linux-kernel - [RFC 42/48] RISC-V: Allow host to inject any ext interrupt id to a CoVE guest.

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Message-Id: <20230419221716.3603068-43-atishp@rivosinc.com>
Date:   Wed, 19 Apr 2023 15:17:10 -0700
From:   Atish Patra <atishp@...osinc.com>
To:     linux-kernel@...r.kernel.org
Cc:     Rajnesh Kanwal <rkanwal@...osinc.com>,
        Atish Patra <atishp@...osinc.com>,
        Alexandre Ghiti <alex@...ti.fr>,
        Andrew Jones <ajones@...tanamicro.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Anup Patel <anup@...infault.org>,
        Atish Patra <atishp@...shpatra.org>,
        Björn Töpel <bjorn@...osinc.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Will Deacon <will@...nel.org>, Marc Zyngier <maz@...nel.org>,
        Sean Christopherson <seanjc@...gle.com>,
        linux-coco@...ts.linux.dev, Dylan Reid <dylan@...osinc.com>,
        abrestic@...osinc.com, Samuel Ortiz <sameo@...osinc.com>,
        Christoph Hellwig <hch@...radead.org>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Guo Ren <guoren@...nel.org>, Heiko Stuebner <heiko@...ech.de>,
        Jiri Slaby <jirislaby@...nel.org>,
        kvm-riscv@...ts.infradead.org, kvm@...r.kernel.org,
        linux-mm@...ck.org, linux-riscv@...ts.infradead.org,
        Mayuresh Chitale <mchitale@...tanamicro.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Uladzislau Rezki <urezki@...il.com>
Subject: [RFC 42/48] RISC-V: Allow host to inject any ext interrupt id to a CoVE guest.

From: Rajnesh Kanwal <rkanwal@...osinc.com>

Ideally, host must not inject any external interrupt until explicitly
allowed by the guest. This should be done per interrupt id but currently
adding allow-all call in init_IRQ. In future, it will be modified
to allow specific interrupts only.

Signed-off-by: Rajnesh Kanwal <rkanwal@...osinc.com>
Signed-off-by: Atish Patra <atishp@...osinc.com>
---
 arch/riscv/kernel/irq.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/arch/riscv/kernel/irq.c b/arch/riscv/kernel/irq.c
index eb9a68a..b5e0fd8 100644
--- a/arch/riscv/kernel/irq.c
+++ b/arch/riscv/kernel/irq.c
@@ -11,6 +11,8 @@
 #include <linux/module.h>
 #include <linux/seq_file.h>
 #include <asm/sbi.h>
+#include <asm/covg_sbi.h>
+#include <asm/cove.h>
 
 static struct fwnode_handle *(*__get_intc_node)(void);
 
@@ -36,8 +38,18 @@ int arch_show_interrupts(struct seq_file *p, int prec)
 
 void __init init_IRQ(void)
 {
+	int ret;
+
 	irqchip_init();
 	if (!handle_arch_irq)
 		panic("No interrupt controller found.");
 	sbi_ipi_init();
+
+	if (is_cove_guest()) {
+		/* FIXME: For now just allow all interrupts. */
+		ret = sbi_covg_allow_all_external_interrupt();
+
+		if (ret)
+			pr_err("Failed to allow external interrupts.\n");
+	}
 }
-- 
2.25.1