linux-kernel - [PATCH v5 28/43] arm64: rme: support RSI_HOST

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Message-Id: <20241004152804.72508-29-steven.price@arm.com>
Date: Fri,  4 Oct 2024 16:27:49 +0100
From: Steven Price <steven.price@....com>
To: kvm@...r.kernel.org,
	kvmarm@...ts.linux.dev
Cc: Joey Gouly <joey.gouly@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Marc Zyngier <maz@...nel.org>,
	Will Deacon <will@...nel.org>,
	James Morse <james.morse@....com>,
	Oliver Upton <oliver.upton@...ux.dev>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Zenghui Yu <yuzenghui@...wei.com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Alexandru Elisei <alexandru.elisei@....com>,
	Christoffer Dall <christoffer.dall@....com>,
	Fuad Tabba <tabba@...gle.com>,
	linux-coco@...ts.linux.dev,
	Ganapatrao Kulkarni <gankulkarni@...amperecomputing.com>,
	Gavin Shan <gshan@...hat.com>,
	Shanker Donthineni <sdonthineni@...dia.com>,
	Alper Gun <alpergun@...gle.com>,
	"Aneesh Kumar K . V" <aneesh.kumar@...nel.org>,
	Steven Price <steven.price@....com>
Subject: [PATCH v5 28/43] arm64: rme: support RSI_HOST_CALL

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

Forward RSI_HOST_CALLS to KVM's HVC handler.

Signed-off-by: Joey Gouly <joey.gouly@....com>
Signed-off-by: Steven Price <steven.price@....com>
---
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 | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/arch/arm64/kvm/rme-exit.c b/arch/arm64/kvm/rme-exit.c
index 1ddbff123149..06ec0d7867d0 100644
--- a/arch/arm64/kvm/rme-exit.c
+++ b/arch/arm64/kvm/rme-exit.c
@@ -115,6 +115,26 @@ static int rec_exit_ripas_change(struct kvm_vcpu *vcpu)
 	return 0;
 }
 
+static int rec_exit_host_call(struct kvm_vcpu *vcpu)
+{
+	int ret, 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]);
+
+	ret = kvm_smccc_call_handler(vcpu);
+
+	if (ret < 0) {
+		vcpu_set_reg(vcpu, 0, ~0UL);
+		ret = 1;
+	}
+
+	return ret;
+}
+
 static void update_arch_timer_irq_lines(struct kvm_vcpu *vcpu)
 {
 	struct realm_rec *rec = &vcpu->arch.rec;
@@ -176,6 +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);
 	}
 
 	kvm_pr_unimpl("Unsupported exit reason: %u\n",
-- 
2.34.1