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RISC-V: KVM: Fix HSM hart status error propagation

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kvm_sbi_hsm_vcpu_get_status() returns SBI_ERR_INVALID_PARAM when
the requested hart does not exist. However, the HART_STATUS case
returns from the SBI handler without storing this error in
retdata->err_val.

As a result, a guest querying the status of a non-existent hart
observes SBI_SUCCESS instead of SBI_ERR_INVALID_PARAM.

Use the common SBI error handling path for HART_STATUS after
saving a valid hart state in retdata->out_val. This preserves
the returned error when kvm_sbi_hsm_vcpu_get_status() fails.

Fixes: bae0dfd74e ("RISC-V: KVM: Modify SBI extension handler to return SBI error code")
Cc: stable@vger.kernel.org
Assisted-by: LLM
Signed-off-by: Tan Chi <tanchi25@mails.ucas.ac.cn>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20260914031146.446157-1-tanchi25@mails.ucas.ac.cn
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Tan Chi 2026-09-14 11:11:46 +08:00 committed by Anup Patel
parent c7e2cc38c5
commit 41e81f7e3e
1 changed files with 2 additions and 2 deletions
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4
arch/riscv/kvm/vcpu_sbi_hsm.c
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@ -95,9 +95,9 @@ static int kvm_sbi_ext_hsm_handler(struct kvm_vcpu *vcpu, struct kvm_run *run,
ret = kvm_sbi_hsm_vcpu_get_status(vcpu);
if (ret >= 0) {
retdata->out_val = ret;
retdata->err_val = 0;
ret = 0;
}
return 0;
break;
case SBI_EXT_HSM_HART_SUSPEND:
switch (lower_32_bits(cp->a0)) {
case SBI_HSM_SUSPEND_RET_DEFAULT: