linux-kernel - [PATCH v21 25/29] LoongArch: KVM: Implement kvm exception vector

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Date:   Fri, 15 Sep 2023 09:49:45 +0800
From:   Tianrui Zhao <zhaotianrui@...ngson.cn>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Huacai Chen <chenhuacai@...nel.org>,
        WANG Xuerui <kernel@...0n.name>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        loongarch@...ts.linux.dev, Jens Axboe <axboe@...nel.dk>,
        Mark Brown <broonie@...nel.org>,
        Alex Deucher <alexander.deucher@....com>,
        Oliver Upton <oliver.upton@...ux.dev>, maobibo@...ngson.cn,
        Xi Ruoyao <xry111@...111.site>, zhaotianrui@...ngson.cn
Subject: [PATCH v21 25/29] LoongArch: KVM: Implement kvm exception vector

Implement kvm exception vector, using _kvm_fault_tables array to save
the handle function pointer and it is used when vcpu handle exit.

Reviewed-by: Bibo Mao <maobibo@...ngson.cn>
Signed-off-by: Tianrui Zhao <zhaotianrui@...ngson.cn>
---
 arch/loongarch/kvm/exit.c | 45 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)

diff --git a/arch/loongarch/kvm/exit.c b/arch/loongarch/kvm/exit.c
index a91811918d..6ceeddf581 100644
--- a/arch/loongarch/kvm/exit.c
+++ b/arch/loongarch/kvm/exit.c
@@ -664,3 +664,48 @@ static int kvm_handle_fpu_disabled(struct kvm_vcpu *vcpu)
 	kvm_own_fpu(vcpu);
 	return RESUME_GUEST;
 }
+
+/*
+ * Loongarch KVM callback handling for not implemented guest exiting
+ */
+static int kvm_fault_ni(struct kvm_vcpu *vcpu)
+{
+	unsigned long estat, badv;
+	unsigned int exccode, inst;
+
+	/*
+	 *  Fetch the instruction.
+	 */
+	badv = vcpu->arch.badv;
+	estat = vcpu->arch.host_estat;
+	exccode = (estat & CSR_ESTAT_EXC) >> CSR_ESTAT_EXC_SHIFT;
+	inst = vcpu->arch.badi;
+	kvm_err("Exccode: %d PC=%#lx inst=0x%08x BadVaddr=%#lx estat=%#lx\n",
+			exccode, vcpu->arch.pc, inst, badv, read_gcsr_estat());
+	kvm_arch_vcpu_dump_regs(vcpu);
+	kvm_queue_exception(vcpu, EXCCODE_INE, 0);
+	return RESUME_GUEST;
+}
+
+static exit_handle_fn kvm_fault_tables[EXCCODE_INT_START] = {
+	[EXCCODE_TLBL]			= kvm_handle_read_fault,
+	[EXCCODE_TLBI]			= kvm_handle_read_fault,
+	[EXCCODE_TLBS]			= kvm_handle_write_fault,
+	[EXCCODE_TLBM]			= kvm_handle_write_fault,
+	[EXCCODE_FPDIS]			= kvm_handle_fpu_disabled,
+	[EXCCODE_GSPR]			= kvm_handle_gspr,
+};
+
+void kvm_init_fault(void)
+{
+	int i;
+
+	for (i = 0; i < EXCCODE_INT_START; i++)
+		if (!kvm_fault_tables[i])
+			kvm_fault_tables[i] = kvm_fault_ni;
+}
+
+int kvm_handle_fault(struct kvm_vcpu *vcpu, int fault)
+{
+	return kvm_fault_tables[fault](vcpu);
+}
-- 
2.39.1