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Message-Id: <20230927030959.3629941-17-zhaotianrui@loongson.cn>
Date: Wed, 27 Sep 2023 11:09:50 +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,
Huacai Chen <chenhuacai@...ngson.cn>
Subject: [PATCH v22 16/25] LoongArch: KVM: Implement handle iocsr exception
Implement kvm handle vcpu iocsr exception, setting the iocsr info into
vcpu_run and return to user space to handle it.
Reviewed-by: Bibo Mao <maobibo@...ngson.cn>
Tested-by: Huacai Chen <chenhuacai@...ngson.cn>
Signed-off-by: Tianrui Zhao <zhaotianrui@...ngson.cn>
---
arch/loongarch/include/asm/inst.h | 16 ++++++
arch/loongarch/kvm/exit.c | 91 +++++++++++++++++++++++++++++++
2 files changed, 107 insertions(+)
diff --git a/arch/loongarch/include/asm/inst.h b/arch/loongarch/include/asm/inst.h
index 71e1ed4165..008a88ead6 100644
--- a/arch/loongarch/include/asm/inst.h
+++ b/arch/loongarch/include/asm/inst.h
@@ -65,6 +65,14 @@ enum reg2_op {
revbd_op = 0x0f,
revh2w_op = 0x10,
revhd_op = 0x11,
+ iocsrrdb_op = 0x19200,
+ iocsrrdh_op = 0x19201,
+ iocsrrdw_op = 0x19202,
+ iocsrrdd_op = 0x19203,
+ iocsrwrb_op = 0x19204,
+ iocsrwrh_op = 0x19205,
+ iocsrwrw_op = 0x19206,
+ iocsrwrd_op = 0x19207,
};
enum reg2i5_op {
@@ -318,6 +326,13 @@ struct reg2bstrd_format {
unsigned int opcode : 10;
};
+struct reg2csr_format {
+ unsigned int rd : 5;
+ unsigned int rj : 5;
+ unsigned int csr : 14;
+ unsigned int opcode : 8;
+};
+
struct reg3_format {
unsigned int rd : 5;
unsigned int rj : 5;
@@ -346,6 +361,7 @@ union loongarch_instruction {
struct reg2i14_format reg2i14_format;
struct reg2i16_format reg2i16_format;
struct reg2bstrd_format reg2bstrd_format;
+ struct reg2csr_format reg2csr_format;
struct reg3_format reg3_format;
struct reg3sa2_format reg3sa2_format;
};
diff --git a/arch/loongarch/kvm/exit.c b/arch/loongarch/kvm/exit.c
index 37bc8a4209..7e729dd9e9 100644
--- a/arch/loongarch/kvm/exit.c
+++ b/arch/loongarch/kvm/exit.c
@@ -103,3 +103,94 @@ static int kvm_handle_csr(struct kvm_vcpu *vcpu, larch_inst inst)
return EMULATE_DONE;
}
+
+int kvm_emu_iocsr(larch_inst inst, struct kvm_run *run, struct kvm_vcpu *vcpu)
+{
+ int ret;
+ unsigned long val;
+ u32 addr, rd, rj, opcode;
+
+ /*
+ * Each IOCSR with different opcode
+ */
+ rd = inst.reg2_format.rd;
+ rj = inst.reg2_format.rj;
+ opcode = inst.reg2_format.opcode;
+ addr = vcpu->arch.gprs[rj];
+ ret = EMULATE_DO_IOCSR;
+ run->iocsr_io.phys_addr = addr;
+ run->iocsr_io.is_write = 0;
+
+ /* LoongArch is Little endian */
+ switch (opcode) {
+ case iocsrrdb_op:
+ run->iocsr_io.len = 1;
+ break;
+ case iocsrrdh_op:
+ run->iocsr_io.len = 2;
+ break;
+ case iocsrrdw_op:
+ run->iocsr_io.len = 4;
+ break;
+ case iocsrrdd_op:
+ run->iocsr_io.len = 8;
+ break;
+ case iocsrwrb_op:
+ run->iocsr_io.len = 1;
+ run->iocsr_io.is_write = 1;
+ break;
+ case iocsrwrh_op:
+ run->iocsr_io.len = 2;
+ run->iocsr_io.is_write = 1;
+ break;
+ case iocsrwrw_op:
+ run->iocsr_io.len = 4;
+ run->iocsr_io.is_write = 1;
+ break;
+ case iocsrwrd_op:
+ run->iocsr_io.len = 8;
+ run->iocsr_io.is_write = 1;
+ break;
+ default:
+ ret = EMULATE_FAIL;
+ break;
+ }
+
+ if (ret == EMULATE_DO_IOCSR) {
+ if (run->iocsr_io.is_write) {
+ val = vcpu->arch.gprs[rd];
+ memcpy(run->iocsr_io.data, &val, run->iocsr_io.len);
+ }
+ vcpu->arch.io_gpr = rd;
+ }
+
+ return ret;
+}
+
+int kvm_complete_iocsr_read(struct kvm_vcpu *vcpu, struct kvm_run *run)
+{
+ enum emulation_result er = EMULATE_DONE;
+ unsigned long *gpr = &vcpu->arch.gprs[vcpu->arch.io_gpr];
+
+ switch (run->iocsr_io.len) {
+ case 1:
+ *gpr = *(s8 *)run->iocsr_io.data;
+ break;
+ case 2:
+ *gpr = *(s16 *)run->iocsr_io.data;
+ break;
+ case 4:
+ *gpr = *(s32 *)run->iocsr_io.data;
+ break;
+ case 8:
+ *gpr = *(s64 *)run->iocsr_io.data;
+ break;
+ default:
+ kvm_err("Bad IOCSR length: %d, addr is 0x%lx\n",
+ run->iocsr_io.len, vcpu->arch.badv);
+ er = EMULATE_FAIL;
+ break;
+ }
+
+ return er;
+}
--
2.39.3
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