linux-kernel - [RFC 02/48] RISC-V: KVM: Improve KVM error reporting to the user space

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Date:   Wed, 19 Apr 2023 15:16:30 -0700
From:   Atish Patra <atishp@...osinc.com>
To:     linux-kernel@...r.kernel.org
Cc:     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>,
        Rajnesh Kanwal <rkanwal@...osinc.com>,
        Uladzislau Rezki <urezki@...il.com>
Subject: [RFC 02/48] RISC-V: KVM: Improve KVM error reporting to the user space

This patch adds RISC-V specific cause for ioctl run failure.
For now, it will be used for the below two cases:

1. Insufficient IMSIC files if VM is configured to run in HWACCEL mode
2. TSM is unable to run run_vcpu SBI call for TVMs

KVM also uses a custom scause bit(48) to distinguish this case
from regular vcpu exit causes.

Signed-off-by: Atish Patra <atishp@...osinc.com>
---
 arch/riscv/include/asm/csr.h      | 2 ++
 arch/riscv/include/uapi/asm/kvm.h | 4 ++++
 2 files changed, 6 insertions(+)

diff --git a/arch/riscv/include/asm/csr.h b/arch/riscv/include/asm/csr.h
index 3176355..e78503a 100644
--- a/arch/riscv/include/asm/csr.h
+++ b/arch/riscv/include/asm/csr.h
@@ -96,6 +96,8 @@
 #define EXC_VIRTUAL_INST_FAULT		22
 #define EXC_STORE_GUEST_PAGE_FAULT	23
 
+#define EXC_CUSTOM_KVM_COVE_RUN_FAIL	48
+
 /* PMP configuration */
 #define PMP_R			0x01
 #define PMP_W			0x02
diff --git a/arch/riscv/include/uapi/asm/kvm.h b/arch/riscv/include/uapi/asm/kvm.h
index b41d0e7..11440df 100644
--- a/arch/riscv/include/uapi/asm/kvm.h
+++ b/arch/riscv/include/uapi/asm/kvm.h
@@ -245,6 +245,10 @@ enum KVM_RISCV_SBI_EXT_ID {
 /* One single KVM irqchip, ie. the AIA */
 #define KVM_NR_IRQCHIPS			1
 
+/* run->fail_entry.hardware_entry_failure_reason codes. */
+#define KVM_EXIT_FAIL_ENTRY_IMSIC_FILE_UNAVAILABLE (1ULL << 0)
+#define KVM_EXIT_FAIL_ENTRY_COVE_RUN_VCPU          (1ULL << 1)
+
 #endif
 
 #endif /* __LINUX_KVM_RISCV_H */
-- 
2.25.1