[PATCH RFC 0/3] Implement guest time scaling in RISC-V KVM
jiangyifei at huawei.com
Thu Dec 3 07:18:36 EST 2020
This series implements guest time scaling based on RDTIME instruction
emulation so that we can allow migrating Guest/VM across Hosts with
different time frequency.
Why not through para-virt. From arm's experience, para-virt implementation
doesn't really solve the problem for the following two main reasons:
- RDTIME not only be used in linux, but also in firmware and userspace.
- It is difficult to be compatible with nested virtualization.
Yifei Jiang (3):
RISC-V: KVM: Change the method of calculating cycles to nanoseconds
RISC-V: KVM: Support dynamic time frequency from userspace
RISC-V: KVM: Implement guest time scaling
arch/riscv/include/asm/csr.h | 3 ++
arch/riscv/include/asm/kvm_vcpu_timer.h | 13 +++++--
arch/riscv/kvm/vcpu_exit.c | 35 +++++++++++++++++
arch/riscv/kvm/vcpu_timer.c | 51 ++++++++++++++++++++++---
4 files changed, 93 insertions(+), 9 deletions(-)
More information about the kvm-riscv