* [PATCH v1 00/24] Add KVM LoongArch support
@ 2023-02-14 2:56 Tianrui Zhao
2023-02-14 2:56 ` [PATCH v1 01/24] LoongArch: KVM: Implement kvm module related interface Tianrui Zhao
` (23 more replies)
0 siblings, 24 replies; 36+ messages in thread
From: Tianrui Zhao @ 2023-02-14 2:56 UTC (permalink / raw)
To: Paolo Bonzini
Cc: Huacai Chen, WANG Xuerui, Greg Kroah-Hartman, loongarch,
linux-kernel, kvm, Jens Axboe, Mark Brown, Alex Deucher
This series adds KVM LoongArch support. Loongson 3A5000 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; KVM_GET_CSRS can be used to
get system registers with batch mode similar with KVM_GET_MSRS in x86.
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 APIC, IPI, pci devices etc.
The running environment of LoongArch virt machine:
1. Cross tools to build kernel and uefi:
$ wget https://github.com/loongson/build-tools/releases/download/2022.09.06/loongarch64-clfs-6.3-cross-tools-gcc-glibc.tar.xz
tar -vxf loongarch64-clfs-6.3-cross-tools-gcc-glibc.tar.xz -C /opt
export PATH=/opt/cross-tools/bin:$PATH
export LD_LIBRARY_PATH=/opt/cross-tools/lib:$LD_LIBRARY_PATH
export LD_LIBRARY_PATH=/opt/cross-tools/loongarch64-unknown-linux-gnu/lib/:$LD_LIBRARY_PATH
2. This series is based on the linux source code:
https://github.com/loongson/linux-loongarch-kvm
Build command:
git checkout kvm-loongarch
make ARCH=loongarch CROSS_COMPILE=loongarch64-unknown-linux-gnu- loongson3_defconfig
make ARCH=loongarch CROSS_COMPILE=loongarch64-unknown-linux-gnu-
3. QEMU hypervisor with LoongArch supported:
https://github.com/loongson/qemu
Build command:
git checkout kvm-loongarch
./configure --target-list="loongarch64-softmmu" --enable-kvm
make
4. Uefi bios of LoongArch virt machine:
Reference: https://github.com/tianocore/edk2-platforms/tree/master/Platform/Loongson/LoongArchQemuPkg#readme
5. you can also access the binary files we have already build:
https://github.com/yangxiaojuan-loongson/qemu-binary
The command to boot loongarch virt machine:
$ qemu-system-loongarch64 -machine virt -m 4G -cpu la464 \
-smp 1 -bios QEMU_EFI.fd -kernel vmlinuz.efi -initrd ramdisk \
-serial stdio -monitor telnet:localhost:4495,server,nowait \
-append "root=/dev/ram rdinit=/sbin/init console=ttyS0,115200" \
--nographic
Tianrui Zhao (24):
LoongArch: KVM: Implement kvm module related interface
LoongArch: KVM: Implement VM related functions
LoongArch: KVM: Implement vcpu create,run,destroy operations.
LoongArch: KVM: Implement vcpu get, vcpu set registers
LoongArch: KVM: Implement vcpu ENABLE_CAP, CHECK_EXTENSION ioctl
interface
LoongArch: KVM: Implement fpu related operations for vcpu
LoongArch: KVM: Implement vcpu interrupt operations
LoongArch: KVM: Implement misc vcpu related interfaces
LoongArch: KVM: Implement vcpu load and vcpu put operations
LoongArch: KVM: Implement vcpu status description
LoongArch: KVM: Implement update VM id function
LoongArch: KVM: Implement virtual machine tlb operations
LoongArch: KVM: Implement vcpu timer operations
LoongArch: KVM: Implement kvm mmu operations
LoongArch: KVM: Implement handle csr excption
LoongArch: KVM: Implement handle iocsr exception
LoongArch: KVM: Implement handle idle exception
LoongArch: KVM: Implement handle gspr exception
LoongArch: KVM: Implement handle mmio exception
LoongArch: KVM: Implement handle fpu exception
LoongArch: KVM: Implement kvm exception vector
LoongArch: KVM: Implement vcpu world switch
LoongArch: KVM: Implement probe virtualization when loongarch cpu init
LoongArch: KVM: Enable kvm config and add the makefile
arch/loongarch/Kbuild | 1 +
arch/loongarch/Kconfig | 2 +
arch/loongarch/configs/loongson3_defconfig | 2 +
arch/loongarch/include/asm/cpu-features.h | 22 +
arch/loongarch/include/asm/cpu-info.h | 13 +
arch/loongarch/include/asm/inst.h | 16 +
arch/loongarch/include/asm/kvm_csr.h | 89 ++
arch/loongarch/include/asm/kvm_host.h | 257 +++++
arch/loongarch/include/asm/kvm_types.h | 11 +
arch/loongarch/include/asm/kvm_vcpu.h | 112 ++
arch/loongarch/include/asm/loongarch.h | 195 +++-
arch/loongarch/include/uapi/asm/kvm.h | 121 ++
arch/loongarch/kernel/asm-offsets.c | 32 +
arch/loongarch/kernel/cpu-probe.c | 53 +
arch/loongarch/kvm/Kconfig | 38 +
arch/loongarch/kvm/Makefile | 21 +
arch/loongarch/kvm/exit.c | 702 ++++++++++++
arch/loongarch/kvm/interrupt.c | 126 +++
arch/loongarch/kvm/main.c | 152 +++
arch/loongarch/kvm/mmu.c | 821 ++++++++++++++
arch/loongarch/kvm/switch.S | 327 ++++++
arch/loongarch/kvm/timer.c | 266 +++++
arch/loongarch/kvm/tlb.c | 31 +
arch/loongarch/kvm/trace.h | 137 +++
arch/loongarch/kvm/vcpu.c | 1185 ++++++++++++++++++++
arch/loongarch/kvm/vm.c | 85 ++
arch/loongarch/kvm/vmid.c | 64 ++
include/uapi/linux/kvm.h | 15 +
28 files changed, 4890 insertions(+), 6 deletions(-)
create mode 100644 arch/loongarch/include/asm/kvm_csr.h
create mode 100644 arch/loongarch/include/asm/kvm_host.h
create mode 100644 arch/loongarch/include/asm/kvm_types.h
create mode 100644 arch/loongarch/include/asm/kvm_vcpu.h
create mode 100644 arch/loongarch/include/uapi/asm/kvm.h
create mode 100644 arch/loongarch/kvm/Kconfig
create mode 100644 arch/loongarch/kvm/Makefile
create mode 100644 arch/loongarch/kvm/exit.c
create mode 100644 arch/loongarch/kvm/interrupt.c
create mode 100644 arch/loongarch/kvm/main.c
create mode 100644 arch/loongarch/kvm/mmu.c
create mode 100644 arch/loongarch/kvm/switch.S
create mode 100644 arch/loongarch/kvm/timer.c
create mode 100644 arch/loongarch/kvm/tlb.c
create mode 100644 arch/loongarch/kvm/trace.h
create mode 100644 arch/loongarch/kvm/vcpu.c
create mode 100644 arch/loongarch/kvm/vm.c
create mode 100644 arch/loongarch/kvm/vmid.c
--
2.31.1
^ permalink raw reply [flat|nested] 36+ messages in thread
* [PATCH v1 01/24] LoongArch: KVM: Implement kvm module related interface
2023-02-14 2:56 [PATCH v1 00/24] Add KVM LoongArch support Tianrui Zhao
@ 2023-02-14 2:56 ` Tianrui Zhao
2023-02-14 6:38 ` Greg Kroah-Hartman
2023-02-14 2:56 ` [PATCH v1 02/24] LoongArch: KVM: Implement VM related functions Tianrui Zhao
` (22 subsequent siblings)
23 siblings, 1 reply; 36+ messages in thread
From: Tianrui Zhao @ 2023-02-14 2:56 UTC (permalink / raw)
To: Paolo Bonzini
Cc: Huacai Chen, WANG Xuerui, Greg Kroah-Hartman, loongarch,
linux-kernel, kvm, Jens Axboe, Mark Brown, Alex Deucher
1. Implement loongarch kvm module init, module exit interface,
using kvm context to save the vpid info and vcpu world switch
interface pointer.
2. Implement kvm hardware enable, disable interface, setting
the guest config reg to enable virtualization features.
3. Add kvm related headers.
Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
---
arch/loongarch/include/asm/cpu-features.h | 22 ++
arch/loongarch/include/asm/kvm_host.h | 257 ++++++++++++++++++++++
arch/loongarch/include/asm/kvm_types.h | 11 +
arch/loongarch/include/uapi/asm/kvm.h | 121 ++++++++++
arch/loongarch/kvm/main.c | 152 +++++++++++++
include/uapi/linux/kvm.h | 15 ++
6 files changed, 578 insertions(+)
create mode 100644 arch/loongarch/include/asm/kvm_host.h
create mode 100644 arch/loongarch/include/asm/kvm_types.h
create mode 100644 arch/loongarch/include/uapi/asm/kvm.h
create mode 100644 arch/loongarch/kvm/main.c
diff --git a/arch/loongarch/include/asm/cpu-features.h b/arch/loongarch/include/asm/cpu-features.h
index b07974218..23e7c3ae5 100644
--- a/arch/loongarch/include/asm/cpu-features.h
+++ b/arch/loongarch/include/asm/cpu-features.h
@@ -64,5 +64,27 @@
#define cpu_has_guestid cpu_opt(LOONGARCH_CPU_GUESTID)
#define cpu_has_hypervisor cpu_opt(LOONGARCH_CPU_HYPERVISOR)
+#define cpu_has_matc_guest (cpu_data[0].guest_cfg & (1 << 0))
+#define cpu_has_matc_root (cpu_data[0].guest_cfg & (1 << 1))
+#define cpu_has_matc_nest (cpu_data[0].guest_cfg & (1 << 2))
+#define cpu_has_sitp (cpu_data[0].guest_cfg & (1 << 6))
+#define cpu_has_titp (cpu_data[0].guest_cfg & (1 << 8))
+#define cpu_has_toep (cpu_data[0].guest_cfg & (1 << 10))
+#define cpu_has_topp (cpu_data[0].guest_cfg & (1 << 12))
+#define cpu_has_torup (cpu_data[0].guest_cfg & (1 << 14))
+#define cpu_has_gcip_all (cpu_data[0].guest_cfg & (1 << 16))
+#define cpu_has_gcip_hit (cpu_data[0].guest_cfg & (1 << 17))
+#define cpu_has_gcip_secure (cpu_data[0].guest_cfg & (1 << 18))
+
+/*
+ * Guest capabilities
+ */
+#define cpu_guest_has_conf1 (cpu_data[0].guest.conf & (1 << 1))
+#define cpu_guest_has_conf2 (cpu_data[0].guest.conf & (1 << 2))
+#define cpu_guest_has_conf3 (cpu_data[0].guest.conf & (1 << 3))
+#define cpu_guest_has_fpu (cpu_data[0].guest.options & LOONGARCH_CPU_FPU)
+#define cpu_guest_has_perf (cpu_data[0].guest.options & LOONGARCH_CPU_PMP)
+#define cpu_guest_has_watch (cpu_data[0].guest.options & LOONGARCH_CPU_WATCH)
+#define cpu_guest_has_lsx (cpu_data[0].guest.ases & LOONGARCH_ASE_LSX)
#endif /* __ASM_CPU_FEATURES_H */
diff --git a/arch/loongarch/include/asm/kvm_host.h b/arch/loongarch/include/asm/kvm_host.h
new file mode 100644
index 000000000..fa464e476
--- /dev/null
+++ b/arch/loongarch/include/asm/kvm_host.h
@@ -0,0 +1,257 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020-2023 Loongson Technology Corporation Limited
+ */
+
+#ifndef __ASM_LOONGARCH_KVM_HOST_H__
+#define __ASM_LOONGARCH_KVM_HOST_H__
+
+#include <linux/cpumask.h>
+#include <linux/mutex.h>
+#include <linux/hrtimer.h>
+#include <linux/interrupt.h>
+#include <linux/types.h>
+#include <linux/kvm.h>
+#include <linux/kvm_types.h>
+#include <linux/threads.h>
+#include <linux/spinlock.h>
+
+#include <asm/inst.h>
+#include <asm/loongarch.h>
+
+/* Loongarch KVM register ids */
+#define LOONGARCH_CSR_32(_R, _S) \
+ (KVM_REG_LOONGARCH_CSR | KVM_REG_SIZE_U32 | (8 * (_R) + (_S)))
+
+#define LOONGARCH_CSR_64(_R, _S) \
+ (KVM_REG_LOONGARCH_CSR | KVM_REG_SIZE_U64 | (8 * (_R) + (_S)))
+
+#define KVM_IOC_CSRID(id) LOONGARCH_CSR_64(id, 0)
+#define KVM_GET_IOC_CSRIDX(id) ((id & KVM_CSR_IDX_MASK) >> 3)
+
+#define KVM_MAX_VCPUS 256
+/* memory slots that does not exposed to userspace */
+#define KVM_PRIVATE_MEM_SLOTS 0
+
+#define KVM_HALT_POLL_NS_DEFAULT 500000
+
+struct kvm_vm_stat {
+ struct kvm_vm_stat_generic generic;
+};
+
+struct kvm_vcpu_stat {
+ struct kvm_vcpu_stat_generic generic;
+ u64 idle_exits;
+ u64 signal_exits;
+ u64 int_exits;
+ u64 cpucfg_exits;
+};
+
+struct kvm_arch_memory_slot {
+};
+
+struct kvm_context {
+ unsigned long vpid_mask;
+ unsigned long vpid_cache;
+ void *kvm_eentry;
+ void *kvm_enter_guest;
+ unsigned long page_order;
+ struct kvm_vcpu *last_vcpu;
+};
+
+struct kvm_arch {
+ /* Guest physical mm */
+ struct mm_struct gpa_mm;
+ /* Mask of CPUs needing GPA ASID flush */
+ cpumask_t asid_flush_mask;
+
+ unsigned char online_vcpus;
+ unsigned char is_migrate;
+ s64 time_offset;
+ struct kvm_context __percpu *vmcs;
+};
+
+
+#define LOONGARCH_CSRS 0x100
+#define CSR_UCWIN_BASE 0x100
+#define CSR_UCWIN_SIZE 0x10
+#define CSR_DMWIN_BASE 0x180
+#define CSR_DMWIN_SIZE 0x4
+#define CSR_PERF_BASE 0x200
+#define CSR_PERF_SIZE 0x8
+#define CSR_DEBUG_BASE 0x500
+#define CSR_DEBUG_SIZE 0x3
+#define CSR_ALL_SIZE 0x800
+
+struct loongarch_csrs {
+ unsigned long csrs[CSR_ALL_SIZE];
+};
+
+/* Resume Flags */
+#define RESUME_FLAG_DR (1<<0) /* Reload guest nonvolatile state? */
+#define RESUME_FLAG_HOST (1<<1) /* Resume host? */
+
+#define RESUME_GUEST 0
+#define RESUME_GUEST_DR RESUME_FLAG_DR
+#define RESUME_HOST RESUME_FLAG_HOST
+
+enum emulation_result {
+ EMULATE_DONE, /* no further processing */
+ EMULATE_DO_MMIO, /* kvm_run filled with MMIO request */
+ EMULATE_FAIL, /* can't emulate this instruction */
+ EMULATE_WAIT, /* WAIT instruction */
+ EMULATE_EXCEPT, /* A guest exception has been generated */
+ EMULATE_DO_IOCSR, /* handle IOCSR request */
+};
+
+#define KVM_NR_MEM_OBJS 4
+#define KVM_LARCH_FPU (0x1 << 0)
+
+struct kvm_vcpu_arch {
+ unsigned long guest_eentry;
+ unsigned long host_eentry;
+ int (*vcpu_run)(struct kvm_run *run, struct kvm_vcpu *vcpu);
+ int (*handle_exit)(struct kvm_run *run, struct kvm_vcpu *vcpu);
+
+ /* Host registers preserved across guest mode execution */
+ unsigned long host_stack;
+ unsigned long host_gp;
+ unsigned long host_pgd;
+ unsigned long host_pgdhi;
+ unsigned long host_entryhi;
+
+ /* Host CSR registers used when handling exits from guest */
+ unsigned long badv;
+ unsigned long host_estat;
+ unsigned long badi;
+ unsigned long host_ecfg;
+ unsigned long host_percpu;
+
+ /* GPRS */
+ unsigned long gprs[32];
+ unsigned long pc;
+
+ /* FPU State */
+ struct loongarch_fpu fpu FPU_ALIGN;
+ /* Which auxiliary state is loaded (KVM_LOONGARCH_AUX_*) */
+ unsigned int aux_inuse;
+
+ /* CSR State */
+ struct loongarch_csrs *csr;
+
+ /* GPR used as IO source/target */
+ u32 io_gpr;
+
+ struct hrtimer swtimer;
+ /* Count timer control KVM register */
+ u32 count_ctl;
+
+ /* Bitmask of exceptions that are pending */
+ unsigned long irq_pending;
+ /* Bitmask of pending exceptions to be cleared */
+ unsigned long irq_clear;
+
+ /* Cache some mmu pages needed inside spinlock regions */
+ struct kvm_mmu_memory_cache mmu_page_cache;
+
+ /* vcpu's vpid is different on each host cpu in an smp system */
+ u64 vpid[NR_CPUS];
+
+ /* Period of stable timer tick in ns */
+ u64 timer_period;
+ /* Frequency of stable timer in Hz */
+ u64 timer_mhz;
+ /* Stable bias from the raw time */
+ u64 timer_bias;
+ /* Dynamic nanosecond bias (multiple of timer_period) to avoid overflow */
+ s64 timer_dyn_bias;
+ /* Save ktime */
+ ktime_t stable_ktime_saved;
+
+ u64 core_ext_ioisr[4];
+
+ /* Last CPU the VCPU state was loaded on */
+ int last_sched_cpu;
+ /* Last CPU the VCPU actually executed guest code on */
+ int last_exec_cpu;
+
+ u8 fpu_enabled;
+ struct kvm_guest_debug_arch guest_debug;
+};
+
+static inline unsigned long readl_sw_gcsr(struct loongarch_csrs *csr, int reg)
+{
+ return csr->csrs[reg];
+}
+
+static inline void writel_sw_gcsr(struct loongarch_csrs *csr, int reg,
+ unsigned long val)
+{
+ csr->csrs[reg] = val;
+}
+
+/* Helpers */
+static inline bool _kvm_guest_has_fpu(struct kvm_vcpu_arch *arch)
+{
+ return cpu_has_fpu && arch->fpu_enabled;
+}
+
+void _kvm_init_fault(void);
+
+/* Debug: dump vcpu state */
+int kvm_arch_vcpu_dump_regs(struct kvm_vcpu *vcpu);
+
+/* MMU handling */
+int kvm_handle_mm_fault(struct kvm_vcpu *vcpu, unsigned long badv, bool write);
+void kvm_flush_tlb_all(void);
+void _kvm_destroy_mm(struct kvm *kvm);
+pgd_t *kvm_pgd_alloc(void);
+
+#define KVM_ARCH_WANT_MMU_NOTIFIER
+int kvm_unmap_hva_range(struct kvm *kvm,
+ unsigned long start, unsigned long end, bool blockable);
+void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
+int kvm_age_hva(struct kvm *kvm, unsigned long start, unsigned long end);
+int kvm_test_age_hva(struct kvm *kvm, unsigned long hva);
+
+static inline void update_pc(struct kvm_vcpu_arch *arch)
+{
+ arch->pc += 4;
+}
+
+/**
+ * kvm_is_ifetch_fault() - Find whether a TLBL exception is due to ifetch fault.
+ * @vcpu: Virtual CPU.
+ *
+ * Returns: Whether the TLBL exception was likely due to an instruction
+ * fetch fault rather than a data load fault.
+ */
+static inline bool kvm_is_ifetch_fault(struct kvm_vcpu_arch *arch)
+{
+ if (arch->pc == arch->badv)
+ return true;
+
+ return false;
+}
+
+/* Misc */
+static inline void kvm_arch_hardware_unsetup(void) {}
+static inline void kvm_arch_sync_events(struct kvm *kvm) {}
+static inline void kvm_arch_memslots_updated(struct kvm *kvm, u64 gen) {}
+static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
+static inline void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu) {}
+static inline void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu) {}
+static inline void kvm_arch_vcpu_block_finish(struct kvm_vcpu *vcpu) {}
+static inline void kvm_arch_free_memslot(struct kvm *kvm,
+ struct kvm_memory_slot *slot) {}
+void _kvm_check_vmid(struct kvm_vcpu *vcpu, int cpu);
+enum hrtimer_restart kvm_swtimer_wakeup(struct hrtimer *timer);
+int kvm_flush_tlb_gpa(struct kvm_vcpu *vcpu, unsigned long gpa);
+void kvm_arch_flush_remote_tlbs_memslot(struct kvm *kvm,
+ const struct kvm_memory_slot *memslot);
+void kvm_init_vmcs(struct kvm *kvm);
+void kvm_vector_entry(void);
+int kvm_enter_guest(struct kvm_run *run, struct kvm_vcpu *vcpu);
+extern const unsigned long kvm_vector_size;
+extern const unsigned long kvm_enter_guest_size;
+#endif /* __ASM_LOONGARCH_KVM_HOST_H__ */
diff --git a/arch/loongarch/include/asm/kvm_types.h b/arch/loongarch/include/asm/kvm_types.h
new file mode 100644
index 000000000..060647b5f
--- /dev/null
+++ b/arch/loongarch/include/asm/kvm_types.h
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020-2023 Loongson Technology Corporation Limited
+ */
+
+#ifndef _ASM_LOONGARCH_KVM_TYPES_H
+#define _ASM_LOONGARCH_KVM_TYPES_H
+
+#define KVM_ARCH_NR_OBJS_PER_MEMORY_CACHE 4
+
+#endif /* _ASM_LOONGARCH_KVM_TYPES_H */
diff --git a/arch/loongarch/include/uapi/asm/kvm.h b/arch/loongarch/include/uapi/asm/kvm.h
new file mode 100644
index 000000000..0f90e7913
--- /dev/null
+++ b/arch/loongarch/include/uapi/asm/kvm.h
@@ -0,0 +1,121 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/*
+ * Copyright (C) 2020-2023 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.
+ *
+ * Some parts derived from the x86 version of this file.
+ */
+
+#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]; //support max 256 bits
+ } 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_iocsr_entry {
+ __u32 addr;
+ __u32 pad;
+ __u64 data;
+};
+
+struct kvm_csr_entry {
+ __u32 index;
+ __u32 reserved;
+ __u64 data;
+};
+
+/* for KVM_GET_CSRS and KVM_SET_CSRS */
+struct kvm_csrs {
+ __u32 ncsrs; /* number of csrs in entries */
+ __u32 pad;
+
+ struct kvm_csr_entry entries[0];
+};
+
+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/arch/loongarch/kvm/main.c b/arch/loongarch/kvm/main.c
new file mode 100644
index 000000000..c16c7e23e
--- /dev/null
+++ b/arch/loongarch/kvm/main.c
@@ -0,0 +1,152 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020-2023 Loongson Technology Corporation Limited
+ */
+
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/kvm_host.h>
+#include <asm/kvm_host.h>
+#include <asm/cacheflush.h>
+
+static struct kvm_context __percpu *vmcs;
+
+void kvm_init_vmcs(struct kvm *kvm)
+{
+ kvm->arch.vmcs = vmcs;
+}
+
+long kvm_arch_dev_ioctl(struct file *filp,
+ unsigned int ioctl, unsigned long arg)
+{
+ return -ENOIOCTLCMD;
+}
+
+int kvm_arch_check_processor_compat(void *opaque)
+{
+ return 0;
+}
+
+int kvm_arch_hardware_setup(void *opaque)
+{
+ return 0;
+}
+
+int kvm_arch_hardware_enable(void)
+{
+ unsigned long gcfg = 0;
+
+ /* First init gtlbc, gcfg, gstat, gintc. All guest use the same config */
+ clear_csr_gtlbc(CSR_GTLBC_USETGID | CSR_GTLBC_TOTI);
+ write_csr_gcfg(0);
+ write_csr_gstat(0);
+ write_csr_gintc(0);
+
+ /*
+ * Enable virtualization features granting guest direct control of
+ * certain features:
+ * GCI=2: Trap on init or unimplement cache instruction.
+ * TORU=0: Trap on Root Unimplement.
+ * CACTRL=1: Root control cache.
+ * TOP=0: Trap on Previlege.
+ * TOE=0: Trap on Exception.
+ * TIT=0: Trap on Timer.
+ */
+ if (cpu_has_gcip_all)
+ gcfg |= CSR_GCFG_GCI_SECURE;
+ if (cpu_has_matc_root)
+ gcfg |= CSR_GCFG_MATC_ROOT;
+
+ gcfg |= CSR_GCFG_TIT;
+ write_csr_gcfg(gcfg);
+
+ kvm_flush_tlb_all();
+
+ /* Enable using TGID */
+ set_csr_gtlbc(CSR_GTLBC_USETGID);
+ kvm_debug("gtlbc:%llx gintc:%llx gstat:%llx gcfg:%llx",
+ read_csr_gtlbc(), read_csr_gintc(),
+ read_csr_gstat(), read_csr_gcfg());
+
+ return 0;
+}
+
+void kvm_arch_hardware_disable(void)
+{
+ clear_csr_gtlbc(CSR_GTLBC_USETGID | CSR_GTLBC_TOTI);
+ write_csr_gcfg(0);
+ write_csr_gstat(0);
+ write_csr_gintc(0);
+
+ /* Flush any remaining guest TLB entries */
+ kvm_flush_tlb_all();
+}
+
+int kvm_arch_init(void *opaque)
+{
+ struct kvm_context *context;
+ unsigned long vpid_mask;
+ int cpu, order;
+ void *addr;
+
+ vmcs = alloc_percpu(struct kvm_context);
+ if (!vmcs) {
+ pr_err("kvm: failed to allocate percpu kvm_context\n");
+ return -ENOMEM;
+ }
+
+ order = get_order(kvm_vector_size + kvm_enter_guest_size);
+ addr = (void *)__get_free_pages(GFP_KERNEL, order);
+ if (!addr) {
+ free_percpu(vmcs);
+ return -ENOMEM;
+ }
+
+ memcpy(addr, kvm_vector_entry, kvm_vector_size);
+ memcpy(addr + kvm_vector_size, kvm_enter_guest, kvm_enter_guest_size);
+ flush_icache_range((unsigned long)addr, (unsigned long)addr +
+ kvm_vector_size + kvm_enter_guest_size);
+
+ vpid_mask = read_csr_gstat();
+ vpid_mask = (vpid_mask & CSR_GSTAT_GIDBIT) >> CSR_GSTAT_GIDBIT_SHIFT;
+ if (vpid_mask)
+ vpid_mask = GENMASK(vpid_mask - 1, 0);
+
+ for_each_possible_cpu(cpu) {
+ context = per_cpu_ptr(vmcs, cpu);
+ context->vpid_mask = vpid_mask;
+ context->vpid_cache = context->vpid_mask + 1;
+ context->last_vcpu = NULL;
+ context->kvm_eentry = addr;
+ context->kvm_enter_guest = addr + kvm_vector_size;
+ context->page_order = order;
+ }
+
+ _kvm_init_fault();
+
+ return 0;
+}
+
+void kvm_arch_exit(void)
+{
+ struct kvm_context *context = per_cpu_ptr(vmcs, 0);
+
+ free_pages((unsigned long)context->kvm_eentry, context->page_order);
+ free_percpu(vmcs);
+}
+
+static int kvm_loongarch_init(void)
+{
+ if (!cpu_has_lvz)
+ return 0;
+
+ return kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
+}
+
+static void kvm_loongarch_exit(void)
+{
+ kvm_exit();
+}
+
+module_init(kvm_loongarch_init);
+module_exit(kvm_loongarch_exit);
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 55155e262..6f3259849 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/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;
@@ -1175,6 +1183,9 @@ struct kvm_ppc_resize_hpt {
#define KVM_CAP_DIRTY_LOG_RING_ACQ_REL 223
#define KVM_CAP_S390_PROTECTED_ASYNC_DISABLE 224
#define KVM_CAP_DIRTY_LOG_RING_WITH_BITMAP 225
+#define KVM_CAP_LOONGARCH_FPU 226
+#define KVM_CAP_LOONGARCH_LSX 227
+#define KVM_CAP_LOONGARCH_VZ 228
#ifdef KVM_CAP_IRQ_ROUTING
@@ -1345,6 +1356,7 @@ 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
@@ -1662,6 +1674,9 @@ struct kvm_enc_region {
#define KVM_S390_NORMAL_RESET _IO(KVMIO, 0xc3)
#define KVM_S390_CLEAR_RESET _IO(KVMIO, 0xc4)
+#define KVM_GET_CSRS _IOWR(KVMIO, 0xc5, struct kvm_csrs)
+#define KVM_SET_CSRS _IOW(KVMIO, 0xc6, struct kvm_csrs)
+
struct kvm_s390_pv_sec_parm {
__u64 origin;
__u64 length;
--
2.31.1
^ permalink raw reply related [flat|nested] 36+ messages in thread
* [PATCH v1 02/24] LoongArch: KVM: Implement VM related functions
2023-02-14 2:56 [PATCH v1 00/24] Add KVM LoongArch support Tianrui Zhao
2023-02-14 2:56 ` [PATCH v1 01/24] LoongArch: KVM: Implement kvm module related interface Tianrui Zhao
@ 2023-02-14 2:56 ` Tianrui Zhao
2023-02-14 2:56 ` [PATCH v1 03/24] LoongArch: KVM: Implement vcpu create,run,destroy operations Tianrui Zhao
` (21 subsequent siblings)
23 siblings, 0 replies; 36+ messages in thread
From: Tianrui Zhao @ 2023-02-14 2:56 UTC (permalink / raw)
To: Paolo Bonzini
Cc: Huacai Chen, WANG Xuerui, Greg Kroah-Hartman, loongarch,
linux-kernel, kvm, Jens Axboe, Mark Brown, Alex Deucher
Implement loongarch VM operations:
1. Init and destroy vm interface, allocating memory page to save the
vm pgd when init vm.
2. Implement vm check extension, such as getting vcpu number info,
memory slots info, and fpu info.
3. Implement vm status description.
Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
---
arch/loongarch/kvm/vm.c | 85 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 85 insertions(+)
create mode 100644 arch/loongarch/kvm/vm.c
diff --git a/arch/loongarch/kvm/vm.c b/arch/loongarch/kvm/vm.c
new file mode 100644
index 000000000..6efa6689b
--- /dev/null
+++ b/arch/loongarch/kvm/vm.c
@@ -0,0 +1,85 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020-2023 Loongson Technology Corporation Limited
+ */
+
+#include <linux/kvm_host.h>
+#include <asm/kvm_host.h>
+
+#define KVM_LOONGARCH_VERSION 1
+
+const struct _kvm_stats_desc kvm_vm_stats_desc[] = {
+ KVM_GENERIC_VM_STATS(),
+};
+
+const struct kvm_stats_header kvm_vm_stats_header = {
+ .name_size = KVM_STATS_NAME_SIZE,
+ .num_desc = ARRAY_SIZE(kvm_vm_stats_desc),
+ .id_offset = sizeof(struct kvm_stats_header),
+ .desc_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE,
+ .data_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE +
+ sizeof(kvm_vm_stats_desc),
+};
+
+int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
+{
+ /* Allocate page table to map GPA -> RPA */
+ kvm->arch.gpa_mm.pgd = kvm_pgd_alloc();
+ if (!kvm->arch.gpa_mm.pgd)
+ return -ENOMEM;
+
+ kvm_init_vmcs(kvm);
+ return 0;
+}
+
+void kvm_arch_destroy_vm(struct kvm *kvm)
+{
+ kvm_destroy_vcpus(kvm);
+ _kvm_destroy_mm(kvm);
+}
+
+int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
+{
+ int r;
+
+ switch (ext) {
+ case KVM_CAP_ONE_REG:
+ case KVM_CAP_ENABLE_CAP:
+ case KVM_CAP_READONLY_MEM:
+ case KVM_CAP_SYNC_MMU:
+ case KVM_CAP_IMMEDIATE_EXIT:
+ case KVM_CAP_IOEVENTFD:
+ r = 1;
+ break;
+ case KVM_CAP_NR_VCPUS:
+ r = num_online_cpus();
+ break;
+ case KVM_CAP_MAX_VCPUS:
+ r = KVM_MAX_VCPUS;
+ break;
+ case KVM_CAP_MAX_VCPU_ID:
+ r = KVM_MAX_VCPU_IDS;
+ break;
+ case KVM_CAP_NR_MEMSLOTS:
+ r = KVM_USER_MEM_SLOTS;
+ break;
+ case KVM_CAP_LOONGARCH_FPU:
+ /* We don't handle systems with inconsistent cpu_has_fpu */
+ r = !!cpu_has_fpu;
+ break;
+ case KVM_CAP_LOONGARCH_VZ:
+ /* get user defined kvm version */
+ r = KVM_LOONGARCH_VERSION;
+ break;
+ default:
+ r = 0;
+ break;
+ }
+
+ return r;
+}
+
+long kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
+{
+ return -ENOIOCTLCMD;
+}
--
2.31.1
^ permalink raw reply related [flat|nested] 36+ messages in thread
* [PATCH v1 03/24] LoongArch: KVM: Implement vcpu create,run,destroy operations.
2023-02-14 2:56 [PATCH v1 00/24] Add KVM LoongArch support Tianrui Zhao
2023-02-14 2:56 ` [PATCH v1 01/24] LoongArch: KVM: Implement kvm module related interface Tianrui Zhao
2023-02-14 2:56 ` [PATCH v1 02/24] LoongArch: KVM: Implement VM related functions Tianrui Zhao
@ 2023-02-14 2:56 ` Tianrui Zhao
2023-02-14 6:40 ` Greg Kroah-Hartman
2023-02-14 2:56 ` [PATCH v1 04/24] LoongArch: KVM: Implement vcpu get, vcpu set registers Tianrui Zhao
` (20 subsequent siblings)
23 siblings, 1 reply; 36+ messages in thread
From: Tianrui Zhao @ 2023-02-14 2:56 UTC (permalink / raw)
To: Paolo Bonzini
Cc: Huacai Chen, WANG Xuerui, Greg Kroah-Hartman, loongarch,
linux-kernel, kvm, Jens Axboe, Mark Brown, Alex Deucher
Implement loongarch vcpu related operations:
1. Implement vcpu create interface, saving some info into vcpu arch
structure such as vcpu exception entrance, vcpu enter guest pointer,
etc. Init vcpu timer and set address translation mode when vcpu create.
2. Implement vcpu run interface, handling mmio, iocsr reading fault
and deliver interrupt, lose fpu before vcpu enter guest.
3. Implement vcpu handle exit interface, getting the exit code by ESTAT
register and using kvm exception vector to handle it.
Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
---
arch/loongarch/include/asm/cpu-info.h | 13 ++
arch/loongarch/include/asm/kvm_vcpu.h | 112 +++++++++++
arch/loongarch/include/asm/loongarch.h | 195 +++++++++++++++++-
arch/loongarch/kvm/trace.h | 137 +++++++++++++
arch/loongarch/kvm/vcpu.c | 261 +++++++++++++++++++++++++
5 files changed, 712 insertions(+), 6 deletions(-)
create mode 100644 arch/loongarch/include/asm/kvm_vcpu.h
create mode 100644 arch/loongarch/kvm/trace.h
create mode 100644 arch/loongarch/kvm/vcpu.c
diff --git a/arch/loongarch/include/asm/cpu-info.h b/arch/loongarch/include/asm/cpu-info.h
index cd73a6f57..1b426a2ca 100644
--- a/arch/loongarch/include/asm/cpu-info.h
+++ b/arch/loongarch/include/asm/cpu-info.h
@@ -32,6 +32,15 @@ struct cache_desc {
#define CACHE_LEVEL_MAX 3
#define CACHE_LEAVES_MAX 6
+struct guest_info {
+ unsigned long ases;
+ unsigned long ases_dyn;
+ unsigned long options;
+ unsigned long options_dyn;
+ unsigned char conf;
+ unsigned int kscratch_mask;
+};
+
struct cpuinfo_loongarch {
u64 asid_cache;
unsigned long asid_mask;
@@ -60,6 +69,10 @@ struct cpuinfo_loongarch {
unsigned int watch_dreg_count; /* Number data breakpoints */
unsigned int watch_ireg_count; /* Number instruction breakpoints */
unsigned int watch_reg_use_cnt; /* min(NUM_WATCH_REGS, watch_dreg_count + watch_ireg_count), Usable by ptrace */
+
+ /* VZ & Guest features */
+ struct guest_info guest;
+ unsigned long guest_cfg;
} __aligned(SMP_CACHE_BYTES);
extern struct cpuinfo_loongarch cpu_data[];
diff --git a/arch/loongarch/include/asm/kvm_vcpu.h b/arch/loongarch/include/asm/kvm_vcpu.h
new file mode 100644
index 000000000..66ec9bc52
--- /dev/null
+++ b/arch/loongarch/include/asm/kvm_vcpu.h
@@ -0,0 +1,112 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020-2023 Loongson Technology Corporation Limited
+ */
+
+#ifndef __ASM_LOONGARCH_KVM_VCPU_H__
+#define __ASM_LOONGARCH_KVM_VCPU_H__
+
+#include <linux/kvm_host.h>
+#include <asm/loongarch.h>
+#include <asm/kvm_host.h>
+
+#define LARCH_INT_SIP0 0
+#define LARCH_INT_SIP1 1
+#define LARCH_INT_IP0 2
+#define LARCH_INT_IP1 3
+#define LARCH_INT_IP2 4
+#define LARCH_INT_IP3 5
+#define LARCH_INT_IP4 6
+#define LARCH_INT_IP5 7
+#define LARCH_INT_IP6 8
+#define LARCH_INT_IP7 9
+#define LARCH_INT_PMU 10
+#define LARCH_INT_TIMER 11
+#define LARCH_INT_IPI 12
+#define LOONGARCH_EXC_MAX (LARCH_INT_IPI + 1)
+#define LOONGARCH_EXC_IPNUM (LOONGARCH_EXC_MAX)
+
+/* Controlled by 0x5 guest exst */
+#define CPU_SIP0 (_ULCAST_(1))
+#define CPU_SIP1 (_ULCAST_(1) << 1)
+#define CPU_PMU (_ULCAST_(1) << 10)
+#define CPU_TIMER (_ULCAST_(1) << 11)
+#define CPU_IPI (_ULCAST_(1) << 12)
+
+/* Controlled by 0x52 guest exception VIP
+ * aligned to exst bit 5~12
+ */
+#define CPU_IP0 (_ULCAST_(1))
+#define CPU_IP1 (_ULCAST_(1) << 1)
+#define CPU_IP2 (_ULCAST_(1) << 2)
+#define CPU_IP3 (_ULCAST_(1) << 3)
+#define CPU_IP4 (_ULCAST_(1) << 4)
+#define CPU_IP5 (_ULCAST_(1) << 5)
+#define CPU_IP6 (_ULCAST_(1) << 6)
+#define CPU_IP7 (_ULCAST_(1) << 7)
+
+#define MNSEC_PER_SEC (NSEC_PER_SEC >> 20)
+
+/* KVM_IRQ_LINE irq field index values */
+#define KVM_LOONGSON_IRQ_TYPE_SHIFT 24
+#define KVM_LOONGSON_IRQ_TYPE_MASK 0xff
+#define KVM_LOONGSON_IRQ_VCPU_SHIFT 16
+#define KVM_LOONGSON_IRQ_VCPU_MASK 0xff
+#define KVM_LOONGSON_IRQ_NUM_SHIFT 0
+#define KVM_LOONGSON_IRQ_NUM_MASK 0xffff
+
+/* irq_type field */
+#define KVM_LOONGSON_IRQ_TYPE_CPU_IP 0
+#define KVM_LOONGSON_IRQ_TYPE_CPU_IO 1
+#define KVM_LOONGSON_IRQ_TYPE_HT 2
+#define KVM_LOONGSON_IRQ_TYPE_MSI 3
+#define KVM_LOONGSON_IRQ_TYPE_IOAPIC 4
+#define KVM_LOONGSON_IRQ_TYPE_ROUTE 5
+
+/* out-of-kernel GIC cpu interrupt injection irq_number field */
+#define KVM_LOONGSON_IRQ_CPU_IRQ 0
+#define KVM_LOONGSON_IRQ_CPU_FIQ 1
+#define KVM_LOONGSON_CPU_IP_NUM 8
+
+typedef union loongarch_instruction larch_inst;
+typedef int (*exit_handle_fn)(struct kvm_vcpu *);
+
+int _kvm_emu_mmio_write(struct kvm_vcpu *vcpu, larch_inst inst);
+int _kvm_emu_mmio_read(struct kvm_vcpu *vcpu, larch_inst inst);
+int _kvm_complete_mmio_read(struct kvm_vcpu *vcpu, struct kvm_run *run);
+int _kvm_complete_iocsr_read(struct kvm_vcpu *vcpu, struct kvm_run *run);
+int _kvm_emu_idle(struct kvm_vcpu *vcpu);
+int _kvm_handle_pv_hcall(struct kvm_vcpu *vcpu);
+int _kvm_pending_timer(struct kvm_vcpu *vcpu);
+int _kvm_handle_fault(struct kvm_vcpu *vcpu, int fault);
+void _kvm_deliver_intr(struct kvm_vcpu *vcpu);
+
+void kvm_own_fpu(struct kvm_vcpu *vcpu);
+void kvm_lose_fpu(struct kvm_vcpu *vcpu);
+void kvm_save_fpu(struct loongarch_fpu *fpu);
+void kvm_restore_fpu(struct loongarch_fpu *fpu);
+void kvm_restore_fcsr(struct loongarch_fpu *fpu);
+
+void kvm_acquire_timer(struct kvm_vcpu *vcpu);
+void kvm_reset_timer(struct kvm_vcpu *vcpu);
+enum hrtimer_restart kvm_count_timeout(struct kvm_vcpu *vcpu);
+void kvm_init_timer(struct kvm_vcpu *vcpu, unsigned long hz);
+void kvm_restore_timer(struct kvm_vcpu *vcpu);
+void kvm_save_timer(struct kvm_vcpu *vcpu);
+
+/*
+ * Loongarch KVM guest interrupt handling.
+ */
+static inline void _kvm_queue_irq(struct kvm_vcpu *vcpu, unsigned int irq)
+{
+ set_bit(irq, &vcpu->arch.irq_pending);
+ clear_bit(irq, &vcpu->arch.irq_clear);
+}
+
+static inline void _kvm_dequeue_irq(struct kvm_vcpu *vcpu, unsigned int irq)
+{
+ clear_bit(irq, &vcpu->arch.irq_pending);
+ set_bit(irq, &vcpu->arch.irq_clear);
+}
+
+#endif /* __ASM_LOONGARCH_KVM_VCPU_H__ */
diff --git a/arch/loongarch/include/asm/loongarch.h b/arch/loongarch/include/asm/loongarch.h
index 7f8d57a61..7b74605dd 100644
--- a/arch/loongarch/include/asm/loongarch.h
+++ b/arch/loongarch/include/asm/loongarch.h
@@ -236,6 +236,44 @@ static __always_inline u64 csr_xchg64(u64 val, u64 mask, u32 reg)
return __csrxchg_d(val, mask, reg);
}
+/* GCSR */
+static inline u64 gcsr_read(u32 reg)
+{
+ u64 val = 0;
+
+ asm volatile (
+ "parse_r __reg, %[val]\n\t"
+ ".word 0x5 << 24 | %[reg] << 10 | 0 << 5 | __reg\n\t"
+ : [val] "+r" (val)
+ : [reg] "i" (reg)
+ : "memory");
+
+ return val;
+}
+
+static inline void gcsr_write(u64 val, u32 reg)
+{
+ asm volatile (
+ "parse_r __reg, %[val]\n\t"
+ ".word 0x5 << 24 | %[reg] << 10 | 1 << 5 | __reg\n\t"
+ : [val] "+r" (val)
+ : [reg] "i" (reg)
+ : "memory");
+}
+
+static inline u64 gcsr_xchg(u64 val, u64 mask, u32 reg)
+{
+ asm volatile (
+ "parse_r __rd, %[val]\n\t"
+ "parse_r __rj, %[mask]\n\t"
+ ".word 0x5 << 24 | %[reg] << 10 | __rj << 5 | __rd\n\t"
+ : [val] "+r" (val)
+ : [mask] "r" (mask), [reg] "i" (reg)
+ : "memory");
+
+ return val;
+}
+
/* IOCSR */
static __always_inline u32 iocsr_read32(u32 reg)
{
@@ -309,6 +347,7 @@ static __always_inline void iocsr_write64(u64 val, u32 reg)
#define LOONGARCH_CSR_ECFG 0x4 /* Exception config */
#define CSR_ECFG_VS_SHIFT 16
#define CSR_ECFG_VS_WIDTH 3
+#define CSR_ECFG_VS_SHIFT_END (CSR_ECFG_VS_SHIFT + CSR_ECFG_VS_WIDTH - 1)
#define CSR_ECFG_VS (_ULCAST_(0x7) << CSR_ECFG_VS_SHIFT)
#define CSR_ECFG_IM_SHIFT 0
#define CSR_ECFG_IM_WIDTH 13
@@ -397,13 +436,14 @@ static __always_inline void iocsr_write64(u64 val, u32 reg)
#define CSR_TLBLO1_V (_ULCAST_(0x1) << CSR_TLBLO1_V_SHIFT)
#define LOONGARCH_CSR_GTLBC 0x15 /* Guest TLB control */
-#define CSR_GTLBC_RID_SHIFT 16
-#define CSR_GTLBC_RID_WIDTH 8
-#define CSR_GTLBC_RID (_ULCAST_(0xff) << CSR_GTLBC_RID_SHIFT)
+#define CSR_GTLBC_TGID_SHIFT 16
+#define CSR_GTLBC_TGID_WIDTH 8
+#define CSR_GTLBC_TGID_SHIFT_END (CSR_GTLBC_TGID_SHIFT + CSR_GTLBC_TGID_WIDTH - 1)
+#define CSR_GTLBC_TGID (_ULCAST_(0xff) << CSR_GTLBC_TGID_SHIFT)
#define CSR_GTLBC_TOTI_SHIFT 13
#define CSR_GTLBC_TOTI (_ULCAST_(0x1) << CSR_GTLBC_TOTI_SHIFT)
-#define CSR_GTLBC_USERID_SHIFT 12
-#define CSR_GTLBC_USERID (_ULCAST_(0x1) << CSR_GTLBC_USERID_SHIFT)
+#define CSR_GTLBC_USETGID_SHIFT 12
+#define CSR_GTLBC_USETGID (_ULCAST_(0x1) << CSR_GTLBC_USETGID_SHIFT)
#define CSR_GTLBC_GMTLBSZ_SHIFT 0
#define CSR_GTLBC_GMTLBSZ_WIDTH 6
#define CSR_GTLBC_GMTLBSZ (_ULCAST_(0x3f) << CSR_GTLBC_GMTLBSZ_SHIFT)
@@ -555,6 +595,7 @@ static __always_inline void iocsr_write64(u64 val, u32 reg)
#define LOONGARCH_CSR_GSTAT 0x50 /* Guest status */
#define CSR_GSTAT_GID_SHIFT 16
#define CSR_GSTAT_GID_WIDTH 8
+#define CSR_GSTAT_GID_SHIFT_END (CSR_GSTAT_GID_SHIFT + CSR_GSTAT_GID_WIDTH - 1)
#define CSR_GSTAT_GID (_ULCAST_(0xff) << CSR_GSTAT_GID_SHIFT)
#define CSR_GSTAT_GIDBIT_SHIFT 4
#define CSR_GSTAT_GIDBIT_WIDTH 6
@@ -605,6 +646,12 @@ static __always_inline void iocsr_write64(u64 val, u32 reg)
#define CSR_GCFG_MATC_GUEST (_ULCAST_(0x0) << CSR_GCFG_MATC_SHITF)
#define CSR_GCFG_MATC_ROOT (_ULCAST_(0x1) << CSR_GCFG_MATC_SHITF)
#define CSR_GCFG_MATC_NEST (_ULCAST_(0x2) << CSR_GCFG_MATC_SHITF)
+#define CSR_GCFG_MATP_SHITF 0
+#define CSR_GCFG_MATP_WIDTH 4
+#define CSR_GCFG_MATP_MASK (_ULCAST_(0x3) << CSR_GCFG_MATP_SHITF)
+#define CSR_GCFG_MATP_GUEST (_ULCAST_(0x0) << CSR_GCFG_MATP_SHITF)
+#define CSR_GCFG_MATP_ROOT (_ULCAST_(0x1) << CSR_GCFG_MATP_SHITF)
+#define CSR_GCFG_MATP_NEST (_ULCAST_(0x2) << CSR_GCFG_MATP_SHITF)
#define LOONGARCH_CSR_GINTC 0x52 /* Guest interrupt control */
#define CSR_GINTC_HC_SHIFT 16
@@ -1273,6 +1320,131 @@ static inline void write_csr_tlbrefill_pagesize(unsigned int size)
#define write_csr_perfctrl3(val) csr_write64(val, LOONGARCH_CSR_PERFCTRL3)
#define write_csr_perfcntr3(val) csr_write64(val, LOONGARCH_CSR_PERFCNTR3)
+/* Guest related CSRS */
+#define read_csr_gtlbc() csr_read64(LOONGARCH_CSR_GTLBC)
+#define write_csr_gtlbc(val) csr_write64(val, LOONGARCH_CSR_GTLBC)
+#define read_csr_trgp() csr_read64(LOONGARCH_CSR_TRGP)
+#define read_csr_gcfg() csr_read64(LOONGARCH_CSR_GCFG)
+#define write_csr_gcfg(val) csr_write64(val, LOONGARCH_CSR_GCFG)
+#define read_csr_gstat() csr_read64(LOONGARCH_CSR_GSTAT)
+#define write_csr_gstat(val) csr_write64(val, LOONGARCH_CSR_GSTAT)
+#define read_csr_gintc() csr_read64(LOONGARCH_CSR_GINTC)
+#define write_csr_gintc(val) csr_write64(val, LOONGARCH_CSR_GINTC)
+#define read_csr_gcntc() csr_read64(LOONGARCH_CSR_GCNTC)
+#define write_csr_gcntc(val) csr_write64(val, LOONGARCH_CSR_GCNTC)
+
+/* Guest CSRS read and write */
+#define read_gcsr_crmd() gcsr_read(LOONGARCH_CSR_CRMD)
+#define write_gcsr_crmd(val) gcsr_write(val, LOONGARCH_CSR_CRMD)
+#define read_gcsr_prmd() gcsr_read(LOONGARCH_CSR_PRMD)
+#define write_gcsr_prmd(val) gcsr_write(val, LOONGARCH_CSR_PRMD)
+#define read_gcsr_euen() gcsr_read(LOONGARCH_CSR_EUEN)
+#define write_gcsr_euen(val) gcsr_write(val, LOONGARCH_CSR_EUEN)
+#define read_gcsr_misc() gcsr_read(LOONGARCH_CSR_MISC)
+#define write_gcsr_misc(val) gcsr_write(val, LOONGARCH_CSR_MISC)
+#define read_gcsr_ecfg() gcsr_read(LOONGARCH_CSR_ECFG)
+#define write_gcsr_ecfg(val) gcsr_write(val, LOONGARCH_CSR_ECFG)
+#define read_gcsr_estat() gcsr_read(LOONGARCH_CSR_ESTAT)
+#define write_gcsr_estat(val) gcsr_write(val, LOONGARCH_CSR_ESTAT)
+#define read_gcsr_era() gcsr_read(LOONGARCH_CSR_ERA)
+#define write_gcsr_era(val) gcsr_write(val, LOONGARCH_CSR_ERA)
+#define read_gcsr_badv() gcsr_read(LOONGARCH_CSR_BADV)
+#define write_gcsr_badv(val) gcsr_write(val, LOONGARCH_CSR_BADV)
+#define read_gcsr_badi() gcsr_read(LOONGARCH_CSR_BADI)
+#define write_gcsr_badi(val) gcsr_write(val, LOONGARCH_CSR_BADI)
+#define read_gcsr_eentry() gcsr_read(LOONGARCH_CSR_EENTRY)
+#define write_gcsr_eentry(val) gcsr_write(val, LOONGARCH_CSR_EENTRY)
+
+#define read_gcsr_tlbidx() gcsr_read(LOONGARCH_CSR_TLBIDX)
+#define write_gcsr_tlbidx(val) gcsr_write(val, LOONGARCH_CSR_TLBIDX)
+#define read_gcsr_tlbhi() gcsr_read(LOONGARCH_CSR_TLBEHI)
+#define write_gcsr_tlbhi(val) gcsr_write(val, LOONGARCH_CSR_TLBEHI)
+#define read_gcsr_tlblo0() gcsr_read(LOONGARCH_CSR_TLBELO0)
+#define write_gcsr_tlblo0(val) gcsr_write(val, LOONGARCH_CSR_TLBELO0)
+#define read_gcsr_tlblo1() gcsr_read(LOONGARCH_CSR_TLBELO1)
+#define write_gcsr_tlblo1(val) gcsr_write(val, LOONGARCH_CSR_TLBELO1)
+
+#define read_gcsr_asid() gcsr_read(LOONGARCH_CSR_ASID)
+#define write_gcsr_asid(val) gcsr_write(val, LOONGARCH_CSR_ASID)
+#define read_gcsr_pgdl() gcsr_read(LOONGARCH_CSR_PGDL)
+#define write_gcsr_pgdl(val) gcsr_write(val, LOONGARCH_CSR_PGDL)
+#define read_gcsr_pgdh() gcsr_read(LOONGARCH_CSR_PGDH)
+#define write_gcsr_pgdh(val) gcsr_write(val, LOONGARCH_CSR_PGDH)
+#define write_gcsr_pgd(val) gcsr_write(val, LOONGARCH_CSR_PGD)
+#define read_gcsr_pgd() gcsr_read(LOONGARCH_CSR_PGD)
+#define read_gcsr_pwctl0() gcsr_read(LOONGARCH_CSR_PWCTL0)
+#define write_gcsr_pwctl0(val) gcsr_write(val, LOONGARCH_CSR_PWCTL0)
+#define read_gcsr_pwctl1() gcsr_read(LOONGARCH_CSR_PWCTL1)
+#define write_gcsr_pwctl1(val) gcsr_write(val, LOONGARCH_CSR_PWCTL1)
+#define read_gcsr_stlbpgsize() gcsr_read(LOONGARCH_CSR_STLBPGSIZE)
+#define write_gcsr_stlbpgsize(val) gcsr_write(val, LOONGARCH_CSR_STLBPGSIZE)
+#define read_gcsr_rvacfg() gcsr_read(LOONGARCH_CSR_RVACFG)
+#define write_gcsr_rvacfg(val) gcsr_write(val, LOONGARCH_CSR_RVACFG)
+
+#define read_gcsr_cpuid() gcsr_read(LOONGARCH_CSR_CPUID)
+#define write_gcsr_cpuid(val) gcsr_write(val, LOONGARCH_CSR_CPUID)
+#define read_gcsr_prcfg1() gcsr_read(LOONGARCH_CSR_PRCFG1)
+#define write_gcsr_prcfg1(val) gcsr_write(val, LOONGARCH_CSR_PRCFG1)
+#define read_gcsr_prcfg2() gcsr_read(LOONGARCH_CSR_PRCFG2)
+#define write_gcsr_prcfg2(val) gcsr_write(val, LOONGARCH_CSR_PRCFG2)
+#define read_gcsr_prcfg3() gcsr_read(LOONGARCH_CSR_PRCFG3)
+#define write_gcsr_prcfg3(val) gcsr_write(val, LOONGARCH_CSR_PRCFG3)
+
+#define read_gcsr_kscratch0() gcsr_read(LOONGARCH_CSR_KS0)
+#define write_gcsr_kscratch0(val) gcsr_write(val, LOONGARCH_CSR_KS0)
+#define read_gcsr_kscratch1() gcsr_read(LOONGARCH_CSR_KS1)
+#define write_gcsr_kscratch1(val) gcsr_write(val, LOONGARCH_CSR_KS1)
+#define read_gcsr_kscratch2() gcsr_read(LOONGARCH_CSR_KS2)
+#define write_gcsr_kscratch2(val) gcsr_write(val, LOONGARCH_CSR_KS2)
+#define read_gcsr_kscratch3() gcsr_read(LOONGARCH_CSR_KS3)
+#define write_gcsr_kscratch3(val) gcsr_write(val, LOONGARCH_CSR_KS3)
+#define read_gcsr_kscratch4() gcsr_read(LOONGARCH_CSR_KS4)
+#define write_gcsr_kscratch4(val) gcsr_write(val, LOONGARCH_CSR_KS4)
+#define read_gcsr_kscratch5() gcsr_read(LOONGARCH_CSR_KS5)
+#define write_gcsr_kscratch5(val) gcsr_write(val, LOONGARCH_CSR_KS5)
+#define read_gcsr_kscratch6() gcsr_read(LOONGARCH_CSR_KS6)
+#define write_gcsr_kscratch6(val) gcsr_write(val, LOONGARCH_CSR_KS6)
+#define read_gcsr_kscratch7() gcsr_read(LOONGARCH_CSR_KS7)
+#define write_gcsr_kscratch7(val) gcsr_write(val, LOONGARCH_CSR_KS7)
+
+#define read_gcsr_timerid() gcsr_read(LOONGARCH_CSR_TMID)
+#define write_gcsr_timerid(val) gcsr_write(val, LOONGARCH_CSR_TMID)
+#define read_gcsr_timercfg() gcsr_read(LOONGARCH_CSR_TCFG)
+#define write_gcsr_timercfg(val) gcsr_write(val, LOONGARCH_CSR_TCFG)
+#define read_gcsr_timertick() gcsr_read(LOONGARCH_CSR_TVAL)
+#define write_gcsr_timertick(val) gcsr_write(val, LOONGARCH_CSR_TVAL)
+#define read_gcsr_timeroffset() gcsr_read(LOONGARCH_CSR_CNTC)
+#define write_gcsr_timeroffset(val) gcsr_write(val, LOONGARCH_CSR_CNTC)
+
+#define read_gcsr_llbctl() gcsr_read(LOONGARCH_CSR_LLBCTL)
+#define write_gcsr_llbctl(val) gcsr_write(val, LOONGARCH_CSR_LLBCTL)
+
+#define read_gcsr_tlbrentry() gcsr_read(LOONGARCH_CSR_TLBRENTRY)
+#define write_gcsr_tlbrentry(val) gcsr_write(val, LOONGARCH_CSR_TLBRENTRY)
+#define read_gcsr_tlbrbadv() gcsr_read(LOONGARCH_CSR_TLBRBADV)
+#define write_gcsr_tlbrbadv(val) gcsr_write(val, LOONGARCH_CSR_TLBRBADV)
+#define read_gcsr_tlbrera() gcsr_read(LOONGARCH_CSR_TLBRERA)
+#define write_gcsr_tlbrera(val) gcsr_write(val, LOONGARCH_CSR_TLBRERA)
+#define read_gcsr_tlbrsave() gcsr_read(LOONGARCH_CSR_TLBRSAVE)
+#define write_gcsr_tlbrsave(val) gcsr_write(val, LOONGARCH_CSR_TLBRSAVE)
+#define read_gcsr_tlbrelo0() gcsr_read(LOONGARCH_CSR_TLBRELO0)
+#define write_gcsr_tlbrelo0(val) gcsr_write(val, LOONGARCH_CSR_TLBRELO0)
+#define read_gcsr_tlbrelo1() gcsr_read(LOONGARCH_CSR_TLBRELO1)
+#define write_gcsr_tlbrelo1(val) gcsr_write(val, LOONGARCH_CSR_TLBRELO1)
+#define read_gcsr_tlbrehi() gcsr_read(LOONGARCH_CSR_TLBREHI)
+#define write_gcsr_tlbrehi(val) gcsr_write(val, LOONGARCH_CSR_TLBREHI)
+#define read_gcsr_tlbrprmd() gcsr_read(LOONGARCH_CSR_TLBRPRMD)
+#define write_gcsr_tlbrprmd(val) gcsr_write(val, LOONGARCH_CSR_TLBRPRMD)
+
+#define read_gcsr_directwin0() gcsr_read(LOONGARCH_CSR_DMWIN0)
+#define write_gcsr_directwin0(val) gcsr_write(val, LOONGARCH_CSR_DMWIN0)
+#define read_gcsr_directwin1() gcsr_read(LOONGARCH_CSR_DMWIN1)
+#define write_gcsr_directwin1(val) gcsr_write(val, LOONGARCH_CSR_DMWIN1)
+#define read_gcsr_directwin2() gcsr_read(LOONGARCH_CSR_DMWIN2)
+#define write_gcsr_directwin2(val) gcsr_write(val, LOONGARCH_CSR_DMWIN2)
+#define read_gcsr_directwin3() gcsr_read(LOONGARCH_CSR_DMWIN3)
+#define write_gcsr_directwin3(val) gcsr_write(val, LOONGARCH_CSR_DMWIN3)
+
/*
* Manipulate bits in a register.
*/
@@ -1315,15 +1487,26 @@ change_##name(unsigned long change, unsigned long val) \
}
#define __BUILD_CSR_OP(name) __BUILD_CSR_COMMON(csr_##name)
+#define __BUILD_GCSR_OP(name) __BUILD_CSR_COMMON(gcsr_##name)
__BUILD_CSR_OP(euen)
__BUILD_CSR_OP(ecfg)
__BUILD_CSR_OP(tlbidx)
+__BUILD_CSR_OP(gcfg)
+__BUILD_CSR_OP(gstat)
+__BUILD_CSR_OP(gtlbc)
+__BUILD_CSR_OP(gintc)
+__BUILD_GCSR_OP(llbctl)
+__BUILD_GCSR_OP(tlbidx)
#define set_csr_estat(val) \
csr_xchg32(val, val, LOONGARCH_CSR_ESTAT)
#define clear_csr_estat(val) \
csr_xchg32(~(val), val, LOONGARCH_CSR_ESTAT)
+#define set_gcsr_estat(val) \
+ gcsr_xchg(val, val, LOONGARCH_CSR_ESTAT)
+#define clear_gcsr_estat(val) \
+ gcsr_xchg(~(val), val, LOONGARCH_CSR_ESTAT)
#endif /* __ASSEMBLY__ */
@@ -1408,7 +1591,7 @@ __BUILD_CSR_OP(tlbidx)
#define EXCCODE_WATCH 19 /* Watch address reference */
#define EXCCODE_BTDIS 20 /* Binary Trans. Disabled */
#define EXCCODE_BTE 21 /* Binary Trans. Exception */
-#define EXCCODE_PSI 22 /* Guest Privileged Error */
+#define EXCCODE_GSPR 22 /* Guest Privileged Error */
#define EXCCODE_HYP 23 /* Hypercall */
#define EXCCODE_GCM 24 /* Guest CSR modified */
#define EXCSUBCODE_GCSC 0 /* Software caused */
diff --git a/arch/loongarch/kvm/trace.h b/arch/loongarch/kvm/trace.h
new file mode 100644
index 000000000..1813410e2
--- /dev/null
+++ b/arch/loongarch/kvm/trace.h
@@ -0,0 +1,137 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020-2023 Loongson Technology Corporation Limited
+ */
+
+#if !defined(_TRACE_KVM_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_KVM_H
+
+#include <linux/tracepoint.h>
+#include <asm/kvm_csr.h>
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM kvm
+#define TRACE_INCLUDE_PATH .
+#define TRACE_INCLUDE_FILE trace
+
+/*
+ * Tracepoints for VM enters
+ */
+DECLARE_EVENT_CLASS(kvm_transition,
+ TP_PROTO(struct kvm_vcpu *vcpu),
+ TP_ARGS(vcpu),
+ TP_STRUCT__entry(
+ __field(unsigned long, pc)
+ ),
+
+ TP_fast_assign(
+ __entry->pc = vcpu->arch.pc;
+ ),
+
+ TP_printk("PC: 0x%08lx",
+ __entry->pc)
+);
+
+DEFINE_EVENT(kvm_transition, kvm_enter,
+ TP_PROTO(struct kvm_vcpu *vcpu),
+ TP_ARGS(vcpu));
+
+DEFINE_EVENT(kvm_transition, kvm_reenter,
+ TP_PROTO(struct kvm_vcpu *vcpu),
+ TP_ARGS(vcpu));
+
+DEFINE_EVENT(kvm_transition, kvm_out,
+ TP_PROTO(struct kvm_vcpu *vcpu),
+ TP_ARGS(vcpu));
+
+/* Further exit reasons */
+#define KVM_TRACE_EXIT_IDLE 64
+#define KVM_TRACE_EXIT_CACHE 65
+#define KVM_TRACE_EXIT_SIGNAL 66
+
+/* Tracepoints for VM exits */
+#define kvm_trace_symbol_exit_types \
+ ({ KVM_TRACE_EXIT_IDLE, "IDLE" }, \
+ { KVM_TRACE_EXIT_CACHE, "CACHE" }, \
+ { KVM_TRACE_EXIT_SIGNAL, "Signal" })
+
+TRACE_EVENT(kvm_exit,
+ TP_PROTO(struct kvm_vcpu *vcpu, unsigned int reason),
+ TP_ARGS(vcpu, reason),
+ TP_STRUCT__entry(
+ __field(unsigned long, pc)
+ __field(unsigned int, reason)
+ ),
+
+ TP_fast_assign(
+ __entry->pc = vcpu->arch.pc;
+ __entry->reason = reason;
+ ),
+
+ TP_printk("[%s]PC: 0x%08lx",
+ __print_symbolic(__entry->reason,
+ kvm_trace_symbol_exit_types),
+ __entry->pc)
+);
+
+#define KVM_TRACE_AUX_RESTORE 0
+#define KVM_TRACE_AUX_SAVE 1
+#define KVM_TRACE_AUX_ENABLE 2
+#define KVM_TRACE_AUX_DISABLE 3
+#define KVM_TRACE_AUX_DISCARD 4
+
+#define KVM_TRACE_AUX_FPU 1
+
+#define kvm_trace_symbol_aux_op \
+ ({ KVM_TRACE_AUX_RESTORE, "restore" }, \
+ { KVM_TRACE_AUX_SAVE, "save" }, \
+ { KVM_TRACE_AUX_ENABLE, "enable" }, \
+ { KVM_TRACE_AUX_DISABLE, "disable" }, \
+ { KVM_TRACE_AUX_DISCARD, "discard" })
+
+#define kvm_trace_symbol_aux_state \
+ { KVM_TRACE_AUX_FPU, "FPU" }, \
+
+TRACE_EVENT(kvm_aux,
+ TP_PROTO(struct kvm_vcpu *vcpu, unsigned int op,
+ unsigned int state),
+ TP_ARGS(vcpu, op, state),
+ TP_STRUCT__entry(
+ __field(unsigned long, pc)
+ __field(u8, op)
+ __field(u8, state)
+ ),
+
+ TP_fast_assign(
+ __entry->pc = vcpu->arch.pc;
+ __entry->op = op;
+ __entry->state = state;
+ ),
+
+ TP_printk("%s %s PC: 0x%08lx",
+ __print_symbolic(__entry->op,
+ kvm_trace_symbol_aux_op),
+ __print_symbolic(__entry->state,
+ kvm_trace_symbol_aux_state),
+ __entry->pc)
+);
+
+TRACE_EVENT(kvm_vpid_change,
+ TP_PROTO(struct kvm_vcpu *vcpu, unsigned long vpid),
+ TP_ARGS(vcpu, vpid),
+ TP_STRUCT__entry(
+ __field(unsigned long, vpid)
+ ),
+
+ TP_fast_assign(
+ __entry->vpid = vpid;
+ ),
+
+ TP_printk("vpid: 0x%08lx",
+ __entry->vpid)
+);
+
+#endif /* _TRACE_KVM_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c
new file mode 100644
index 000000000..1732da8a8
--- /dev/null
+++ b/arch/loongarch/kvm/vcpu.c
@@ -0,0 +1,261 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020-2023 Loongson Technology Corporation Limited
+ */
+
+#include <linux/kvm_host.h>
+#include <asm/fpu.h>
+#include <asm/loongarch.h>
+#include <asm/setup.h>
+#include <asm/time.h>
+#include <asm/kvm_host.h>
+
+#define CREATE_TRACE_POINTS
+#include "trace.h"
+
+int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
+{
+ return 0;
+}
+
+/* Returns 1 if the guest TLB may be clobbered */
+static int _kvm_check_requests(struct kvm_vcpu *vcpu, int cpu)
+{
+ int ret = 0;
+ int i;
+
+ if (!kvm_request_pending(vcpu))
+ return 0;
+
+ if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) {
+ /* Drop all vpids for this VCPU */
+ for_each_possible_cpu(i)
+ vcpu->arch.vpid[i] = 0;
+ /* This will clobber guest TLB contents too */
+ ret = 1;
+ }
+
+ return ret;
+}
+
+/*
+ * Return value is in the form (errcode<<2 | RESUME_FLAG_HOST | RESUME_FLAG_NV)
+ */
+static int _kvm_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu)
+{
+ unsigned long exst = vcpu->arch.host_estat;
+ u32 intr = exst & 0x1fff; /* ignore NMI */
+ u32 exccode = (exst & CSR_ESTAT_EXC) >> CSR_ESTAT_EXC_SHIFT;
+ u32 __user *opc = (u32 __user *) vcpu->arch.pc;
+ int ret = RESUME_GUEST, cpu;
+
+ vcpu->mode = OUTSIDE_GUEST_MODE;
+
+ /* Set a default exit reason */
+ run->exit_reason = KVM_EXIT_UNKNOWN;
+ run->ready_for_interrupt_injection = 1;
+
+ /*
+ * Set the appropriate status bits based on host CPU features,
+ * before we hit the scheduler
+ */
+
+ local_irq_enable();
+
+ kvm_debug("%s: exst: %lx, PC: %p, kvm_run: %p, kvm_vcpu: %p\n",
+ __func__, exst, opc, run, vcpu);
+ trace_kvm_exit(vcpu, exccode);
+ if (exccode) {
+ ret = _kvm_handle_fault(vcpu, exccode);
+ } else {
+ WARN(!intr, "suspicious vm exiting");
+ ++vcpu->stat.int_exits;
+
+ if (need_resched())
+ cond_resched();
+
+ ret = RESUME_GUEST;
+ }
+
+ cond_resched();
+
+ local_irq_disable();
+
+ if (ret == RESUME_GUEST)
+ kvm_acquire_timer(vcpu);
+
+ if (!(ret & RESUME_HOST)) {
+ _kvm_deliver_intr(vcpu);
+ /* Only check for signals if not already exiting to userspace */
+ if (signal_pending(current)) {
+ run->exit_reason = KVM_EXIT_INTR;
+ ret = (-EINTR << 2) | RESUME_HOST;
+ ++vcpu->stat.signal_exits;
+ trace_kvm_exit(vcpu, KVM_TRACE_EXIT_SIGNAL);
+ }
+ }
+
+ if (ret == RESUME_GUEST) {
+ trace_kvm_reenter(vcpu);
+
+ /*
+ * Make sure the read of VCPU requests in vcpu_reenter()
+ * callback is not reordered ahead of the write to vcpu->mode,
+ * or we could miss a TLB flush request while the requester sees
+ * the VCPU as outside of guest mode and not needing an IPI.
+ */
+ smp_store_mb(vcpu->mode, IN_GUEST_MODE);
+
+ cpu = smp_processor_id();
+ _kvm_check_requests(vcpu, cpu);
+ _kvm_check_vmid(vcpu, cpu);
+ vcpu->arch.host_eentry = csr_read64(LOONGARCH_CSR_EENTRY);
+
+ /*
+ * If FPU are enabled (i.e. the guest's FPU context
+ * is live), restore FCSR0.
+ */
+ if (_kvm_guest_has_fpu(&vcpu->arch) &&
+ read_csr_euen() & (CSR_EUEN_FPEN)) {
+ kvm_restore_fcsr(&vcpu->arch.fpu);
+ }
+ }
+
+ return ret;
+}
+
+int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
+{
+ int i;
+ unsigned long timer_hz;
+ struct loongarch_csrs *csr;
+ struct kvm_context *kvm_context = per_cpu_ptr(vcpu->kvm->arch.vmcs, 0);
+
+ for_each_possible_cpu(i)
+ vcpu->arch.vpid[i] = 0;
+
+ hrtimer_init(&vcpu->arch.swtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_PINNED);
+ vcpu->arch.swtimer.function = kvm_swtimer_wakeup;
+ vcpu->arch.fpu_enabled = true;
+ vcpu->kvm->arch.online_vcpus = vcpu->vcpu_id + 1;
+
+ vcpu->arch.guest_eentry = (unsigned long)kvm_context->kvm_eentry;
+ vcpu->arch.vcpu_run = kvm_context->kvm_enter_guest;
+ vcpu->arch.handle_exit = _kvm_handle_exit;
+ vcpu->arch.csr = kzalloc(sizeof(struct loongarch_csrs), GFP_KERNEL);
+ if (!vcpu->arch.csr)
+ return -ENOMEM;
+
+ /*
+ * kvm all exceptions share one exception entry, and host <-> guest switch
+ * also switch excfg.VS field, keep host excfg.VS info here
+ */
+ vcpu->arch.host_ecfg = (read_csr_ecfg() & CSR_ECFG_VS);
+
+ /* Init */
+ vcpu->arch.last_sched_cpu = -1;
+ vcpu->arch.last_exec_cpu = -1;
+
+ /*
+ * Initialize guest register state to valid architectural reset state.
+ */
+ timer_hz = calc_const_freq();
+ kvm_init_timer(vcpu, timer_hz);
+
+ /* Set Initialize mode for GUEST */
+ csr = vcpu->arch.csr;
+ kvm_write_sw_gcsr(csr, LOONGARCH_CSR_CRMD, CSR_CRMD_DA);
+
+ /* Set cpuid */
+ kvm_write_sw_gcsr(csr, LOONGARCH_CSR_TMID, vcpu->vcpu_id);
+
+ /* start with no pending virtual guest interrupts */
+ csr->csrs[LOONGARCH_CSR_GINTC] = 0;
+
+ return 0;
+}
+
+void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
+{
+}
+
+void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
+{
+ int cpu;
+ struct kvm_context *context;
+
+ hrtimer_cancel(&vcpu->arch.swtimer);
+ kvm_mmu_free_memory_cache(&vcpu->arch.mmu_page_cache);
+ kfree(vcpu->arch.csr);
+
+ /*
+ * If the VCPU is freed and reused as another VCPU, we don't want the
+ * matching pointer wrongly hanging around in last_vcpu.
+ */
+ for_each_possible_cpu(cpu) {
+ context = per_cpu_ptr(vcpu->kvm->arch.vmcs, cpu);
+ if (context->last_vcpu == vcpu)
+ context->last_vcpu = NULL;
+ }
+}
+
+int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
+{
+ int r = -EINTR;
+ int cpu;
+ struct kvm_run *run = vcpu->run;
+
+ vcpu_load(vcpu);
+
+ kvm_sigset_activate(vcpu);
+
+ if (vcpu->mmio_needed) {
+ if (!vcpu->mmio_is_write)
+ _kvm_complete_mmio_read(vcpu, run);
+ vcpu->mmio_needed = 0;
+ }
+
+ if (run->exit_reason == KVM_EXIT_LOONGARCH_IOCSR) {
+ if (!run->iocsr_io.is_write)
+ _kvm_complete_iocsr_read(vcpu, run);
+ }
+
+ /* clear exit_reason */
+ run->exit_reason = KVM_EXIT_UNKNOWN;
+ if (run->immediate_exit)
+ goto out;
+
+ lose_fpu(1);
+
+ local_irq_disable();
+ guest_enter_irqoff();
+ trace_kvm_enter(vcpu);
+
+ /*
+ * Make sure the read of VCPU requests in vcpu_run() callback is not
+ * reordered ahead of the write to vcpu->mode, or we could miss a TLB
+ * flush request while the requester sees the VCPU as outside of guest
+ * mode and not needing an IPI.
+ */
+ smp_store_mb(vcpu->mode, IN_GUEST_MODE);
+
+ cpu = smp_processor_id();
+ kvm_acquire_timer(vcpu);
+ /* Check if we have any exceptions/interrupts pending */
+ _kvm_deliver_intr(vcpu);
+
+ _kvm_check_requests(vcpu, cpu);
+ _kvm_check_vmid(vcpu, cpu);
+ vcpu->arch.host_eentry = csr_read64(LOONGARCH_CSR_EENTRY);
+ r = vcpu->arch.vcpu_run(run, vcpu);
+
+ trace_kvm_out(vcpu);
+ guest_exit_irqoff();
+ local_irq_enable();
+
+out:
+ kvm_sigset_deactivate(vcpu);
+
+ vcpu_put(vcpu);
+ return r;
+}
--
2.31.1
^ permalink raw reply related [flat|nested] 36+ messages in thread
* [PATCH v1 04/24] LoongArch: KVM: Implement vcpu get, vcpu set registers
2023-02-14 2:56 [PATCH v1 00/24] Add KVM LoongArch support Tianrui Zhao
` (2 preceding siblings ...)
2023-02-14 2:56 ` [PATCH v1 03/24] LoongArch: KVM: Implement vcpu create,run,destroy operations Tianrui Zhao
@ 2023-02-14 2:56 ` Tianrui Zhao
2023-02-14 2:56 ` [PATCH v1 05/24] LoongArch: KVM: Implement vcpu ENABLE_CAP, CHECK_EXTENSION ioctl interface Tianrui Zhao
` (19 subsequent siblings)
23 siblings, 0 replies; 36+ messages in thread
From: Tianrui Zhao @ 2023-02-14 2:56 UTC (permalink / raw)
To: Paolo Bonzini
Cc: Huacai Chen, WANG Xuerui, Greg Kroah-Hartman, loongarch,
linux-kernel, kvm, Jens Axboe, Mark Brown, Alex Deucher
Implement loongarch vcpu get registers and set registers operations, it
is called when user space use the ioctl interface to get or set regs.
Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
---
arch/loongarch/kvm/vcpu.c | 442 ++++++++++++++++++++++++++++++++++++++
1 file changed, 442 insertions(+)
diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c
index 1732da8a8..a18864284 100644
--- a/arch/loongarch/kvm/vcpu.c
+++ b/arch/loongarch/kvm/vcpu.c
@@ -13,6 +13,448 @@
#define CREATE_TRACE_POINTS
#include "trace.h"
+int _kvm_getcsr(struct kvm_vcpu *vcpu, unsigned int id, u64 *v, int force)
+{
+ struct loongarch_csrs *csr = vcpu->arch.csr;
+
+ GET_HW_GCSR(id, LOONGARCH_CSR_CRMD, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_PRMD, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_EUEN, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_MISC, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_ECFG, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_ESTAT, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_ERA, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_BADV, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_BADI, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_EENTRY, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_TLBIDX, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_TLBEHI, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_TLBELO0, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_TLBELO1, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_ASID, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_PGDL, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_PGDH, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_PWCTL0, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_PWCTL1, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_STLBPGSIZE, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_RVACFG, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_CPUID, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_PRCFG1, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_PRCFG2, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_PRCFG3, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_KS0, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_KS1, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_KS2, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_KS3, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_KS4, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_KS5, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_KS6, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_KS7, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_TMID, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_TCFG, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_TVAL, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_CNTC, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_LLBCTL, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_TLBRENTRY, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_TLBRBADV, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_TLBRERA, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_TLBRSAVE, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_TLBRELO0, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_TLBRELO1, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_TLBREHI, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_TLBRPRMD, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_DMWIN0, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_DMWIN1, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_DMWIN2, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_DMWIN3, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_MWPS, v);
+ GET_HW_GCSR(id, LOONGARCH_CSR_FWPS, v);
+
+ GET_SW_GCSR(csr, id, LOONGARCH_CSR_IMPCTL1, v);
+ GET_SW_GCSR(csr, id, LOONGARCH_CSR_IMPCTL2, v);
+ GET_SW_GCSR(csr, id, LOONGARCH_CSR_MERRCTL, v);
+ GET_SW_GCSR(csr, id, LOONGARCH_CSR_MERRINFO1, v);
+ GET_SW_GCSR(csr, id, LOONGARCH_CSR_MERRINFO2, v);
+ GET_SW_GCSR(csr, id, LOONGARCH_CSR_MERRENTRY, v);
+ GET_SW_GCSR(csr, id, LOONGARCH_CSR_MERRERA, v);
+ GET_SW_GCSR(csr, id, LOONGARCH_CSR_MERRSAVE, v);
+ GET_SW_GCSR(csr, id, LOONGARCH_CSR_CTAG, v);
+ GET_SW_GCSR(csr, id, LOONGARCH_CSR_DEBUG, v);
+ GET_SW_GCSR(csr, id, LOONGARCH_CSR_DERA, v);
+ GET_SW_GCSR(csr, id, LOONGARCH_CSR_DESAVE, v);
+
+ GET_SW_GCSR(csr, id, LOONGARCH_CSR_TINTCLR, v);
+
+ if (force && (id < CSR_ALL_SIZE)) {
+ *v = kvm_read_sw_gcsr(csr, id);
+ return 0;
+ }
+
+ return -1;
+}
+
+int _kvm_setcsr(struct kvm_vcpu *vcpu, unsigned int id, u64 *v, int force)
+{
+ struct loongarch_csrs *csr = vcpu->arch.csr;
+ int ret;
+
+ SET_HW_GCSR(csr, id, LOONGARCH_CSR_CRMD, v);
+ SET_HW_GCSR(csr, id, LOONGARCH_CSR_PRMD, v);
+ SET_HW_GCSR(csr, id, LOONGARCH_CSR_EUEN, v);
+ SET_HW_GCSR(csr, id, LOONGARCH_CSR_MISC, v);
+ SET_HW_GCSR(csr, id, LOONGARCH_CSR_ECFG, v);
+ SET_HW_GCSR(csr, id, LOONGARCH_CSR_ERA, v);
+ SET_HW_GCSR(csr, id, LOONGARCH_CSR_BADV, v);
+ SET_HW_GCSR(csr, id, LOONGARCH_CSR_BADI, v);
+ SET_HW_GCSR(csr, id, LOONGARCH_CSR_EENTRY, v);
+ SET_HW_GCSR(csr, id, LOONGARCH_CSR_TLBIDX, v);
+ SET_HW_GCSR(csr, id, LOONGARCH_CSR_TLBEHI, v);
+ SET_HW_GCSR(csr, id, LOONGARCH_CSR_TLBELO0, v);
+ SET_HW_GCSR(csr, id, LOONGARCH_CSR_TLBELO1, v);
+ SET_HW_GCSR(csr, id, LOONGARCH_CSR_ASID, v);
+ SET_HW_GCSR(csr, id, LOONGARCH_CSR_PGDL, v);
+ SET_HW_GCSR(csr, id, LOONGARCH_CSR_PGDH, v);
+ SET_HW_GCSR(csr, id, LOONGARCH_CSR_PWCTL0, v);
+ SET_HW_GCSR(csr, id, LOONGARCH_CSR_PWCTL1, v);
+ SET_HW_GCSR(csr, id, LOONGARCH_CSR_STLBPGSIZE, v);
+ SET_HW_GCSR(csr, id, LOONGARCH_CSR_RVACFG, v);
+ SET_HW_GCSR(csr, id, LOONGARCH_CSR_CPUID, v);
+ SET_HW_GCSR(csr, id, LOONGARCH_CSR_KS0, v);
+ SET_HW_GCSR(csr, id, LOONGARCH_CSR_KS1, v);
+ SET_HW_GCSR(csr, id, LOONGARCH_CSR_KS2, v);
+ SET_HW_GCSR(csr, id, LOONGARCH_CSR_KS3, v);
+ SET_HW_GCSR(csr, id, LOONGARCH_CSR_KS4, v);
+ SET_HW_GCSR(csr, id, LOONGARCH_CSR_KS5, v);
+ SET_HW_GCSR(csr, id, LOONGARCH_CSR_KS6, v);
+ SET_HW_GCSR(csr, id, LOONGARCH_CSR_KS7, v);
+ SET_HW_GCSR(csr, id, LOONGARCH_CSR_TMID, v);
+ SET_HW_GCSR(csr, id, LOONGARCH_CSR_TCFG, v);
+ SET_HW_GCSR(csr, id, LOONGARCH_CSR_TVAL, v);
+ SET_HW_GCSR(csr, id, LOONGARCH_CSR_CNTC, v);
+ SET_HW_GCSR(csr, id, LOONGARCH_CSR_LLBCTL, v);
+ SET_HW_GCSR(csr, id, LOONGARCH_CSR_TLBRENTRY, v);
+ SET_HW_GCSR(csr, id, LOONGARCH_CSR_TLBRBADV, v);
+ SET_HW_GCSR(csr, id, LOONGARCH_CSR_TLBRERA, v);
+ SET_HW_GCSR(csr, id, LOONGARCH_CSR_TLBRSAVE, v);
+ SET_HW_GCSR(csr, id, LOONGARCH_CSR_TLBRELO0, v);
+ SET_HW_GCSR(csr, id, LOONGARCH_CSR_TLBRELO1, v);
+ SET_HW_GCSR(csr, id, LOONGARCH_CSR_TLBREHI, v);
+ SET_HW_GCSR(csr, id, LOONGARCH_CSR_TLBRPRMD, v);
+ SET_HW_GCSR(csr, id, LOONGARCH_CSR_DMWIN0, v);
+ SET_HW_GCSR(csr, id, LOONGARCH_CSR_DMWIN1, v);
+ SET_HW_GCSR(csr, id, LOONGARCH_CSR_DMWIN2, v);
+ SET_HW_GCSR(csr, id, LOONGARCH_CSR_DMWIN3, v);
+ SET_HW_GCSR(csr, id, LOONGARCH_CSR_MWPS, v);
+ SET_HW_GCSR(csr, id, LOONGARCH_CSR_FWPS, v);
+
+ SET_SW_GCSR(csr, id, LOONGARCH_CSR_IMPCTL1, v);
+ SET_SW_GCSR(csr, id, LOONGARCH_CSR_IMPCTL2, v);
+ SET_SW_GCSR(csr, id, LOONGARCH_CSR_MERRCTL, v);
+ SET_SW_GCSR(csr, id, LOONGARCH_CSR_MERRINFO1, v);
+ SET_SW_GCSR(csr, id, LOONGARCH_CSR_MERRINFO2, v);
+ SET_SW_GCSR(csr, id, LOONGARCH_CSR_MERRENTRY, v);
+ SET_SW_GCSR(csr, id, LOONGARCH_CSR_MERRERA, v);
+ SET_SW_GCSR(csr, id, LOONGARCH_CSR_MERRSAVE, v);
+ SET_SW_GCSR(csr, id, LOONGARCH_CSR_CTAG, v);
+ SET_SW_GCSR(csr, id, LOONGARCH_CSR_DEBUG, v);
+ SET_SW_GCSR(csr, id, LOONGARCH_CSR_DERA, v);
+ SET_SW_GCSR(csr, id, LOONGARCH_CSR_DESAVE, v);
+ SET_SW_GCSR(csr, id, LOONGARCH_CSR_PRCFG1, v);
+ SET_SW_GCSR(csr, id, LOONGARCH_CSR_PRCFG2, v);
+ SET_SW_GCSR(csr, id, LOONGARCH_CSR_PRCFG3, v);
+
+ SET_SW_GCSR(csr, id, LOONGARCH_CSR_PGD, v);
+ SET_SW_GCSR(csr, id, LOONGARCH_CSR_TINTCLR, v);
+
+ ret = -1;
+ switch (id) {
+ case LOONGARCH_CSR_ESTAT:
+ write_gcsr_estat(*v);
+ /* estat IP0~IP7 inject through guestexcept */
+ write_csr_gintc(((*v) >> 2) & 0xff);
+ ret = 0;
+ break;
+ default:
+ if (force && (id < CSR_ALL_SIZE)) {
+ kvm_set_sw_gcsr(csr, id, *v);
+ ret = 0;
+ }
+ break;
+ }
+
+ return ret;
+}
+
+static int _kvm_get_one_reg(struct kvm_vcpu *vcpu,
+ const struct kvm_one_reg *reg, s64 *v)
+{
+ struct loongarch_csrs *csr = vcpu->arch.csr;
+ int reg_idx, ret;
+
+ if ((reg->id & KVM_IOC_CSRID(0)) == KVM_IOC_CSRID(0)) {
+ reg_idx = KVM_GET_IOC_CSRIDX(reg->id);
+ ret = _kvm_getcsr(vcpu, reg_idx, v, 0);
+ if (ret == 0)
+ return ret;
+ }
+
+ switch (reg->id) {
+ case KVM_REG_LOONGARCH_COUNTER:
+ *v = drdtime() + vcpu->kvm->arch.time_offset;
+ break;
+ default:
+ if ((reg->id & KVM_REG_LOONGARCH_MASK) != KVM_REG_LOONGARCH_CSR)
+ return -EINVAL;
+
+ reg_idx = KVM_GET_IOC_CSRIDX(reg->id);
+ if (reg_idx < CSR_ALL_SIZE)
+ *v = kvm_read_sw_gcsr(csr, reg_idx);
+ else
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int _kvm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
+{
+ int ret;
+ s64 v;
+
+ ret = _kvm_get_one_reg(vcpu, reg, &v);
+ if (ret)
+ return ret;
+
+ ret = -EINVAL;
+ if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U64) {
+ u64 __user *uaddr = (u64 __user *)(long)reg->addr;
+
+ ret = put_user(v, uaddr);
+ } else if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U32) {
+ u32 __user *uaddr = (u32 __user *)(long)reg->addr;
+ u32 v32 = (u32)v;
+
+ ret = put_user(v32, uaddr);
+ }
+
+ return ret;
+}
+
+static int _kvm_set_one_reg(struct kvm_vcpu *vcpu,
+ const struct kvm_one_reg *reg,
+ s64 v)
+{
+ struct loongarch_csrs *csr = vcpu->arch.csr;
+ int ret = 0;
+ unsigned long flags;
+ u64 val;
+ int reg_idx;
+
+ val = v;
+ if ((reg->id & KVM_IOC_CSRID(0)) == KVM_IOC_CSRID(0)) {
+ reg_idx = KVM_GET_IOC_CSRIDX(reg->id);
+ ret = _kvm_setcsr(vcpu, reg_idx, &val, 0);
+ if (ret == 0)
+ return ret;
+ }
+
+ switch (reg->id) {
+ case KVM_REG_LOONGARCH_COUNTER:
+ local_irq_save(flags);
+ /*
+ * gftoffset is relative with board, not vcpu
+ * only set for the first time for smp system
+ */
+ if (vcpu->vcpu_id == 0)
+ vcpu->kvm->arch.time_offset = (signed long)(v - drdtime());
+ write_csr_gcntc((ulong)vcpu->kvm->arch.time_offset);
+ local_irq_restore(flags);
+ break;
+ case KVM_REG_LOONGARCH_VCPU_RESET:
+ kvm_reset_timer(vcpu);
+ memset(&vcpu->arch.irq_pending, 0, sizeof(vcpu->arch.irq_pending));
+ memset(&vcpu->arch.irq_clear, 0, sizeof(vcpu->arch.irq_clear));
+ break;
+ default:
+ if ((reg->id & KVM_REG_LOONGARCH_MASK) != KVM_REG_LOONGARCH_CSR)
+ return -EINVAL;
+
+ reg_idx = KVM_GET_IOC_CSRIDX(reg->id);
+ if (reg_idx < CSR_ALL_SIZE)
+ kvm_write_sw_gcsr(csr, reg_idx, v);
+ else
+ return -EINVAL;
+ }
+ return ret;
+}
+
+static int _kvm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
+{
+ s64 v;
+ int ret;
+
+ ret = -EINVAL;
+ if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U64) {
+ u64 __user *uaddr;
+
+ uaddr = (u64 __user *)(long)reg->addr;
+ ret = get_user(v, uaddr);
+ } else if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U32) {
+ u32 __user *uaddr;
+ s32 v32;
+
+ uaddr = (u32 __user *)(long)reg->addr;
+ ret = get_user(v32, uaddr);
+ v = (s64)v32;
+ }
+
+ if (ret)
+ return -EFAULT;
+
+ return _kvm_set_one_reg(vcpu, reg, v);
+}
+
+/*
+ * Read or write a bunch of csrs. All parameters are kernel addresses.
+ *
+ * @return number of csrs set successfully.
+ */
+static int _kvm_csr_io(struct kvm_vcpu *vcpu, struct kvm_csrs *csrs,
+ struct kvm_csr_entry *entries,
+ int (*do_csr)(struct kvm_vcpu *vcpu,
+ unsigned int index, u64 *data, int force))
+{
+ int i;
+
+ for (i = 0; i < csrs->ncsrs; ++i)
+ if (do_csr(vcpu, entries[i].index, &entries[i].data, 1))
+ break;
+
+ return i;
+}
+
+static int kvm_csr_io(struct kvm_vcpu *vcpu, struct kvm_csrs __user *user_csrs,
+ int (*do_csr)(struct kvm_vcpu *vcpu,
+ unsigned int index, u64 *data, int force))
+{
+ struct kvm_csrs csrs;
+ struct kvm_csr_entry *entries;
+ int r, n;
+ unsigned int size;
+
+ r = -EFAULT;
+ if (copy_from_user(&csrs, user_csrs, sizeof(csrs)))
+ goto out;
+
+ r = -E2BIG;
+ if (csrs.ncsrs >= CSR_ALL_SIZE)
+ goto out;
+
+ size = sizeof(struct kvm_csr_entry) * csrs.ncsrs;
+ entries = memdup_user(user_csrs->entries, size);
+ if (IS_ERR(entries)) {
+ r = PTR_ERR(entries);
+ goto out;
+ }
+
+ r = n = _kvm_csr_io(vcpu, &csrs, entries, do_csr);
+ if (r < 0)
+ goto out_free;
+
+ r = -EFAULT;
+ if (copy_to_user(user_csrs->entries, entries, size))
+ goto out_free;
+
+ r = n;
+
+out_free:
+ kfree(entries);
+out:
+ return r;
+}
+
+int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
+ struct kvm_sregs *sregs)
+{
+ return -ENOIOCTLCMD;
+}
+
+int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
+ struct kvm_sregs *sregs)
+{
+ return -ENOIOCTLCMD;
+}
+
+int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
+{
+ int i;
+
+ vcpu_load(vcpu);
+
+ for (i = 0; i < ARRAY_SIZE(vcpu->arch.gprs); i++)
+ regs->gpr[i] = vcpu->arch.gprs[i];
+
+ regs->pc = vcpu->arch.pc;
+
+ vcpu_put(vcpu);
+ return 0;
+}
+
+int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
+{
+ int i;
+
+ vcpu_load(vcpu);
+
+ for (i = 1; i < ARRAY_SIZE(vcpu->arch.gprs); i++)
+ vcpu->arch.gprs[i] = regs->gpr[i];
+ vcpu->arch.gprs[0] = 0; /* zero is special, and cannot be set. */
+ vcpu->arch.pc = regs->pc;
+
+ vcpu_put(vcpu);
+ return 0;
+}
+
+long kvm_arch_vcpu_ioctl(struct file *filp,
+ unsigned int ioctl, unsigned long arg)
+{
+ struct kvm_vcpu *vcpu = filp->private_data;
+ void __user *argp = (void __user *)arg;
+ long r;
+
+ vcpu_load(vcpu);
+
+ switch (ioctl) {
+ case KVM_SET_ONE_REG:
+ case KVM_GET_ONE_REG: {
+ struct kvm_one_reg reg;
+
+ r = -EFAULT;
+ if (copy_from_user(®, argp, sizeof(reg)))
+ break;
+ if (ioctl == KVM_SET_ONE_REG)
+ r = _kvm_set_reg(vcpu, ®);
+ else
+ r = _kvm_get_reg(vcpu, ®);
+ break;
+ }
+ case KVM_GET_CSRS: {
+ r = kvm_csr_io(vcpu, argp, _kvm_getcsr);
+ break;
+ }
+ case KVM_SET_CSRS: {
+ r = kvm_csr_io(vcpu, argp, _kvm_setcsr);
+ break;
+ }
+ default:
+ r = -ENOIOCTLCMD;
+ break;
+ }
+
+ vcpu_put(vcpu);
+ return r;
+}
+
int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
{
return 0;
--
2.31.1
^ permalink raw reply related [flat|nested] 36+ messages in thread
* [PATCH v1 05/24] LoongArch: KVM: Implement vcpu ENABLE_CAP, CHECK_EXTENSION ioctl interface
2023-02-14 2:56 [PATCH v1 00/24] Add KVM LoongArch support Tianrui Zhao
` (3 preceding siblings ...)
2023-02-14 2:56 ` [PATCH v1 04/24] LoongArch: KVM: Implement vcpu get, vcpu set registers Tianrui Zhao
@ 2023-02-14 2:56 ` Tianrui Zhao
2023-02-14 2:56 ` [PATCH v1 06/24] LoongArch: KVM: Implement fpu related operations for vcpu Tianrui Zhao
` (18 subsequent siblings)
23 siblings, 0 replies; 36+ messages in thread
From: Tianrui Zhao @ 2023-02-14 2:56 UTC (permalink / raw)
To: Paolo Bonzini
Cc: Huacai Chen, WANG Xuerui, Greg Kroah-Hartman, loongarch,
linux-kernel, kvm, Jens Axboe, Mark Brown, Alex Deucher
Implement loongarch vcpu KVM_ENABLE_CAP, KVM_CHECK_EXTENSION ioctl
interface.
Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
---
arch/loongarch/kvm/vcpu.c | 46 +++++++++++++++++++++++++++++++++++++++
1 file changed, 46 insertions(+)
diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c
index a18864284..dd803f26d 100644
--- a/arch/loongarch/kvm/vcpu.c
+++ b/arch/loongarch/kvm/vcpu.c
@@ -415,6 +415,29 @@ int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
return 0;
}
+static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
+ struct kvm_enable_cap *cap)
+{
+ int r = 0;
+
+ if (!kvm_vm_ioctl_check_extension(vcpu->kvm, cap->cap))
+ return -EINVAL;
+ if (cap->flags)
+ return -EINVAL;
+ if (cap->args[0])
+ return -EINVAL;
+
+ switch (cap->cap) {
+ case KVM_CAP_LOONGARCH_FPU:
+ break;
+ default:
+ r = -EINVAL;
+ break;
+ }
+
+ return r;
+}
+
long kvm_arch_vcpu_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg)
{
@@ -438,6 +461,29 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
r = _kvm_get_reg(vcpu, ®);
break;
}
+ case KVM_ENABLE_CAP: {
+ struct kvm_enable_cap cap;
+
+ r = -EFAULT;
+ if (copy_from_user(&cap, argp, sizeof(cap)))
+ break;
+ r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
+ break;
+ }
+ case KVM_CHECK_EXTENSION: {
+ unsigned int ext;
+
+ if (copy_from_user(&ext, argp, sizeof(ext)))
+ return -EFAULT;
+ switch (ext) {
+ case KVM_CAP_LOONGARCH_FPU:
+ r = !!cpu_has_fpu;
+ break;
+ default:
+ break;
+ }
+ break;
+ }
case KVM_GET_CSRS: {
r = kvm_csr_io(vcpu, argp, _kvm_getcsr);
break;
--
2.31.1
^ permalink raw reply related [flat|nested] 36+ messages in thread
* [PATCH v1 06/24] LoongArch: KVM: Implement fpu related operations for vcpu
2023-02-14 2:56 [PATCH v1 00/24] Add KVM LoongArch support Tianrui Zhao
` (4 preceding siblings ...)
2023-02-14 2:56 ` [PATCH v1 05/24] LoongArch: KVM: Implement vcpu ENABLE_CAP, CHECK_EXTENSION ioctl interface Tianrui Zhao
@ 2023-02-14 2:56 ` Tianrui Zhao
2023-02-14 2:56 ` [PATCH v1 07/24] LoongArch: KVM: Implement vcpu interrupt operations Tianrui Zhao
` (17 subsequent siblings)
23 siblings, 0 replies; 36+ messages in thread
From: Tianrui Zhao @ 2023-02-14 2:56 UTC (permalink / raw)
To: Paolo Bonzini
Cc: Huacai Chen, WANG Xuerui, Greg Kroah-Hartman, loongarch,
linux-kernel, kvm, Jens Axboe, Mark Brown, Alex Deucher
Implement loongarch fpu related interface for vcpu, such as get fpu, set
fpu, own fpu and lose fpu, etc.
Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
---
arch/loongarch/kvm/vcpu.c | 70 +++++++++++++++++++++++++++++++++++++++
1 file changed, 70 insertions(+)
diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c
index dd803f26d..ed569508f 100644
--- a/arch/loongarch/kvm/vcpu.c
+++ b/arch/loongarch/kvm/vcpu.c
@@ -501,6 +501,76 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
return r;
}
+int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
+{
+ int i = 0;
+
+ /* no need vcpu_load and vcpu_put */
+ fpu->fcsr = vcpu->arch.fpu.fcsr;
+ fpu->fcc = vcpu->arch.fpu.fcc;
+ for (i = 0; i < NUM_FPU_REGS; i++)
+ memcpy(&fpu->fpr[i], &vcpu->arch.fpu.fpr[i], FPU_REG_WIDTH / 64);
+
+ return 0;
+}
+
+int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
+{
+ int i = 0;
+
+ /* no need vcpu_load and vcpu_put */
+ vcpu->arch.fpu.fcsr = fpu->fcsr;
+ vcpu->arch.fpu.fcc = fpu->fcc;
+ for (i = 0; i < NUM_FPU_REGS; i++)
+ memcpy(&vcpu->arch.fpu.fpr[i], &fpu->fpr[i], FPU_REG_WIDTH / 64);
+
+ return 0;
+}
+
+/* Enable FPU for guest and restore context */
+void kvm_own_fpu(struct kvm_vcpu *vcpu)
+{
+ unsigned long sr;
+
+ preempt_disable();
+
+ sr = kvm_read_hw_gcsr(LOONGARCH_CSR_EUEN);
+
+ /*
+ * Enable FPU for guest
+ * We set FR and FRE according to guest context
+ */
+ set_csr_euen(CSR_EUEN_FPEN);
+
+ /* If guest FPU state not active, restore it now */
+ if (!(vcpu->arch.aux_inuse & KVM_LARCH_FPU)) {
+ kvm_restore_fpu(&vcpu->arch.fpu);
+ vcpu->arch.aux_inuse |= KVM_LARCH_FPU;
+ trace_kvm_aux(vcpu, KVM_TRACE_AUX_RESTORE, KVM_TRACE_AUX_FPU);
+ } else {
+ trace_kvm_aux(vcpu, KVM_TRACE_AUX_ENABLE, KVM_TRACE_AUX_FPU);
+ }
+
+ preempt_enable();
+}
+
+/* Save and disable FPU */
+void kvm_lose_fpu(struct kvm_vcpu *vcpu)
+{
+ preempt_disable();
+
+ if (vcpu->arch.aux_inuse & KVM_LARCH_FPU) {
+ kvm_save_fpu(&vcpu->arch.fpu);
+ vcpu->arch.aux_inuse &= ~KVM_LARCH_FPU;
+ trace_kvm_aux(vcpu, KVM_TRACE_AUX_SAVE, KVM_TRACE_AUX_FPU);
+
+ /* Disable FPU */
+ clear_csr_euen(CSR_EUEN_FPEN);
+ }
+
+ preempt_enable();
+}
+
int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
{
return 0;
--
2.31.1
^ permalink raw reply related [flat|nested] 36+ messages in thread
* [PATCH v1 07/24] LoongArch: KVM: Implement vcpu interrupt operations
2023-02-14 2:56 [PATCH v1 00/24] Add KVM LoongArch support Tianrui Zhao
` (5 preceding siblings ...)
2023-02-14 2:56 ` [PATCH v1 06/24] LoongArch: KVM: Implement fpu related operations for vcpu Tianrui Zhao
@ 2023-02-14 2:56 ` Tianrui Zhao
2023-02-14 2:56 ` [PATCH v1 08/24] LoongArch: KVM: Implement misc vcpu related interfaces Tianrui Zhao
` (16 subsequent siblings)
23 siblings, 0 replies; 36+ messages in thread
From: Tianrui Zhao @ 2023-02-14 2:56 UTC (permalink / raw)
To: Paolo Bonzini
Cc: Huacai Chen, WANG Xuerui, Greg Kroah-Hartman, loongarch,
linux-kernel, kvm, Jens Axboe, Mark Brown, Alex Deucher
Implement vcpu interrupt operations such as vcpu set irq and
vcpu clear irq, using set_gcsr_estat to set irq which is
parsed by the irq bitmap.
Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
---
arch/loongarch/kvm/interrupt.c | 126 +++++++++++++++++++++++++++++++++
arch/loongarch/kvm/vcpu.c | 45 ++++++++++++
2 files changed, 171 insertions(+)
create mode 100644 arch/loongarch/kvm/interrupt.c
diff --git a/arch/loongarch/kvm/interrupt.c b/arch/loongarch/kvm/interrupt.c
new file mode 100644
index 000000000..02267a71d
--- /dev/null
+++ b/arch/loongarch/kvm/interrupt.c
@@ -0,0 +1,126 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020-2023 Loongson Technology Corporation Limited
+ */
+
+#include <linux/errno.h>
+#include <linux/err.h>
+#include <asm/kvm_vcpu.h>
+
+static unsigned int int_to_coreint[LOONGARCH_EXC_MAX] = {
+ [LARCH_INT_TIMER] = CPU_TIMER,
+ [LARCH_INT_IPI] = CPU_IPI,
+ [LARCH_INT_SIP0] = CPU_SIP0,
+ [LARCH_INT_SIP1] = CPU_SIP1,
+ [LARCH_INT_IP0] = CPU_IP0,
+ [LARCH_INT_IP1] = CPU_IP1,
+ [LARCH_INT_IP2] = CPU_IP2,
+ [LARCH_INT_IP3] = CPU_IP3,
+ [LARCH_INT_IP4] = CPU_IP4,
+ [LARCH_INT_IP5] = CPU_IP5,
+ [LARCH_INT_IP6] = CPU_IP6,
+ [LARCH_INT_IP7] = CPU_IP7,
+};
+
+static int _kvm_irq_deliver(struct kvm_vcpu *vcpu, unsigned int priority)
+{
+ unsigned int irq = 0;
+
+ clear_bit(priority, &vcpu->arch.irq_pending);
+ if (priority < LOONGARCH_EXC_MAX)
+ irq = int_to_coreint[priority];
+
+ switch (priority) {
+ case LARCH_INT_TIMER:
+ case LARCH_INT_IPI:
+ case LARCH_INT_SIP0:
+ case LARCH_INT_SIP1:
+ set_gcsr_estat(irq);
+ break;
+
+ case LARCH_INT_IP0:
+ case LARCH_INT_IP1:
+ case LARCH_INT_IP2:
+ case LARCH_INT_IP3:
+ case LARCH_INT_IP4:
+ case LARCH_INT_IP5:
+ case LARCH_INT_IP6:
+ case LARCH_INT_IP7:
+ set_csr_gintc(irq);
+ break;
+
+ default:
+ break;
+ }
+
+ return 1;
+}
+
+static int _kvm_irq_clear(struct kvm_vcpu *vcpu, unsigned int priority)
+{
+ unsigned int irq = 0;
+
+ clear_bit(priority, &vcpu->arch.irq_clear);
+ if (priority < LOONGARCH_EXC_MAX)
+ irq = int_to_coreint[priority];
+
+ switch (priority) {
+ case LARCH_INT_TIMER:
+ case LARCH_INT_IPI:
+ case LARCH_INT_SIP0:
+ case LARCH_INT_SIP1:
+ clear_gcsr_estat(irq);
+ break;
+
+ case LARCH_INT_IP0:
+ case LARCH_INT_IP1:
+ case LARCH_INT_IP2:
+ case LARCH_INT_IP3:
+ case LARCH_INT_IP4:
+ case LARCH_INT_IP5:
+ case LARCH_INT_IP6:
+ case LARCH_INT_IP7:
+ clear_csr_gintc(irq);
+ break;
+
+ default:
+ break;
+ }
+
+ return 1;
+}
+
+void _kvm_deliver_intr(struct kvm_vcpu *vcpu)
+{
+ unsigned long *pending = &vcpu->arch.irq_pending;
+ unsigned long *pending_clr = &vcpu->arch.irq_clear;
+ unsigned int priority;
+
+ if (!(*pending) && !(*pending_clr))
+ return;
+
+ if (*pending_clr) {
+ priority = __ffs(*pending_clr);
+ while (priority <= LOONGARCH_EXC_IPNUM) {
+ _kvm_irq_clear(vcpu, priority);
+ priority = find_next_bit(pending_clr,
+ BITS_PER_BYTE * sizeof(*pending_clr),
+ priority + 1);
+ }
+ }
+
+ if (*pending) {
+ priority = __ffs(*pending);
+ while (priority <= LOONGARCH_EXC_IPNUM) {
+ _kvm_irq_deliver(vcpu, priority);
+ priority = find_next_bit(pending,
+ BITS_PER_BYTE * sizeof(*pending),
+ priority + 1);
+ }
+ }
+}
+
+int _kvm_pending_timer(struct kvm_vcpu *vcpu)
+{
+ return test_bit(LARCH_INT_TIMER, &vcpu->arch.irq_pending);
+}
diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c
index ed569508f..3e94b8537 100644
--- a/arch/loongarch/kvm/vcpu.c
+++ b/arch/loongarch/kvm/vcpu.c
@@ -571,6 +571,51 @@ void kvm_lose_fpu(struct kvm_vcpu *vcpu)
preempt_enable();
}
+int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
+ struct kvm_loongarch_interrupt *irq)
+{
+ int intr = (int)irq->irq;
+ struct kvm_vcpu *dvcpu = NULL;
+
+ if (irq->cpu == -1)
+ dvcpu = vcpu;
+ else
+ dvcpu = kvm_get_vcpu(vcpu->kvm, irq->cpu);
+
+ if (intr > 0)
+ _kvm_queue_irq(dvcpu, intr);
+ else if (intr < 0)
+ _kvm_dequeue_irq(dvcpu, -intr);
+ else {
+ kvm_err("%s: invalid interrupt ioctl (%d:%d)\n", __func__,
+ irq->cpu, irq->irq);
+ return -EINVAL;
+ }
+
+ kvm_vcpu_kick(dvcpu);
+ return 0;
+}
+
+long kvm_arch_vcpu_async_ioctl(struct file *filp,
+ unsigned int ioctl, unsigned long arg)
+{
+ struct kvm_vcpu *vcpu = filp->private_data;
+ void __user *argp = (void __user *)arg;
+
+ if (ioctl == KVM_INTERRUPT) {
+ struct kvm_loongarch_interrupt irq;
+
+ if (copy_from_user(&irq, argp, sizeof(irq)))
+ return -EFAULT;
+ kvm_debug("[%d] %s: irq: %d\n", vcpu->vcpu_id, __func__,
+ irq.irq);
+
+ return kvm_vcpu_ioctl_interrupt(vcpu, &irq);
+ }
+
+ return -ENOIOCTLCMD;
+}
+
int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
{
return 0;
--
2.31.1
^ permalink raw reply related [flat|nested] 36+ messages in thread
* [PATCH v1 08/24] LoongArch: KVM: Implement misc vcpu related interfaces
2023-02-14 2:56 [PATCH v1 00/24] Add KVM LoongArch support Tianrui Zhao
` (6 preceding siblings ...)
2023-02-14 2:56 ` [PATCH v1 07/24] LoongArch: KVM: Implement vcpu interrupt operations Tianrui Zhao
@ 2023-02-14 2:56 ` Tianrui Zhao
2023-02-14 2:56 ` [PATCH v1 09/24] LoongArch: KVM: Implement vcpu load and vcpu put operations Tianrui Zhao
` (15 subsequent siblings)
23 siblings, 0 replies; 36+ messages in thread
From: Tianrui Zhao @ 2023-02-14 2:56 UTC (permalink / raw)
To: Paolo Bonzini
Cc: Huacai Chen, WANG Xuerui, Greg Kroah-Hartman, loongarch,
linux-kernel, kvm, Jens Axboe, Mark Brown, Alex Deucher
Implement some misc vcpu relaterd interfaces, such as vcpu runnable,
vcpu should kick, vcpu dump regs, etc.
Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
---
arch/loongarch/kvm/vcpu.c | 112 ++++++++++++++++++++++++++++++++++++++
1 file changed, 112 insertions(+)
diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c
index 3e94b8537..a4e825dd1 100644
--- a/arch/loongarch/kvm/vcpu.c
+++ b/arch/loongarch/kvm/vcpu.c
@@ -13,6 +13,118 @@
#define CREATE_TRACE_POINTS
#include "trace.h"
+int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
+{
+ return !!(vcpu->arch.irq_pending);
+}
+
+int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
+{
+ return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE;
+}
+
+bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu)
+{
+ return false;
+}
+
+vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
+{
+ return VM_FAULT_SIGBUS;
+}
+
+int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
+ struct kvm_translation *tr)
+{
+ return 0;
+}
+
+int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
+{
+ return _kvm_pending_timer(vcpu) ||
+ kvm_read_hw_gcsr(LOONGARCH_CSR_ESTAT) &
+ (1 << (EXCCODE_TIMER - EXCCODE_INT_START));
+}
+
+int kvm_arch_vcpu_dump_regs(struct kvm_vcpu *vcpu)
+{
+ int i;
+
+ if (!vcpu)
+ return -1;
+
+ kvm_debug("VCPU Register Dump:\n");
+ kvm_debug("\tpc = 0x%08lx\n", vcpu->arch.pc);
+ kvm_debug("\texceptions: %08lx\n", vcpu->arch.irq_pending);
+
+ for (i = 0; i < 32; i += 4) {
+ kvm_debug("\tgpr%02d: %08lx %08lx %08lx %08lx\n", i,
+ vcpu->arch.gprs[i],
+ vcpu->arch.gprs[i + 1],
+ vcpu->arch.gprs[i + 2], vcpu->arch.gprs[i + 3]);
+ }
+
+ kvm_debug("\tCRMOD: 0x%08llx, exst: 0x%08llx\n",
+ kvm_read_hw_gcsr(LOONGARCH_CSR_CRMD),
+ kvm_read_hw_gcsr(LOONGARCH_CSR_ESTAT));
+
+ kvm_debug("\tERA: 0x%08llx\n", kvm_read_hw_gcsr(LOONGARCH_CSR_ERA));
+
+ return 0;
+}
+
+int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
+ struct kvm_mp_state *mp_state)
+{
+ return -ENOIOCTLCMD;
+}
+
+int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
+ struct kvm_mp_state *mp_state)
+{
+ return -ENOIOCTLCMD;
+}
+
+int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
+ struct kvm_guest_debug *dbg)
+{
+ return -EINVAL;
+}
+
+static int lvcpu_stat_get(void *address, u64 *val)
+{
+ *val = *(u64 *)address;
+ return 0;
+}
+DEFINE_SIMPLE_ATTRIBUTE(lvcpu_stat_fops, lvcpu_stat_get, NULL, "%llu\n");
+
+static int vcpu_pid_get(void *arg, u64 *val)
+{
+ struct kvm_vcpu *vcpu = (struct kvm_vcpu *)arg;
+
+ if (vcpu)
+ *val = pid_vnr(vcpu->pid);
+ return 0;
+}
+DEFINE_SIMPLE_ATTRIBUTE(vcpu_pid_fops, vcpu_pid_get, NULL, "%llu\n");
+
+/**
+ * kvm_migrate_count() - Migrate timer.
+ * @vcpu: Virtual CPU.
+ *
+ * Migrate hrtimer to the current CPU by cancelling and restarting it
+ * if it was running prior to being cancelled.
+ *
+ * Must be called when the VCPU is migrated to a different CPU to ensure that
+ * timer expiry during guest execution interrupts the guest and causes the
+ * interrupt to be delivered in a timely manner.
+ */
+static void kvm_migrate_count(struct kvm_vcpu *vcpu)
+{
+ if (hrtimer_cancel(&vcpu->arch.swtimer))
+ hrtimer_restart(&vcpu->arch.swtimer);
+}
+
int _kvm_getcsr(struct kvm_vcpu *vcpu, unsigned int id, u64 *v, int force)
{
struct loongarch_csrs *csr = vcpu->arch.csr;
--
2.31.1
^ permalink raw reply related [flat|nested] 36+ messages in thread
* [PATCH v1 09/24] LoongArch: KVM: Implement vcpu load and vcpu put operations
2023-02-14 2:56 [PATCH v1 00/24] Add KVM LoongArch support Tianrui Zhao
` (7 preceding siblings ...)
2023-02-14 2:56 ` [PATCH v1 08/24] LoongArch: KVM: Implement misc vcpu related interfaces Tianrui Zhao
@ 2023-02-14 2:56 ` Tianrui Zhao
2023-02-14 2:56 ` [PATCH v1 10/24] LoongArch: KVM: Implement vcpu status description Tianrui Zhao
` (14 subsequent siblings)
23 siblings, 0 replies; 36+ messages in thread
From: Tianrui Zhao @ 2023-02-14 2:56 UTC (permalink / raw)
To: Paolo Bonzini
Cc: Huacai Chen, WANG Xuerui, Greg Kroah-Hartman, loongarch,
linux-kernel, kvm, Jens Axboe, Mark Brown, Alex Deucher
Implement loongarch vcpu load and vcpu put operations, including
load csr value into hardware and save csr value into vcpu structure.
Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
---
arch/loongarch/kvm/vcpu.c | 192 ++++++++++++++++++++++++++++++++++++++
1 file changed, 192 insertions(+)
diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c
index a4e825dd1..0228941ec 100644
--- a/arch/loongarch/kvm/vcpu.c
+++ b/arch/loongarch/kvm/vcpu.c
@@ -914,6 +914,198 @@ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
}
}
+static int _kvm_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
+{
+ struct kvm_context *context;
+ struct loongarch_csrs *csr = vcpu->arch.csr;
+ bool migrated, all;
+
+ /*
+ * Have we migrated to a different CPU?
+ * If so, any old guest TLB state may be stale.
+ */
+ migrated = (vcpu->arch.last_sched_cpu != cpu);
+
+ /*
+ * Was this the last VCPU to run on this CPU?
+ * If not, any old guest state from this VCPU will have been clobbered.
+ */
+ context = per_cpu_ptr(vcpu->kvm->arch.vmcs, cpu);
+ all = migrated || (context->last_vcpu != vcpu);
+ context->last_vcpu = vcpu;
+
+ /*
+ * Restore timer state regardless
+ */
+ kvm_restore_timer(vcpu);
+
+ /* Control guest page CCA attribute */
+ change_csr_gcfg(CSR_GCFG_MATC_MASK, CSR_GCFG_MATC_ROOT);
+ /* Don't bother restoring registers multiple times unless necessary */
+ if (!all)
+ return 0;
+
+ write_csr_gcntc((ulong)vcpu->kvm->arch.time_offset);
+ /*
+ * Restore guest CSR registers
+ */
+ kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_CRMD);
+ kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_PRMD);
+ kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_EUEN);
+ kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_MISC);
+ kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_ECFG);
+ kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_ERA);
+ kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_BADV);
+ kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_BADI);
+ kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_EENTRY);
+ kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBIDX);
+ kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBEHI);
+ kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBELO0);
+ kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBELO1);
+ kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_ASID);
+ kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_PGDL);
+ kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_PGDH);
+ kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_PWCTL0);
+ kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_PWCTL1);
+ kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_STLBPGSIZE);
+ kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_RVACFG);
+ kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_CPUID);
+ kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_KS0);
+ kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_KS1);
+ kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_KS2);
+ kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_KS3);
+ kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_KS4);
+ kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_KS5);
+ kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_KS6);
+ kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_KS7);
+ kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TMID);
+ kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_CNTC);
+ kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBRENTRY);
+ kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBRBADV);
+ kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBRERA);
+ kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBRSAVE);
+ kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBRELO0);
+ kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBRELO1);
+ kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBREHI);
+ kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBRPRMD);
+ kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_DMWIN0);
+ kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_DMWIN1);
+ kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_DMWIN2);
+ kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_DMWIN3);
+ kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_LLBCTL);
+
+ /* restore Root.Guestexcept from unused Guest guestexcept register */
+ write_csr_gintc(csr->csrs[LOONGARCH_CSR_GINTC]);
+
+ /*
+ * We should clear linked load bit to break interrupted atomics. This
+ * prevents a SC on the next VCPU from succeeding by matching a LL on
+ * the previous VCPU.
+ */
+ if (vcpu->kvm->created_vcpus > 1)
+ set_gcsr_llbctl(CSR_LLBCTL_WCLLB);
+
+ return 0;
+}
+
+void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
+{
+ unsigned long flags;
+
+ local_irq_save(flags);
+ vcpu->cpu = cpu;
+ if (vcpu->arch.last_sched_cpu != cpu) {
+ kvm_debug("[%d->%d]KVM VCPU[%d] switch\n",
+ vcpu->arch.last_sched_cpu, cpu, vcpu->vcpu_id);
+ /*
+ * Migrate the timer interrupt to the current CPU so that it
+ * always interrupts the guest and synchronously triggers a
+ * guest timer interrupt.
+ */
+ kvm_migrate_count(vcpu);
+ }
+
+ /* restore guest state to registers */
+ _kvm_vcpu_load(vcpu, cpu);
+ local_irq_restore(flags);
+}
+
+static int _kvm_vcpu_put(struct kvm_vcpu *vcpu, int cpu)
+{
+ struct loongarch_csrs *csr = vcpu->arch.csr;
+
+ kvm_lose_fpu(vcpu);
+
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_CRMD);
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_PRMD);
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_EUEN);
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_MISC);
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_ECFG);
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_ERA);
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_BADV);
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_BADI);
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_EENTRY);
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBIDX);
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBEHI);
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBELO0);
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBELO1);
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_ASID);
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_PGDL);
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_PGDH);
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_PGD);
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_PWCTL0);
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_PWCTL1);
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_STLBPGSIZE);
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_RVACFG);
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_CPUID);
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_PRCFG1);
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_PRCFG2);
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_PRCFG3);
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_KS0);
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_KS1);
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_KS2);
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_KS3);
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_KS4);
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_KS5);
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_KS6);
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_KS7);
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TMID);
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_CNTC);
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_LLBCTL);
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBRENTRY);
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBRBADV);
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBRERA);
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBRSAVE);
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBRELO0);
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBRELO1);
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBREHI);
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBRPRMD);
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_DMWIN0);
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_DMWIN1);
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_DMWIN2);
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_DMWIN3);
+
+ /* save Root.Guestexcept in unused Guest guestexcept register */
+ kvm_save_timer(vcpu);
+ csr->csrs[LOONGARCH_CSR_GINTC] = read_csr_gintc();
+ return 0;
+}
+
+void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
+{
+ unsigned long flags;
+ int cpu;
+
+ local_irq_save(flags);
+ cpu = smp_processor_id();
+ vcpu->arch.last_sched_cpu = cpu;
+ vcpu->cpu = -1;
+
+ /* save guest state in registers */
+ _kvm_vcpu_put(vcpu, cpu);
+ local_irq_restore(flags);
+}
+
int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
{
int r = -EINTR;
--
2.31.1
^ permalink raw reply related [flat|nested] 36+ messages in thread
* [PATCH v1 10/24] LoongArch: KVM: Implement vcpu status description
2023-02-14 2:56 [PATCH v1 00/24] Add KVM LoongArch support Tianrui Zhao
` (8 preceding siblings ...)
2023-02-14 2:56 ` [PATCH v1 09/24] LoongArch: KVM: Implement vcpu load and vcpu put operations Tianrui Zhao
@ 2023-02-14 2:56 ` Tianrui Zhao
2023-02-14 2:56 ` [PATCH v1 11/24] LoongArch: KVM: Implement update VM id function Tianrui Zhao
` (13 subsequent siblings)
23 siblings, 0 replies; 36+ messages in thread
From: Tianrui Zhao @ 2023-02-14 2:56 UTC (permalink / raw)
To: Paolo Bonzini
Cc: Huacai Chen, WANG Xuerui, Greg Kroah-Hartman, loongarch,
linux-kernel, kvm, Jens Axboe, Mark Brown, Alex Deucher
Implement loongarch vcpu status description such as idle exits counter,
signal exits counter, cpucfg exits counter, etc.
Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
---
arch/loongarch/kvm/vcpu.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c
index 0228941ec..0136ee3a1 100644
--- a/arch/loongarch/kvm/vcpu.c
+++ b/arch/loongarch/kvm/vcpu.c
@@ -13,6 +13,23 @@
#define CREATE_TRACE_POINTS
#include "trace.h"
+const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = {
+ KVM_GENERIC_VCPU_STATS(),
+ STATS_DESC_COUNTER(VCPU, idle_exits),
+ STATS_DESC_COUNTER(VCPU, signal_exits),
+ STATS_DESC_COUNTER(VCPU, int_exits),
+ STATS_DESC_COUNTER(VCPU, cpucfg_exits),
+};
+
+const struct kvm_stats_header kvm_vcpu_stats_header = {
+ .name_size = KVM_STATS_NAME_SIZE,
+ .num_desc = ARRAY_SIZE(kvm_vcpu_stats_desc),
+ .id_offset = sizeof(struct kvm_stats_header),
+ .desc_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE,
+ .data_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE +
+ sizeof(kvm_vcpu_stats_desc),
+};
+
int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
{
return !!(vcpu->arch.irq_pending);
--
2.31.1
^ permalink raw reply related [flat|nested] 36+ messages in thread
* [PATCH v1 11/24] LoongArch: KVM: Implement update VM id function
2023-02-14 2:56 [PATCH v1 00/24] Add KVM LoongArch support Tianrui Zhao
` (9 preceding siblings ...)
2023-02-14 2:56 ` [PATCH v1 10/24] LoongArch: KVM: Implement vcpu status description Tianrui Zhao
@ 2023-02-14 2:56 ` Tianrui Zhao
2023-02-14 2:56 ` [PATCH v1 12/24] LoongArch: KVM: Implement virtual machine tlb operations Tianrui Zhao
` (12 subsequent siblings)
23 siblings, 0 replies; 36+ messages in thread
From: Tianrui Zhao @ 2023-02-14 2:56 UTC (permalink / raw)
To: Paolo Bonzini
Cc: Huacai Chen, WANG Xuerui, Greg Kroah-Hartman, loongarch,
linux-kernel, kvm, Jens Axboe, Mark Brown, Alex Deucher
Implement kvm check vmid and update vmid, the vmid should be checked before
vcpu enter guest.
Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
---
arch/loongarch/kvm/vmid.c | 64 +++++++++++++++++++++++++++++++++++++++
1 file changed, 64 insertions(+)
create mode 100644 arch/loongarch/kvm/vmid.c
diff --git a/arch/loongarch/kvm/vmid.c b/arch/loongarch/kvm/vmid.c
new file mode 100644
index 000000000..82729968e
--- /dev/null
+++ b/arch/loongarch/kvm/vmid.c
@@ -0,0 +1,64 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020-2023 Loongson Technology Corporation Limited
+ */
+
+#include <linux/kvm_host.h>
+#include "trace.h"
+
+static void _kvm_update_vpid(struct kvm_vcpu *vcpu, int cpu)
+{
+ struct kvm_context *context;
+ unsigned long vpid;
+
+ context = per_cpu_ptr(vcpu->kvm->arch.vmcs, cpu);
+ vpid = context->vpid_cache + 1;
+ if (!(vpid & context->vpid_mask)) {
+ /* finish round of 64 bit loop */
+ if (unlikely(!vpid))
+ vpid = context->vpid_mask + 1;
+
+ /* vpid 0 reserved for root */
+ ++vpid;
+
+ /* start new vpid cycle */
+ kvm_flush_tlb_all();
+ }
+
+ context->vpid_cache = vpid;
+ vcpu->arch.vpid[cpu] = vpid;
+}
+
+void _kvm_check_vmid(struct kvm_vcpu *vcpu, int cpu)
+{
+ struct kvm_context *context;
+ bool migrated;
+ unsigned long ver, old, vpid;
+
+ /*
+ * Are we entering guest context on a different CPU to last time?
+ * If so, the VCPU's guest TLB state on this CPU may be stale.
+ */
+ context = per_cpu_ptr(vcpu->kvm->arch.vmcs, cpu);
+ migrated = (vcpu->arch.last_exec_cpu != cpu);
+ vcpu->arch.last_exec_cpu = cpu;
+
+ /*
+ * Check if our vpid is of an older version
+ *
+ * We also discard the stored vpid if we've executed on
+ * another CPU, as the guest mappings may have changed without
+ * hypervisor knowledge.
+ */
+ ver = vcpu->arch.vpid[cpu] & ~context->vpid_mask;
+ old = context->vpid_cache & ~context->vpid_mask;
+ if (migrated || (ver != old)) {
+ _kvm_update_vpid(vcpu, cpu);
+ trace_kvm_vpid_change(vcpu, vcpu->arch.vpid[cpu]);
+ }
+
+ /* Restore GSTAT(0x50).vpid */
+ vpid = (vcpu->arch.vpid[cpu] & context->vpid_mask)
+ << CSR_GSTAT_GID_SHIFT;
+ change_csr_gstat(context->vpid_mask << CSR_GSTAT_GID_SHIFT, vpid);
+}
--
2.31.1
^ permalink raw reply related [flat|nested] 36+ messages in thread
* [PATCH v1 12/24] LoongArch: KVM: Implement virtual machine tlb operations
2023-02-14 2:56 [PATCH v1 00/24] Add KVM LoongArch support Tianrui Zhao
` (10 preceding siblings ...)
2023-02-14 2:56 ` [PATCH v1 11/24] LoongArch: KVM: Implement update VM id function Tianrui Zhao
@ 2023-02-14 2:56 ` Tianrui Zhao
2023-02-14 2:56 ` [PATCH v1 13/24] LoongArch: KVM: Implement vcpu timer operations Tianrui Zhao
` (11 subsequent siblings)
23 siblings, 0 replies; 36+ messages in thread
From: Tianrui Zhao @ 2023-02-14 2:56 UTC (permalink / raw)
To: Paolo Bonzini
Cc: Huacai Chen, WANG Xuerui, Greg Kroah-Hartman, loongarch,
linux-kernel, kvm, Jens Axboe, Mark Brown, Alex Deucher
Implement loongarch virtual machine tlb operations such as flush tlb by
specific gpa parameter and flush all of the virt machines tlb.
Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
---
arch/loongarch/kvm/tlb.c | 31 +++++++++++++++++++++++++++++++
1 file changed, 31 insertions(+)
create mode 100644 arch/loongarch/kvm/tlb.c
diff --git a/arch/loongarch/kvm/tlb.c b/arch/loongarch/kvm/tlb.c
new file mode 100644
index 000000000..66e116cf2
--- /dev/null
+++ b/arch/loongarch/kvm/tlb.c
@@ -0,0 +1,31 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020-2023 Loongson Technology Corporation Limited
+ */
+
+#include <linux/kvm_host.h>
+#include <asm/tlb.h>
+
+int kvm_flush_tlb_gpa(struct kvm_vcpu *vcpu, unsigned long gpa)
+{
+ preempt_disable();
+ gpa &= (PAGE_MASK << 1);
+ invtlb(INVTLB_GID_ADDR, read_csr_gstat() & CSR_GSTAT_GID, gpa);
+ preempt_enable();
+ return 0;
+}
+
+/**
+ * kvm_flush_tlb_all() - Flush all root TLB entries for
+ * guests.
+ *
+ * Invalidate all entries including GVA-->GPA and GPA-->HPA mappings.
+ */
+void kvm_flush_tlb_all(void)
+{
+ unsigned long flags;
+
+ local_irq_save(flags);
+ invtlb_all(INVTLB_ALLGID, 0, 0);
+ local_irq_restore(flags);
+}
--
2.31.1
^ permalink raw reply related [flat|nested] 36+ messages in thread
* [PATCH v1 13/24] LoongArch: KVM: Implement vcpu timer operations
2023-02-14 2:56 [PATCH v1 00/24] Add KVM LoongArch support Tianrui Zhao
` (11 preceding siblings ...)
2023-02-14 2:56 ` [PATCH v1 12/24] LoongArch: KVM: Implement virtual machine tlb operations Tianrui Zhao
@ 2023-02-14 2:56 ` Tianrui Zhao
2023-02-14 2:56 ` [PATCH v1 14/24] LoongArch: KVM: Implement kvm mmu operations Tianrui Zhao
` (10 subsequent siblings)
23 siblings, 0 replies; 36+ messages in thread
From: Tianrui Zhao @ 2023-02-14 2:56 UTC (permalink / raw)
To: Paolo Bonzini
Cc: Huacai Chen, WANG Xuerui, Greg Kroah-Hartman, loongarch,
linux-kernel, kvm, Jens Axboe, Mark Brown, Alex Deucher
Implement loongarch vcpu timer operations such as init kvm timer,
require kvm timer, save kvm timer and restore kvm timer. When
vcpu exit, we use kvm soft timer to emulate hardware timer. If
timeout happens, the vcpu timer interrupt will be set and it is
going to be handled at vcpu next entrance.
Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
---
arch/loongarch/kvm/timer.c | 266 +++++++++++++++++++++++++++++++++++++
1 file changed, 266 insertions(+)
create mode 100644 arch/loongarch/kvm/timer.c
diff --git a/arch/loongarch/kvm/timer.c b/arch/loongarch/kvm/timer.c
new file mode 100644
index 000000000..2c7677248
--- /dev/null
+++ b/arch/loongarch/kvm/timer.c
@@ -0,0 +1,266 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020-2023 Loongson Technology Corporation Limited
+ */
+
+#include <linux/kvm_host.h>
+#include <asm/kvm_csr.h>
+#include <asm/kvm_vcpu.h>
+
+/* low level hrtimer wake routine */
+enum hrtimer_restart kvm_swtimer_wakeup(struct hrtimer *timer)
+{
+ struct kvm_vcpu *vcpu;
+
+ vcpu = container_of(timer, struct kvm_vcpu, arch.swtimer);
+ _kvm_queue_irq(vcpu, LARCH_INT_TIMER);
+ rcuwait_wake_up(&vcpu->wait);
+ return kvm_count_timeout(vcpu);
+}
+
+/*
+ * ktime_to_tick() - Scale ktime_t to a 64-bit stable timer.
+ *
+ * Caches the dynamic nanosecond bias in vcpu->arch.timer_dyn_bias.
+ */
+static unsigned long ktime_to_tick(struct kvm_vcpu *vcpu, ktime_t now)
+{
+ s64 now_ns, periods;
+ unsigned long delta;
+
+ now_ns = ktime_to_ns(now);
+ delta = now_ns + vcpu->arch.timer_dyn_bias;
+
+ if (delta >= vcpu->arch.timer_period) {
+ /* If delta is out of safe range the bias needs adjusting */
+ periods = div64_s64(now_ns, vcpu->arch.timer_period);
+ vcpu->arch.timer_dyn_bias = -periods * vcpu->arch.timer_period;
+ /* Recalculate delta with new bias */
+ delta = now_ns + vcpu->arch.timer_dyn_bias;
+ }
+
+ /*
+ * We've ensured that:
+ * delta < timer_period
+ */
+ return div_u64(delta * vcpu->arch.timer_mhz, MNSEC_PER_SEC);
+}
+
+/**
+ * kvm_resume_hrtimer() - Resume hrtimer, updating expiry.
+ * @vcpu: Virtual CPU.
+ * @now: ktime at point of resume.
+ * @val: stable timer at point of resume.
+ *
+ * Resumes the timer and updates the timer expiry based on @now and @count.
+ */
+static void kvm_resume_hrtimer(struct kvm_vcpu *vcpu, ktime_t now,
+ unsigned long val)
+{
+ unsigned long delta;
+ ktime_t expire;
+
+ /* Stable timer decreased to zero or
+ * initialize to zero, set 4 second timer
+ */
+ delta = div_u64(val * MNSEC_PER_SEC, vcpu->arch.timer_mhz);
+ expire = ktime_add_ns(now, delta);
+
+ /* Update hrtimer to use new timeout */
+ hrtimer_cancel(&vcpu->arch.swtimer);
+ hrtimer_start(&vcpu->arch.swtimer, expire, HRTIMER_MODE_ABS_PINNED);
+}
+
+/**
+ * kvm_init_timer() - Initialise stable timer.
+ * @vcpu: Virtual CPU.
+ * @timer_hz: Frequency of timer.
+ *
+ * Initialise the timer to the specified frequency, zero it, and set it going if
+ * it's enabled.
+ */
+void kvm_init_timer(struct kvm_vcpu *vcpu, unsigned long timer_hz)
+{
+ ktime_t now;
+ unsigned long ticks;
+ struct loongarch_csrs *csr = vcpu->arch.csr;
+
+ ticks = (unsigned long)MNSEC_PER_SEC * CSR_TCFG_VAL;
+ vcpu->arch.timer_mhz = timer_hz >> 20;
+ vcpu->arch.timer_period = div_u64(ticks, vcpu->arch.timer_mhz);
+ vcpu->arch.timer_dyn_bias = 0;
+
+ /* Starting at 0 */
+ ticks = 0;
+ now = ktime_get();
+ vcpu->arch.timer_bias = ticks - ktime_to_tick(vcpu, now);
+ vcpu->arch.timer_bias &= CSR_TCFG_VAL;
+ kvm_write_sw_gcsr(csr, LOONGARCH_CSR_TVAL, ticks);
+}
+
+/**
+ * kvm_count_timeout() - Push timer forward on timeout.
+ * @vcpu: Virtual CPU.
+ *
+ * Handle an hrtimer event by push the hrtimer forward a period.
+ *
+ * Returns: The hrtimer_restart value to return to the hrtimer subsystem.
+ */
+enum hrtimer_restart kvm_count_timeout(struct kvm_vcpu *vcpu)
+{
+ unsigned long cfg;
+
+ /* Add the Count period to the current expiry time */
+ cfg = kvm_read_sw_gcsr(vcpu->arch.csr, LOONGARCH_CSR_TCFG);
+ if (cfg & CSR_TCFG_PERIOD) {
+ hrtimer_add_expires_ns(&vcpu->arch.swtimer, cfg & CSR_TCFG_VAL);
+ return HRTIMER_RESTART;
+ } else
+ return HRTIMER_NORESTART;
+}
+
+/*
+ * kvm_restore_timer() - Restore timer state.
+ * @vcpu: Virtual CPU.
+ *
+ * Restore soft timer state from saved context.
+ */
+void kvm_restore_timer(struct kvm_vcpu *vcpu)
+{
+ struct loongarch_csrs *csr = vcpu->arch.csr;
+ ktime_t saved_ktime, now;
+ unsigned long val, new, delta;
+ int expired = 0;
+ unsigned long cfg;
+
+ /*
+ * Set guest stable timer cfg csr
+ */
+ cfg = kvm_read_sw_gcsr(csr, LOONGARCH_CSR_TCFG);
+ kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_ESTAT);
+ if (!(cfg & CSR_TCFG_EN)) {
+ kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TCFG);
+ kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TVAL);
+ return;
+ }
+
+ now = ktime_get();
+ saved_ktime = vcpu->arch.stable_ktime_saved;
+ val = kvm_read_sw_gcsr(csr, LOONGARCH_CSR_TVAL);
+
+ /*hrtimer not expire */
+ delta = ktime_to_tick(vcpu, ktime_sub(now, saved_ktime));
+ if (delta >= val) {
+ expired = 1;
+ if (cfg & CSR_TCFG_PERIOD)
+ new = (delta - val) % (cfg & CSR_TCFG_VAL);
+ else
+ new = 1;
+ } else
+ new = val - delta;
+
+ new &= CSR_TCFG_VAL;
+ write_gcsr_timercfg(cfg);
+ write_gcsr_timertick(new);
+ if (expired)
+ _kvm_queue_irq(vcpu, LARCH_INT_TIMER);
+}
+
+/*
+ * kvm_acquire_timer() - Switch to hard timer state.
+ * @vcpu: Virtual CPU.
+ *
+ * Restore hard timer state on top of existing soft timer state if possible.
+ *
+ * Since hard timer won't remain active over preemption, preemption should be
+ * disabled by the caller.
+ */
+void kvm_acquire_timer(struct kvm_vcpu *vcpu)
+{
+ unsigned long flags, guestcfg;
+
+ guestcfg = read_csr_gcfg();
+ if (!(guestcfg & CSR_GCFG_TIT))
+ return;
+
+ /* enable guest access to hard timer */
+ write_csr_gcfg(guestcfg & ~CSR_GCFG_TIT);
+
+ /*
+ * Freeze the soft-timer and sync the guest stable timer with it. We do
+ * this with interrupts disabled to avoid latency.
+ */
+ local_irq_save(flags);
+ hrtimer_cancel(&vcpu->arch.swtimer);
+ local_irq_restore(flags);
+}
+
+
+/*
+ * _kvm_save_timer() - Switch to software emulation of guest timer.
+ * @vcpu: Virtual CPU.
+ *
+ * Save guest timer state and switch to software emulation of guest
+ * timer. The hard timer must already be in use, so preemption should be
+ * disabled.
+ */
+static ktime_t _kvm_save_timer(struct kvm_vcpu *vcpu, unsigned long *val)
+{
+ unsigned long end_time;
+ ktime_t before_time;
+
+ before_time = ktime_get();
+
+ /*
+ * Record a final stable timer which we will transfer to the soft-timer.
+ */
+ end_time = read_gcsr_timertick();
+ *val = end_time;
+
+ kvm_resume_hrtimer(vcpu, before_time, end_time);
+ return before_time;
+}
+
+/*
+ * kvm_save_timer() - Save guest timer state.
+ * @vcpu: Virtual CPU.
+ *
+ * Save guest timer state and switch to soft guest timer if hard timer was in
+ * use.
+ */
+void kvm_save_timer(struct kvm_vcpu *vcpu)
+{
+ struct loongarch_csrs *csr = vcpu->arch.csr;
+ unsigned long guestcfg, val;
+ ktime_t save_ktime;
+
+ preempt_disable();
+ guestcfg = read_csr_gcfg();
+ if (!(guestcfg & CSR_GCFG_TIT)) {
+ /* disable guest use of hard timer */
+ write_csr_gcfg(guestcfg | CSR_GCFG_TIT);
+
+ /* save hard timer state */
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TCFG);
+ if (kvm_read_sw_gcsr(csr, LOONGARCH_CSR_TCFG) & CSR_TCFG_EN) {
+ save_ktime = _kvm_save_timer(vcpu, &val);
+ kvm_write_sw_gcsr(csr, LOONGARCH_CSR_TVAL, val);
+ vcpu->arch.stable_ktime_saved = save_ktime;
+ if (val == CSR_TCFG_VAL)
+ _kvm_queue_irq(vcpu, LARCH_INT_TIMER);
+ } else {
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TVAL);
+ }
+ }
+
+ /* save timer-related state to VCPU context */
+ kvm_save_hw_gcsr(csr, LOONGARCH_CSR_ESTAT);
+ preempt_enable();
+}
+
+void kvm_reset_timer(struct kvm_vcpu *vcpu)
+{
+ write_gcsr_timercfg(0);
+ kvm_write_sw_gcsr(vcpu->arch.csr, LOONGARCH_CSR_TCFG, 0);
+ hrtimer_cancel(&vcpu->arch.swtimer);
+}
--
2.31.1
^ permalink raw reply related [flat|nested] 36+ messages in thread
* [PATCH v1 14/24] LoongArch: KVM: Implement kvm mmu operations
2023-02-14 2:56 [PATCH v1 00/24] Add KVM LoongArch support Tianrui Zhao
` (12 preceding siblings ...)
2023-02-14 2:56 ` [PATCH v1 13/24] LoongArch: KVM: Implement vcpu timer operations Tianrui Zhao
@ 2023-02-14 2:56 ` Tianrui Zhao
2023-02-14 2:56 ` [PATCH v1 15/24] LoongArch: KVM: Implement handle csr excption Tianrui Zhao
` (9 subsequent siblings)
23 siblings, 0 replies; 36+ messages in thread
From: Tianrui Zhao @ 2023-02-14 2:56 UTC (permalink / raw)
To: Paolo Bonzini
Cc: Huacai Chen, WANG Xuerui, Greg Kroah-Hartman, loongarch,
linux-kernel, kvm, Jens Axboe, Mark Brown, Alex Deucher
Implement loongarch kvm mmu, it is used to switch gpa to hpa when
guest exit because of address translation exception. This patch
implement allocate gpa page table, search gpa from it and flush guest
gpa in the table.
Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
---
arch/loongarch/kvm/mmu.c | 821 +++++++++++++++++++++++++++++++++++++++
1 file changed, 821 insertions(+)
create mode 100644 arch/loongarch/kvm/mmu.c
diff --git a/arch/loongarch/kvm/mmu.c b/arch/loongarch/kvm/mmu.c
new file mode 100644
index 000000000..049824f8e
--- /dev/null
+++ b/arch/loongarch/kvm/mmu.c
@@ -0,0 +1,821 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020-2023 Loongson Technology Corporation Limited
+ */
+
+#include <linux/highmem.h>
+#include <linux/hugetlb.h>
+#include <linux/page-flags.h>
+#include <linux/kvm_host.h>
+#include <linux/uaccess.h>
+#include <asm/kvm_host.h>
+#include <asm/mmu_context.h>
+#include <asm/pgalloc.h>
+#include <asm/tlb.h>
+
+/*
+ * KVM_MMU_CACHE_MIN_PAGES is the number of GPA page table translation levels
+ * for which pages need to be cached.
+ */
+#if defined(__PAGETABLE_PMD_FOLDED)
+#define KVM_MMU_CACHE_MIN_PAGES 1
+#else
+#define KVM_MMU_CACHE_MIN_PAGES 2
+#endif
+
+/**
+ * kvm_pgd_alloc() - Allocate and initialise a KVM GPA page directory.
+ *
+ * Allocate a blank KVM GPA page directory (PGD) for representing guest physical
+ * to host physical page mappings.
+ *
+ * Returns: Pointer to new KVM GPA page directory.
+ * NULL on allocation failure.
+ */
+pgd_t *kvm_pgd_alloc(void)
+{
+ pgd_t *pgd;
+
+ pgd = (pgd_t *)__get_free_pages(GFP_KERNEL, 0);
+ if (pgd)
+ pgd_init((void *)pgd);
+
+ return pgd;
+}
+
+/**
+ * kvm_walk_pgd() - Walk page table with optional allocation.
+ * @pgd: Page directory pointer.
+ * @addr: Address to index page table using.
+ * @cache: MMU page cache to allocate new page tables from, or NULL.
+ *
+ * Walk the page tables pointed to by @pgd to find the PTE corresponding to the
+ * address @addr. If page tables don't exist for @addr, they will be created
+ * from the MMU cache if @cache is not NULL.
+ *
+ * Returns: Pointer to pte_t corresponding to @addr.
+ * NULL if a page table doesn't exist for @addr and !@cache.
+ * NULL if a page table allocation failed.
+ */
+static pte_t *kvm_walk_pgd(pgd_t *pgd, struct kvm_mmu_memory_cache *cache,
+ unsigned long addr)
+{
+ p4d_t *p4d;
+ pud_t *pud;
+ pmd_t *pmd;
+
+ pgd += pgd_index(addr);
+ if (pgd_none(*pgd)) {
+ /* Not used yet */
+ BUG();
+ return NULL;
+ }
+ p4d = p4d_offset(pgd, addr);
+ pud = pud_offset(p4d, addr);
+ if (pud_none(*pud)) {
+ pmd_t *new_pmd;
+
+ if (!cache)
+ return NULL;
+ new_pmd = kvm_mmu_memory_cache_alloc(cache);
+ pmd_init((void *)new_pmd);
+ pud_populate(NULL, pud, new_pmd);
+ }
+ pmd = pmd_offset(pud, addr);
+ if (pmd_none(*pmd)) {
+ pte_t *new_pte;
+
+ if (!cache)
+ return NULL;
+ new_pte = kvm_mmu_memory_cache_alloc(cache);
+ clear_page(new_pte);
+ pmd_populate_kernel(NULL, pmd, new_pte);
+ }
+ return pte_offset_kernel(pmd, addr);
+}
+
+/* Caller must hold kvm->mm_lock */
+static pte_t *kvm_pte_for_gpa(struct kvm *kvm,
+ struct kvm_mmu_memory_cache *cache,
+ unsigned long addr)
+{
+ return kvm_walk_pgd(kvm->arch.gpa_mm.pgd, cache, addr);
+}
+
+/*
+ * kvm_flush_gpa_{pte,pmd,pud,pgd,pt}.
+ * Flush a range of guest physical address space from the VM's GPA page tables.
+ */
+
+static bool kvm_flush_gpa_pte(pte_t *pte, unsigned long start_gpa,
+ unsigned long end_gpa, unsigned long *data)
+{
+ int i_min = pte_index(start_gpa);
+ int i_max = pte_index(end_gpa);
+ bool safe_to_remove = (i_min == 0 && i_max == PTRS_PER_PTE - 1);
+ int i;
+
+ for (i = i_min; i <= i_max; ++i) {
+ if (!pte_present(pte[i]))
+ continue;
+
+ set_pte(pte + i, __pte(0));
+ if (data)
+ *data += 1;
+ }
+ return safe_to_remove;
+}
+
+static bool kvm_flush_gpa_pmd(pmd_t *pmd, unsigned long start_gpa,
+ unsigned long end_gpa, unsigned long *data)
+{
+ pte_t *pte;
+ unsigned long end = ~0ul;
+ int i_min = pmd_index(start_gpa);
+ int i_max = pmd_index(end_gpa);
+ bool safe_to_remove = (i_min == 0 && i_max == PTRS_PER_PMD - 1);
+ int i;
+
+ for (i = i_min; i <= i_max; ++i, start_gpa = 0) {
+ if (!pmd_present(pmd[i]))
+ continue;
+
+ pte = pte_offset_kernel(pmd + i, 0);
+ if (i == i_max)
+ end = end_gpa;
+
+ if (kvm_flush_gpa_pte(pte, start_gpa, end, data)) {
+ pmd_clear(pmd + i);
+ pte_free_kernel(NULL, pte);
+ } else {
+ safe_to_remove = false;
+ }
+ }
+ return safe_to_remove;
+}
+
+static bool kvm_flush_gpa_pud(pud_t *pud, unsigned long start_gpa,
+ unsigned long end_gpa, unsigned long *data)
+{
+ pmd_t *pmd;
+ unsigned long end = ~0ul;
+ int i_min = pud_index(start_gpa);
+ int i_max = pud_index(end_gpa);
+ bool safe_to_remove = (i_min == 0 && i_max == PTRS_PER_PUD - 1);
+ int i;
+
+ for (i = i_min; i <= i_max; ++i, start_gpa = 0) {
+ if (!pud_present(pud[i]))
+ continue;
+
+ pmd = pmd_offset(pud + i, 0);
+ if (i == i_max)
+ end = end_gpa;
+
+ if (kvm_flush_gpa_pmd(pmd, start_gpa, end, data)) {
+ pud_clear(pud + i);
+ pmd_free(NULL, pmd);
+ } else {
+ safe_to_remove = false;
+ }
+ }
+ return safe_to_remove;
+}
+
+static bool kvm_flush_gpa_pgd(pgd_t *pgd, unsigned long start_gpa,
+ unsigned long end_gpa, unsigned long *data)
+{
+ p4d_t *p4d;
+ pud_t *pud;
+ unsigned long end = ~0ul;
+ int i_min = pgd_index(start_gpa);
+ int i_max = pgd_index(end_gpa);
+ bool safe_to_remove = (i_min == 0 && i_max == PTRS_PER_PGD - 1);
+ int i;
+
+ for (i = i_min; i <= i_max; ++i, start_gpa = 0) {
+ if (!pgd_present(pgd[i]))
+ continue;
+
+ p4d = p4d_offset(pgd, 0);
+ pud = pud_offset(p4d + i, 0);
+ if (i == i_max)
+ end = end_gpa;
+
+ if (kvm_flush_gpa_pud(pud, start_gpa, end, data)) {
+ pgd_clear(pgd + i);
+ pud_free(NULL, pud);
+ } else {
+ safe_to_remove = false;
+ }
+ }
+ return safe_to_remove;
+}
+
+/**
+ * kvm_flush_gpa_range() - Flush a range of guest physical addresses.
+ * @kvm: KVM pointer.
+ * @start_gfn: Guest frame number of first page in GPA range to flush.
+ * @end_gfn: Guest frame number of last page in GPA range to flush.
+ *
+ * Flushes a range of GPA mappings from the GPA page tables.
+ *
+ * The caller must hold the @kvm->mmu_lock spinlock.
+ *
+ * Returns: Whether its safe to remove the top level page directory because
+ * all lower levels have been removed.
+ */
+static bool kvm_flush_gpa_range(struct kvm *kvm, gfn_t start_gfn, gfn_t end_gfn, void *data)
+{
+ return kvm_flush_gpa_pgd(kvm->arch.gpa_mm.pgd,
+ start_gfn << PAGE_SHIFT,
+ end_gfn << PAGE_SHIFT, (unsigned long *)data);
+}
+
+/*
+ * kvm_mkclean_gpa_pt.
+ * Mark a range of guest physical address space clean (writes fault) in the VM's
+ * GPA page table to allow dirty page tracking.
+ */
+
+static int kvm_mkclean_pte(pte_t *pte, unsigned long start, unsigned long end)
+{
+ int ret = 0;
+ int i_min = pte_index(start);
+ int i_max = pte_index(end);
+ int i;
+ pte_t val;
+
+ for (i = i_min; i <= i_max; ++i) {
+ val = pte[i];
+ if (pte_present(val) && pte_dirty(val)) {
+ set_pte(pte + i, pte_mkclean(val));
+ ret = 1;
+ }
+ }
+ return ret;
+}
+
+static int kvm_mkclean_pmd(pmd_t *pmd, unsigned long start, unsigned long end)
+{
+ int ret = 0;
+ pte_t *pte;
+ unsigned long cur_end = ~0ul;
+ int i_min = pmd_index(start);
+ int i_max = pmd_index(end);
+ int i;
+
+ for (i = i_min; i <= i_max; ++i, start = 0) {
+ if (!pmd_present(pmd[i]))
+ continue;
+
+ pte = pte_offset_kernel(pmd + i, 0);
+ if (i == i_max)
+ cur_end = end;
+
+ ret |= kvm_mkclean_pte(pte, start, cur_end);
+ }
+
+ return ret;
+}
+
+static int kvm_mkclean_pud(pud_t *pud, unsigned long start, unsigned long end)
+{
+ int ret = 0;
+ pmd_t *pmd;
+ unsigned long cur_end = ~0ul;
+ int i_min = pud_index(start);
+ int i_max = pud_index(end);
+ int i;
+
+ for (i = i_min; i <= i_max; ++i, start = 0) {
+ if (!pud_present(pud[i]))
+ continue;
+
+ pmd = pmd_offset(pud + i, 0);
+ if (i == i_max)
+ cur_end = end;
+
+ ret |= kvm_mkclean_pmd(pmd, start, cur_end);
+ }
+ return ret;
+}
+
+static int kvm_mkclean_pgd(pgd_t *pgd, unsigned long start, unsigned long end)
+{
+ int ret = 0;
+ p4d_t *p4d;
+ pud_t *pud;
+ unsigned long cur_end = ~0ul;
+ int i_min = pgd_index(start);
+ int i_max = pgd_index(end);
+ int i;
+
+ for (i = i_min; i <= i_max; ++i, start = 0) {
+ if (!pgd_present(pgd[i]))
+ continue;
+
+ p4d = p4d_offset(pgd, 0);
+ pud = pud_offset(p4d + i, 0);
+ if (i == i_max)
+ cur_end = end;
+
+ ret |= kvm_mkclean_pud(pud, start, cur_end);
+ }
+ return ret;
+}
+
+/**
+ * kvm_mkclean_gpa_pt() - Make a range of guest physical addresses clean.
+ * @kvm: KVM pointer.
+ * @start_gfn: Guest frame number of first page in GPA range to flush.
+ * @end_gfn: Guest frame number of last page in GPA range to flush.
+ *
+ * Make a range of GPA mappings clean so that guest writes will fault and
+ * trigger dirty page logging.
+ *
+ * The caller must hold the @kvm->mmu_lock spinlock.
+ *
+ * Returns: Whether any GPA mappings were modified, which would require
+ * derived mappings (GVA page tables & TLB enties) to be
+ * invalidated.
+ */
+static int kvm_mkclean_gpa_pt(struct kvm *kvm, gfn_t start_gfn, gfn_t end_gfn)
+{
+ return kvm_mkclean_pgd(kvm->arch.gpa_mm.pgd, start_gfn << PAGE_SHIFT,
+ end_gfn << PAGE_SHIFT);
+}
+
+/**
+ * kvm_arch_mmu_enable_log_dirty_pt_masked() - write protect dirty pages
+ * @kvm: The KVM pointer
+ * @slot: The memory slot associated with mask
+ * @gfn_offset: The gfn offset in memory slot
+ * @mask: The mask of dirty pages at offset 'gfn_offset' in this memory
+ * slot to be write protected
+ *
+ * Walks bits set in mask write protects the associated pte's. Caller must
+ * acquire @kvm->mmu_lock.
+ */
+void kvm_arch_mmu_enable_log_dirty_pt_masked(struct kvm *kvm,
+ struct kvm_memory_slot *slot,
+ gfn_t gfn_offset, unsigned long mask)
+{
+ gfn_t base_gfn = slot->base_gfn + gfn_offset;
+ gfn_t start = base_gfn + __ffs(mask);
+ gfn_t end = base_gfn + __fls(mask);
+
+ kvm_mkclean_gpa_pt(kvm, start, end);
+}
+
+void kvm_arch_commit_memory_region(struct kvm *kvm,
+ struct kvm_memory_slot *old,
+ const struct kvm_memory_slot *new,
+ enum kvm_mr_change change)
+{
+ int needs_flush;
+
+ /*
+ * If dirty page logging is enabled, write protect all pages in the slot
+ * ready for dirty logging.
+ *
+ * There is no need to do this in any of the following cases:
+ * CREATE: No dirty mappings will already exist.
+ * MOVE/DELETE: The old mappings will already have been cleaned up by
+ * kvm_arch_flush_shadow_memslot()
+ */
+ if (change == KVM_MR_FLAGS_ONLY &&
+ (!(old->flags & KVM_MEM_LOG_DIRTY_PAGES) &&
+ new->flags & KVM_MEM_LOG_DIRTY_PAGES)) {
+ spin_lock(&kvm->mmu_lock);
+ /* Write protect GPA page table entries */
+ needs_flush = kvm_mkclean_gpa_pt(kvm, new->base_gfn,
+ new->base_gfn + new->npages - 1);
+ if (needs_flush)
+ kvm_flush_remote_tlbs(kvm);
+ spin_unlock(&kvm->mmu_lock);
+ }
+}
+
+void kvm_arch_flush_shadow_all(struct kvm *kvm)
+{
+ /* Flush whole GPA */
+ kvm_flush_gpa_range(kvm, 0, ~0UL, NULL);
+ /* Flush vpid for each VCPU individually */
+ kvm_flush_remote_tlbs(kvm);
+}
+
+void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
+ struct kvm_memory_slot *slot)
+{
+ unsigned long npages;
+
+ /*
+ * The slot has been made invalid (ready for moving or deletion), so we
+ * need to ensure that it can no longer be accessed by any guest VCPUs.
+ */
+
+ npages = 0;
+ spin_lock(&kvm->mmu_lock);
+ /* Flush slot from GPA */
+ kvm_flush_gpa_range(kvm, slot->base_gfn,
+ slot->base_gfn + slot->npages - 1, &npages);
+ /* Let implementation do the rest */
+ if (npages)
+ kvm_flush_remote_tlbs(kvm);
+ spin_unlock(&kvm->mmu_lock);
+}
+
+void _kvm_destroy_mm(struct kvm *kvm)
+{
+ /* It should always be safe to remove after flushing the whole range */
+ WARN_ON(!kvm_flush_gpa_range(kvm, 0, ~0UL, NULL));
+ pgd_free(NULL, kvm->arch.gpa_mm.pgd);
+ kvm->arch.gpa_mm.pgd = NULL;
+}
+
+/*
+ * Mark a range of guest physical address space old (all accesses fault) in the
+ * VM's GPA page table to allow detection of commonly used pages.
+ */
+
+static int kvm_mkold_pte(pte_t *pte, unsigned long start, unsigned long end)
+{
+ int ret = 0;
+ int i_min = pte_index(start);
+ int i_max = pte_index(end);
+ int i;
+ pte_t old, new;
+
+ for (i = i_min; i <= i_max; ++i) {
+ if (!pte_present(pte[i]))
+ continue;
+
+ old = pte[i];
+ new = pte_mkold(old);
+ if (pte_val(new) == pte_val(old))
+ continue;
+ set_pte(pte + i, new);
+ ret = 1;
+ }
+
+ return ret;
+}
+
+static int kvm_mkold_pmd(pmd_t *pmd, unsigned long start, unsigned long end)
+{
+ int ret = 0;
+ pte_t *pte;
+ unsigned long cur_end = ~0ul;
+ int i_min = pmd_index(start);
+ int i_max = pmd_index(end);
+ int i;
+
+ for (i = i_min; i <= i_max; ++i, start = 0) {
+ if (!pmd_present(pmd[i]))
+ continue;
+
+ pte = pte_offset_kernel(pmd + i, 0);
+ if (i == i_max)
+ cur_end = end;
+
+ ret |= kvm_mkold_pte(pte, start, cur_end);
+ }
+
+ return ret;
+}
+
+static int kvm_mkold_pud(pud_t *pud, unsigned long start, unsigned long end)
+{
+ int ret = 0;
+ pmd_t *pmd;
+ unsigned long cur_end = ~0ul;
+ int i_min = pud_index(start);
+ int i_max = pud_index(end);
+ int i;
+
+ for (i = i_min; i <= i_max; ++i, start = 0) {
+ if (!pud_present(pud[i]))
+ continue;
+
+ pmd = pmd_offset(pud + i, 0);
+ if (i == i_max)
+ cur_end = end;
+
+ ret |= kvm_mkold_pmd(pmd, start, cur_end);
+ }
+
+ return ret;
+}
+
+static int kvm_mkold_pgd(pgd_t *pgd, unsigned long start, unsigned long end)
+{
+ int ret = 0;
+ p4d_t *p4d;
+ pud_t *pud;
+ unsigned long cur_end = ~0ul;
+ int i_min = pgd_index(start);
+ int i_max = pgd_index(end);
+ int i;
+
+ for (i = i_min; i <= i_max; ++i, start = 0) {
+ if (!pgd_present(pgd[i]))
+ continue;
+
+ p4d = p4d_offset(pgd, 0);
+ pud = pud_offset(p4d + i, 0);
+ if (i == i_max)
+ cur_end = end;
+
+ ret |= kvm_mkold_pud(pud, start, cur_end);
+ }
+
+ return ret;
+}
+
+bool kvm_unmap_gfn_range(struct kvm *kvm, struct kvm_gfn_range *range)
+{
+ unsigned long npages = 0;
+
+ kvm_flush_gpa_range(kvm, range->start, range->end, &npages);
+ return npages > 0;
+}
+
+bool kvm_set_spte_gfn(struct kvm *kvm, struct kvm_gfn_range *range)
+{
+ gpa_t gpa = range->start << PAGE_SHIFT;
+ pte_t hva_pte = range->pte;
+ pte_t *ptep = kvm_pte_for_gpa(kvm, NULL, gpa);
+ pte_t old_pte;
+
+ if (!ptep)
+ return false;
+
+ /* Mapping may need adjusting depending on memslot flags */
+ old_pte = *ptep;
+ if (range->slot->flags & KVM_MEM_LOG_DIRTY_PAGES && !pte_dirty(old_pte))
+ hva_pte = pte_mkclean(hva_pte);
+ else if (range->slot->flags & KVM_MEM_READONLY)
+ hva_pte = pte_wrprotect(hva_pte);
+
+ set_pte(ptep, hva_pte);
+
+ /* Replacing an absent or old page doesn't need flushes */
+ if (!pte_present(old_pte) || !pte_young(old_pte))
+ return false;
+
+ /* Pages swapped, aged, moved, or cleaned require flushes */
+ return !pte_present(hva_pte) ||
+ !pte_young(hva_pte) ||
+ pte_pfn(old_pte) != pte_pfn(hva_pte) ||
+ (pte_dirty(old_pte) && !pte_dirty(hva_pte));
+}
+
+bool kvm_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range)
+{
+ return kvm_mkold_pgd(kvm->arch.gpa_mm.pgd, range->start << PAGE_SHIFT,
+ range->end << PAGE_SHIFT);
+}
+
+bool kvm_test_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range)
+{
+ gpa_t gpa = range->start << PAGE_SHIFT;
+ pte_t *ptep = kvm_pte_for_gpa(kvm, NULL, gpa);
+
+ if (ptep && pte_present(*ptep) && pte_young(*ptep))
+ return true;
+
+ return false;
+}
+
+/**
+ * kvm_map_page_fast() - Fast path GPA fault handler.
+ * @vcpu: VCPU pointer.
+ * @gpa: Guest physical address of fault.
+ * @write: Whether the fault was due to a write.
+ *
+ * Perform fast path GPA fault handling, doing all that can be done without
+ * calling into KVM. This handles marking old pages young (for idle page
+ * tracking), and dirtying of clean pages (for dirty page logging).
+ *
+ * Returns: 0 on success, in which case we can update derived mappings and
+ * resume guest execution.
+ * -EFAULT on failure due to absent GPA mapping or write to
+ * read-only page, in which case KVM must be consulted.
+ */
+static int kvm_map_page_fast(struct kvm_vcpu *vcpu, unsigned long gpa,
+ bool write)
+{
+ struct kvm *kvm = vcpu->kvm;
+ gfn_t gfn = gpa >> PAGE_SHIFT;
+ pte_t *ptep;
+ kvm_pfn_t pfn = 0;
+ bool pfn_valid = false;
+ int ret = 0;
+
+ spin_lock(&kvm->mmu_lock);
+
+ /* Fast path - just check GPA page table for an existing entry */
+ ptep = kvm_pte_for_gpa(kvm, NULL, gpa);
+ if (!ptep || !pte_present(*ptep)) {
+ ret = -EFAULT;
+ goto out;
+ }
+
+ /* Track access to pages marked old */
+ if (!pte_young(*ptep)) {
+ set_pte(ptep, pte_mkyoung(*ptep));
+ pfn = pte_pfn(*ptep);
+ pfn_valid = true;
+ /* call kvm_set_pfn_accessed() after unlock */
+ }
+ if (write && !pte_dirty(*ptep)) {
+ if (!pte_write(*ptep)) {
+ ret = -EFAULT;
+ goto out;
+ }
+
+ /* Track dirtying of writeable pages */
+ set_pte(ptep, pte_mkdirty(*ptep));
+ pfn = pte_pfn(*ptep);
+ mark_page_dirty(kvm, gfn);
+ kvm_set_pfn_dirty(pfn);
+ }
+
+out:
+ spin_unlock(&kvm->mmu_lock);
+ if (pfn_valid)
+ kvm_set_pfn_accessed(pfn);
+ return ret;
+}
+
+/**
+ * kvm_map_page() - Map a guest physical page.
+ * @vcpu: VCPU pointer.
+ * @gpa: Guest physical address of fault.
+ * @write: Whether the fault was due to a write.
+ *
+ * Handle GPA faults by creating a new GPA mapping (or updating an existing
+ * one).
+ *
+ * This takes care of marking pages young or dirty (idle/dirty page tracking),
+ * asking KVM for the corresponding PFN, and creating a mapping in the GPA page
+ * tables. Derived mappings (GVA page tables and TLBs) must be handled by the
+ * caller.
+ *
+ * Returns: 0 on success
+ * -EFAULT if there is no memory region at @gpa or a write was
+ * attempted to a read-only memory region. This is usually handled
+ * as an MMIO access.
+ */
+static int kvm_map_page(struct kvm_vcpu *vcpu, unsigned long gpa, bool write)
+{
+ bool writeable;
+ int srcu_idx, err = 0, retry_no = 0;
+ unsigned long hva;
+ unsigned long mmu_seq;
+ unsigned long prot_bits;
+ pte_t *ptep, new_pte;
+ kvm_pfn_t pfn;
+ gfn_t gfn = gpa >> PAGE_SHIFT;
+ struct vm_area_struct *vma;
+ struct kvm *kvm = vcpu->kvm;
+ struct kvm_memory_slot *memslot;
+ struct kvm_mmu_memory_cache *memcache = &vcpu->arch.mmu_page_cache;
+
+ /* Try the fast path to handle old / clean pages */
+ srcu_idx = srcu_read_lock(&kvm->srcu);
+ err = kvm_map_page_fast(vcpu, gpa, write);
+ if (!err)
+ goto out;
+
+ memslot = gfn_to_memslot(kvm, gfn);
+ hva = gfn_to_hva_memslot_prot(memslot, gfn, &writeable);
+ if (kvm_is_error_hva(hva) || (write && !writeable))
+ goto out;
+
+ /* Let's check if we will get back a huge page backed by hugetlbfs */
+ mmap_read_lock(current->mm);
+ vma = find_vma_intersection(current->mm, hva, hva + 1);
+ if (unlikely(!vma)) {
+ kvm_err("Failed to find VMA for hva 0x%lx\n", hva);
+ mmap_read_unlock(current->mm);
+ err = -EFAULT;
+ goto out;
+ }
+ mmap_read_unlock(current->mm);
+
+ /* We need a minimum of cached pages ready for page table creation */
+ err = kvm_mmu_topup_memory_cache(memcache, KVM_MMU_CACHE_MIN_PAGES);
+ if (err)
+ goto out;
+
+retry:
+ /*
+ * Used to check for invalidations in progress, of the pfn that is
+ * returned by pfn_to_pfn_prot below.
+ */
+ mmu_seq = kvm->mmu_invalidate_seq;
+ /*
+ * Ensure the read of mmu_invalidate_seq isn't reordered with PTE reads in
+ * gfn_to_pfn_prot() (which calls get_user_pages()), so that we don't
+ * risk the page we get a reference to getting unmapped before we have a
+ * chance to grab the mmu_lock without mmu_invalidate_retry() noticing.
+ *
+ * This smp_rmb() pairs with the effective smp_wmb() of the combination
+ * of the pte_unmap_unlock() after the PTE is zapped, and the
+ * spin_lock() in kvm_mmu_invalidate_invalidate_<page|range_end>() before
+ * mmu_invalidate_seq is incremented.
+ */
+ smp_rmb();
+
+ /* Slow path - ask KVM core whether we can access this GPA */
+ pfn = gfn_to_pfn_prot(kvm, gfn, write, &writeable);
+ if (is_error_noslot_pfn(pfn)) {
+ err = -EFAULT;
+ goto out;
+ }
+
+ spin_lock(&kvm->mmu_lock);
+ /* Check if an invalidation has taken place since we got pfn */
+ if (mmu_invalidate_retry(kvm, mmu_seq)) {
+ /*
+ * This can happen when mappings are changed asynchronously, but
+ * also synchronously if a COW is triggered by
+ * gfn_to_pfn_prot().
+ */
+ spin_unlock(&kvm->mmu_lock);
+ kvm_set_pfn_accessed(pfn);
+ kvm_release_pfn_clean(pfn);
+ if (retry_no > 100) {
+ retry_no = 0;
+ schedule();
+ }
+ retry_no++;
+ goto retry;
+ }
+
+ /*
+ * For emulated devices such virtio device, actual cache attribute is
+ * determined by physical machine.
+ * For pass through physical device, it should be uncachable
+ */
+ prot_bits = _PAGE_PRESENT | __READABLE;
+ if (vma->vm_flags & (VM_IO | VM_PFNMAP))
+ prot_bits |= _CACHE_SUC;
+ else
+ prot_bits |= _CACHE_CC;
+
+ if (writeable) {
+ prot_bits |= _PAGE_WRITE;
+ if (write) {
+ prot_bits |= __WRITEABLE;
+ mark_page_dirty(kvm, gfn);
+ kvm_set_pfn_dirty(pfn);
+ }
+ }
+
+ /* Ensure page tables are allocated */
+ ptep = kvm_pte_for_gpa(kvm, memcache, gpa);
+ new_pte = pfn_pte(pfn, __pgprot(prot_bits));
+ set_pte(ptep, new_pte);
+
+ err = 0;
+ spin_unlock(&kvm->mmu_lock);
+ kvm_release_pfn_clean(pfn);
+ kvm_set_pfn_accessed(pfn);
+out:
+ srcu_read_unlock(&kvm->srcu, srcu_idx);
+ return err;
+}
+
+int kvm_handle_mm_fault(struct kvm_vcpu *vcpu, unsigned long gpa, bool write)
+{
+ int ret;
+
+ ret = kvm_map_page(vcpu, gpa, write);
+ if (ret)
+ return ret;
+
+ /* Invalidate this entry in the TLB */
+ return kvm_flush_tlb_gpa(vcpu, gpa);
+}
+
+void kvm_arch_sync_dirty_log(struct kvm *kvm, struct kvm_memory_slot *memslot)
+{
+
+}
+
+int kvm_arch_prepare_memory_region(struct kvm *kvm,
+ const struct kvm_memory_slot *old,
+ struct kvm_memory_slot *new,
+ enum kvm_mr_change change)
+{
+ return 0;
+}
+
+void kvm_arch_flush_remote_tlbs_memslot(struct kvm *kvm,
+ const struct kvm_memory_slot *memslot)
+{
+ kvm_flush_remote_tlbs(kvm);
+}
--
2.31.1
^ permalink raw reply related [flat|nested] 36+ messages in thread
* [PATCH v1 15/24] LoongArch: KVM: Implement handle csr excption
2023-02-14 2:56 [PATCH v1 00/24] Add KVM LoongArch support Tianrui Zhao
` (13 preceding siblings ...)
2023-02-14 2:56 ` [PATCH v1 14/24] LoongArch: KVM: Implement kvm mmu operations Tianrui Zhao
@ 2023-02-14 2:56 ` Tianrui Zhao
2023-02-14 2:56 ` [PATCH v1 16/24] LoongArch: KVM: Implement handle iocsr exception Tianrui Zhao
` (8 subsequent siblings)
23 siblings, 0 replies; 36+ messages in thread
From: Tianrui Zhao @ 2023-02-14 2:56 UTC (permalink / raw)
To: Paolo Bonzini
Cc: Huacai Chen, WANG Xuerui, Greg Kroah-Hartman, loongarch,
linux-kernel, kvm, Jens Axboe, Mark Brown, Alex Deucher
Implement kvm handle loongarch vcpu exit caused by reading and
writing csr. Using loongarch_csr structure to emulate the registers.
Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
---
arch/loongarch/include/asm/kvm_csr.h | 89 +++++++++++++++++++++++
arch/loongarch/kvm/exit.c | 101 +++++++++++++++++++++++++++
2 files changed, 190 insertions(+)
create mode 100644 arch/loongarch/include/asm/kvm_csr.h
create mode 100644 arch/loongarch/kvm/exit.c
diff --git a/arch/loongarch/include/asm/kvm_csr.h b/arch/loongarch/include/asm/kvm_csr.h
new file mode 100644
index 000000000..44fcd724c
--- /dev/null
+++ b/arch/loongarch/include/asm/kvm_csr.h
@@ -0,0 +1,89 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020-2023 Loongson Technology Corporation Limited
+ */
+
+#ifndef __ASM_LOONGARCH_KVM_CSR_H__
+#define __ASM_LOONGARCH_KVM_CSR_H__
+#include <asm/loongarch.h>
+#include <asm/kvm_host.h>
+#include <asm/kvm_vcpu.h>
+#include <linux/uaccess.h>
+#include <linux/kvm_host.h>
+
+#define kvm_read_hw_gcsr(id) gcsr_read(id)
+#define kvm_write_hw_gcsr(csr, id, val) gcsr_write(val, id)
+
+int _kvm_getcsr(struct kvm_vcpu *vcpu, unsigned int id, u64 *v, int force);
+int _kvm_setcsr(struct kvm_vcpu *vcpu, unsigned int id, u64 *v, int force);
+
+int _kvm_emu_iocsr(larch_inst inst, struct kvm_run *run, struct kvm_vcpu *vcpu);
+
+static inline void kvm_save_hw_gcsr(struct loongarch_csrs *csr, int gid)
+{
+ csr->csrs[gid] = gcsr_read(gid);
+}
+
+static inline void kvm_restore_hw_gcsr(struct loongarch_csrs *csr, int gid)
+{
+ gcsr_write(csr->csrs[gid], gid);
+}
+
+static inline unsigned long kvm_read_sw_gcsr(struct loongarch_csrs *csr, int gid)
+{
+ return csr->csrs[gid];
+}
+
+static inline void kvm_write_sw_gcsr(struct loongarch_csrs *csr, int gid, unsigned long val)
+{
+ csr->csrs[gid] = val;
+}
+
+static inline void kvm_set_sw_gcsr(struct loongarch_csrs *csr, int gid, unsigned long val)
+{
+ csr->csrs[gid] |= val;
+}
+
+static inline void kvm_change_sw_gcsr(struct loongarch_csrs *csr, int gid, unsigned long mask,
+ unsigned long val)
+{
+ unsigned long _mask = mask;
+
+ csr->csrs[gid] &= ~_mask;
+ csr->csrs[gid] |= val & _mask;
+}
+
+
+#define GET_HW_GCSR(id, csrid, v) \
+ do { \
+ if (csrid == id) { \
+ *v = (long)kvm_read_hw_gcsr(csrid); \
+ return 0; \
+ } \
+ } while (0)
+
+#define GET_SW_GCSR(csr, id, csrid, v) \
+ do { \
+ if (csrid == id) { \
+ *v = kvm_read_sw_gcsr(csr, id); \
+ return 0; \
+ } \
+ } while (0)
+
+#define SET_HW_GCSR(csr, id, csrid, v) \
+ do { \
+ if (csrid == id) { \
+ kvm_write_hw_gcsr(csr, csrid, *v); \
+ return 0; \
+ } \
+ } while (0)
+
+#define SET_SW_GCSR(csr, id, csrid, v) \
+ do { \
+ if (csrid == id) { \
+ kvm_write_sw_gcsr(csr, csrid, *v); \
+ return 0; \
+ } \
+ } while (0)
+
+#endif /* __ASM_LOONGARCH_KVM_CSR_H__ */
diff --git a/arch/loongarch/kvm/exit.c b/arch/loongarch/kvm/exit.c
new file mode 100644
index 000000000..dc37827d9
--- /dev/null
+++ b/arch/loongarch/kvm/exit.c
@@ -0,0 +1,101 @@
+// 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>
+
+#define CREATE_TRACE_POINTS
+#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;
+
+ val = 0;
+ if (csrid < 4096)
+ 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 (csrid < 4096)
+ 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 (csrid < 4096) {
+ 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;
+}
--
2.31.1
^ permalink raw reply related [flat|nested] 36+ messages in thread
* [PATCH v1 16/24] LoongArch: KVM: Implement handle iocsr exception
2023-02-14 2:56 [PATCH v1 00/24] Add KVM LoongArch support Tianrui Zhao
` (14 preceding siblings ...)
2023-02-14 2:56 ` [PATCH v1 15/24] LoongArch: KVM: Implement handle csr excption Tianrui Zhao
@ 2023-02-14 2:56 ` Tianrui Zhao
2023-02-14 2:56 ` [PATCH v1 17/24] LoongArch: KVM: Implement handle idle exception Tianrui Zhao
` (7 subsequent siblings)
23 siblings, 0 replies; 36+ messages in thread
From: Tianrui Zhao @ 2023-02-14 2:56 UTC (permalink / raw)
To: Paolo Bonzini
Cc: Huacai Chen, WANG Xuerui, Greg Kroah-Hartman, loongarch,
linux-kernel, kvm, Jens Axboe, Mark Brown, Alex Deucher
Implement kvm handle vcpu iocsr exception, setting the iocsr info into
vcpu_run and return to user space to handle it.
Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
---
arch/loongarch/include/asm/inst.h | 16 ++++++
arch/loongarch/kvm/exit.c | 92 +++++++++++++++++++++++++++++++
2 files changed, 108 insertions(+)
diff --git a/arch/loongarch/include/asm/inst.h b/arch/loongarch/include/asm/inst.h
index 7eedd83fd..8ed137814 100644
--- a/arch/loongarch/include/asm/inst.h
+++ b/arch/loongarch/include/asm/inst.h
@@ -50,6 +50,14 @@ 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 {
@@ -261,6 +269,13 @@ struct reg3sa2_format {
unsigned int opcode : 15;
};
+struct reg2csr_format {
+ unsigned int rd : 5;
+ unsigned int rj : 5;
+ unsigned int csr : 14;
+ unsigned int opcode : 8;
+};
+
union loongarch_instruction {
unsigned int word;
struct reg0i26_format reg0i26_format;
@@ -275,6 +290,7 @@ union loongarch_instruction {
struct reg2bstrd_format reg2bstrd_format;
struct reg3_format reg3_format;
struct reg3sa2_format reg3sa2_format;
+ struct reg2csr_format reg2csr_format;
};
#define LOONGARCH_INSN_SIZE sizeof(union loongarch_instruction)
diff --git a/arch/loongarch/kvm/exit.c b/arch/loongarch/kvm/exit.c
index dc37827d9..f02e2b940 100644
--- a/arch/loongarch/kvm/exit.c
+++ b/arch/loongarch/kvm/exit.c
@@ -99,3 +99,95 @@ 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)
+{
+ u32 rd, rj, opcode;
+ u32 addr;
+ unsigned long val;
+ int ret;
+
+ /*
+ * 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)
+{
+ unsigned long *gpr = &vcpu->arch.gprs[vcpu->arch.io_gpr];
+ enum emulation_result er = EMULATE_DONE;
+
+ switch (run->iocsr_io.len) {
+ case 8:
+ *gpr = *(s64 *)run->iocsr_io.data;
+ break;
+ case 4:
+ *gpr = *(int *)run->iocsr_io.data;
+ break;
+ case 2:
+ *gpr = *(short *)run->iocsr_io.data;
+ break;
+ case 1:
+ *gpr = *(char *) run->iocsr_io.data;
+ break;
+ default:
+ kvm_err("Bad IOCSR length: %d,addr is 0x%lx",
+ run->iocsr_io.len, vcpu->arch.badv);
+ er = EMULATE_FAIL;
+ break;
+ }
+
+ return er;
+}
--
2.31.1
^ permalink raw reply related [flat|nested] 36+ messages in thread
* [PATCH v1 17/24] LoongArch: KVM: Implement handle idle exception
2023-02-14 2:56 [PATCH v1 00/24] Add KVM LoongArch support Tianrui Zhao
` (15 preceding siblings ...)
2023-02-14 2:56 ` [PATCH v1 16/24] LoongArch: KVM: Implement handle iocsr exception Tianrui Zhao
@ 2023-02-14 2:56 ` Tianrui Zhao
2023-02-14 2:56 ` [PATCH v1 18/24] LoongArch: KVM: Implement handle gspr exception Tianrui Zhao
` (6 subsequent siblings)
23 siblings, 0 replies; 36+ messages in thread
From: Tianrui Zhao @ 2023-02-14 2:56 UTC (permalink / raw)
To: Paolo Bonzini
Cc: Huacai Chen, WANG Xuerui, Greg Kroah-Hartman, loongarch,
linux-kernel, kvm, Jens Axboe, Mark Brown, Alex Deucher
Implement kvm handle loongarch vcpu idle exception, using kvm_vcpu_block
to emulate it.
Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
---
arch/loongarch/kvm/exit.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/arch/loongarch/kvm/exit.c b/arch/loongarch/kvm/exit.c
index f02e2b940..a6beb83a0 100644
--- a/arch/loongarch/kvm/exit.c
+++ b/arch/loongarch/kvm/exit.c
@@ -191,3 +191,15 @@ int _kvm_complete_iocsr_read(struct kvm_vcpu *vcpu, struct kvm_run *run)
return er;
}
+
+int _kvm_emu_idle(struct kvm_vcpu *vcpu)
+{
+ ++vcpu->stat.idle_exits;
+ trace_kvm_exit(vcpu, KVM_TRACE_EXIT_IDLE);
+ if (!vcpu->arch.irq_pending) {
+ kvm_save_timer(vcpu);
+ kvm_vcpu_block(vcpu);
+ }
+
+ return EMULATE_DONE;
+}
--
2.31.1
^ permalink raw reply related [flat|nested] 36+ messages in thread
* [PATCH v1 18/24] LoongArch: KVM: Implement handle gspr exception
2023-02-14 2:56 [PATCH v1 00/24] Add KVM LoongArch support Tianrui Zhao
` (16 preceding siblings ...)
2023-02-14 2:56 ` [PATCH v1 17/24] LoongArch: KVM: Implement handle idle exception Tianrui Zhao
@ 2023-02-14 2:56 ` Tianrui Zhao
2023-02-14 2:56 ` [PATCH v1 19/24] LoongArch: KVM: Implement handle mmio exception Tianrui Zhao
` (5 subsequent siblings)
23 siblings, 0 replies; 36+ messages in thread
From: Tianrui Zhao @ 2023-02-14 2:56 UTC (permalink / raw)
To: Paolo Bonzini
Cc: Huacai Chen, WANG Xuerui, Greg Kroah-Hartman, loongarch,
linux-kernel, kvm, Jens Axboe, Mark Brown, Alex Deucher
Implement kvm handle gspr exception interface, including emulate the
reading and writing of cpucfg, csr, iocsr resource.
Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
---
arch/loongarch/kvm/exit.c | 114 ++++++++++++++++++++++++++++++++++++++
1 file changed, 114 insertions(+)
diff --git a/arch/loongarch/kvm/exit.c b/arch/loongarch/kvm/exit.c
index a6beb83a0..75c61272b 100644
--- a/arch/loongarch/kvm/exit.c
+++ b/arch/loongarch/kvm/exit.c
@@ -203,3 +203,117 @@ int _kvm_emu_idle(struct kvm_vcpu *vcpu)
return EMULATE_DONE;
}
+
+static int _kvm_trap_handle_gspr(struct kvm_vcpu *vcpu)
+{
+ enum emulation_result er = EMULATE_DONE;
+ struct kvm_run *run = vcpu->run;
+ larch_inst inst;
+ unsigned long curr_pc;
+ int rd, rj;
+ unsigned int index;
+
+ /*
+ * Fetch the instruction.
+ */
+ inst.word = vcpu->arch.badi;
+ curr_pc = vcpu->arch.pc;
+ update_pc(&vcpu->arch);
+
+ er = EMULATE_FAIL;
+ switch (((inst.word >> 24) & 0xff)) {
+ case 0x0:
+ /* cpucfg GSPR */
+ if (inst.reg2_format.opcode == 0x1B) {
+ rd = inst.reg2_format.rd;
+ rj = inst.reg2_format.rj;
+ ++vcpu->stat.cpucfg_exits;
+ index = vcpu->arch.gprs[rj];
+
+ vcpu->arch.gprs[rd] = read_cpucfg(index);
+ /* Nested KVM is not supported */
+ if (index == 2)
+ vcpu->arch.gprs[rd] &= ~CPUCFG2_LVZP;
+ if (index == 6)
+ vcpu->arch.gprs[rd] &= ~CPUCFG6_PMP;
+ er = EMULATE_DONE;
+ }
+ break;
+ case 0x4:
+ /* csr GSPR */
+ er = _kvm_handle_csr(vcpu, inst);
+ break;
+ case 0x6:
+ /* iocsr,cache,idle GSPR */
+ switch (((inst.word >> 22) & 0x3ff)) {
+ case 0x18:
+ /* cache GSPR */
+ er = EMULATE_DONE;
+ trace_kvm_exit(vcpu, KVM_TRACE_EXIT_CACHE);
+ break;
+ case 0x19:
+ /* iocsr/idle GSPR */
+ switch (((inst.word >> 15) & 0x1ffff)) {
+ case 0xc90:
+ /* iocsr GSPR */
+ er = _kvm_emu_iocsr(inst, run, vcpu);
+ break;
+ case 0xc91:
+ /* idle GSPR */
+ er = _kvm_emu_idle(vcpu);
+ break;
+ default:
+ er = EMULATE_FAIL;
+ break;
+ }
+ break;
+ default:
+ er = EMULATE_FAIL;
+ break;
+ }
+ break;
+ default:
+ er = EMULATE_FAIL;
+ break;
+ }
+
+ /* Rollback PC only if emulation was unsuccessful */
+ if (er == EMULATE_FAIL) {
+ kvm_err("[%#lx]%s: unsupported gspr instruction 0x%08x\n",
+ curr_pc, __func__, inst.word);
+
+ kvm_arch_vcpu_dump_regs(vcpu);
+ vcpu->arch.pc = curr_pc;
+ }
+ return er;
+}
+
+/*
+ * Execute cpucfg instruction will tirggerGSPR,
+ * Also the access to unimplemented csrs 0x15
+ * 0x16, 0x50~0x53, 0x80, 0x81, 0x90~0x95, 0x98
+ * 0xc0~0xff, 0x100~0x109, 0x500~0x502,
+ * cache_op, idle_op iocsr ops the same
+ */
+static int _kvm_handle_gspr(struct kvm_vcpu *vcpu)
+{
+ enum emulation_result er = EMULATE_DONE;
+ int ret = RESUME_GUEST;
+
+ er = _kvm_trap_handle_gspr(vcpu);
+
+ if (er == EMULATE_DONE) {
+ ret = RESUME_GUEST;
+ } else if (er == EMULATE_DO_MMIO) {
+ vcpu->run->exit_reason = KVM_EXIT_MMIO;
+ ret = RESUME_HOST;
+ } else if (er == EMULATE_DO_IOCSR) {
+ vcpu->run->exit_reason = KVM_EXIT_LOONGARCH_IOCSR;
+ ret = RESUME_HOST;
+ } else {
+ kvm_err("%s internal error\n", __func__);
+ vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
+ ret = RESUME_HOST;
+ }
+ return ret;
+}
--
2.31.1
^ permalink raw reply related [flat|nested] 36+ messages in thread
* [PATCH v1 19/24] LoongArch: KVM: Implement handle mmio exception
2023-02-14 2:56 [PATCH v1 00/24] Add KVM LoongArch support Tianrui Zhao
` (17 preceding siblings ...)
2023-02-14 2:56 ` [PATCH v1 18/24] LoongArch: KVM: Implement handle gspr exception Tianrui Zhao
@ 2023-02-14 2:56 ` Tianrui Zhao
2023-02-14 2:56 ` [PATCH v1 20/24] LoongArch: KVM: Implement handle fpu exception Tianrui Zhao
` (4 subsequent siblings)
23 siblings, 0 replies; 36+ messages in thread
From: Tianrui Zhao @ 2023-02-14 2:56 UTC (permalink / raw)
To: Paolo Bonzini
Cc: Huacai Chen, WANG Xuerui, Greg Kroah-Hartman, loongarch,
linux-kernel, kvm, Jens Axboe, Mark Brown, Alex Deucher
Implement handle mmio exception, setting the mmio info into vcpu_run and
return to user space to handle it.
Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
---
arch/loongarch/kvm/exit.c | 308 ++++++++++++++++++++++++++++++++++++++
1 file changed, 308 insertions(+)
diff --git a/arch/loongarch/kvm/exit.c b/arch/loongarch/kvm/exit.c
index 75c61272b..30e64ba72 100644
--- a/arch/loongarch/kvm/exit.c
+++ b/arch/loongarch/kvm/exit.c
@@ -204,6 +204,265 @@ int _kvm_emu_idle(struct kvm_vcpu *vcpu)
return EMULATE_DONE;
}
+int _kvm_emu_mmio_write(struct kvm_vcpu *vcpu, larch_inst inst)
+{
+ struct kvm_run *run = vcpu->run;
+ unsigned int rd, op8, opcode;
+ unsigned long rd_val = 0;
+ void *data = run->mmio.data;
+ unsigned long curr_pc;
+ int ret;
+
+ /*
+ * Update PC and hold onto current PC in case there is
+ * an error and we want to rollback the PC
+ */
+ curr_pc = vcpu->arch.pc;
+ update_pc(&vcpu->arch);
+
+ op8 = (inst.word >> 24) & 0xff;
+ run->mmio.phys_addr = vcpu->arch.badv;
+ ret = EMULATE_DO_MMIO;
+ if (op8 < 0x28) {
+ /* stptrw/d process */
+ rd = inst.reg2i14_format.rd;
+ opcode = inst.reg2i14_format.opcode;
+
+ switch (opcode) {
+ case stptrd_op:
+ run->mmio.len = 8;
+ *(unsigned long *)data = vcpu->arch.gprs[rd];
+ break;
+ case stptrw_op:
+ run->mmio.len = 4;
+ *(unsigned int *)data = vcpu->arch.gprs[rd];
+ break;
+ default:
+ ret = EMULATE_FAIL;
+ break;
+ }
+ } else if (op8 < 0x30) {
+ /* st.b/h/w/d process */
+ rd = inst.reg2i12_format.rd;
+ opcode = inst.reg2i12_format.opcode;
+ rd_val = vcpu->arch.gprs[rd];
+
+ switch (opcode) {
+ case std_op:
+ run->mmio.len = 8;
+ *(unsigned long *)data = rd_val;
+ break;
+ case stw_op:
+ run->mmio.len = 4;
+ *(unsigned int *)data = rd_val;
+ break;
+ case sth_op:
+ run->mmio.len = 2;
+ *(unsigned short *)data = rd_val;
+ break;
+ case stb_op:
+ run->mmio.len = 1;
+ *(unsigned char *)data = rd_val;
+ break;
+ default:
+ ret = EMULATE_FAIL;
+ break;
+ }
+ } else if (op8 == 0x38) {
+ /* stxb/h/w/d process */
+ rd = inst.reg3_format.rd;
+ opcode = inst.reg3_format.opcode;
+
+ switch (opcode) {
+ case stxb_op:
+ run->mmio.len = 1;
+ *(unsigned char *)data = vcpu->arch.gprs[rd];
+ break;
+ case stxh_op:
+ run->mmio.len = 2;
+ *(unsigned short *)data = vcpu->arch.gprs[rd];
+ break;
+ case stxw_op:
+ run->mmio.len = 4;
+ *(unsigned int *)data = vcpu->arch.gprs[rd];
+ break;
+ case stxd_op:
+ run->mmio.len = 8;
+ *(unsigned long *)data = vcpu->arch.gprs[rd];
+ break;
+ default:
+ ret = EMULATE_FAIL;
+ break;
+ }
+ } else
+ ret = EMULATE_FAIL;
+
+ if (ret == EMULATE_DO_MMIO) {
+ run->mmio.is_write = 1;
+ vcpu->mmio_needed = 1;
+ vcpu->mmio_is_write = 1;
+ } else {
+ vcpu->arch.pc = curr_pc;
+ kvm_err("Write not supporded inst=0x%08x @%lx BadVaddr:%#lx\n",
+ inst.word, vcpu->arch.pc, vcpu->arch.badv);
+ kvm_arch_vcpu_dump_regs(vcpu);
+ /* Rollback PC if emulation was unsuccessful */
+ }
+
+ return ret;
+}
+
+int _kvm_emu_mmio_read(struct kvm_vcpu *vcpu, larch_inst inst)
+{
+ unsigned int op8, opcode, rd;
+ struct kvm_run *run = vcpu->run;
+ int ret;
+
+ run->mmio.phys_addr = vcpu->arch.badv;
+ vcpu->mmio_needed = 2; /* signed */
+ op8 = (inst.word >> 24) & 0xff;
+ ret = EMULATE_DO_MMIO;
+
+ if (op8 < 0x28) {
+ /* ldptr.w/d process */
+ rd = inst.reg2i14_format.rd;
+ opcode = inst.reg2i14_format.opcode;
+
+ switch (opcode) {
+ case ldptrd_op:
+ run->mmio.len = 8;
+ break;
+ case ldptrw_op:
+ run->mmio.len = 4;
+ break;
+ default:
+ break;
+ }
+ } else if (op8 < 0x2f) {
+ /* ld.b/h/w/d, ld.bu/hu/wu process */
+ rd = inst.reg2i12_format.rd;
+ opcode = inst.reg2i12_format.opcode;
+
+ switch (opcode) {
+ case ldd_op:
+ run->mmio.len = 8;
+ break;
+ case ldwu_op:
+ vcpu->mmio_needed = 1; /* unsigned */
+ run->mmio.len = 4;
+ break;
+ case ldw_op:
+ run->mmio.len = 4;
+ break;
+ case ldhu_op:
+ vcpu->mmio_needed = 1; /* unsigned */
+ run->mmio.len = 2;
+ break;
+ case ldh_op:
+ run->mmio.len = 2;
+ break;
+ case ldbu_op:
+ vcpu->mmio_needed = 1; /* unsigned */
+ run->mmio.len = 1;
+ break;
+ case ldb_op:
+ run->mmio.len = 1;
+ break;
+ default:
+ ret = EMULATE_FAIL;
+ break;
+ }
+ } else if (op8 == 0x38) {
+ /* ldxb/h/w/d, ldxb/h/wu, ldgtb/h/w/d, ldleb/h/w/d process */
+ rd = inst.reg3_format.rd;
+ opcode = inst.reg3_format.opcode;
+
+ switch (opcode) {
+ case ldxb_op:
+ run->mmio.len = 1;
+ break;
+ case ldxbu_op:
+ run->mmio.len = 1;
+ vcpu->mmio_needed = 1; /* unsigned */
+ break;
+ case ldxh_op:
+ run->mmio.len = 2;
+ break;
+ case ldxhu_op:
+ run->mmio.len = 2;
+ vcpu->mmio_needed = 1; /* unsigned */
+ break;
+ case ldxw_op:
+ run->mmio.len = 4;
+ break;
+ case ldxwu_op:
+ run->mmio.len = 4;
+ vcpu->mmio_needed = 1; /* unsigned */
+ break;
+ case ldxd_op:
+ run->mmio.len = 8;
+ break;
+ default:
+ ret = EMULATE_FAIL;
+ break;
+ }
+ } else
+ ret = EMULATE_FAIL;
+
+ if (ret == EMULATE_DO_MMIO) {
+ /* Set for _kvm_complete_mmio_read use */
+ vcpu->arch.io_gpr = rd;
+ run->mmio.is_write = 0;
+ vcpu->mmio_is_write = 0;
+ } else {
+ kvm_err("Load not supporded inst=0x%08x @%lx BadVaddr:%#lx\n",
+ inst.word, vcpu->arch.pc, vcpu->arch.badv);
+ kvm_arch_vcpu_dump_regs(vcpu);
+ vcpu->mmio_needed = 0;
+ }
+ return ret;
+}
+
+int _kvm_complete_mmio_read(struct kvm_vcpu *vcpu, struct kvm_run *run)
+{
+ unsigned long *gpr = &vcpu->arch.gprs[vcpu->arch.io_gpr];
+ enum emulation_result er = EMULATE_DONE;
+
+ /* update with new PC */
+ update_pc(&vcpu->arch);
+ switch (run->mmio.len) {
+ case 8:
+ *gpr = *(s64 *)run->mmio.data;
+ break;
+ case 4:
+ if (vcpu->mmio_needed == 2)
+ *gpr = *(int *)run->mmio.data;
+ else
+ *gpr = *(unsigned int *)run->mmio.data;
+ break;
+ case 2:
+ if (vcpu->mmio_needed == 2)
+ *gpr = *(short *) run->mmio.data;
+ else
+ *gpr = *(unsigned short *)run->mmio.data;
+
+ break;
+ case 1:
+ if (vcpu->mmio_needed == 2)
+ *gpr = *(char *) run->mmio.data;
+ else
+ *gpr = *(unsigned char *) run->mmio.data;
+ break;
+ default:
+ kvm_err("Bad MMIO length: %d,addr is 0x%lx",
+ run->mmio.len, vcpu->arch.badv);
+ er = EMULATE_FAIL;
+ break;
+ }
+
+ return er;
+}
+
static int _kvm_trap_handle_gspr(struct kvm_vcpu *vcpu)
{
enum emulation_result er = EMULATE_DONE;
@@ -317,3 +576,52 @@ static int _kvm_handle_gspr(struct kvm_vcpu *vcpu)
}
return ret;
}
+
+static int _kvm_handle_mmu_fault(struct kvm_vcpu *vcpu, bool write)
+{
+ struct kvm_run *run = vcpu->run;
+ unsigned long badv = vcpu->arch.badv;
+ larch_inst inst;
+ enum emulation_result er = EMULATE_DONE;
+ int ret;
+
+ ret = kvm_handle_mm_fault(vcpu, badv, write);
+ if (ret) {
+ /* Treat as MMIO */
+ inst.word = vcpu->arch.badi;
+ if (write) {
+ er = _kvm_emu_mmio_write(vcpu, inst);
+ } else {
+ /* A code fetch fault doesn't count as an MMIO */
+ if (kvm_is_ifetch_fault(&vcpu->arch)) {
+ kvm_err("%s ifetch error addr:%lx\n", __func__, badv);
+ run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
+ return RESUME_HOST;
+ }
+
+ er = _kvm_emu_mmio_read(vcpu, inst);
+ }
+ }
+
+ if (er == EMULATE_DONE) {
+ ret = RESUME_GUEST;
+ } else if (er == EMULATE_DO_MMIO) {
+ run->exit_reason = KVM_EXIT_MMIO;
+ ret = RESUME_HOST;
+ } else {
+ run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
+ ret = RESUME_HOST;
+ }
+
+ return ret;
+}
+
+static int _kvm_handle_write_fault(struct kvm_vcpu *vcpu)
+{
+ return _kvm_handle_mmu_fault(vcpu, true);
+}
+
+static int _kvm_handle_read_fault(struct kvm_vcpu *vcpu)
+{
+ return _kvm_handle_mmu_fault(vcpu, false);
+}
--
2.31.1
^ permalink raw reply related [flat|nested] 36+ messages in thread
* [PATCH v1 20/24] LoongArch: KVM: Implement handle fpu exception
2023-02-14 2:56 [PATCH v1 00/24] Add KVM LoongArch support Tianrui Zhao
` (18 preceding siblings ...)
2023-02-14 2:56 ` [PATCH v1 19/24] LoongArch: KVM: Implement handle mmio exception Tianrui Zhao
@ 2023-02-14 2:56 ` Tianrui Zhao
2023-02-14 2:56 ` [PATCH v1 21/24] LoongArch: KVM: Implement kvm exception vector Tianrui Zhao
` (3 subsequent siblings)
23 siblings, 0 replies; 36+ messages in thread
From: Tianrui Zhao @ 2023-02-14 2:56 UTC (permalink / raw)
To: Paolo Bonzini
Cc: Huacai Chen, WANG Xuerui, Greg Kroah-Hartman, loongarch,
linux-kernel, kvm, Jens Axboe, Mark Brown, Alex Deucher
Implement handle fpu exception, using kvm_own_fpu to enable fpu for
guest.
Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
---
arch/loongarch/kvm/exit.c | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/arch/loongarch/kvm/exit.c b/arch/loongarch/kvm/exit.c
index 30e64ba72..89c90faa1 100644
--- a/arch/loongarch/kvm/exit.c
+++ b/arch/loongarch/kvm/exit.c
@@ -625,3 +625,30 @@ static int _kvm_handle_read_fault(struct kvm_vcpu *vcpu)
{
return _kvm_handle_mmu_fault(vcpu, false);
}
+
+/**
+ * _kvm_handle_fpu_disabled() - Guest used fpu however it is disabled at host
+ * @vcpu: Virtual CPU context.
+ *
+ * Handle when the guest attempts to use fpu which hasn't been allowed
+ * by the root context.
+ */
+static int _kvm_handle_fpu_disabled(struct kvm_vcpu *vcpu)
+{
+ struct kvm_run *run = vcpu->run;
+
+ /*
+ * If guest FPU not present, the FPU operation should have been
+ * treated as a reserved instruction!
+ * If FPU already in use, we shouldn't get this at all.
+ */
+ if (WARN_ON(!_kvm_guest_has_fpu(&vcpu->arch) ||
+ vcpu->arch.aux_inuse & KVM_LARCH_FPU)) {
+ kvm_err("%s internal error\n", __func__);
+ run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
+ return RESUME_HOST;
+ }
+
+ kvm_own_fpu(vcpu);
+ return RESUME_GUEST;
+}
--
2.31.1
^ permalink raw reply related [flat|nested] 36+ messages in thread
* [PATCH v1 21/24] LoongArch: KVM: Implement kvm exception vector
2023-02-14 2:56 [PATCH v1 00/24] Add KVM LoongArch support Tianrui Zhao
` (19 preceding siblings ...)
2023-02-14 2:56 ` [PATCH v1 20/24] LoongArch: KVM: Implement handle fpu exception Tianrui Zhao
@ 2023-02-14 2:56 ` Tianrui Zhao
2023-02-14 2:56 ` [PATCH v1 22/24] LoongArch: KVM: Implement vcpu world switch Tianrui Zhao
` (2 subsequent siblings)
23 siblings, 0 replies; 36+ messages in thread
From: Tianrui Zhao @ 2023-02-14 2:56 UTC (permalink / raw)
To: Paolo Bonzini
Cc: Huacai Chen, WANG Xuerui, Greg Kroah-Hartman, loongarch,
linux-kernel, kvm, Jens Axboe, Mark Brown, Alex Deucher
Implement kvm exception vector, using _kvm_fault_tables array to save
the handle function pointer and it is used when vcpu handle exit.
Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
---
arch/loongarch/kvm/exit.c | 48 +++++++++++++++++++++++++++++++++++++++
1 file changed, 48 insertions(+)
diff --git a/arch/loongarch/kvm/exit.c b/arch/loongarch/kvm/exit.c
index 89c90faa1..6fd3219bb 100644
--- a/arch/loongarch/kvm/exit.c
+++ b/arch/loongarch/kvm/exit.c
@@ -652,3 +652,51 @@ static int _kvm_handle_fpu_disabled(struct kvm_vcpu *vcpu)
kvm_own_fpu(vcpu);
return RESUME_GUEST;
}
+
+/*
+ * Loongarch KVM callback handling for not implemented guest exiting
+ */
+static int _kvm_fault_ni(struct kvm_vcpu *vcpu)
+{
+ unsigned long estat, badv;
+ unsigned int exccode, inst;
+
+ /*
+ * Fetch the instruction.
+ */
+ badv = vcpu->arch.badv;
+ estat = vcpu->arch.host_estat;
+ exccode = (estat & CSR_ESTAT_EXC) >> CSR_ESTAT_EXC_SHIFT;
+ inst = vcpu->arch.badi;
+ kvm_err("Exccode: %d PC=%#lx inst=0x%08x BadVaddr=%#lx estat=%#llx\n",
+ exccode, vcpu->arch.pc, inst, badv, read_gcsr_estat());
+ kvm_arch_vcpu_dump_regs(vcpu);
+ vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
+
+ return RESUME_HOST;
+}
+
+static exit_handle_fn _kvm_fault_tables[EXCCODE_INT_START] = {
+ [EXCCODE_TLBL] = _kvm_handle_read_fault,
+ [EXCCODE_TLBI] = _kvm_handle_read_fault,
+ [EXCCODE_TLBNR] = _kvm_handle_read_fault,
+ [EXCCODE_TLBNX] = _kvm_handle_read_fault,
+ [EXCCODE_TLBS] = _kvm_handle_write_fault,
+ [EXCCODE_TLBM] = _kvm_handle_write_fault,
+ [EXCCODE_FPDIS] = _kvm_handle_fpu_disabled,
+ [EXCCODE_GSPR] = _kvm_handle_gspr,
+};
+
+int _kvm_handle_fault(struct kvm_vcpu *vcpu, int fault)
+{
+ return _kvm_fault_tables[fault](vcpu);
+}
+
+void _kvm_init_fault(void)
+{
+ int i;
+
+ for (i = 0; i < EXCCODE_INT_START; i++)
+ if (!_kvm_fault_tables[i])
+ _kvm_fault_tables[i] = _kvm_fault_ni;
+}
--
2.31.1
^ permalink raw reply related [flat|nested] 36+ messages in thread
* [PATCH v1 22/24] LoongArch: KVM: Implement vcpu world switch
2023-02-14 2:56 [PATCH v1 00/24] Add KVM LoongArch support Tianrui Zhao
` (20 preceding siblings ...)
2023-02-14 2:56 ` [PATCH v1 21/24] LoongArch: KVM: Implement kvm exception vector Tianrui Zhao
@ 2023-02-14 2:56 ` Tianrui Zhao
2023-02-14 7:07 ` kernel test robot
2023-02-14 2:56 ` [PATCH v1 23/24] LoongArch: KVM: Implement probe virtualization when loongarch cpu init Tianrui Zhao
2023-02-14 2:56 ` [PATCH v1 24/24] LoongArch: KVM: Enable kvm config and add the makefile Tianrui Zhao
23 siblings, 1 reply; 36+ messages in thread
From: Tianrui Zhao @ 2023-02-14 2:56 UTC (permalink / raw)
To: Paolo Bonzini
Cc: Huacai Chen, WANG Xuerui, Greg Kroah-Hartman, loongarch,
linux-kernel, kvm, Jens Axboe, Mark Brown, Alex Deucher
Implement loongarch vcpu world switch, including vcpu enter guest and
vcpu exit from guest, both operations need to save or restore the host
and guest registers.
Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
---
arch/loongarch/kernel/asm-offsets.c | 32 +++
arch/loongarch/kvm/switch.S | 327 ++++++++++++++++++++++++++++
2 files changed, 359 insertions(+)
create mode 100644 arch/loongarch/kvm/switch.S
diff --git a/arch/loongarch/kernel/asm-offsets.c b/arch/loongarch/kernel/asm-offsets.c
index 4bdb203fc..655741c03 100644
--- a/arch/loongarch/kernel/asm-offsets.c
+++ b/arch/loongarch/kernel/asm-offsets.c
@@ -9,6 +9,7 @@
#include <linux/mm.h>
#include <linux/kbuild.h>
#include <linux/suspend.h>
+#include <linux/kvm_host.h>
#include <asm/cpu-info.h>
#include <asm/ptrace.h>
#include <asm/processor.h>
@@ -272,3 +273,34 @@ void output_pbe_defines(void)
BLANK();
}
#endif
+
+void output_kvm_defines(void)
+{
+ COMMENT(" KVM/LOONGARCH Specific offsets. ");
+
+ OFFSET(VCPU_FCSR0, kvm_vcpu_arch, fpu.fcsr);
+ OFFSET(VCPU_FCC, kvm_vcpu_arch, fpu.fcc);
+ BLANK();
+
+ OFFSET(KVM_VCPU_ARCH, kvm_vcpu, arch);
+ OFFSET(KVM_VCPU_KVM, kvm_vcpu, kvm);
+ OFFSET(KVM_VCPU_RUN, kvm_vcpu, run);
+ BLANK();
+
+ OFFSET(KVM_ARCH_HSTACK, kvm_vcpu_arch, host_stack);
+ OFFSET(KVM_ARCH_HGP, kvm_vcpu_arch, host_gp);
+ OFFSET(KVM_ARCH_HANDLE_EXIT, kvm_vcpu_arch, handle_exit);
+ OFFSET(KVM_ARCH_HPGD, kvm_vcpu_arch, host_pgd);
+ OFFSET(KVM_ARCH_GEENTRY, kvm_vcpu_arch, guest_eentry);
+ OFFSET(KVM_ARCH_GPC, kvm_vcpu_arch, pc);
+ OFFSET(KVM_ARCH_GGPR, kvm_vcpu_arch, gprs);
+ OFFSET(KVM_ARCH_HESTAT, kvm_vcpu_arch, host_estat);
+ OFFSET(KVM_ARCH_HBADV, kvm_vcpu_arch, badv);
+ OFFSET(KVM_ARCH_HBADI, kvm_vcpu_arch, badi);
+ OFFSET(KVM_ARCH_HECFG, kvm_vcpu_arch, host_ecfg);
+ OFFSET(KVM_ARCH_HEENTRY, kvm_vcpu_arch, host_eentry);
+ OFFSET(KVM_ARCH_HPERCPU, kvm_vcpu_arch, host_percpu);
+
+ OFFSET(KVM_GPGD, kvm, arch.gpa_mm.pgd);
+ BLANK();
+}
diff --git a/arch/loongarch/kvm/switch.S b/arch/loongarch/kvm/switch.S
new file mode 100644
index 000000000..c0b8062ac
--- /dev/null
+++ b/arch/loongarch/kvm/switch.S
@@ -0,0 +1,327 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020-2023 Loongson Technology Corporation Limited
+ */
+
+#include <linux/linkage.h>
+#include <asm/stackframe.h>
+#include <asm/asm.h>
+#include <asm/asmmacro.h>
+#include <asm/regdef.h>
+#include <asm/loongarch.h>
+#include <asm/export.h>
+
+#define RESUME_HOST (1 << 1)
+
+#define PT_GPR_OFFSET(x) (PT_R0 + 8*x)
+#define CONFIG_GUEST_CRMD ((1 << CSR_CRMD_DACM_SHIFT) | \
+ (1 << CSR_CRMD_DACF_SHIFT) | \
+ CSR_CRMD_PG | PLV_KERN)
+ .text
+
+.macro kvm_save_host_gpr base
+ .irp n,1,2,3,22,23,24,25,26,27,28,29,30,31
+ st.d $r\n, \base, PT_GPR_OFFSET(\n)
+ .endr
+.endm
+
+.macro kvm_restore_host_gpr base
+ .irp n,1,2,3,22,23,24,25,26,27,28,29,30,31
+ ld.d $r\n, \base, PT_GPR_OFFSET(\n)
+ .endr
+.endm
+
+/*
+ * prepare switch to guest
+ * @param:
+ * KVM_ARCH: kvm_vcpu_arch, don't touch it until 'ertn'
+ * GPRNUM: KVM_ARCH gpr number
+ * tmp, tmp1: temp register
+ */
+.macro kvm_switch_to_guest KVM_ARCH GPRNUM tmp tmp1
+ /* set host excfg.VS=0, all exceptions share one exception entry */
+ csrrd \tmp, LOONGARCH_CSR_ECFG
+ bstrins.w \tmp, zero, CSR_ECFG_VS_SHIFT_END, CSR_ECFG_VS_SHIFT
+ csrwr \tmp, LOONGARCH_CSR_ECFG
+
+ /* Load up the new EENTRY */
+ ld.d \tmp, \KVM_ARCH, KVM_ARCH_GEENTRY
+ csrwr \tmp, LOONGARCH_CSR_EENTRY
+
+ /* Set Guest ERA */
+ ld.d \tmp, \KVM_ARCH, KVM_ARCH_GPC
+ csrwr \tmp, LOONGARCH_CSR_ERA
+
+ /* Save host PGDL */
+ csrrd \tmp, LOONGARCH_CSR_PGDL
+ st.d \tmp, \KVM_ARCH, KVM_ARCH_HPGD
+
+ /* Switch to kvm */
+ ld.d \tmp1, \KVM_ARCH, KVM_VCPU_KVM - KVM_VCPU_ARCH
+
+ /* Load guest PGDL */
+ lu12i.w \tmp, KVM_GPGD
+ srli.w \tmp, \tmp, 12
+ ldx.d \tmp, \tmp1, \tmp
+ csrwr \tmp, LOONGARCH_CSR_PGDL
+
+ /* Mix GID and RID */
+ csrrd \tmp1, LOONGARCH_CSR_GSTAT
+ bstrpick.w \tmp1, \tmp1, CSR_GSTAT_GID_SHIFT_END, CSR_GSTAT_GID_SHIFT
+ csrrd \tmp, LOONGARCH_CSR_GTLBC
+ bstrins.w \tmp, \tmp1, CSR_GTLBC_TGID_SHIFT_END, CSR_GTLBC_TGID_SHIFT
+ csrwr \tmp, LOONGARCH_CSR_GTLBC
+
+ /*
+ * Switch to guest:
+ * GSTAT.PGM = 1, ERRCTL.ISERR = 0, TLBRPRMD.ISTLBR = 0
+ * ertn
+ */
+
+ /* Prepare enable Intr before enter guest */
+ ori \tmp, zero, CSR_PRMD_PIE
+ csrxchg \tmp, \tmp, LOONGARCH_CSR_PRMD
+
+ /* Set PVM bit to setup ertn to guest context */
+ ori \tmp, zero, CSR_GSTAT_PVM
+ csrxchg \tmp, \tmp, LOONGARCH_CSR_GSTAT
+
+ /* Load Guest gprs */
+ ld.d $r1, \KVM_ARCH, (KVM_ARCH_GGPR + 8 * 1)
+ ld.d $r2, \KVM_ARCH, (KVM_ARCH_GGPR + 8 * 2)
+ ld.d $r3, \KVM_ARCH, (KVM_ARCH_GGPR + 8 * 3)
+ ld.d $r4, \KVM_ARCH, (KVM_ARCH_GGPR + 8 * 4)
+ ld.d $r5, \KVM_ARCH, (KVM_ARCH_GGPR + 8 * 5)
+ ld.d $r7, \KVM_ARCH, (KVM_ARCH_GGPR + 8 * 7)
+ ld.d $r8, \KVM_ARCH, (KVM_ARCH_GGPR + 8 * 8)
+ ld.d $r9, \KVM_ARCH, (KVM_ARCH_GGPR + 8 * 9)
+ ld.d $r10, \KVM_ARCH, (KVM_ARCH_GGPR + 8 * 10)
+ ld.d $r11, \KVM_ARCH, (KVM_ARCH_GGPR + 8 * 11)
+ ld.d $r12, \KVM_ARCH, (KVM_ARCH_GGPR + 8 * 12)
+ ld.d $r13, \KVM_ARCH, (KVM_ARCH_GGPR + 8 * 13)
+ ld.d $r14, \KVM_ARCH, (KVM_ARCH_GGPR + 8 * 14)
+ ld.d $r15, \KVM_ARCH, (KVM_ARCH_GGPR + 8 * 15)
+ ld.d $r16, \KVM_ARCH, (KVM_ARCH_GGPR + 8 * 16)
+ ld.d $r17, \KVM_ARCH, (KVM_ARCH_GGPR + 8 * 17)
+ ld.d $r18, \KVM_ARCH, (KVM_ARCH_GGPR + 8 * 18)
+ ld.d $r19, \KVM_ARCH, (KVM_ARCH_GGPR + 8 * 19)
+ ld.d $r20, \KVM_ARCH, (KVM_ARCH_GGPR + 8 * 20)
+ ld.d $r21, \KVM_ARCH, (KVM_ARCH_GGPR + 8 * 21)
+ ld.d $r22, \KVM_ARCH, (KVM_ARCH_GGPR + 8 * 22)
+ ld.d $r23, \KVM_ARCH, (KVM_ARCH_GGPR + 8 * 23)
+ ld.d $r24, \KVM_ARCH, (KVM_ARCH_GGPR + 8 * 24)
+ ld.d $r25, \KVM_ARCH, (KVM_ARCH_GGPR + 8 * 25)
+ ld.d $r26, \KVM_ARCH, (KVM_ARCH_GGPR + 8 * 26)
+ ld.d $r27, \KVM_ARCH, (KVM_ARCH_GGPR + 8 * 27)
+ ld.d $r28, \KVM_ARCH, (KVM_ARCH_GGPR + 8 * 28)
+ ld.d $r29, \KVM_ARCH, (KVM_ARCH_GGPR + 8 * 29)
+ ld.d $r30, \KVM_ARCH, (KVM_ARCH_GGPR + 8 * 30)
+ ld.d $r31, \KVM_ARCH, (KVM_ARCH_GGPR + 8 * 31)
+ /* Load KVM_ARCH register */
+ ld.d \KVM_ARCH, \KVM_ARCH, (KVM_ARCH_GGPR + 8 * \GPRNUM)
+
+ ertn
+.endm
+
+/* load kvm_vcpu to a2 and store a1 for free use */
+ .section .text
+ .cfi_sections .debug_frame
+SYM_CODE_START(kvm_vector_entry)
+ csrwr a2, KVM_TEMP_KS
+ csrrd a2, KVM_VCPU_KS
+ addi.d a2, a2, KVM_VCPU_ARCH
+
+ /* After save gprs, free to use any gpr */
+ st.d $r1, a2, (KVM_ARCH_GGPR + 8 * 1)
+ st.d $r2, a2, (KVM_ARCH_GGPR + 8 * 2)
+ st.d $r3, a2, (KVM_ARCH_GGPR + 8 * 3)
+ st.d $r4, a2, (KVM_ARCH_GGPR + 8 * 4)
+ st.d $r5, a2, (KVM_ARCH_GGPR + 8 * 5)
+ st.d $r7, a2, (KVM_ARCH_GGPR + 8 * 7)
+ st.d $r8, a2, (KVM_ARCH_GGPR + 8 * 8)
+ st.d $r9, a2, (KVM_ARCH_GGPR + 8 * 9)
+ st.d $r10, a2, (KVM_ARCH_GGPR + 8 * 10)
+ st.d $r11, a2, (KVM_ARCH_GGPR + 8 * 11)
+ st.d $r12, a2, (KVM_ARCH_GGPR + 8 * 12)
+ st.d $r13, a2, (KVM_ARCH_GGPR + 8 * 13)
+ st.d $r14, a2, (KVM_ARCH_GGPR + 8 * 14)
+ st.d $r15, a2, (KVM_ARCH_GGPR + 8 * 15)
+ st.d $r16, a2, (KVM_ARCH_GGPR + 8 * 16)
+ st.d $r17, a2, (KVM_ARCH_GGPR + 8 * 17)
+ st.d $r18, a2, (KVM_ARCH_GGPR + 8 * 18)
+ st.d $r19, a2, (KVM_ARCH_GGPR + 8 * 19)
+ st.d $r20, a2, (KVM_ARCH_GGPR + 8 * 20)
+ st.d $r21, a2, (KVM_ARCH_GGPR + 8 * 21)
+ st.d $r22, a2, (KVM_ARCH_GGPR + 8 * 22)
+ st.d $r23, a2, (KVM_ARCH_GGPR + 8 * 23)
+ st.d $r24, a2, (KVM_ARCH_GGPR + 8 * 24)
+ st.d $r25, a2, (KVM_ARCH_GGPR + 8 * 25)
+ st.d $r26, a2, (KVM_ARCH_GGPR + 8 * 26)
+ st.d $r27, a2, (KVM_ARCH_GGPR + 8 * 27)
+ st.d $r28, a2, (KVM_ARCH_GGPR + 8 * 28)
+ st.d $r29, a2, (KVM_ARCH_GGPR + 8 * 29)
+ st.d $r30, a2, (KVM_ARCH_GGPR + 8 * 30)
+ st.d $r31, a2, (KVM_ARCH_GGPR + 8 * 31)
+ /* Save guest a2 */
+ csrrd t0, KVM_TEMP_KS
+ st.d t0, a2, (KVM_ARCH_GGPR + 8 * REG_A2)
+
+ /* a2: kvm_vcpu_arch, a1 is free to use */
+ csrrd s1, KVM_VCPU_KS
+ ld.d s0, s1, KVM_VCPU_RUN
+
+ csrrd t0, LOONGARCH_CSR_ESTAT
+ st.d t0, a2, KVM_ARCH_HESTAT
+ csrrd t0, LOONGARCH_CSR_ERA
+ st.d t0, a2, KVM_ARCH_GPC
+ csrrd t0, LOONGARCH_CSR_BADV
+ st.d t0, a2, KVM_ARCH_HBADV
+ csrrd t0, LOONGARCH_CSR_BADI
+ st.d t0, a2, KVM_ARCH_HBADI
+
+ /* Restore host excfg.VS */
+ csrrd t0, LOONGARCH_CSR_ECFG
+ ld.d t1, a2, KVM_ARCH_HECFG
+ or t0, t0, t1
+ csrwr t0, LOONGARCH_CSR_ECFG
+
+ /* Restore host eentry */
+ ld.d t0, a2, KVM_ARCH_HEENTRY
+ csrwr t0, LOONGARCH_CSR_EENTRY
+
+#if defined(CONFIG_CPU_HAS_FPU)
+ /* Save FPU context */
+ csrrd t0, LOONGARCH_CSR_EUEN
+ ori t1, zero, CSR_EUEN_FPEN
+ and t2, t0, t1
+ beqz t2, 1f
+ movfcsr2gr t3, fcsr0
+ st.d t3, a2, VCPU_FCSR0
+
+ movcf2gr t3, $fcc0
+ or t2, t3, zero
+ movcf2gr t3, $fcc1
+ bstrins.d t2, t3, 0xf, 0x8
+ movcf2gr t3, $fcc2
+ bstrins.d t2, t3, 0x17, 0x10
+ movcf2gr t3, $fcc3
+ bstrins.d t2, t3, 0x1f, 0x18
+ movcf2gr t3, $fcc4
+ bstrins.d t2, t3, 0x27, 0x20
+ movcf2gr t3, $fcc5
+ bstrins.d t2, t3, 0x2f, 0x28
+ movcf2gr t3, $fcc6
+ bstrins.d t2, t3, 0x37, 0x30
+ movcf2gr t3, $fcc7
+ bstrins.d t2, t3, 0x3f, 0x38
+ st.d t2, a2, VCPU_FCC
+ movgr2fcsr fcsr0, zero
+1:
+#endif
+ ld.d t0, a2, KVM_ARCH_HPGD
+ csrwr t0, LOONGARCH_CSR_PGDL
+
+ /* Disable PVM bit for keeping from into guest */
+ ori t0, zero, CSR_GSTAT_PVM
+ csrxchg zero, t0, LOONGARCH_CSR_GSTAT
+ /* Clear GTLBC.TGID field */
+ csrrd t0, LOONGARCH_CSR_GTLBC
+ bstrins.w t0, zero, CSR_GTLBC_TGID_SHIFT_END, CSR_GTLBC_TGID_SHIFT
+ csrwr t0, LOONGARCH_CSR_GTLBC
+ /* Enable Address Map mode */
+ ori t0, zero, CONFIG_GUEST_CRMD
+ csrwr t0, LOONGARCH_CSR_CRMD
+ ld.d tp, a2, KVM_ARCH_HGP
+ ld.d sp, a2, KVM_ARCH_HSTACK
+ /* restore per cpu register */
+ ld.d $r21, a2, KVM_ARCH_HPERCPU
+ addi.d sp, sp, -PT_SIZE
+
+ /* Prepare handle exception */
+ or a0, s0, zero
+ or a1, s1, zero
+ ld.d t8, a2, KVM_ARCH_HANDLE_EXIT
+ jirl ra,t8, 0
+
+ ori t0, zero, CSR_CRMD_IE
+ csrxchg zero, t0, LOONGARCH_CSR_CRMD
+ or a2, s1, zero
+ addi.d a2, a2, KVM_VCPU_ARCH
+
+ andi t0, a0, RESUME_HOST
+ bnez t0, ret_to_host
+
+ /*
+ * return to guest
+ * save per cpu register again, maybe switched to another cpu
+ */
+ st.d $r21, a2, KVM_ARCH_HPERCPU
+
+ /* Save kvm_vcpu to kscratch */
+ csrwr s1, KVM_VCPU_KS
+ kvm_switch_to_guest a2 REG_A2 t0 t1
+
+ret_to_host:
+ ld.d a2, a2, KVM_ARCH_HSTACK
+ addi.d a2, a2, -PT_SIZE
+ srai.w a3, a0, 2
+ or a0, a3, zero
+ kvm_restore_host_gpr a2
+ jirl zero, ra, 0
+SYM_CODE_END(kvm_vector_entry)
+kvm_vector_entry_end:
+
+/*
+ * int kvm_enter_guest(struct kvm_run *run, struct kvm_vcpu *vcpu)
+ *
+ * @register_param:
+ * a0: kvm_run* run
+ * a1: kvm_vcpu* vcpu
+ */
+SYM_FUNC_START(kvm_enter_guest)
+ /* allocate space in stack bottom */
+ addi.d a2, sp, -PT_SIZE
+ /* save host gprs */
+ kvm_save_host_gpr a2
+
+ /* save host crmd,prmd csr to stack */
+ csrrd a3, LOONGARCH_CSR_CRMD
+ st.d a3, a2, PT_CRMD
+ csrrd a3, LOONGARCH_CSR_PRMD
+ st.d a3, a2, PT_PRMD
+
+ addi.d a2, a1, KVM_VCPU_ARCH
+ st.d sp, a2, KVM_ARCH_HSTACK
+ st.d tp, a2, KVM_ARCH_HGP
+ /* Save per cpu register */
+ st.d $r21, a2, KVM_ARCH_HPERCPU
+
+ /* Save kvm_vcpu to kscratch */
+ csrwr a1, KVM_VCPU_KS
+ kvm_switch_to_guest a2 REG_A2 t0 t1
+SYM_FUNC_END(kvm_enter_guest)
+kvm_enter_guest_end:
+
+ .section ".rodata"
+SYM_DATA(kvm_vector_size,
+ .quad kvm_vector_entry_end - kvm_vector_entry)
+SYM_DATA(kvm_enter_guest_size,
+ .quad kvm_enter_guest_end - kvm_enter_guest)
+
+
+SYM_FUNC_START(kvm_save_fpu)
+ fpu_save_double a0 t1
+ jirl zero, ra, 0
+SYM_FUNC_END(kvm_save_fpu)
+
+SYM_FUNC_START(kvm_restore_fpu)
+ fpu_restore_double a0 t1
+ jirl zero, ra, 0
+SYM_FUNC_END(kvm_restore_fpu)
+
+SYM_FUNC_START(kvm_restore_fcsr)
+ fpu_restore_csr a0 t1
+ fpu_restore_cc a0 t1 t2
+
+ jirl zero, ra, 0
+SYM_FUNC_END(kvm_restore_fcsr)
--
2.31.1
^ permalink raw reply related [flat|nested] 36+ messages in thread
* [PATCH v1 23/24] LoongArch: KVM: Implement probe virtualization when loongarch cpu init
2023-02-14 2:56 [PATCH v1 00/24] Add KVM LoongArch support Tianrui Zhao
` (21 preceding siblings ...)
2023-02-14 2:56 ` [PATCH v1 22/24] LoongArch: KVM: Implement vcpu world switch Tianrui Zhao
@ 2023-02-14 2:56 ` Tianrui Zhao
2023-02-14 2:56 ` [PATCH v1 24/24] LoongArch: KVM: Enable kvm config and add the makefile Tianrui Zhao
23 siblings, 0 replies; 36+ messages in thread
From: Tianrui Zhao @ 2023-02-14 2:56 UTC (permalink / raw)
To: Paolo Bonzini
Cc: Huacai Chen, WANG Xuerui, Greg Kroah-Hartman, loongarch,
linux-kernel, kvm, Jens Axboe, Mark Brown, Alex Deucher
Implement probe virtualization when loongarch cpu init, including guest
gid info, guest fpu info, etc.
Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
---
arch/loongarch/kernel/cpu-probe.c | 53 +++++++++++++++++++++++++++++++
1 file changed, 53 insertions(+)
diff --git a/arch/loongarch/kernel/cpu-probe.c b/arch/loongarch/kernel/cpu-probe.c
index 3a3fce2d7..9c3483d9a 100644
--- a/arch/loongarch/kernel/cpu-probe.c
+++ b/arch/loongarch/kernel/cpu-probe.c
@@ -176,6 +176,57 @@ static void cpu_probe_common(struct cpuinfo_loongarch *c)
}
}
+static inline void cpu_probe_guestinfo(struct cpuinfo_loongarch *c)
+{
+ unsigned long guestinfo;
+
+ guestinfo = read_csr_gstat();
+ if (guestinfo & CSR_GSTAT_GIDBIT) {
+ c->options |= LOONGARCH_CPU_GUESTID;
+ write_csr_gstat(0);
+ }
+}
+
+static inline void cpu_probe_lvz(struct cpuinfo_loongarch *c)
+{
+ unsigned long gcfg, gprcfg1;
+
+ cpu_probe_guestinfo(c);
+
+ c->guest.options |= LOONGARCH_CPU_FPU;
+ c->guest.options_dyn |= LOONGARCH_CPU_FPU;
+ c->guest.options_dyn |= LOONGARCH_CPU_PMP;
+
+ c->guest.ases |= LOONGARCH_CPU_LSX;
+ c->guest.ases_dyn |= LOONGARCH_CPU_LSX;
+ gprcfg1 = read_gcsr_prcfg1();
+ c->guest.kscratch_mask = GENMASK((gprcfg1 & CSR_CONF1_KSNUM) - 1, 0);
+
+ gcfg = read_csr_gcfg();
+ if (gcfg & CSR_GCFG_MATP_GUEST)
+ c->guest_cfg |= BIT(0);
+ if (gcfg & CSR_GCFG_MATP_ROOT)
+ c->guest_cfg |= BIT(1);
+ if (gcfg & CSR_GCFG_MATP_NEST)
+ c->guest_cfg |= BIT(2);
+ if (gcfg & CSR_GCFG_SITP)
+ c->guest_cfg |= BIT(6);
+ if (gcfg & CSR_GCFG_TITP)
+ c->guest_cfg |= BIT(8);
+ if (gcfg & CSR_GCFG_TOEP)
+ c->guest_cfg |= BIT(10);
+ if (gcfg & CSR_GCFG_TOPP)
+ c->guest_cfg |= BIT(12);
+ if (gcfg & CSR_GCFG_TORUP)
+ c->guest_cfg |= BIT(14);
+ if (gcfg & CSR_GCFG_GCIP_ALL)
+ c->guest_cfg |= BIT(16);
+ if (gcfg & CSR_GCFG_GCIP_HIT)
+ c->guest_cfg |= BIT(17);
+ if (gcfg & CSR_GCFG_GCIP_SECURE)
+ c->guest_cfg |= BIT(18);
+}
+
#define MAX_NAME_LEN 32
#define VENDOR_OFFSET 0
#define CPUNAME_OFFSET 9
@@ -289,6 +340,8 @@ void cpu_probe(void)
if (cpu == 0)
__ua_limit = ~((1ull << cpu_vabits) - 1);
#endif
+ if (cpu_has_lvz)
+ cpu_probe_lvz(c);
cpu_report();
}
--
2.31.1
^ permalink raw reply related [flat|nested] 36+ messages in thread
* [PATCH v1 24/24] LoongArch: KVM: Enable kvm config and add the makefile
2023-02-14 2:56 [PATCH v1 00/24] Add KVM LoongArch support Tianrui Zhao
` (22 preceding siblings ...)
2023-02-14 2:56 ` [PATCH v1 23/24] LoongArch: KVM: Implement probe virtualization when loongarch cpu init Tianrui Zhao
@ 2023-02-14 2:56 ` Tianrui Zhao
23 siblings, 0 replies; 36+ messages in thread
From: Tianrui Zhao @ 2023-02-14 2:56 UTC (permalink / raw)
To: Paolo Bonzini
Cc: Huacai Chen, WANG Xuerui, Greg Kroah-Hartman, loongarch,
linux-kernel, kvm, Jens Axboe, Mark Brown, Alex Deucher
Enable loongarch kvm config and add the makefile to support build kvm
module.
Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
---
arch/loongarch/Kbuild | 1 +
arch/loongarch/Kconfig | 2 ++
arch/loongarch/configs/loongson3_defconfig | 2 ++
arch/loongarch/kvm/Kconfig | 38 ++++++++++++++++++++++
arch/loongarch/kvm/Makefile | 21 ++++++++++++
5 files changed, 64 insertions(+)
create mode 100644 arch/loongarch/kvm/Kconfig
create mode 100644 arch/loongarch/kvm/Makefile
diff --git a/arch/loongarch/Kbuild b/arch/loongarch/Kbuild
index b01f5cdb2..40be8a169 100644
--- a/arch/loongarch/Kbuild
+++ b/arch/loongarch/Kbuild
@@ -2,6 +2,7 @@ obj-y += kernel/
obj-y += mm/
obj-y += net/
obj-y += vdso/
+obj-y += kvm/
# for cleaning
subdir- += boot
diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig
index 9cc8b84f7..424ad9392 100644
--- a/arch/loongarch/Kconfig
+++ b/arch/loongarch/Kconfig
@@ -142,6 +142,7 @@ config LOONGARCH
select USE_PERCPU_NUMA_NODE_ID
select USER_STACKTRACE_SUPPORT
select ZONE_DMA32
+ select HAVE_KVM
config 32BIT
bool
@@ -541,3 +542,4 @@ source "drivers/acpi/Kconfig"
endmenu
source "drivers/firmware/Kconfig"
+source "arch/loongarch/kvm/Kconfig"
diff --git a/arch/loongarch/configs/loongson3_defconfig b/arch/loongarch/configs/loongson3_defconfig
index eb84cae64..9a6e31b43 100644
--- a/arch/loongarch/configs/loongson3_defconfig
+++ b/arch/loongarch/configs/loongson3_defconfig
@@ -62,6 +62,8 @@ CONFIG_EFI_ZBOOT=y
CONFIG_EFI_GENERIC_STUB_INITRD_CMDLINE_LOADER=y
CONFIG_EFI_CAPSULE_LOADER=m
CONFIG_EFI_TEST=m
+CONFIG_VIRTUALIZATION=y
+CONFIG_KVM=m
CONFIG_MODULES=y
CONFIG_MODULE_FORCE_LOAD=y
CONFIG_MODULE_UNLOAD=y
diff --git a/arch/loongarch/kvm/Kconfig b/arch/loongarch/kvm/Kconfig
new file mode 100644
index 000000000..8a999b4c0
--- /dev/null
+++ b/arch/loongarch/kvm/Kconfig
@@ -0,0 +1,38 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# KVM configuration
+#
+
+source "virt/kvm/Kconfig"
+
+menuconfig VIRTUALIZATION
+ bool "Virtualization"
+ help
+ Say Y here to get to see options for using your Linux host to run
+ other operating systems inside virtual machines (guests).
+ This option alone does not add any kernel code.
+
+ If you say N, all options in this submenu will be skipped and
+ disabled.
+
+if VIRTUALIZATION
+
+config KVM
+ tristate "Kernel-based Virtual Machine (KVM) support"
+ depends on HAVE_KVM
+ select MMU_NOTIFIER
+ select ANON_INODES
+ select PREEMPT_NOTIFIERS
+ select KVM_MMIO
+ select KVM_GENERIC_DIRTYLOG_READ_PROTECT
+ select HAVE_KVM_VCPU_ASYNC_IOCTL
+ select HAVE_KVM_EVENTFD
+ select SRCU
+ help
+ Support hosting virtualized guest machines using hardware
+ virtualization extensions. You will need a fairly processor
+ equipped with virtualization extensions.
+
+ If unsure, say N.
+
+endif # VIRTUALIZATION
diff --git a/arch/loongarch/kvm/Makefile b/arch/loongarch/kvm/Makefile
new file mode 100644
index 000000000..42e9dcc18
--- /dev/null
+++ b/arch/loongarch/kvm/Makefile
@@ -0,0 +1,21 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for LOONGARCH KVM support
+#
+
+ccflags-y += -I $(srctree)/$(src)
+
+include $(srctree)/virt/kvm/Makefile.kvm
+
+obj-$(CONFIG_KVM) += kvm.o
+
+kvm-y += main.o
+kvm-y += vm.o
+kvm-y += vmid.o
+kvm-y += tlb.o
+kvm-y += mmu.o
+kvm-y += vcpu.o
+kvm-y += exit.o
+kvm-y += interrupt.o
+kvm-y += timer.o
+kvm-y += switch.o
--
2.31.1
^ permalink raw reply related [flat|nested] 36+ messages in thread
* Re: [PATCH v1 01/24] LoongArch: KVM: Implement kvm module related interface
2023-02-14 2:56 ` [PATCH v1 01/24] LoongArch: KVM: Implement kvm module related interface Tianrui Zhao
@ 2023-02-14 6:38 ` Greg Kroah-Hartman
2023-02-14 9:00 ` Tianrui Zhao
0 siblings, 1 reply; 36+ messages in thread
From: Greg Kroah-Hartman @ 2023-02-14 6:38 UTC (permalink / raw)
To: Tianrui Zhao
Cc: Paolo Bonzini, Huacai Chen, WANG Xuerui, loongarch, linux-kernel,
kvm, Jens Axboe, Mark Brown, Alex Deucher
On Tue, Feb 14, 2023 at 10:56:25AM +0800, Tianrui Zhao wrote:
> 1. Implement loongarch kvm module init, module exit interface,
> using kvm context to save the vpid info and vcpu world switch
> interface pointer.
> 2. Implement kvm hardware enable, disable interface, setting
> the guest config reg to enable virtualization features.
> 3. Add kvm related headers.
Shouldn't this be 3 different patches instead?
>
> Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
> ---
> arch/loongarch/include/asm/cpu-features.h | 22 ++
> arch/loongarch/include/asm/kvm_host.h | 257 ++++++++++++++++++++++
> arch/loongarch/include/asm/kvm_types.h | 11 +
> arch/loongarch/include/uapi/asm/kvm.h | 121 ++++++++++
> arch/loongarch/kvm/main.c | 152 +++++++++++++
> include/uapi/linux/kvm.h | 15 ++
> 6 files changed, 578 insertions(+)
> create mode 100644 arch/loongarch/include/asm/kvm_host.h
> create mode 100644 arch/loongarch/include/asm/kvm_types.h
> create mode 100644 arch/loongarch/include/uapi/asm/kvm.h
> create mode 100644 arch/loongarch/kvm/main.c
>
> diff --git a/arch/loongarch/include/asm/cpu-features.h b/arch/loongarch/include/asm/cpu-features.h
> index b07974218..23e7c3ae5 100644
> --- a/arch/loongarch/include/asm/cpu-features.h
> +++ b/arch/loongarch/include/asm/cpu-features.h
> @@ -64,5 +64,27 @@
> #define cpu_has_guestid cpu_opt(LOONGARCH_CPU_GUESTID)
> #define cpu_has_hypervisor cpu_opt(LOONGARCH_CPU_HYPERVISOR)
>
> +#define cpu_has_matc_guest (cpu_data[0].guest_cfg & (1 << 0))
> +#define cpu_has_matc_root (cpu_data[0].guest_cfg & (1 << 1))
> +#define cpu_has_matc_nest (cpu_data[0].guest_cfg & (1 << 2))
> +#define cpu_has_sitp (cpu_data[0].guest_cfg & (1 << 6))
> +#define cpu_has_titp (cpu_data[0].guest_cfg & (1 << 8))
> +#define cpu_has_toep (cpu_data[0].guest_cfg & (1 << 10))
> +#define cpu_has_topp (cpu_data[0].guest_cfg & (1 << 12))
> +#define cpu_has_torup (cpu_data[0].guest_cfg & (1 << 14))
> +#define cpu_has_gcip_all (cpu_data[0].guest_cfg & (1 << 16))
> +#define cpu_has_gcip_hit (cpu_data[0].guest_cfg & (1 << 17))
> +#define cpu_has_gcip_secure (cpu_data[0].guest_cfg & (1 << 18))
Why not use BIT() for all of those "<<" statements?
> +#define KVM_GET_CSRS _IOWR(KVMIO, 0xc5, struct kvm_csrs)
> +#define KVM_SET_CSRS _IOW(KVMIO, 0xc6, struct kvm_csrs)
Why does this arch need new ioctls?
thanks,
greg k-h
^ permalink raw reply [flat|nested] 36+ messages in thread
* Re: [PATCH v1 03/24] LoongArch: KVM: Implement vcpu create,run,destroy operations.
2023-02-14 2:56 ` [PATCH v1 03/24] LoongArch: KVM: Implement vcpu create,run,destroy operations Tianrui Zhao
@ 2023-02-14 6:40 ` Greg Kroah-Hartman
2023-02-14 9:03 ` Tianrui Zhao
0 siblings, 1 reply; 36+ messages in thread
From: Greg Kroah-Hartman @ 2023-02-14 6:40 UTC (permalink / raw)
To: Tianrui Zhao
Cc: Paolo Bonzini, Huacai Chen, WANG Xuerui, loongarch, linux-kernel,
kvm, Jens Axboe, Mark Brown, Alex Deucher
On Tue, Feb 14, 2023 at 10:56:27AM +0800, Tianrui Zhao wrote:
> Implement loongarch vcpu related operations:
> 1. Implement vcpu create interface, saving some info into vcpu arch
> structure such as vcpu exception entrance, vcpu enter guest pointer,
> etc. Init vcpu timer and set address translation mode when vcpu create.
> 2. Implement vcpu run interface, handling mmio, iocsr reading fault
> and deliver interrupt, lose fpu before vcpu enter guest.
> 3. Implement vcpu handle exit interface, getting the exit code by ESTAT
> register and using kvm exception vector to handle it.
Again, when you have to list different things in a patch, that is a huge
hint that it needs to be split up into smaller pieces.
thanks,
greg k-h
^ permalink raw reply [flat|nested] 36+ messages in thread
* Re: [PATCH v1 22/24] LoongArch: KVM: Implement vcpu world switch
2023-02-14 2:56 ` [PATCH v1 22/24] LoongArch: KVM: Implement vcpu world switch Tianrui Zhao
@ 2023-02-14 7:07 ` kernel test robot
0 siblings, 0 replies; 36+ messages in thread
From: kernel test robot @ 2023-02-14 7:07 UTC (permalink / raw)
To: Tianrui Zhao, Paolo Bonzini
Cc: oe-kbuild-all, Huacai Chen, WANG Xuerui, Greg Kroah-Hartman,
loongarch, linux-kernel, kvm, Jens Axboe, Mark Brown,
Alex Deucher
Hi Tianrui,
Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on kvm/queue]
[also build test WARNING on linus/master v6.2-rc8]
[cannot apply to kvm/linux-next next-20230214]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Tianrui-Zhao/LoongArch-KVM-Implement-kvm-module-related-interface/20230214-110506
base: https://git.kernel.org/pub/scm/virt/kvm/kvm.git queue
patch link: https://lore.kernel.org/r/20230214025648.1898508-23-zhaotianrui%40loongson.cn
patch subject: [PATCH v1 22/24] LoongArch: KVM: Implement vcpu world switch
config: loongarch-allyesconfig (https://download.01.org/0day-ci/archive/20230214/202302141408.1hBkpMAf-lkp@intel.com/config)
compiler: loongarch64-linux-gcc (GCC) 12.1.0
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# https://github.com/intel-lab-lkp/linux/commit/1adfa2faabc606d0813446b2d2111e04aa3d2828
git remote add linux-review https://github.com/intel-lab-lkp/linux
git fetch --no-tags linux-review Tianrui-Zhao/LoongArch-KVM-Implement-kvm-module-related-interface/20230214-110506
git checkout 1adfa2faabc606d0813446b2d2111e04aa3d2828
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=loongarch olddefconfig
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=loongarch prepare
If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202302141408.1hBkpMAf-lkp@intel.com/
All warnings (new ones prefixed by >>):
arch/loongarch/kernel/asm-offsets.c:17:6: warning: no previous prototype for 'output_ptreg_defines' [-Wmissing-prototypes]
17 | void output_ptreg_defines(void)
| ^~~~~~~~~~~~~~~~~~~~
arch/loongarch/kernel/asm-offsets.c:64:6: warning: no previous prototype for 'output_task_defines' [-Wmissing-prototypes]
64 | void output_task_defines(void)
| ^~~~~~~~~~~~~~~~~~~
arch/loongarch/kernel/asm-offsets.c:79:6: warning: no previous prototype for 'output_thread_info_defines' [-Wmissing-prototypes]
79 | void output_thread_info_defines(void)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~
arch/loongarch/kernel/asm-offsets.c:95:6: warning: no previous prototype for 'output_thread_defines' [-Wmissing-prototypes]
95 | void output_thread_defines(void)
| ^~~~~~~~~~~~~~~~~~~~~
arch/loongarch/kernel/asm-offsets.c:138:6: warning: no previous prototype for 'output_thread_fpu_defines' [-Wmissing-prototypes]
138 | void output_thread_fpu_defines(void)
| ^~~~~~~~~~~~~~~~~~~~~~~~~
arch/loongarch/kernel/asm-offsets.c:178:6: warning: no previous prototype for 'output_mm_defines' [-Wmissing-prototypes]
178 | void output_mm_defines(void)
| ^~~~~~~~~~~~~~~~~
arch/loongarch/kernel/asm-offsets.c:210:6: warning: no previous prototype for 'output_sc_defines' [-Wmissing-prototypes]
210 | void output_sc_defines(void)
| ^~~~~~~~~~~~~~~~~
arch/loongarch/kernel/asm-offsets.c:218:6: warning: no previous prototype for 'output_signal_defines' [-Wmissing-prototypes]
218 | void output_signal_defines(void)
| ^~~~~~~~~~~~~~~~~~~~~
arch/loongarch/kernel/asm-offsets.c:256:6: warning: no previous prototype for 'output_smpboot_defines' [-Wmissing-prototypes]
256 | void output_smpboot_defines(void)
| ^~~~~~~~~~~~~~~~~~~~~~
arch/loongarch/kernel/asm-offsets.c:266:6: warning: no previous prototype for 'output_pbe_defines' [-Wmissing-prototypes]
266 | void output_pbe_defines(void)
| ^~~~~~~~~~~~~~~~~~
>> arch/loongarch/kernel/asm-offsets.c:277:6: warning: no previous prototype for 'output_kvm_defines' [-Wmissing-prototypes]
277 | void output_kvm_defines(void)
| ^~~~~~~~~~~~~~~~~~
--
arch/loongarch/kernel/asm-offsets.c:17:6: warning: no previous prototype for 'output_ptreg_defines' [-Wmissing-prototypes]
17 | void output_ptreg_defines(void)
| ^~~~~~~~~~~~~~~~~~~~
arch/loongarch/kernel/asm-offsets.c:64:6: warning: no previous prototype for 'output_task_defines' [-Wmissing-prototypes]
64 | void output_task_defines(void)
| ^~~~~~~~~~~~~~~~~~~
arch/loongarch/kernel/asm-offsets.c:79:6: warning: no previous prototype for 'output_thread_info_defines' [-Wmissing-prototypes]
79 | void output_thread_info_defines(void)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~
arch/loongarch/kernel/asm-offsets.c:95:6: warning: no previous prototype for 'output_thread_defines' [-Wmissing-prototypes]
95 | void output_thread_defines(void)
| ^~~~~~~~~~~~~~~~~~~~~
arch/loongarch/kernel/asm-offsets.c:138:6: warning: no previous prototype for 'output_thread_fpu_defines' [-Wmissing-prototypes]
138 | void output_thread_fpu_defines(void)
| ^~~~~~~~~~~~~~~~~~~~~~~~~
arch/loongarch/kernel/asm-offsets.c:178:6: warning: no previous prototype for 'output_mm_defines' [-Wmissing-prototypes]
178 | void output_mm_defines(void)
| ^~~~~~~~~~~~~~~~~
arch/loongarch/kernel/asm-offsets.c:210:6: warning: no previous prototype for 'output_sc_defines' [-Wmissing-prototypes]
210 | void output_sc_defines(void)
| ^~~~~~~~~~~~~~~~~
arch/loongarch/kernel/asm-offsets.c:218:6: warning: no previous prototype for 'output_signal_defines' [-Wmissing-prototypes]
218 | void output_signal_defines(void)
| ^~~~~~~~~~~~~~~~~~~~~
arch/loongarch/kernel/asm-offsets.c:256:6: warning: no previous prototype for 'output_smpboot_defines' [-Wmissing-prototypes]
256 | void output_smpboot_defines(void)
| ^~~~~~~~~~~~~~~~~~~~~~
arch/loongarch/kernel/asm-offsets.c:266:6: warning: no previous prototype for 'output_pbe_defines' [-Wmissing-prototypes]
266 | void output_pbe_defines(void)
| ^~~~~~~~~~~~~~~~~~
>> arch/loongarch/kernel/asm-offsets.c:277:6: warning: no previous prototype for 'output_kvm_defines' [-Wmissing-prototypes]
277 | void output_kvm_defines(void)
| ^~~~~~~~~~~~~~~~~~
<stdin>:569:2: warning: #warning syscall fstat not implemented [-Wcpp]
vim +/output_kvm_defines +277 arch/loongarch/kernel/asm-offsets.c
217
> 218 void output_signal_defines(void)
219 {
220 COMMENT("Linux signal numbers.");
221 DEFINE(_SIGHUP, SIGHUP);
222 DEFINE(_SIGINT, SIGINT);
223 DEFINE(_SIGQUIT, SIGQUIT);
224 DEFINE(_SIGILL, SIGILL);
225 DEFINE(_SIGTRAP, SIGTRAP);
226 DEFINE(_SIGIOT, SIGIOT);
227 DEFINE(_SIGABRT, SIGABRT);
228 DEFINE(_SIGFPE, SIGFPE);
229 DEFINE(_SIGKILL, SIGKILL);
230 DEFINE(_SIGBUS, SIGBUS);
231 DEFINE(_SIGSEGV, SIGSEGV);
232 DEFINE(_SIGSYS, SIGSYS);
233 DEFINE(_SIGPIPE, SIGPIPE);
234 DEFINE(_SIGALRM, SIGALRM);
235 DEFINE(_SIGTERM, SIGTERM);
236 DEFINE(_SIGUSR1, SIGUSR1);
237 DEFINE(_SIGUSR2, SIGUSR2);
238 DEFINE(_SIGCHLD, SIGCHLD);
239 DEFINE(_SIGPWR, SIGPWR);
240 DEFINE(_SIGWINCH, SIGWINCH);
241 DEFINE(_SIGURG, SIGURG);
242 DEFINE(_SIGIO, SIGIO);
243 DEFINE(_SIGSTOP, SIGSTOP);
244 DEFINE(_SIGTSTP, SIGTSTP);
245 DEFINE(_SIGCONT, SIGCONT);
246 DEFINE(_SIGTTIN, SIGTTIN);
247 DEFINE(_SIGTTOU, SIGTTOU);
248 DEFINE(_SIGVTALRM, SIGVTALRM);
249 DEFINE(_SIGPROF, SIGPROF);
250 DEFINE(_SIGXCPU, SIGXCPU);
251 DEFINE(_SIGXFSZ, SIGXFSZ);
252 BLANK();
253 }
254
255 #ifdef CONFIG_SMP
256 void output_smpboot_defines(void)
257 {
258 COMMENT("Linux smp cpu boot offsets.");
259 OFFSET(CPU_BOOT_STACK, secondary_data, stack);
260 OFFSET(CPU_BOOT_TINFO, secondary_data, thread_info);
261 BLANK();
262 }
263 #endif
264
265 #ifdef CONFIG_HIBERNATION
266 void output_pbe_defines(void)
267 {
268 COMMENT(" Linux struct pbe offsets. ");
269 OFFSET(PBE_ADDRESS, pbe, address);
270 OFFSET(PBE_ORIG_ADDRESS, pbe, orig_address);
271 OFFSET(PBE_NEXT, pbe, next);
272 DEFINE(PBE_SIZE, sizeof(struct pbe));
273 BLANK();
274 }
275 #endif
276
> 277 void output_kvm_defines(void)
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests
^ permalink raw reply [flat|nested] 36+ messages in thread
* Re: [PATCH v1 01/24] LoongArch: KVM: Implement kvm module related interface
2023-02-14 6:38 ` Greg Kroah-Hartman
@ 2023-02-14 9:00 ` Tianrui Zhao
2023-02-14 9:58 ` Greg Kroah-Hartman
0 siblings, 1 reply; 36+ messages in thread
From: Tianrui Zhao @ 2023-02-14 9:00 UTC (permalink / raw)
To: Greg Kroah-Hartman
Cc: Paolo Bonzini, Huacai Chen, WANG Xuerui, loongarch, linux-kernel,
kvm, Jens Axboe, Mark Brown, Alex Deucher
在 2023年02月14日 14:38, Greg Kroah-Hartman 写道:
> On Tue, Feb 14, 2023 at 10:56:25AM +0800, Tianrui Zhao wrote:
>> 1. Implement loongarch kvm module init, module exit interface,
>> using kvm context to save the vpid info and vcpu world switch
>> interface pointer.
>> 2. Implement kvm hardware enable, disable interface, setting
>> the guest config reg to enable virtualization features.
>> 3. Add kvm related headers.
> Shouldn't this be 3 different patches instead?
Thanks, I will separate this to 3 different patches.
>
>> Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
>> ---
>> arch/loongarch/include/asm/cpu-features.h | 22 ++
>> arch/loongarch/include/asm/kvm_host.h | 257 ++++++++++++++++++++++
>> arch/loongarch/include/asm/kvm_types.h | 11 +
>> arch/loongarch/include/uapi/asm/kvm.h | 121 ++++++++++
>> arch/loongarch/kvm/main.c | 152 +++++++++++++
>> include/uapi/linux/kvm.h | 15 ++
>> 6 files changed, 578 insertions(+)
>> create mode 100644 arch/loongarch/include/asm/kvm_host.h
>> create mode 100644 arch/loongarch/include/asm/kvm_types.h
>> create mode 100644 arch/loongarch/include/uapi/asm/kvm.h
>> create mode 100644 arch/loongarch/kvm/main.c
>>
>> diff --git a/arch/loongarch/include/asm/cpu-features.h b/arch/loongarch/include/asm/cpu-features.h
>> index b07974218..23e7c3ae5 100644
>> --- a/arch/loongarch/include/asm/cpu-features.h
>> +++ b/arch/loongarch/include/asm/cpu-features.h
>> @@ -64,5 +64,27 @@
>> #define cpu_has_guestid cpu_opt(LOONGARCH_CPU_GUESTID)
>> #define cpu_has_hypervisor cpu_opt(LOONGARCH_CPU_HYPERVISOR)
>>
>> +#define cpu_has_matc_guest (cpu_data[0].guest_cfg & (1 << 0))
>> +#define cpu_has_matc_root (cpu_data[0].guest_cfg & (1 << 1))
>> +#define cpu_has_matc_nest (cpu_data[0].guest_cfg & (1 << 2))
>> +#define cpu_has_sitp (cpu_data[0].guest_cfg & (1 << 6))
>> +#define cpu_has_titp (cpu_data[0].guest_cfg & (1 << 8))
>> +#define cpu_has_toep (cpu_data[0].guest_cfg & (1 << 10))
>> +#define cpu_has_topp (cpu_data[0].guest_cfg & (1 << 12))
>> +#define cpu_has_torup (cpu_data[0].guest_cfg & (1 << 14))
>> +#define cpu_has_gcip_all (cpu_data[0].guest_cfg & (1 << 16))
>> +#define cpu_has_gcip_hit (cpu_data[0].guest_cfg & (1 << 17))
>> +#define cpu_has_gcip_secure (cpu_data[0].guest_cfg & (1 << 18))
> Why not use BIT() for all of those "<<" statements?
Ok thanks, I will use BIT() to replace those "<<" statements.
>
>> +#define KVM_GET_CSRS _IOWR(KVMIO, 0xc5, struct kvm_csrs)
>> +#define KVM_SET_CSRS _IOW(KVMIO, 0xc6, struct kvm_csrs)
> Why does this arch need new ioctls?
We want to use this ioctl to access multiple csrs at one time. If
without this, we only access one csr.
There is another function, can we use the KVM_GET/SET_MSRS to access our
csrs?
Thanks,
Tianrui Zhao
> thanks,
>
> greg k-h
^ permalink raw reply [flat|nested] 36+ messages in thread
* Re: [PATCH v1 03/24] LoongArch: KVM: Implement vcpu create,run,destroy operations.
2023-02-14 6:40 ` Greg Kroah-Hartman
@ 2023-02-14 9:03 ` Tianrui Zhao
0 siblings, 0 replies; 36+ messages in thread
From: Tianrui Zhao @ 2023-02-14 9:03 UTC (permalink / raw)
To: Greg Kroah-Hartman
Cc: Paolo Bonzini, Huacai Chen, WANG Xuerui, loongarch, linux-kernel,
kvm, Jens Axboe, Mark Brown, Alex Deucher
在 2023年02月14日 14:40, Greg Kroah-Hartman 写道:
> On Tue, Feb 14, 2023 at 10:56:27AM +0800, Tianrui Zhao wrote:
>> Implement loongarch vcpu related operations:
>> 1. Implement vcpu create interface, saving some info into vcpu arch
>> structure such as vcpu exception entrance, vcpu enter guest pointer,
>> etc. Init vcpu timer and set address translation mode when vcpu create.
>> 2. Implement vcpu run interface, handling mmio, iocsr reading fault
>> and deliver interrupt, lose fpu before vcpu enter guest.
>> 3. Implement vcpu handle exit interface, getting the exit code by ESTAT
>> register and using kvm exception vector to handle it.
> Again, when you have to list different things in a patch, that is a huge
> hint that it needs to be split up into smaller pieces.
Thanks for your advice, I will fix my patch and split it into smaller
pieces.
Thanks,
Tianrui Zhao
>
> thanks,
>
> greg k-h
^ permalink raw reply [flat|nested] 36+ messages in thread
* Re: [PATCH v1 01/24] LoongArch: KVM: Implement kvm module related interface
2023-02-14 9:00 ` Tianrui Zhao
@ 2023-02-14 9:58 ` Greg Kroah-Hartman
2023-02-14 13:00 ` Tianrui Zhao
2023-02-14 13:05 ` maobibo
0 siblings, 2 replies; 36+ messages in thread
From: Greg Kroah-Hartman @ 2023-02-14 9:58 UTC (permalink / raw)
To: Tianrui Zhao
Cc: Paolo Bonzini, Huacai Chen, WANG Xuerui, loongarch, linux-kernel,
kvm, Jens Axboe, Mark Brown, Alex Deucher
On Tue, Feb 14, 2023 at 05:00:56PM +0800, Tianrui Zhao wrote:
> > > +#define KVM_GET_CSRS _IOWR(KVMIO, 0xc5, struct kvm_csrs)
> > > +#define KVM_SET_CSRS _IOW(KVMIO, 0xc6, struct kvm_csrs)
> > Why does this arch need new ioctls?
> We want to use this ioctl to access multiple csrs at one time. If without
> this, we only access one csr.
What is wrong with accessing only one csr at a time? Isn't this what
other architectures do?
> There is another function, can we use the KVM_GET/SET_MSRS to access our
> csrs?
I do not know, that's up to the KVM developers to answer.
thanks,
greg k-h
^ permalink raw reply [flat|nested] 36+ messages in thread
* Re: [PATCH v1 01/24] LoongArch: KVM: Implement kvm module related interface
2023-02-14 9:58 ` Greg Kroah-Hartman
@ 2023-02-14 13:00 ` Tianrui Zhao
2023-02-16 19:34 ` Oliver Upton
2023-02-14 13:05 ` maobibo
1 sibling, 1 reply; 36+ messages in thread
From: Tianrui Zhao @ 2023-02-14 13:00 UTC (permalink / raw)
To: Greg Kroah-Hartman
Cc: Paolo Bonzini, Huacai Chen, WANG Xuerui, loongarch, linux-kernel,
kvm, Jens Axboe, Mark Brown, Alex Deucher
在 2023年02月14日 17:58, Greg Kroah-Hartman 写道:
> On Tue, Feb 14, 2023 at 05:00:56PM +0800, Tianrui Zhao wrote:
>>>> +#define KVM_GET_CSRS _IOWR(KVMIO, 0xc5, struct kvm_csrs)
>>>> +#define KVM_SET_CSRS _IOW(KVMIO, 0xc6, struct kvm_csrs)
>>> Why does this arch need new ioctls?
>> We want to use this ioctl to access multiple csrs at one time. If without
>> this, we only access one csr.
> What is wrong with accessing only one csr at a time? Isn't this what
> other architectures do?
Generally, using KVM_GET_ONE_GET ioctl to get one reg, but we want a
more convenient interface to get serial regs at one time, so we add this
ioctl.
And in x86 platform, using KVM_GET_MSRS to access multiple registers. and
our functions reference this.
Thanks,
Tianrui Zhao
>
>> There is another function, can we use the KVM_GET/SET_MSRS to access our
>> csrs?
> I do not know, that's up to the KVM developers to answer.
>
> thanks,
>
> greg k-h
^ permalink raw reply [flat|nested] 36+ messages in thread
* Re: [PATCH v1 01/24] LoongArch: KVM: Implement kvm module related interface
2023-02-14 9:58 ` Greg Kroah-Hartman
2023-02-14 13:00 ` Tianrui Zhao
@ 2023-02-14 13:05 ` maobibo
1 sibling, 0 replies; 36+ messages in thread
From: maobibo @ 2023-02-14 13:05 UTC (permalink / raw)
To: Greg Kroah-Hartman, Tianrui Zhao
Cc: Paolo Bonzini, Huacai Chen, WANG Xuerui, loongarch, linux-kernel,
kvm, Jens Axboe, Mark Brown, Alex Deucher
在 2023/2/14 17:58, Greg Kroah-Hartman 写道:
> On Tue, Feb 14, 2023 at 05:00:56PM +0800, Tianrui Zhao wrote:
>>>> +#define KVM_GET_CSRS _IOWR(KVMIO, 0xc5, struct kvm_csrs)
>>>> +#define KVM_SET_CSRS _IOW(KVMIO, 0xc6, struct kvm_csrs)
>>> Why does this arch need new ioctls?
>> We want to use this ioctl to access multiple csrs at one time. If without
>> this, we only access one csr.
>
> What is wrong with accessing only one csr at a time? Isn't this what
> other architectures do?
It is ok to access CSR register once at a time, the other platforms do this
except x86 platform. Only that I think that batch method is better such as
KVM_GET/SET_MSRS ioctl cmds in x86.
Regards
Bibo, Mao
>
>> There is another function, can we use the KVM_GET/SET_MSRS to access our
>> csrs?
>
> I do not know, that's up to the KVM developers to answer.
>
> thanks,
>
> greg k-h
^ permalink raw reply [flat|nested] 36+ messages in thread
* Re: [PATCH v1 01/24] LoongArch: KVM: Implement kvm module related interface
2023-02-14 13:00 ` Tianrui Zhao
@ 2023-02-16 19:34 ` Oliver Upton
2023-02-17 1:27 ` Tianrui Zhao
2023-02-17 1:33 ` maobibo
0 siblings, 2 replies; 36+ messages in thread
From: Oliver Upton @ 2023-02-16 19:34 UTC (permalink / raw)
To: Tianrui Zhao
Cc: Greg Kroah-Hartman, Paolo Bonzini, Huacai Chen, WANG Xuerui,
loongarch, linux-kernel, kvm, Jens Axboe, Mark Brown,
Alex Deucher
On Tue, Feb 14, 2023 at 09:00:50PM +0800, Tianrui Zhao wrote:
> 在 2023年02月14日 17:58, Greg Kroah-Hartman 写道:
> > On Tue, Feb 14, 2023 at 05:00:56PM +0800, Tianrui Zhao wrote:
> > > > > +#define KVM_GET_CSRS _IOWR(KVMIO, 0xc5, struct kvm_csrs)
> > > > > +#define KVM_SET_CSRS _IOW(KVMIO, 0xc6, struct kvm_csrs)
> > > > Why does this arch need new ioctls?
> > > We want to use this ioctl to access multiple csrs at one time. If without
> > > this, we only access one csr.
> > What is wrong with accessing only one csr at a time? Isn't this what
> > other architectures do?
>
> Generally, using KVM_GET_ONE_GET ioctl to get one reg, but we want a
> more convenient interface to get serial regs at one time, so we add this
> ioctl.
Have you found register accesses through the KVM_{GET,SET}_ONE_REG
ioctls to actually be a bounding issue? I'd be surprised if that were
actually the case.
An architecture-neutral implementation was entertained a few years ago
[*], but even then it saved an inconsequential amount of time relative
to the rest of VM serialization (at least for arm64). The one thing that
series got right was to share the plumbing across all architectures that
use the ONE_REG interface (i.e. everyone but x86).
If you have data that supports the thesis that a batched ioctl is
useful then please do share. But in any case this should not use an ioctl
tied down to a single architecture.
[*] https://lore.kernel.org/kvm/20201120125616.14436-1-darkhan@amazon.com/
--
Thanks,
Oliver
^ permalink raw reply [flat|nested] 36+ messages in thread
* Re: [PATCH v1 01/24] LoongArch: KVM: Implement kvm module related interface
2023-02-16 19:34 ` Oliver Upton
@ 2023-02-17 1:27 ` Tianrui Zhao
2023-02-17 1:33 ` maobibo
1 sibling, 0 replies; 36+ messages in thread
From: Tianrui Zhao @ 2023-02-17 1:27 UTC (permalink / raw)
To: Oliver Upton
Cc: Greg Kroah-Hartman, Paolo Bonzini, Huacai Chen, WANG Xuerui,
loongarch, linux-kernel, kvm, Jens Axboe, Mark Brown,
Alex Deucher
在 2023年02月17日 03:34, Oliver Upton 写道:
> On Tue, Feb 14, 2023 at 09:00:50PM +0800, Tianrui Zhao wrote:
>> 在 2023年02月14日 17:58, Greg Kroah-Hartman 写道:
>>> On Tue, Feb 14, 2023 at 05:00:56PM +0800, Tianrui Zhao wrote:
>>>>>> +#define KVM_GET_CSRS _IOWR(KVMIO, 0xc5, struct kvm_csrs)
>>>>>> +#define KVM_SET_CSRS _IOW(KVMIO, 0xc6, struct kvm_csrs)
>>>>> Why does this arch need new ioctls?
>>>> We want to use this ioctl to access multiple csrs at one time. If without
>>>> this, we only access one csr.
>>> What is wrong with accessing only one csr at a time? Isn't this what
>>> other architectures do?
>> Generally, using KVM_GET_ONE_GET ioctl to get one reg, but we want a
>> more convenient interface to get serial regs at one time, so we add this
>> ioctl.
> Have you found register accesses through the KVM_{GET,SET}_ONE_REG
> ioctls to actually be a bounding issue? I'd be surprised if that were
> actually the case.
>
> An architecture-neutral implementation was entertained a few years ago
> [*], but even then it saved an inconsequential amount of time relative
> to the rest of VM serialization (at least for arm64). The one thing that
> series got right was to share the plumbing across all architectures that
> use the ONE_REG interface (i.e. everyone but x86).
>
> If you have data that supports the thesis that a batched ioctl is
> useful then please do share. But in any case this should not use an ioctl
> tied down to a single architecture.
>
> [*] https://lore.kernel.org/kvm/20201120125616.14436-1-darkhan@amazon.com/
>
Thanks for your explanation, and we have decided to remove this ioctls.
thanks,
Tianrui Zhao
^ permalink raw reply [flat|nested] 36+ messages in thread
* Re: [PATCH v1 01/24] LoongArch: KVM: Implement kvm module related interface
2023-02-16 19:34 ` Oliver Upton
2023-02-17 1:27 ` Tianrui Zhao
@ 2023-02-17 1:33 ` maobibo
1 sibling, 0 replies; 36+ messages in thread
From: maobibo @ 2023-02-17 1:33 UTC (permalink / raw)
To: Oliver Upton, Tianrui Zhao
Cc: Greg Kroah-Hartman, Paolo Bonzini, Huacai Chen, WANG Xuerui,
loongarch, linux-kernel, kvm, Jens Axboe, Mark Brown,
Alex Deucher
在 2023/2/17 03:34, Oliver Upton 写道:
> On Tue, Feb 14, 2023 at 09:00:50PM +0800, Tianrui Zhao wrote:
>> 在 2023年02月14日 17:58, Greg Kroah-Hartman 写道:
>>> On Tue, Feb 14, 2023 at 05:00:56PM +0800, Tianrui Zhao wrote:
>>>>>> +#define KVM_GET_CSRS _IOWR(KVMIO, 0xc5, struct kvm_csrs)
>>>>>> +#define KVM_SET_CSRS _IOW(KVMIO, 0xc6, struct kvm_csrs)
>>>>> Why does this arch need new ioctls?
>>>> We want to use this ioctl to access multiple csrs at one time. If without
>>>> this, we only access one csr.
>>> What is wrong with accessing only one csr at a time? Isn't this what
>>> other architectures do?
>>
>> Generally, using KVM_GET_ONE ioctl to get one reg, but we want a
>> more convenient interface to get serial regs at one time, so we add this
>> ioctl.
>
> Have you found register accesses through the KVM_{GET,SET}_ONE_REG
> ioctls to actually be a bounding issue? I'd be surprised if that were
> actually the case.
>
> An architecture-neutral implementation was entertained a few years ago
> [*], but even then it saved an inconsequential amount of time relative
> to the rest of VM serialization (at least for arm64). The one thing that
> series got right was to share the plumbing across all architectures that
> use the ONE_REG interface (i.e. everyone but x86).
>
> If you have data that supports the thesis that a batched ioctl is
> useful then please do share. But in any case this should not use an ioctl
> tied down to a single architecture.
we found this issue during migration downtime stage, all vcpus will get
vcpu hw registers by KVM_GET_ONE_REG interface. If the virtual machine
has many vcpus, it will increase downtime time and reduce migration success
ratio; however it is just in theory and there is no actual data supporting
the point.
I am newbie for kvm:), and we will use KVM_GET_ONE_REG interface for loongarch
kvm for updated patches, which is common for all architectures. I just think
that it is normal to get many registers just like ptrace function, ptrace
regset API can be used to get many registers at one time.
Regards
Bibo, Mao
>
> [*] https://lore.kernel.org/kvm/20201120125616.14436-1-darkhan@amazon.com/
>
^ permalink raw reply [flat|nested] 36+ messages in thread
end of thread, other threads:[~2023-02-17 1:33 UTC | newest]
Thread overview: 36+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-02-14 2:56 [PATCH v1 00/24] Add KVM LoongArch support Tianrui Zhao
2023-02-14 2:56 ` [PATCH v1 01/24] LoongArch: KVM: Implement kvm module related interface Tianrui Zhao
2023-02-14 6:38 ` Greg Kroah-Hartman
2023-02-14 9:00 ` Tianrui Zhao
2023-02-14 9:58 ` Greg Kroah-Hartman
2023-02-14 13:00 ` Tianrui Zhao
2023-02-16 19:34 ` Oliver Upton
2023-02-17 1:27 ` Tianrui Zhao
2023-02-17 1:33 ` maobibo
2023-02-14 13:05 ` maobibo
2023-02-14 2:56 ` [PATCH v1 02/24] LoongArch: KVM: Implement VM related functions Tianrui Zhao
2023-02-14 2:56 ` [PATCH v1 03/24] LoongArch: KVM: Implement vcpu create,run,destroy operations Tianrui Zhao
2023-02-14 6:40 ` Greg Kroah-Hartman
2023-02-14 9:03 ` Tianrui Zhao
2023-02-14 2:56 ` [PATCH v1 04/24] LoongArch: KVM: Implement vcpu get, vcpu set registers Tianrui Zhao
2023-02-14 2:56 ` [PATCH v1 05/24] LoongArch: KVM: Implement vcpu ENABLE_CAP, CHECK_EXTENSION ioctl interface Tianrui Zhao
2023-02-14 2:56 ` [PATCH v1 06/24] LoongArch: KVM: Implement fpu related operations for vcpu Tianrui Zhao
2023-02-14 2:56 ` [PATCH v1 07/24] LoongArch: KVM: Implement vcpu interrupt operations Tianrui Zhao
2023-02-14 2:56 ` [PATCH v1 08/24] LoongArch: KVM: Implement misc vcpu related interfaces Tianrui Zhao
2023-02-14 2:56 ` [PATCH v1 09/24] LoongArch: KVM: Implement vcpu load and vcpu put operations Tianrui Zhao
2023-02-14 2:56 ` [PATCH v1 10/24] LoongArch: KVM: Implement vcpu status description Tianrui Zhao
2023-02-14 2:56 ` [PATCH v1 11/24] LoongArch: KVM: Implement update VM id function Tianrui Zhao
2023-02-14 2:56 ` [PATCH v1 12/24] LoongArch: KVM: Implement virtual machine tlb operations Tianrui Zhao
2023-02-14 2:56 ` [PATCH v1 13/24] LoongArch: KVM: Implement vcpu timer operations Tianrui Zhao
2023-02-14 2:56 ` [PATCH v1 14/24] LoongArch: KVM: Implement kvm mmu operations Tianrui Zhao
2023-02-14 2:56 ` [PATCH v1 15/24] LoongArch: KVM: Implement handle csr excption Tianrui Zhao
2023-02-14 2:56 ` [PATCH v1 16/24] LoongArch: KVM: Implement handle iocsr exception Tianrui Zhao
2023-02-14 2:56 ` [PATCH v1 17/24] LoongArch: KVM: Implement handle idle exception Tianrui Zhao
2023-02-14 2:56 ` [PATCH v1 18/24] LoongArch: KVM: Implement handle gspr exception Tianrui Zhao
2023-02-14 2:56 ` [PATCH v1 19/24] LoongArch: KVM: Implement handle mmio exception Tianrui Zhao
2023-02-14 2:56 ` [PATCH v1 20/24] LoongArch: KVM: Implement handle fpu exception Tianrui Zhao
2023-02-14 2:56 ` [PATCH v1 21/24] LoongArch: KVM: Implement kvm exception vector Tianrui Zhao
2023-02-14 2:56 ` [PATCH v1 22/24] LoongArch: KVM: Implement vcpu world switch Tianrui Zhao
2023-02-14 7:07 ` kernel test robot
2023-02-14 2:56 ` [PATCH v1 23/24] LoongArch: KVM: Implement probe virtualization when loongarch cpu init Tianrui Zhao
2023-02-14 2:56 ` [PATCH v1 24/24] LoongArch: KVM: Enable kvm config and add the makefile Tianrui Zhao
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