Re: [PATCH 21/28] kvm tools: Add --hugetlbfs option to specify memory

Matt Evans
2011-12-07T00:35:46Z

On 06/12/11 19:32, Sasha Levin wrote:
> I'm seeing hugetlbfs_path being passed around, but I don't see anything
> that actually does something with it.
>
> Did it get into a different patch? or maybe it wasn't 'git add'ed?

It's actually moved in preparation for the later "[PATCH 1/8] kvm tools: Add
initial SPAPR PPC64 architecture support" patch, which uses it. I could've
mushed that into the later PPC series but I thought it'd be clearer to do the
generic/x86 stuff separately.

Matt

>
> On Tue, 2011-12-06 at 14:41 +1100, Matt Evans wrote:
>> Some architectures may want to use hugetlbfs to mmap() their guest memory, so
>> allow a path to be specified on the commandline and pass it to kvm__arch_init().
>>
>> Signed-off-by: Matt Evans <matt@ozlabs.org>
>> ---
>> tools/kvm/builtin-run.c | 4 +++-
>> tools/kvm/include/kvm/kvm.h | 4 ++--
>> tools/kvm/kvm.c | 4 ++--
>> tools/kvm/x86/kvm.c | 2 +-
>> 4 files changed, 8 insertions(+), 6 deletions(-)
>>
>> diff --git a/tools/kvm/builtin-run.c b/tools/kvm/builtin-run.c
>> index 84aa931..4c88169 100644
>> --- a/tools/kvm/builtin-run.c
>> +++ b/tools/kvm/builtin-run.c
>> @@ -84,6 +84,7 @@ static const char *guest_mac;
>> static const char *host_mac;
>> static const char *script;
>> static const char *guest_name;
>> +static const char *hugetlbfs_path;
>> static struct virtio_net_params *net_params;
>> static bool single_step;
>> static bool readonly_image[MAX_DISK_IMAGES];
>> @@ -422,6 +423,7 @@ static const struct option options[] = {
>> OPT_CALLBACK('\0', "tty", NULL, "tty id",
>> "Remap guest TTY into a pty on the host",
>> tty_parser),
>> + OPT_STRING('\0', "hugetlbfs", &hugetlbfs_path, "path", "Hugetlbfs path"),
>>
>> OPT_GROUP("Kernel options:"),
>> OPT_STRING('k', "kernel", &kernel_filename, "kernel",
>> @@ -808,7 +810,7 @@ int kvm_cmd_run(int argc, const char **argv, const char *prefix)
>> guest_name = default_name;
>> }
>>
>> - kvm = kvm__init(dev, ram_size, guest_name);
>> + kvm = kvm__init(dev, hugetlbfs_path, ram_size, guest_name);
>>
>> kvm->single_step = single_step;
>>
>> diff --git a/tools/kvm/include/kvm/kvm.h b/tools/kvm/include/kvm/kvm.h
>> index 5fe6e75..7159952 100644
>> --- a/tools/kvm/include/kvm/kvm.h
>> +++ b/tools/kvm/include/kvm/kvm.h
>> @@ -30,7 +30,7 @@ struct kvm_ext {
>> void kvm__set_dir(const char *fmt, ...);
>> const char *kvm__get_dir(void);
>>
>> -struct kvm *kvm__init(const char *kvm_dev, u64 ram_size, const char *name);
>> +struct kvm *kvm__init(const char *kvm_dev, const char *hugetlbfs_path, u64 ram_size, const char *name);
>> int kvm__recommended_cpus(struct kvm *kvm);
>> int kvm__max_cpus(struct kvm *kvm);
>> void kvm__init_ram(struct kvm *kvm);
>> @@ -54,7 +54,7 @@ int kvm__enumerate_instances(int (*callback)(const char *name, int pid));
>> void kvm__remove_socket(const char *name);
>>
>> void kvm__arch_set_cmdline(char *cmdline, bool video);
>> -void kvm__arch_init(struct kvm *kvm, const char *kvm_dev, u64 ram_size, const char *name);
>> +void kvm__arch_init(struct kvm *kvm, const char *kvm_dev, const char *hugetlbfs_path, u64 ram_size, const char *name);
>> void kvm__arch_setup_firmware(struct kvm *kvm);
>> bool kvm__arch_cpu_supports_vm(void);
>> void kvm__arch_periodic_poll(struct kvm *kvm);
>> diff --git a/tools/kvm/kvm.c b/tools/kvm/kvm.c
>> index 6f33e1a..503ceae 100644
>> --- a/tools/kvm/kvm.c
>> +++ b/tools/kvm/kvm.c
>> @@ -272,7 +272,7 @@ static void kvm__pid(int fd, u32 type, u32 len, u8 *msg)
>> pr_warning("Failed sending PID");
>> }
>>
>> -struct kvm *kvm__init(const char *kvm_dev, u64 ram_size, const char *name)
>> +struct kvm *kvm__init(const char *kvm_dev, const char *hugetlbfs_path, u64 ram_size, const char *name)
>> {
>> struct kvm *kvm;
>> int ret;
>> @@ -305,7 +305,7 @@ struct kvm *kvm__init(const char *kvm_dev, u64 ram_size, const char *name)
>> if (kvm__check_extensions(kvm))
>> die("A required KVM extention is not supported by OS");
>>
>> - kvm__arch_init(kvm, kvm_dev, ram_size, name);
>> + kvm__arch_init(kvm, kvm_dev, hugetlbfs_path, ram_size, name);
>>
>> kvm->name = name;
>>
>> diff --git a/tools/kvm/x86/kvm.c b/tools/kvm/x86/kvm.c
>> index 4ac21c0..76f805f 100644
>> --- a/tools/kvm/x86/kvm.c
>> +++ b/tools/kvm/x86/kvm.c
>> @@ -161,7 +161,7 @@ void kvm__arch_set_cmdline(char *cmdline, bool video)
>> }
>>
>> /* Architecture-specific KVM init */
>> -void kvm__arch_init(struct kvm *kvm, const char *kvm_dev, u64 ram_size, const char *name)
>> +void kvm__arch_init(struct kvm *kvm, const char *kvm_dev, const char *hugetlbfs_path, u64 ram_size, const char *name)
>> {
>> struct kvm_pit_config pit_config = { .flags = 0, };
>> int ret;
>> --
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>