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RISC-V: KVM: do not EOPNOTSUPP in set KVM_REG_RISCV_TIMER_REG 

The KVM_REG_RISCV_TIMER_REG can be read via get_one_reg(). But trying to
write anything in this reg via set_one_reg() results in an EOPNOTSUPP.

Change the API to behave like cbom_block_size: instead of always
erroring out with EOPNOTSUPP, allow userspace to write the same value
(riscv_timebase) back, throwing an EINVAL if a different value is
attempted.

Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Daniel Henrique Barboza 2023-08-03 13:32:56 -03:00 committed by Anup Patel
parent e29f57911d
commit 432a8b35cc
1 changed files with 2 additions and 1 deletions
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3
arch/riscv/kvm/vcpu_timer.c
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@ -218,7 +218,8 @@ int kvm_riscv_vcpu_set_reg_timer(struct kvm_vcpu *vcpu,
switch (reg_num) {
case KVM_REG_RISCV_TIMER_REG(frequency):
ret = -EOPNOTSUPP;
if (reg_val != riscv_timebase)
return -EINVAL;
break;
case KVM_REG_RISCV_TIMER_REG(time):
gt->time_delta = reg_val - get_cycles64();