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 6E0662C0294; Wed, 13 May 2026 13:21:31 +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=1778678492; cv=none; b=aA+PCRhmT/gfTztdA9wWiUaAexrZQNYt+Wezh0Xsq+JBRdQVi3xmVoCjyWlJaHQDdVw4NZ7kZu79wAKU6e98rmjsl27zv6FnfaIXphaJ2ZrTDdRwBQhCdxkK3qNIwl9vDQpWFiky5NCCl488p/PGI0MkOF7X/7Jce8YGsZ5e6Z4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778678492; c=relaxed/simple; bh=Ow/IGXOddnm66B7huM+It8sJezG0pnBQOLDqdvVGnsc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=bEGHi0RfrLPx5t3robVX5mdP0wXmHpJr4TTZfEyQPTg9MjHcB1IfpDvn9XYIIZOAryfRNeY/2KRNziq4xG6OMbmvDtr3IRCDscfrIi1R6cYXtfZY4k2iZhcFj3ShSZYPm+dVARmQjA4/mIZ82M3xzADX1DvWt6eGq72aQbQ6ALM= 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=V/b1mdgz; 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="V/b1mdgz" 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 AF6E72720; Wed, 13 May 2026 06:21:25 -0700 (PDT) Received: from e122027.arm.com (unknown [10.57.68.187]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 89F9B3F836; Wed, 13 May 2026 06:21:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1778678490; bh=Ow/IGXOddnm66B7huM+It8sJezG0pnBQOLDqdvVGnsc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=V/b1mdgzMGieL2CmRdVkKSLZUOJx1CPwRTjhD3EQwBGPRWbtzKl90LQa/ZdObdUO6 6/cHiTIsCPeWj2E8/JmnIs00zZlzHl3ksHZKv0I/OTrwZqwe9x5yig8Aa1f2UVMxrB OiG6zELIo0gFComQechx3tTHOWKKziPj0SRn88wc= 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.Pieralisi2@arm.com, Steven Price Subject: [PATCH v14 35/44] arm64: RMI: support RSI_HOST_CALL Date: Wed, 13 May 2026 14:17:43 +0100 Message-ID: <20260513131757.116630-36-steven.price@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260513131757.116630-1-steven.price@arm.com> References: <20260513131757.116630-1-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 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/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 8ec0d179eba2..e5647aa004d3 100644 --- a/arch/arm64/kvm/rmi-exit.c +++ b/arch/arm64/kvm/rmi-exit.c @@ -116,6 +116,19 @@ 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; @@ -191,6 +204,8 @@ 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