Re: [PATCH V2 1/2] kvm tools: Add initial SPAPR PPC64 architecture

[Matt Evans <matt@ozlabs.org>]

Heya Alex,

On 13/12/11 19:23, Alexander Graf wrote:
> 
> On 13.12.2011, at 08:00, Matt Evans <matt@ozlabs.org> wrote:
> 
>> This patch adds a new arch directory, powerpc, basic file structure, register
>> setup and where necessary stubs out arch-specific functions (e.g. interrupts,
>> runloop exits) that later patches will provide.  The target is an
>> SPAPR-compliant PPC64 machine (i.e. pSeries); there is no support for PPC32 or
>> 'bare metal' PPC64 guests as yet.  Subsequent patches implement the hcalls and
>> RTAS required to boot SPAPR pSeries kernels.
>>
>> Memory is mapped from hugetlbfs (as that is currently required by upstream PPC64
>> HV-mode KVM).  The mapping of a VRMA region is yet to be implemented; this is
>> only necessary on processors that don't support VRMA, e.g. <= P6.  Work is
>> therefore needed to get this going on pre-P7 CPUs.
>>
>> Processor state is set up as a guest kernel would expect (both primary and
>> secondaries), and SMP is fully supported.
>>
>> Finally, support is added for simply loading flat binary kernels (plus initrd).
>> (bzImages are not used on PPC, and this series does not add zImage support or an
>> ELF loader.)  The intention is to later support loading firmware such as SLOF.
>>
>> Signed-off-by: Matt Evans <matt@ozlabs.org>
>> ---
>> tools/kvm/Makefile                           |   10 +
>> tools/kvm/kvm.c                              |    3 +
>> tools/kvm/powerpc/include/kvm/barrier.h      |    6 +
>> tools/kvm/powerpc/include/kvm/kvm-arch.h     |   72 ++++++++
>> tools/kvm/powerpc/include/kvm/kvm-cpu-arch.h |   66 ++++++++
>> tools/kvm/powerpc/ioport.c                   |   18 ++
>> tools/kvm/powerpc/irq.c                      |   40 +++++
>> tools/kvm/powerpc/kvm-cpu.c                  |  233 ++++++++++++++++++++++++++
>> tools/kvm/powerpc/kvm.c                      |  187 +++++++++++++++++++++
>> 9 files changed, 635 insertions(+), 0 deletions(-)
>> create mode 100644 tools/kvm/powerpc/include/kvm/barrier.h
>> create mode 100644 tools/kvm/powerpc/include/kvm/kvm-arch.h
>> create mode 100644 tools/kvm/powerpc/include/kvm/kvm-cpu-arch.h
>> create mode 100644 tools/kvm/powerpc/ioport.c
>> create mode 100644 tools/kvm/powerpc/irq.c
>> create mode 100644 tools/kvm/powerpc/kvm-cpu.c
>> create mode 100644 tools/kvm/powerpc/kvm.c
>>
>> diff --git a/tools/kvm/Makefile b/tools/kvm/Makefile
>> index 2bf70c9..3f1e84a 100644
>> --- a/tools/kvm/Makefile
>> +++ b/tools/kvm/Makefile
>> @@ -124,6 +124,16 @@ ifeq ($(ARCH),x86)
>>    OTHEROBJS    += x86/bios/bios-rom.o
>>    ARCH_INCLUDE := x86/include
>> endif
>> +# POWER/ppc:  Actually only support ppc64 currently.
> 
> Why? I usually run ppc32 user land. Doesn't that expose 'ppc' here?

Not quite sure what you mean here; do you mean 32bit distro?  (Will still get 'ppc64' from a 64-bit kernel.)

There is clearly some work required here to determine what to build for when we
eventually support PPC32 guests/hosts though I'm not sure how that will look
yet.  This is designed to break if you build on a 32bit kernel, as if it DID
build, it wouldn't run anyway.  (It's building -m64 too...

>> +ifeq ($(uname_M), ppc64)
>> +    DEFINES += -DCONFIG_PPC
>> +    OBJS    += powerpc/ioport.o
>> +    OBJS    += powerpc/irq.o
>> +    OBJS    += powerpc/kvm.o
>> +    OBJS    += powerpc/kvm-cpu.o
>> +    ARCH_INCLUDE := powerpc/include
>> +    CFLAGS += -m64

...here.)

>> +endif
>>
>> ###
>>
>> diff --git a/tools/kvm/kvm.c b/tools/kvm/kvm.c
>> index 35ca2c5..3fb46f6 100644
>> --- a/tools/kvm/kvm.c
>> +++ b/tools/kvm/kvm.c
>> @@ -49,6 +49,9 @@ const char *kvm_exit_reasons[] = {
>>    DEFINE_KVM_EXIT_REASON(KVM_EXIT_DCR),
>>    DEFINE_KVM_EXIT_REASON(KVM_EXIT_NMI),
>>    DEFINE_KVM_EXIT_REASON(KVM_EXIT_INTERNAL_ERROR),
>> +#ifdef CONFIG_PPC64
>> +    DEFINE_KVM_EXIT_REASON(KVM_EXIT_PAPR_HCALL),
>> +#endif
>> };
>>
>> extern struct kvm *kvm;
>> diff --git a/tools/kvm/powerpc/include/kvm/barrier.h b/tools/kvm/powerpc/include/kvm/barrier.h
>> new file mode 100644
>> index 0000000..bc7d179
>> --- /dev/null
>> +++ b/tools/kvm/powerpc/include/kvm/barrier.h
>> @@ -0,0 +1,6 @@
>> +#ifndef _KVM_BARRIER_H_
>> +#define _KVM_BARRIER_H_
>> +
>> +#include <asm/system.h>
>> +
>> +#endif /* _KVM_BARRIER_H_ */
>> diff --git a/tools/kvm/powerpc/include/kvm/kvm-arch.h b/tools/kvm/powerpc/include/kvm/kvm-arch.h
>> new file mode 100644
>> index 0000000..da61774
>> --- /dev/null
>> +++ b/tools/kvm/powerpc/include/kvm/kvm-arch.h
>> @@ -0,0 +1,72 @@
>> +/*
>> + * PPC64 architecture-specific definitions
>> + *
>> + * Copyright 2011 Matt Evans <matt@ozlabs.org>, IBM Corporation.
>> + *
>> + * This program is free software; you can redistribute it and/or modify it
>> + * under the terms of the GNU General Public License version 2 as published
>> + * by the Free Software Foundation.
>> + */
>> +
>> +#ifndef KVM__KVM_ARCH_H
>> +#define KVM__KVM_ARCH_H
>> +
>> +#include <stdbool.h>
>> +#include <linux/types.h>
>> +#include <time.h>
>> +
>> +#define KVM_NR_CPUS            (255)
> 
> Why?

Good question; that's arbitrary & cut-paste I missed. :-)

I'll make this 1024, to match the max sensible NR_CPUS in the PPC64 kernel
(which in turn limits KVM_MAX_VCPUS).

>> +
>> +/*
>> + * MMIO lives after RAM, but it'd be nice if it didn't constantly move.
>> + * Choose a suitably high address, e.g. 63T...  This limits RAM size.
>> + */
>> +#define PPC_MMIO_START            0x3F0000000000UL
>> +#define PPC_MMIO_SIZE            0x010000000000UL
>> +
>> +#define KERNEL_LOAD_ADDR            0x0000000000000000
>> +#define KERNEL_START_ADDR           0x0000000000000000
>> +#define KERNEL_SECONDARY_START_ADDR     0x0000000000000060
>> +#define INITRD_LOAD_ADDR            0x0000000002800000
>> +
>> +#define FDT_MAX_SIZE                0x10000
>> +#define RTAS_MAX_SIZE               0x10000
>> +
>> +#define TIMEBASE_FREQ               512000000ULL
>> +
>> +#define KVM_MMIO_START            PPC_MMIO_START
>> +
>> +/*
>> + * This is the address that pci_get_io_space_block() starts allocating
>> + * from.  Note that this is a PCI bus address.
>> + */
>> +#define KVM_PCI_MMIO_AREA        0x1000000
>> +
>> +struct kvm {
>> +    int            sys_fd;        /* For system ioctls(), i.e. /dev/kvm */
>> +    int            vm_fd;        /* For VM ioctls() */
>> +    timer_t            timerid;    /* Posix timer for interrupts */
>> +
>> +    int            nrcpus;        /* Number of cpus to run */
>> +
>> +    u32            mem_slots;    /* for KVM_SET_USER_MEMORY_REGION */
>> +
>> +    u64            ram_size;
>> +    void            *ram_start;
>> +
>> +    bool            nmi_disabled;
>> +
>> +    bool            single_step;
>> +
>> +    const char        *vmlinux;
>> +    struct disk_image       **disks;
>> +    int                     nr_disks;
>> +    unsigned long        rtas_gra;
>> +    unsigned long        rtas_size;
>> +    unsigned long        fdt_gra;
>> +    unsigned long        initrd_gra;
>> +    unsigned long        initrd_size;
>> +    const char        *name;
>> +};
>> +
>> +#endif /* KVM__KVM_ARCH_H */
>> diff --git a/tools/kvm/powerpc/include/kvm/kvm-cpu-arch.h b/tools/kvm/powerpc/include/kvm/kvm-cpu-arch.h
>> new file mode 100644
>> index 0000000..64e4510
>> --- /dev/null
>> +++ b/tools/kvm/powerpc/include/kvm/kvm-cpu-arch.h
>> @@ -0,0 +1,66 @@
>> +/*
>> + * PPC64 cpu-specific definitions
>> + *
>> + * Copyright 2011 Matt Evans <matt@ozlabs.org>, IBM Corporation.
>> + *
>> + * This program is free software; you can redistribute it and/or modify it
>> + * under the terms of the GNU General Public License version 2 as published
>> + * by the Free Software Foundation.
>> + */
>> +
>> +#ifndef KVM__KVM_CPU_ARCH_H
>> +#define KVM__KVM_CPU_ARCH_H
>> +
>> +/* Architecture-specific kvm_cpu definitions. */
>> +
>> +#include <linux/kvm.h>    /* for struct kvm_regs */
>> +
>> +#include <pthread.h>
>> +
>> +#define MSR_SF        (1UL<<63)
>> +#define MSR_HV        (1UL<<60)
>> +#define MSR_VEC        (1UL<<25)
>> +#define MSR_VSX        (1UL<<23)
>> +#define MSR_POW        (1UL<<18)
>> +#define MSR_EE        (1UL<<15)
>> +#define MSR_PR        (1UL<<14)
>> +#define MSR_FP        (1UL<<13)
>> +#define MSR_ME        (1UL<<12)
>> +#define MSR_FE0        (1UL<<11)
>> +#define MSR_SE        (1UL<<10)
>> +#define MSR_BE        (1UL<<9)
>> +#define MSR_FE1        (1UL<<8)
>> +#define MSR_IR        (1UL<<5)
>> +#define MSR_DR        (1UL<<4)
>> +#define MSR_PMM        (1UL<<2)
>> +#define MSR_RI        (1UL<<1)
>> +#define MSR_LE        (1UL<<0)
>> +
>> +struct kvm;
>> +
>> +struct kvm_cpu {
>> +    pthread_t        thread;        /* VCPU thread */
>> +
>> +    unsigned long        cpu_id;
>> +
>> +    struct kvm        *kvm;        /* parent KVM */
>> +    int            vcpu_fd;    /* For VCPU ioctls() */
>> +    struct kvm_run        *kvm_run;
>> +
>> +    struct kvm_regs        regs;
>> +    struct kvm_sregs    sregs;
>> +    struct kvm_fpu        fpu;
>> +
>> +    u8            is_running;
>> +    u8            paused;
>> +    u8            needs_nmi;
>> +    /*
>> +     * Although PPC KVM doesn't yet support coalesced MMIO, generic code
>> +     * needs this in our kvm_cpu:
>> +     */
>> +    struct kvm_coalesced_mmio_ring  *ring;
>> +};
>> +
>> +void kvm_cpu__irq(struct kvm_cpu *vcpu, int pin, int level);
>> +
>> +#endif /* KVM__KVM_CPU_ARCH_H */
>> diff --git a/tools/kvm/powerpc/ioport.c b/tools/kvm/powerpc/ioport.c
>> new file mode 100644
>> index 0000000..a8e4dc3
>> --- /dev/null
>> +++ b/tools/kvm/powerpc/ioport.c
>> @@ -0,0 +1,18 @@
>> +/*
>> + * PPC64 ioport platform setup.  There isn't any! :-)
>> + *
>> + * Copyright 2011 Matt Evans <matt@ozlabs.org>, IBM Corporation.
>> + *
>> + * This program is free software; you can redistribute it and/or modify it
>> + * under the terms of the GNU General Public License version 2 as published
>> + * by the Free Software Foundation.
>> + */
>> +
>> +#include "kvm/ioport.h"
>> +
>> +#include <stdlib.h>
>> +
>> +void ioport__setup_arch(void)
>> +{
>> +    /* PPC has no legacy ioports to set up */
>> +}
>> diff --git a/tools/kvm/powerpc/irq.c b/tools/kvm/powerpc/irq.c
>> new file mode 100644
>> index 0000000..46aa64f
>> --- /dev/null
>> +++ b/tools/kvm/powerpc/irq.c
>> @@ -0,0 +1,40 @@
>> +/*
>> + * PPC64 IRQ routines
>> + *
>> + * Copyright 2011 Matt Evans <matt@ozlabs.org>, IBM Corporation.
>> + *
>> + * This program is free software; you can redistribute it and/or modify it
>> + * under the terms of the GNU General Public License version 2 as published
>> + * by the Free Software Foundation.
>> + */
>> +
>> +#include "kvm/irq.h"
>> +#include "kvm/kvm.h"
>> +#include "kvm/util.h"
>> +
>> +#include <linux/types.h>
>> +#include <linux/rbtree.h>
>> +#include <linux/list.h>
>> +#include <linux/kvm.h>
>> +#include <sys/ioctl.h>
>> +
>> +#include <stddef.h>
>> +#include <stdlib.h>
>> +
>> +int irq__register_device(u32 dev, u8 *num, u8 *pin, u8 *line)
>> +{
>> +    fprintf(stderr, "irq__register_device(%d, [%d], [%d], [%d]\n",
>> +        dev, *num, *pin, *line);
>> +    return 0;
>> +}
>> +
>> +void irq__init(struct kvm *kvm)
>> +{
>> +    fprintf(stderr, __func__);
>> +}
>> +
>> +int irq__add_msix_route(struct kvm *kvm, struct msi_msg *msg)
>> +{
>> +    die(__FUNCTION__);
>> +    return 0;
>> +}
>> diff --git a/tools/kvm/powerpc/kvm-cpu.c b/tools/kvm/powerpc/kvm-cpu.c
>> new file mode 100644
>> index 0000000..ea99666
>> --- /dev/null
>> +++ b/tools/kvm/powerpc/kvm-cpu.c
>> @@ -0,0 +1,233 @@
>> +/*
>> + * PPC64 processor support
>> + *
>> + * Copyright 2011 Matt Evans <matt@ozlabs.org>, IBM Corporation.
>> + *
>> + * This program is free software; you can redistribute it and/or modify it
>> + * under the terms of the GNU General Public License version 2 as published
>> + * by the Free Software Foundation.
>> + */
>> +
>> +#include "kvm/kvm-cpu.h"
>> +
>> +#include "kvm/symbol.h"
>> +#include "kvm/util.h"
>> +#include "kvm/kvm.h"
>> +
>> +#include <sys/ioctl.h>
>> +#include <sys/mman.h>
>> +#include <signal.h>
>> +#include <stdlib.h>
>> +#include <string.h>
>> +#include <errno.h>
>> +#include <stdio.h>
>> +
>> +static int debug_fd;
>> +
>> +void kvm_cpu__set_debug_fd(int fd)
>> +{
>> +    debug_fd = fd;
>> +}
>> +
>> +int kvm_cpu__get_debug_fd(void)
>> +{
>> +    return debug_fd;
>> +}
>> +
>> +static struct kvm_cpu *kvm_cpu__new(struct kvm *kvm)
>> +{
>> +    struct kvm_cpu *vcpu;
>> +
>> +    vcpu        = calloc(1, sizeof *vcpu);
>> +    if (!vcpu)
>> +        return NULL;
>> +
>> +    vcpu->kvm    = kvm;
>> +
>> +    return vcpu;
>> +}
>> +
>> +void kvm_cpu__delete(struct kvm_cpu *vcpu)
>> +{
>> +    free(vcpu);
>> +}
>> +
>> +struct kvm_cpu *kvm_cpu__init(struct kvm *kvm, unsigned long cpu_id)
>> +{
>> +    struct kvm_cpu *vcpu;
>> +    int mmap_size;
>> +    struct kvm_enable_cap papr_cap = { .cap = KVM_CAP_PPC_PAPR };
>> +
>> +    vcpu        = kvm_cpu__new(kvm);
>> +    if (!vcpu)
>> +        return NULL;
>> +
>> +    vcpu->cpu_id    = cpu_id;
>> +
>> +    vcpu->vcpu_fd = ioctl(vcpu->kvm->vm_fd, KVM_CREATE_VCPU, cpu_id);
>> +    if (vcpu->vcpu_fd < 0)
>> +        die_perror("KVM_CREATE_VCPU ioctl");
>> +
>> +    mmap_size = ioctl(vcpu->kvm->sys_fd, KVM_GET_VCPU_MMAP_SIZE, 0);
>> +    if (mmap_size < 0)
>> +        die_perror("KVM_GET_VCPU_MMAP_SIZE ioctl");
>> +
>> +    vcpu->kvm_run = mmap(NULL, mmap_size, PROT_RW, MAP_SHARED, vcpu->vcpu_fd, 0);
>> +    if (vcpu->kvm_run = MAP_FAILED)
>> +        die("unable to mmap vcpu fd");
>> +
>> +    ioctl(vcpu->vcpu_fd, KVM_ENABLE_CAP, &papr_cap);
> 
> Have you tried running this on PR KVM? That should also need HIOR synchronization.

I have, but only briefly and I admit I built it from a random tree I had lying
around, certainly stale, and immediately hit some "can't emulate MMIO" errors on
some stdu instructions.  I will give it another go with your tree and see if I
can get it working with kvmtool, it would be very cool for that to work.

Thanks for reviewing,


Matt


> [snip]