From: Bibo Mao <maobibo@loongson.cn>
To: Huacai Chen <chenhuacai@kernel.org>,
Tianrui Zhao <zhaotianrui@loongson.cn>,
Juergen Gross <jgross@suse.com>
Cc: loongarch@lists.linux.dev, linux-kernel@vger.kernel.org,
virtualization@lists.linux.dev, kvm@vger.kernel.org
Subject: [PATCH 1/5] LoongArch: KVM: Add hypercall instruction emulation support
Date: Wed, 3 Jan 2024 15:16:11 +0800 [thread overview]
Message-ID: <20240103071615.3422264-2-maobibo@loongson.cn> (raw)
In-Reply-To: <20240103071615.3422264-1-maobibo@loongson.cn>
On LoongArch system, hypercall instruction is supported when system
runs on VM mode. This patch adds dummy function with hypercall
instruction emulation, rather than inject EXCCODE_INE invalid
instruction exception.
Signed-off-by: Bibo Mao <maobibo@loongson.cn>
---
arch/loongarch/include/asm/Kbuild | 1 -
arch/loongarch/include/asm/kvm_para.h | 26 ++++++++++++++++++++++++++
arch/loongarch/include/uapi/asm/Kbuild | 2 --
arch/loongarch/kvm/exit.c | 10 ++++++++++
4 files changed, 36 insertions(+), 3 deletions(-)
create mode 100644 arch/loongarch/include/asm/kvm_para.h
delete mode 100644 arch/loongarch/include/uapi/asm/Kbuild
diff --git a/arch/loongarch/include/asm/Kbuild b/arch/loongarch/include/asm/Kbuild
index 93783fa24f6e..22991a6f0e2b 100644
--- a/arch/loongarch/include/asm/Kbuild
+++ b/arch/loongarch/include/asm/Kbuild
@@ -23,4 +23,3 @@ generic-y += poll.h
generic-y += param.h
generic-y += posix_types.h
generic-y += resource.h
-generic-y += kvm_para.h
diff --git a/arch/loongarch/include/asm/kvm_para.h b/arch/loongarch/include/asm/kvm_para.h
new file mode 100644
index 000000000000..9425d3b7e486
--- /dev/null
+++ b/arch/loongarch/include/asm/kvm_para.h
@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_LOONGARCH_KVM_PARA_H
+#define _ASM_LOONGARCH_KVM_PARA_H
+
+/*
+ * LoongArch hypcall return code
+ */
+#define KVM_HC_STATUS_SUCCESS 0
+#define KVM_HC_INVALID_CODE -1UL
+#define KVM_HC_INVALID_PARAMETER -2UL
+
+static inline unsigned int kvm_arch_para_features(void)
+{
+ return 0;
+}
+
+static inline unsigned int kvm_arch_para_hints(void)
+{
+ return 0;
+}
+
+static inline bool kvm_check_and_clear_guest_paused(void)
+{
+ return false;
+}
+#endif /* _ASM_LOONGARCH_KVM_PARA_H */
diff --git a/arch/loongarch/include/uapi/asm/Kbuild b/arch/loongarch/include/uapi/asm/Kbuild
deleted file mode 100644
index 4aa680ca2e5f..000000000000
--- a/arch/loongarch/include/uapi/asm/Kbuild
+++ /dev/null
@@ -1,2 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0
-generic-y += kvm_para.h
diff --git a/arch/loongarch/kvm/exit.c b/arch/loongarch/kvm/exit.c
index e708a1786d6b..59e5fe221982 100644
--- a/arch/loongarch/kvm/exit.c
+++ b/arch/loongarch/kvm/exit.c
@@ -650,6 +650,15 @@ static int kvm_handle_fpu_disabled(struct kvm_vcpu *vcpu)
return RESUME_GUEST;
}
+static int kvm_handle_hypcall(struct kvm_vcpu *vcpu)
+{
+ update_pc(&vcpu->arch);
+
+ /* Treat it as noop intruction, only set return value */
+ vcpu->arch.gprs[LOONGARCH_GPR_A0] = KVM_HC_INVALID_CODE;
+ return RESUME_GUEST;
+}
+
/*
* LoongArch KVM callback handling for unimplemented guest exiting
*/
@@ -679,6 +688,7 @@ static exit_handle_fn kvm_fault_tables[EXCCODE_INT_START] = {
[EXCCODE_TLBM] = kvm_handle_write_fault,
[EXCCODE_FPDIS] = kvm_handle_fpu_disabled,
[EXCCODE_GSPR] = kvm_handle_gspr,
+ [EXCCODE_HVC] = kvm_handle_hypcall,
};
int kvm_handle_fault(struct kvm_vcpu *vcpu, int fault)
--
2.39.3
next prev parent reply other threads:[~2024-01-03 7:16 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-03 7:16 [PATCH 0/5] LoongArch: Add pv ipi support on LoongArch VM Bibo Mao
2024-01-03 7:16 ` Bibo Mao [this message]
2024-01-03 7:16 ` [PATCH 2/5] LoongArch: KVM: Add cpucfg area for kvm hypervisor Bibo Mao
2024-01-03 7:16 ` [PATCH 3/5] LoongArch/smp: Refine ipi ops on LoongArch platform Bibo Mao
2024-01-04 1:51 ` kernel test robot
2024-01-03 7:16 ` [PATCH 4/5] LoongArch: Add paravirt interface for guest kernel Bibo Mao
2024-01-03 7:40 ` Jürgen Groß
2024-01-03 8:00 ` maobibo
2024-01-03 8:14 ` Juergen Gross
2024-01-03 8:54 ` maobibo
2024-01-03 7:16 ` [PATCH 5/5] LoongArch: Add pv ipi support on LoongArch system Bibo Mao
2024-01-09 6:00 ` kernel test robot
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