linux-kernel - Re: [RFC PATCH] kvm/riscv: Add ctxsstatus and ctxhstatus for migration

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Message-Id: <DCTJ9US6E4PG.1MA4ICDR21DS6@ventanamicro.com>
Date: Mon, 15 Sep 2025 19:01:03 +0200
From: Radim Krčmář <rkrcmar@...tanamicro.com>
To: "Jinyu Tang" <tjytimi@....com>, "Anup Patel" <anup@...infault.org>,
 "Atish Patra" <atish.patra@...ux.dev>, "Andrew Jones"
 <ajones@...tanamicro.com>, "Conor Dooley" <conor.dooley@...rochip.com>,
 "Yong-Xuan Wang" <yongxuan.wang@...ive.com>, "Paul Walmsley"
 <paul.walmsley@...ive.com>, "Nutty Liu" <nutty.liu@...mail.com>
Cc: <kvm@...r.kernel.org>, <kvm-riscv@...ts.infradead.org>,
 <linux-riscv@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
 "Tianshun Sun" <stsmail163@....com>
Subject: Re: [RFC PATCH] kvm/riscv: Add ctxsstatus and ctxhstatus for
 migration

2025-09-15T18:52:56+02:00, Radim Krčmář <rkrcmar@...tanamicro.com>:
> 2025-09-15T23:27:31+08:00, Jinyu Tang <tjytimi@....com>:
>> +	if (reg_num == KVM_REG_RISCV_CSR_REG(ctxhstatus))
>> +		csr->ctxhstatus = vcpu->arch.guest_context.hstatus;
>
> Neither should userspace be able to directly set hstatus.
> KVM should derive it from other userspace configuration.
>
> What isn't correctly reflected in hstatus?

Ah, we don't set hstatus.SPVP when setting KVM_REG_RISCV_CORE_REG(mode).