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From:   Tianrui Zhao <zhaotianrui@loongson.cn>
To:     Paolo Bonzini <pbonzini@redhat.com>
Cc:     Huacai Chen <chenhuacai@kernel.org>,
        WANG Xuerui <kernel@xen0n.name>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        loongarch@lists.linux.dev, linux-kernel@vger.kernel.org,
        kvm@vger.kernel.org, Jens Axboe <axboe@kernel.dk>,
        Mark Brown <broonie@kernel.org>,
        Alex Deucher <alexander.deucher@amd.com>,
        Oliver Upton <oliver.upton@linux.dev>, maobibo@loongson.cn,
        Xi Ruoyao <xry111@xry111.site>, zhaotianrui@loongson.cn
Subject: [PATCH v6 20/30] LoongArch: KVM: Implement handle csr excption
Date:   Wed, 12 Apr 2023 16:30:13 +0800
Message-Id: <20230412083023.1693910-21-zhaotianrui@loongson.cn>
In-Reply-To: <20230412083023.1693910-1-zhaotianrui@loongson.cn>
References: <20230412083023.1693910-1-zhaotianrui@loongson.cn>
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Implement kvm handle loongarch vcpu exit caused by reading and
writing csr. Using loongarch_csr structure to emulate the registers.

Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
---
 arch/loongarch/include/asm/kvm_csr.h |  55 +++++++++++++++
 arch/loongarch/kvm/exit.c            | 100 +++++++++++++++++++++++++++
 2 files changed, 155 insertions(+)
 create mode 100644 arch/loongarch/include/asm/kvm_csr.h
 create mode 100644 arch/loongarch/kvm/exit.c

diff --git a/arch/loongarch/include/asm/kvm_csr.h b/arch/loongarch/include/asm/kvm_csr.h
new file mode 100644
index 000000000000..18052d0ada6b
--- /dev/null
+++ b/arch/loongarch/include/asm/kvm_csr.h
@@ -0,0 +1,55 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020-2023 Loongson Technology Corporation Limited
+ */
+
+#ifndef __ASM_LOONGARCH_KVM_CSR_H__
+#define __ASM_LOONGARCH_KVM_CSR_H__
+#include <asm/loongarch.h>
+#include <asm/kvm_host.h>
+#include <asm/kvm_vcpu.h>
+#include <linux/uaccess.h>
+#include <linux/kvm_host.h>
+
+#define kvm_read_hw_gcsr(id)		gcsr_read(id)
+#define kvm_write_hw_gcsr(csr, id, val)	gcsr_write(val, id)
+
+int _kvm_getcsr(struct kvm_vcpu *vcpu, unsigned int id, u64 *v);
+int _kvm_setcsr(struct kvm_vcpu *vcpu, unsigned int id, u64 v);
+
+int _kvm_emu_iocsr(larch_inst inst, struct kvm_run *run, struct kvm_vcpu *vcpu);
+
+static inline void kvm_save_hw_gcsr(struct loongarch_csrs *csr, int gid)
+{
+	csr->csrs[gid] = gcsr_read(gid);
+}
+
+static inline void kvm_restore_hw_gcsr(struct loongarch_csrs *csr, int gid)
+{
+	gcsr_write(csr->csrs[gid], gid);
+}
+
+static inline unsigned long kvm_read_sw_gcsr(struct loongarch_csrs *csr, int gid)
+{
+	return csr->csrs[gid];
+}
+
+static inline void kvm_write_sw_gcsr(struct loongarch_csrs *csr, int gid, unsigned long val)
+{
+	csr->csrs[gid] = val;
+}
+
+static inline void kvm_set_sw_gcsr(struct loongarch_csrs *csr, int gid, unsigned long val)
+{
+	csr->csrs[gid] |= val;
+}
+
+static inline void kvm_change_sw_gcsr(struct loongarch_csrs *csr, int gid, unsigned long mask,
+	unsigned long val)
+{
+	unsigned long _mask = mask;
+
+	csr->csrs[gid] &= ~_mask;
+	csr->csrs[gid] |= val & _mask;
+}
+#endif	/* __ASM_LOONGARCH_KVM_CSR_H__ */
diff --git a/arch/loongarch/kvm/exit.c b/arch/loongarch/kvm/exit.c
new file mode 100644
index 000000000000..dcb8eb815b74
--- /dev/null
+++ b/arch/loongarch/kvm/exit.c
@@ -0,0 +1,100 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020-2023 Loongson Technology Corporation Limited
+ */
+
+#include <linux/errno.h>
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/preempt.h>
+#include <linux/vmalloc.h>
+#include <asm/fpu.h>
+#include <asm/inst.h>
+#include <asm/time.h>
+#include <asm/tlb.h>
+#include <asm/loongarch.h>
+#include <asm/numa.h>
+#include <asm/kvm_vcpu.h>
+#include <asm/kvm_csr.h>
+#include <linux/kvm_host.h>
+#include <asm/mmzone.h>
+
+#define CREATE_TRACE_POINTS
+#include "trace.h"
+
+static unsigned long _kvm_emu_read_csr(struct kvm_vcpu *vcpu, int csrid)
+{
+	struct loongarch_csrs *csr = vcpu->arch.csr;
+	unsigned long val = 0;
+
+	if (csrid < 4096 && (get_gcsr_flag(csrid) & SW_GCSR))
+		val = kvm_read_sw_gcsr(csr, csrid);
+	else
+		pr_warn_once("Unsupport csrread 0x%x with pc %lx\n",
+			csrid, vcpu->arch.pc);
+	return val;
+}
+
+static void _kvm_emu_write_csr(struct kvm_vcpu *vcpu, int csrid,
+	unsigned long val)
+{
+	struct loongarch_csrs *csr = vcpu->arch.csr;
+
+	if (csrid < 4096 && (get_gcsr_flag(csrid) & SW_GCSR))
+		kvm_write_sw_gcsr(csr, csrid, val);
+	else
+		pr_warn_once("Unsupport csrwrite 0x%x with pc %lx\n",
+				csrid, vcpu->arch.pc);
+}
+
+static void _kvm_emu_xchg_csr(struct kvm_vcpu *vcpu, int csrid,
+	unsigned long csr_mask, unsigned long val)
+{
+	struct loongarch_csrs *csr = vcpu->arch.csr;
+
+	if (csrid < 4096 && (get_gcsr_flag(csrid) & SW_GCSR)) {
+		unsigned long orig;
+
+		orig = kvm_read_sw_gcsr(csr, csrid);
+		orig &= ~csr_mask;
+		orig |= val & csr_mask;
+		kvm_write_sw_gcsr(csr, csrid, orig);
+	} else
+		pr_warn_once("Unsupport csrxchg 0x%x with pc %lx\n",
+				csrid, vcpu->arch.pc);
+}
+
+static int _kvm_handle_csr(struct kvm_vcpu *vcpu, larch_inst inst)
+{
+	unsigned int rd, rj, csrid;
+	unsigned long csr_mask;
+	unsigned long val = 0;
+
+	/*
+	 * CSR value mask imm
+	 * rj = 0 means csrrd
+	 * rj = 1 means csrwr
+	 * rj != 0,1 means csrxchg
+	 */
+	rd = inst.reg2csr_format.rd;
+	rj = inst.reg2csr_format.rj;
+	csrid = inst.reg2csr_format.csr;
+
+	/* Process CSR ops */
+	if (rj == 0) {
+		/* process csrrd */
+		val = _kvm_emu_read_csr(vcpu, csrid);
+		vcpu->arch.gprs[rd] = val;
+	} else if (rj == 1) {
+		/* process csrwr */
+		val = vcpu->arch.gprs[rd];
+		_kvm_emu_write_csr(vcpu, csrid, val);
+	} else {
+		/* process csrxchg */
+		val = vcpu->arch.gprs[rd];
+		csr_mask = vcpu->arch.gprs[rj];
+		_kvm_emu_xchg_csr(vcpu, csrid, csr_mask, val);
+	}
+
+	return EMULATE_DONE;
+}
-- 
2.31.1