleviate this problem, this patch add VirtIORng device support for gem5. Change-Id: Id93b5703161701212fd6683837034cb0cff590c5 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/55483 Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu> Maintainer: Bobby Bruce <bbruce@ucdavis.edu> Tested-by: kokoro <noreply+kokoro@google.com>	2022-01-21 01:18:31 +00:00