From nobody Sat Oct 11 08:18:40 2025 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 35C0927602D; Wed, 11 Jun 2025 10:50:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749639042; cv=none; b=m7BL+0zVyT9cgHUuMtTghkNIYYgXgYedsD/0b1SwhuzGCdVL2xdjavKVSwotc6MU7d29eyoLgVfNfs5W6db3dvCORlxbK5a3TfuDb0usYEQI6E9xKbFAQnSMYba/PIhnDidq1e4QMPLOvkjJ+3Ci45V2Q79H8OHXwkyuJooVWLo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749639042; c=relaxed/simple; bh=TtjFN0gbNk28nB1srh2+wU6pmIbOnMg4W1b61+U7w9I=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=t9zCLX6hv0W0/0akz5uAfhMXT8pddSg5wFPI8CevLd3U6EDcGhRhrarO9lT6JK251c8sRsdGt3CXUzEO+GBukxtm4SXh9XoGW/XLqBCd5rETyr/GT1Jd/wu7gNTT9yjhj5yi60RyFU6Qxg/1zYPN43R+xTKdehrnIxztTEUW/+0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id ED65D1BCA; Wed, 11 Jun 2025 03:50:20 -0700 (PDT) Received: from e122027.arm.com (unknown [10.57.67.107]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 34C4E3F673; Wed, 11 Jun 2025 03:50:37 -0700 (PDT) From: Steven Price To: kvm@vger.kernel.org, kvmarm@lists.linux.dev Cc: Joey Gouly , Catalin Marinas , Marc Zyngier , Will Deacon , James Morse , Oliver Upton , Suzuki K Poulose , Zenghui Yu , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Alexandru Elisei , Christoffer Dall , Fuad Tabba , linux-coco@lists.linux.dev, Ganapatrao Kulkarni , Gavin Shan , Shanker Donthineni , Alper Gun , "Aneesh Kumar K . V" , Emi Kisanuki , Steven Price Subject: [PATCH v9 27/43] arm64: RME: support RSI_HOST_CALL Date: Wed, 11 Jun 2025 11:48:24 +0100 Message-ID: <20250611104844.245235-28-steven.price@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250611104844.245235-1-steven.price@arm.com> References: <20250611104844.245235-1-steven.price@arm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Joey Gouly Forward RSI_HOST_CALLS to KVM's HVC handler. Signed-off-by: Joey Gouly Signed-off-by: Steven Price Reviewed-by: Gavin Shan --- Changes since v7: * Avoid turning a negative return from kvm_smccc_call_handler() into a error response to the guest. Instead propogate the error back to user space. Changes since v4: * Setting GPRS is now done by kvm_rec_enter() rather than rec_exit_host_call() (see previous patch - arm64: RME: Handle realm enter/exit). This fixes a bug where the registers set by user space were being ignored. --- arch/arm64/kvm/rme-exit.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/arch/arm64/kvm/rme-exit.c b/arch/arm64/kvm/rme-exit.c index 813fc96d8099..d41d8dcfd0e9 100644 --- a/arch/arm64/kvm/rme-exit.c +++ b/arch/arm64/kvm/rme-exit.c @@ -116,6 +116,19 @@ static int rec_exit_ripas_change(struct kvm_vcpu *vcpu) return -EFAULT; } =20 +static int rec_exit_host_call(struct kvm_vcpu *vcpu) +{ + int i; + struct realm_rec *rec =3D &vcpu->arch.rec; + + vcpu->stat.hvc_exit_stat++; + + for (i =3D 0; i < REC_RUN_GPRS; i++) + vcpu_set_reg(vcpu, i, rec->run->exit.gprs[i]); + + return kvm_smccc_call_handler(vcpu); +} + static void update_arch_timer_irq_lines(struct kvm_vcpu *vcpu) { struct realm_rec *rec =3D &vcpu->arch.rec; @@ -183,6 +196,8 @@ int handle_rec_exit(struct kvm_vcpu *vcpu, int rec_run_= ret) return rec_exit_psci(vcpu); case RMI_EXIT_RIPAS_CHANGE: return rec_exit_ripas_change(vcpu); + case RMI_EXIT_HOST_CALL: + return rec_exit_host_call(vcpu); } =20 kvm_pr_unimpl("Unsupported exit reason: %u\n", --=20 2.43.0