From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 58A3E3016E7; Wed, 15 Jul 2026 14:31:09 +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=1784125872; cv=none; b=Tyuvj9lRDHAVZb0wl3PVMKtQoNHcJOXb9xumcfmGql5vSXMLK/waiGdfzm8lLA4g5yb8VZFXuUleJm2wAUO2fGPh6yLPLo13SQ5koq8g4ErCUGeswF4C7XWHFbKaPH9CxTRZqeNqNw3ARc2erBBTGMqM3vPU82RyBGla2WS3fRU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784125872; c=relaxed/simple; bh=dof2MvH5ZZdVUnaNbvRlQgoLjFLC9SgvdrrOrj7zQ/Q=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=UDzXjkKjZF1B8vZwn2SpCFreVa7X1I4f79qtPUfjp1BYYZ1wzUEX0RFbwHtqs8sqdK+D2ezqcF0PYZhg+9nibQ8QmDGyR4IsNvUV8h/qvnC2GLZcW15cNCiun4/sgxONtQxzbu9EiCFJ3MC7Ye+6Kv6yYfdOvssofvKBlrxFY4E= 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; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b=o2jZ38OJ; 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 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b="o2jZ38OJ" 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 077731BA8; Wed, 15 Jul 2026 07:31:04 -0700 (PDT) Received: from e122027.cambridge.arm.com (e122027.cambridge.arm.com [10.1.25.27]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 6AA253F7B4; Wed, 15 Jul 2026 07:31:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1784125868; bh=dof2MvH5ZZdVUnaNbvRlQgoLjFLC9SgvdrrOrj7zQ/Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=o2jZ38OJ48MTBmi0sJcCw1LnH3btREr/ObkwuJ8+cifSdVYW5zzoV3EjgOvXr2rcr mJ8SDezMSUUlDutNIoQfw1LeuMpJMpe5BIOHYrzuOasV8PoQomJuzvr+WeZxK5bkfw FzDNCrzzcNBj8FLBPjK5P/rN2lz8fCrLHC+dbAao= 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 , Vishal Annapurve , WeiLin.Chang@arm.com, Lorenzo Pieralisi , Steven Price Subject: [PATCH v15 28/37] KVM: arm64: CCA: Support RSI_HOST_CALL Date: Wed, 15 Jul 2026 15:28:30 +0100 Message-ID: <20260715142841.80544-29-steven.price@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260715142841.80544-1-steven.price@arm.com> References: <20260715142841.80544-1-steven.price@arm.com> Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Joey Gouly Realm VMs can talk to the hypervisor using the RSI_HOST_CALL SMC. The RMM forwards this to the host and KVM handles them as regular hypercalls. 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 propagate 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/rmi-exit.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/arch/arm64/kvm/rmi-exit.c b/arch/arm64/kvm/rmi-exit.c index c668cbfa971a..78d9189fd5ca 100644 --- a/arch/arm64/kvm/rmi-exit.c +++ b/arch/arm64/kvm/rmi-exit.c @@ -113,6 +113,19 @@ static int rec_exit_ripas_change(struct kvm_vcpu *vcpu) return -EFAULT; } +static int rec_exit_host_call(struct kvm_vcpu *vcpu) +{ + int i; + struct realm_rec *rec = &vcpu->arch.rec; + + vcpu->stat.hvc_exit_stat++; + + for (i = 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 = &vcpu->arch.rec; @@ -188,6 +201,8 @@ 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); } kvm_pr_unimpl("Unsupported exit reason: %u\n", -- 2.43.0