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LoongArch KVM changes for v6.7

Browse source 
Add LoongArch's KVM support. Loongson 3A5000/3A6000 supports hardware
 assisted virtualization. With cpu virtualization, there are separate
 hw-supported user mode and kernel mode in guest mode. With memory
 virtualization, there are two-level hw mmu table for guest mode and host
 mode. Also there is separate hw cpu timer with consant frequency in
 guest mode, so that vm can migrate between hosts with different freq.
 Currently, we are able to boot LoongArch Linux Guests.
 
 Few key aspects of KVM LoongArch added by this series are:
 1. Enable kvm hardware function when kvm module is loaded.
 2. Implement VM and vcpu related ioctl interface such as vcpu create,
    vcpu run etc. GET_ONE_REG/SET_ONE_REG ioctl commands are use to
    get general registers one by one.
 3. Hardware access about MMU, timer and csr are emulated in kernel.
 4. Hardwares such as mmio and iocsr device are emulated in user space
    such as IPI, irqchips, pci devices etc.
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Merge tag 'loongarch-kvm-6.7' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson into HEAD

LoongArch KVM changes for v6.7

Add LoongArch's KVM support. Loongson 3A5000/3A6000 supports hardware
assisted virtualization. With cpu virtualization, there are separate
hw-supported user mode and kernel mode in guest mode. With memory
virtualization, there are two-level hw mmu table for guest mode and host
mode. Also there is separate hw cpu timer with consant frequency in
guest mode, so that vm can migrate between hosts with different freq.
Currently, we are able to boot LoongArch Linux Guests.

Few key aspects of KVM LoongArch added by this series are:
1. Enable kvm hardware function when kvm module is loaded.
2. Implement VM and vcpu related ioctl interface such as vcpu create,
   vcpu run etc. GET_ONE_REG/SET_ONE_REG ioctl commands are use to
   get general registers one by one.
3. Hardware access about MMU, timer and csr are emulated in kernel.
4. Hardwares such as mmio and iocsr device are emulated in user space
   such as IPI, irqchips, pci devices etc.
This commit is contained in:
Paolo Bonzini 2023-10-31 09:55:40 -04:00
commit ef12ea629e
27 changed files with 4902 additions and 14 deletions
Download patch file Download diff file Expand all files Collapse all files

9
include/uapi/linux/kvm.h
View file

@ -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;
@ -1362,6 +1370,7 @@ 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