[PATCH v13 20/30] LoongArch: KVM: Implement handle csr excption

From: Tianrui Zhao <zhaotianrui@loongson.cn>
To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Cc: Paolo Bonzini <pbonzini@redhat.com>,
	Huacai Chen <chenhuacai@kernel.org>,
	WANG Xuerui <kernel@xen0n.name>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	loongarch@lists.linux.dev, 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, tangyouling@loongson.cn
Subject: [PATCH v13 20/30] LoongArch: KVM: Implement handle csr excption
Date: Fri,  9 Jun 2023 17:05:08 +0800	[thread overview]
Message-ID: <20230609090518.2130926-21-zhaotianrui@loongson.cn> (raw)
In-Reply-To: <20230609090518.2130926-1-zhaotianrui@loongson.cn>

Implement kvm handle LoongArch vcpu exit caused by reading and
writing csr. Using csr structure to emulate the registers.

Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
---
 arch/loongarch/kvm/exit.c | 98 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 98 insertions(+)
 create mode 100644 arch/loongarch/kvm/exit.c

diff --git a/arch/loongarch/kvm/exit.c b/arch/loongarch/kvm/exit.c
new file mode 100644
index 000000000000..18635333fc9a
--- /dev/null
+++ b/arch/loongarch/kvm/exit.c
@@ -0,0 +1,98 @@
+// 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>
+#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 (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 (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 (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;
+}
-- 
2.39.1

