[PATCH RFC v2 1/9] linux-headers: Add KVM headers for loongarch

[Tianrui Zhao]

This patch is only a placeholder now, which is used to
show some kvm structures and macros for reviewers.
And it will be replaced by using update-linux-headers.sh
when the linux loongarch kvm patches are accepted.

Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
---
 linux-headers/asm-loongarch/kvm.h | 99 +++++++++++++++++++++++++++++++
 linux-headers/linux/kvm.h         |  9 +++
 2 files changed, 108 insertions(+)
 create mode 100644 linux-headers/asm-loongarch/kvm.h

diff --git a/linux-headers/asm-loongarch/kvm.h 
b/linux-headers/asm-loongarch/kvm.h
new file mode 100644
index 0000000000..6420f59f9e
--- /dev/null
+++ b/linux-headers/asm-loongarch/kvm.h
@@ -0,0 +1,99 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/*
+ * Copyright (C) 2023 Loongson Technology Corporation Limited
+ */
+
+#ifndef __UAPI_ASM_LOONGARCH_KVM_H
+#define __UAPI_ASM_LOONGARCH_KVM_H
+
+#include <linux/types.h>
+
+/*
+ * KVM Loongarch specific structures and definitions.
+ */
+
+#define __KVM_HAVE_READONLY_MEM
+
+#define KVM_COALESCED_MMIO_PAGE_OFFSET 1
+
+/*
+ * for KVM_GET_REGS and KVM_SET_REGS
+ */
+struct kvm_regs {
+       /* out (KVM_GET_REGS) / in (KVM_SET_REGS) */
+       __u64 gpr[32];
+       __u64 pc;
+};
+
+/*
+ * for KVM_GET_FPU and KVM_SET_FPU
+ */
+struct kvm_fpu {
+       __u32 fcsr;
+       __u32 none;
+       __u64 fcc;    /* 8x8 */
+       struct kvm_fpureg {
+               __u64 val64[4];
+       } fpr[32];
+};
+
+/*
+ * For LoongArch, we use KVM_SET_ONE_REG and KVM_GET_ONE_REG to access various
+ * registers.  The id field is broken down as follows:
+ *
+ *  bits[63..52] - As per linux/kvm.h
+ *  bits[51..32] - Must be zero.
+ *  bits[31..16] - Register set.
+ *
+ * Register set = 0: GP registers from kvm_regs (see definitions below).
+ *
+ * Register set = 1: CSR registers.
+ *
+ * Register set = 2: KVM specific registers (see definitions below).
+ *
+ * Register set = 3: FPU / SIMD registers (see definitions below).
+ *
+ * Other sets registers may be added in the future.  Each set would
+ * have its own identifier in bits[31..16].
+ */
+
+#define KVM_REG_LOONGARCH_GP           (KVM_REG_LOONGARCH | 0x00000ULL)
+#define KVM_REG_LOONGARCH_CSR          (KVM_REG_LOONGARCH | 0x10000ULL)
+#define KVM_REG_LOONGARCH_KVM          (KVM_REG_LOONGARCH | 0x20000ULL)
+#define KVM_REG_LOONGARCH_FPU          (KVM_REG_LOONGARCH | 0x30000ULL)
+#define KVM_REG_LOONGARCH_MASK         (KVM_REG_LOONGARCH | 0x30000ULL)
+#define KVM_CSR_IDX_MASK               (0x10000 - 1)
+
+/*
+ * KVM_REG_LOONGARCH_KVM - KVM specific control registers.
+ */
+
+#define KVM_REG_LOONGARCH_COUNTER      (KVM_REG_LOONGARCH_KVM | 
KVM_REG_SIZE_U64 | 3)
+#define KVM_REG_LOONGARCH_VCPU_RESET   (KVM_REG_LOONGARCH_KVM | 
KVM_REG_SIZE_U64 | 4)
+
+struct kvm_debug_exit_arch {
+};
+
+/* for KVM_SET_GUEST_DEBUG */
+struct kvm_guest_debug_arch {
+};
+
+/* definition of registers in kvm_run */
+struct kvm_sync_regs {
+};
+
+/* dummy definition */
+struct kvm_sregs {
+};
+
+struct kvm_loongarch_interrupt {
+       /* in */
+       __u32 cpu;
+       __u32 irq;
+};
+
+#define KVM_NR_IRQCHIPS                1
+#define KVM_IRQCHIP_NUM_PINS   64
+#define KVM_MAX_CORES          256
+
+#endif /* __UAPI_ASM_LOONGARCH_KVM_H */
diff --git a/linux-headers/linux/kvm.h b/linux-headers/linux/kvm.h
index 1e2c16cfe3..8d72bb6810 100644
--- a/linux-headers/linux/kvm.h
+++ b/linux-headers/linux/kvm.h
@@ -264,6 +264,7 @@ struct kvm_xen_exit {
 #define KVM_EXIT_RISCV_SBI        35
 #define KVM_EXIT_RISCV_CSR        36
 #define KVM_EXIT_NOTIFY           37
+#define KVM_EXIT_LOONGARCH_IOCSR  38
 
 /* For KVM_EXIT_INTERNAL_ERROR */
 /* Emulate instruction failed. */
@@ -336,6 +337,13 @@ struct kvm_run {
                        __u32 len;
                        __u8  is_write;
                } mmio;
+               /* KVM_EXIT_LOONGARCH_IOCSR */
+               struct {
+                       __u64 phys_addr;
+                       __u8  data[8];
+                       __u32 len;
+                       __u8  is_write;
+               } iocsr_io;
                /* KVM_EXIT_HYPERCALL */
                struct {
                        __u64 nr;
@@ -1343,6 +1351,7 @@ struct kvm_dirty_tlb {
 #define KVM_REG_ARM64          0x6000000000000000ULL
 #define KVM_REG_MIPS           0x7000000000000000ULL
 #define KVM_REG_RISCV          0x8000000000000000ULL
+#define KVM_REG_LOONGARCH      0x9000000000000000ULL
 
 #define KVM_REG_SIZE_SHIFT     52
 #define KVM_REG_SIZE_MASK      0x00f0000000000000ULL
-- 
2.31.1