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target/riscv: Add vstimecmp support

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vstimecmp CSR allows the guest OS or to program the next guest timer
interrupt directly. Thus, hypervisor no longer need to inject the
timer interrupt to the guest if vstimecmp is used. This was ratified
as a part of the Sstc extension.

Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Atish Patra <atishp@rivosinc.com>
Message-Id: <20220824221357.41070-4-atishp@rivosinc.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
This commit is contained in:
Atish Patra 2022-08-24 15:13:57 -07:00 • committed by Alistair Francis
parent 43888c2f18
commit 3ec0fe18a3
6 changed files with 118 additions and 6 deletions
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1
target/riscv/machine.c
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@ -92,6 +92,7 @@ static const VMStateDescription vmstate_hyper = {
VMSTATE_UINTTL(env.hgeie, RISCVCPU),
VMSTATE_UINTTL(env.hgeip, RISCVCPU),
VMSTATE_UINT64(env.htimedelta, RISCVCPU),
VMSTATE_UINT64(env.vstimecmp, RISCVCPU),
VMSTATE_UINTTL(env.hvictl, RISCVCPU),
VMSTATE_UINT8_ARRAY(env.hviprio, RISCVCPU, 64),