diff mbox series

[v8,27/43] arm64: RME: support RSI_HOST_CALL

Message ID	20250416134208.383984-28-steven.price@arm.com (mailing list archive)
State	New
Headers	show Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 2D1531C5D44; Wed, 16 Apr 2025 13:45:36 +0000 (UTC) From: Steven Price <steven.price@arm.com> To: kvm@vger.kernel.org, kvmarm@lists.linux.dev Cc: Joey Gouly <joey.gouly@arm.com>, Catalin Marinas <catalin.marinas@arm.com>, Marc Zyngier <maz@kernel.org>, Will Deacon <will@kernel.org>, James Morse <james.morse@arm.com>, Oliver Upton <oliver.upton@linux.dev>, Suzuki K Poulose <suzuki.poulose@arm.com>, Zenghui Yu <yuzenghui@huawei.com>, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Alexandru Elisei <alexandru.elisei@arm.com>, Christoffer Dall <christoffer.dall@arm.com>, Fuad Tabba <tabba@google.com>, linux-coco@lists.linux.dev, Ganapatrao Kulkarni <gankulkarni@os.amperecomputing.com>, Gavin Shan <gshan@redhat.com>, Shanker Donthineni <sdonthineni@nvidia.com>, Alper Gun <alpergun@google.com>, "Aneesh Kumar K . V" <aneesh.kumar@kernel.org>, Steven Price <steven.price@arm.com> Subject: [PATCH v8 27/43] arm64: RME: support RSI_HOST_CALL Date: Wed, 16 Apr 2025 14:41:49 +0100 Message-ID: <20250416134208.383984-28-steven.price@arm.com> In-Reply-To: <20250416134208.383984-1-steven.price@arm.com> References: <20250416134208.383984-1-steven.price@arm.com> Precedence: bulk MIME-Version: 1.0 Content-Transfer-Encoding: 8bit
Series	arm64: Support for Arm CCA in KVM \| expand [v8,00/43] arm64: Support for Arm CCA in KVM [v8,01/43] kvm: arm64: Include kvm_emulate.h in kvm/arm_psci.h [v8,02/43] arm64: RME: Handle Granule Protection Faults (GPFs) [v8,03/43] arm64: RME: Add SMC definitions for calling the RMM [v8,04/43] arm64: RME: Add wrappers for RMI calls [v8,05/43] arm64: RME: Check for RME support at KVM init [v8,06/43] arm64: RME: Define the user ABI [v8,07/43] arm64: RME: ioctls to create and configure realms [v8,08/43] kvm: arm64: Don't expose debug capabilities for realm guests [v8,09/43] KVM: arm64: Allow passing machine type in KVM creation [v8,10/43] arm64: RME: RTT tear down [v8,11/43] arm64: RME: Allocate/free RECs to match vCPUs [v8,12/43] KVM: arm64: vgic: Provide helper for number of list registers [v8,13/43] arm64: RME: Support for the VGIC in realms [v8,14/43] KVM: arm64: Support timers in realm RECs [v8,15/43] arm64: RME: Allow VMM to set RIPAS [v8,16/43] arm64: RME: Handle realm enter/exit [v8,17/43] arm64: RME: Handle RMI_EXIT_RIPAS_CHANGE [v8,18/43] KVM: arm64: Handle realm MMIO emulation [v8,19/43] arm64: RME: Allow populating initial contents [v8,20/43] arm64: RME: Runtime faulting of memory [v8,21/43] KVM: arm64: Handle realm VCPU load [v8,22/43] KVM: arm64: Validate register access for a Realm VM [v8,23/43] KVM: arm64: Handle Realm PSCI requests [v8,24/43] KVM: arm64: WARN on injected undef exceptions [v8,25/43] arm64: Don't expose stolen time for realm guests [v8,26/43] arm64: RME: allow userspace to inject aborts [v8,27/43] arm64: RME: support RSI_HOST_CALL [v8,28/43] arm64: RME: Allow checking SVE on VM instance [v8,29/43] arm64: RME: Always use 4k pages for realms [v8,30/43] arm64: RME: Prevent Device mappings for Realms [v8,31/43] arm_pmu: Provide a mechanism for disabling the physical IRQ [v8,32/43] arm64: RME: Enable PMU support with a realm guest [v8,33/43] arm64: RME: Hide KVM_CAP_READONLY_MEM for realm guests [v8,34/43] arm64: RME: Propagate number of breakpoints and watchpoints to userspace [v8,35/43] arm64: RME: Set breakpoint parameters through SET_ONE_REG [v8,36/43] arm64: RME: Initialize PMCR.N with number counter supported by RMM [v8,37/43] arm64: RME: Propagate max SVE vector length from RMM [v8,38/43] arm64: RME: Configure max SVE vector length for a Realm [v8,39/43] arm64: RME: Provide register list for unfinalized RME RECs [v8,40/43] arm64: RME: Provide accurate register list [v8,41/43] KVM: arm64: Expose support for private memory [v8,42/43] KVM: arm64: Expose KVM_ARM_VCPU_REC to user space [v8,43/43] KVM: arm64: Allow activating realms

Commit Message

Steven Price April 16, 2025, 1:41 p.m. UTC

From: Joey Gouly <joey.gouly@arm.com>

Forward RSI_HOST_CALLS to KVM's HVC handler.

Signed-off-by: Joey Gouly <joey.gouly@arm.com>
Signed-off-by: Steven Price <steven.price@arm.com>
---
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 mbox series

Patch

diff --git a/arch/arm64/kvm/rme-exit.c b/arch/arm64/kvm/rme-exit.c
index 6830dc080610..f1443b58c1c4 100644
--- a/arch/arm64/kvm/rme-exit.c
+++ b/arch/arm64/kvm/rme-exit.c
@@ -114,6 +114,19 @@  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;
@@ -175,6 +188,8 @@  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",