[V4,00/14] KVM: MIPS: Add Loongson-3 support (Host Side)

Message

Huacai Chen May 12, 2020, 10:31 a.m. UTC

We are preparing to add KVM support for Loongson-3. VZ extension is
fully supported in Loongson-3A R4+, and we will not care about old CPUs
(at least now). We already have a full functional Linux kernel (based
on Linux-5.4.x LTS) and QEMU (based on 5.0.0-rc2) and their git
repositories are here:

QEMU: https://github.com/chenhuacai/qemu
Kernel: https://github.com/chenhuacai/linux

Of course these two repositories need to be rework and not suitable for
upstream (especially the commits need to be splitted). We show them here
is just to tell others what we have done, and how KVM/Loongson will look
like.

Our plan is make the KVM host side be upstream first, and after that,
we will make the KVM guest side and QEMU emulator be upstream.

V1 -> V2:
1, Remove "mips: define pud_index() regardless of page table folding"
   because it has been applied.
2, Make Loongson-specific code be guarded by CONFIG_CPU_LOONGSON64.

V2 -> V3:
1, Emulate a reduced feature list of CPUCFG.
2, Fix all possible checkpatch.pl errors and warnings.

V3 -> V4:
1, Emulate LOONGSON_CFG0/LOONGSON_CFG3 in CPUCFG correctly.
2, Update commit messages to explain Loongson-3 Virtual IPI.
3, Add Reviewed-by: Aleksandar Markovic <[e-mail]>.

Xing Li(2):
 KVM: MIPS: Define KVM_ENTRYHI_ASID to cpu_asid_mask(&boot_cpu_data)
 KVM: MIPS: Fix VPN2_MASK definition for variable cpu_vmbits

Huacai Chen(12):
 KVM: MIPS: Increase KVM_MAX_VCPUS and KVM_USER_MEM_SLOTS to 16
 KVM: MIPS: Add EVENTFD support which is needed by VHOST
 KVM: MIPS: Use lddir/ldpte instructions to lookup gpa_mm.pgd
 KVM: MIPS: Introduce and use cpu_guest_has_ldpte
 KVM: MIPS: Use root tlb to control guest's CCA for Loongson-3
 KVM: MIPS: Let indexed cacheops cause guest exit on Loongson-3
 KVM: MIPS: Add more types of virtual interrupts
 KVM: MIPS: Add Loongson-3 Virtual IPI interrupt support
 KVM: MIPS: Add CPUCFG emulation for Loongson-3
 KVM: MIPS: Add CONFIG6 and DIAG registers emulation
 KVM: MIPS: Add more MMIO load/store instructions emulation
 KVM: MIPS: Enable KVM support for Loongson-3

Signed-off-by: Huacai Chen <[e-mail]>
---
 arch/mips/Kconfig                    |   1 +
 arch/mips/include/asm/cpu-features.h |   3 +
 arch/mips/include/asm/kvm_host.h     |  52 +++-
 arch/mips/include/asm/mipsregs.h     |   7 +
 arch/mips/include/uapi/asm/inst.h    |  11 +
 arch/mips/kernel/cpu-probe.c         |   2 +
 arch/mips/kvm/Kconfig                |   1 +
 arch/mips/kvm/Makefile               |   5 +-
 arch/mips/kvm/emulate.c              | 503 ++++++++++++++++++++++++++++++++++-
 arch/mips/kvm/entry.c                |  19 +-
 arch/mips/kvm/interrupt.c            |  93 +------
 arch/mips/kvm/interrupt.h            |  14 +-
 arch/mips/kvm/loongson_ipi.c         | 214 +++++++++++++++
 arch/mips/kvm/mips.c                 |  49 +++-
 arch/mips/kvm/tlb.c                  |  41 +++
 arch/mips/kvm/trap_emul.c            |   3 +
 arch/mips/kvm/vz.c                   | 237 ++++++++++++-----
 17 files changed, 1089 insertions(+), 166 deletions(-)
 create mode 100644 arch/mips/kvm/loongson_ipi.c
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2.7.0