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 6BEBE41D134; Mon, 3 Aug 2026 13:47:02 +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=1785764824; cv=none; b=txsN5A3G9TUySY4iM3tpO8onpmq8U45qv3ibec8ODl7teWo77r5WIWwVDCxxDZOGcoZIbIhCvkIFVE6uFJSqTdsCPdaIMv/FC9AxY6k+z8jhDMazIAui7+5qCFXKMUkCoIiVJ82TXkwFXdAp0KcMN8V3C1Rm1FIHlvni6dn4pI0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785764824; c=relaxed/simple; bh=R90GSqHKgNKLq0IbPcgJ2Xy7BoduOtRWpnHj0KKueKk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=rkx0DtQLt8WmxDwA0wthnKyWHsbYJYQ6Iok8ojO2CWB+gkQV55GI0NGbGu6/LJDAok78Cld9vJ7yYlBsnRtXNtoYA3QlrHd/jjKzRcpPacjrPGr5qsOmovzvgxKgTt5ZWIcOrqKtjZOemb+5qaSAtDanO4/hZbqJ9bMhUbL5kPo= 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=W5i9r3b6; 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="W5i9r3b6" 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 D6C3C1655; Mon, 3 Aug 2026 06:46:57 -0700 (PDT) Received: from e122027.cambridge.arm.com (e122027.cambridge.arm.com [10.1.25.28]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 4B96F3F66F; Mon, 3 Aug 2026 06:46:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1785764821; bh=R90GSqHKgNKLq0IbPcgJ2Xy7BoduOtRWpnHj0KKueKk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=W5i9r3b6l4ACstwJ4hcdMWGUNalMjpqK3Kfd2nYwLQ/rPRTuQYAK7sF0ZcIktlg2B HasUL/a8gkc/mzH1Bv24AeL0mjMDbypOSPJ+yuhJ4kIVYfC73yJuZiUsIlugGhPmd6 /2xke7+wX/ywgclM9eJm8JOCYys0O6htTk+rDxZ8= 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 v16 35/45] KVM: arm64: CCA: Support RSI_HOST_CALL Date: Mon, 3 Aug 2026 14:43:51 +0100 Message-ID: <20260803134403.80630-36-steven.price@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260803134403.80630-1-steven.price@arm.com> References: <20260803134403.80630-1-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 --- Changes since v15: * Adapt to new exit handling. 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 | 1 + arch/arm64/kvm/rmi.c | 4 ++++ 2 files changed, 5 insertions(+) diff --git a/arch/arm64/kvm/rmi-exit.c b/arch/arm64/kvm/rmi-exit.c index 1749cde2edff..7cde820bb77b 100644 --- a/arch/arm64/kvm/rmi-exit.c +++ b/arch/arm64/kvm/rmi-exit.c @@ -164,6 +164,7 @@ int kvm_rec_exit(struct kvm_vcpu *vcpu, int rec_run_ret) case RMI_EXIT_SERROR: return ARM_EXCEPTION_EL1_SERROR; case RMI_EXIT_PSCI: + case RMI_EXIT_HOST_CALL: rec_exit_hvc(vcpu); kvm_make_request(KVM_REQ_RMI, vcpu); return ARM_EXCEPTION_TRAP; diff --git a/arch/arm64/kvm/rmi.c b/arch/arm64/kvm/rmi.c index 3f31ad25680f..904df7c7245d 100644 --- a/arch/arm64/kvm/rmi.c +++ b/arch/arm64/kvm/rmi.c @@ -1203,6 +1203,10 @@ int kvm_rec_handle_request(struct kvm_vcpu *vcpu) return kvm_rec_complete_psci(vcpu); case RMI_EXIT_RIPAS_CHANGE: return kvm_complete_ripas_change(vcpu); + case RMI_EXIT_HOST_CALL: + for (int i = 0; i < REC_RUN_GPRS; i++) + rec->run->enter.gprs[i] = vcpu_get_reg(vcpu, i); + break; default: KVM_BUG(1, vcpu->kvm, "Unhandled realm exit_reason"); return -ENXIO; -- 2.43.0