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authorAtish Patra <atishp@rivosinc.com>2022-07-22 09:50:47 -0700
committerPalmer Dabbelt <palmer@rivosinc.com>2022-08-12 07:43:57 -0700
commit8f5cb44b1bae8520c0705ce348b30ffb1fdda43a (patch)
tree4e80fff0b3baebf935b46b2aa13a2c62678754a6 /tools
parent9801002f76c63327cae6e90097d3d0afb1e1b562 (diff)
RISC-V: KVM: Support sstc extension
Sstc extension allows the guest to program the vstimecmp CSR directly instead of making an SBI call to the hypervisor to program the next event. The timer interrupt is also directly injected to the guest by the hardware in this case. To maintain backward compatibility, the hypervisors also update the vstimecmp in an SBI set_time call if the hardware supports it. Thus, the older kernels in guest also take advantage of the sstc extension. Reviewed-by: Anup Patel <anup@brainfault.org> Signed-off-by: Atish Patra <atishp@rivosinc.com> Acked-by: Anup Patel <anup@brainfault.org> Link: https://lore.kernel.org/all/CAAhSdy2mb6wyqy0NAn9BcTWKMYEc0Z4zU3s3j7oNqBz6eDQ9sg@mail.gmail.com/ Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
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