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s390: uv: Fix sysfs max number of VCPUs reporting

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The number reported by the query is N-1 and I think people reading the
sysfs file would expect N instead. For users creating VMs there's no
actual difference because KVM's limit is currently below the UV's
limit.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Fixes: a0f60f8431 ("s390/protvirt: Add sysfs firmware interface for Ultravisor information")
Cc: stable@vger.kernel.org
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Acked-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Janosch Frank 2021-01-13 11:56:26 -05:00 committed by Vasily Gorbik
parent 6c12a6384e
commit e82080e1f4
3 changed files with 4 additions and 4 deletions
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2
arch/s390/boot/uv.c
View file

@ -35,7 +35,7 @@ void uv_query_info(void)
uv_info.guest_cpu_stor_len = uvcb.cpu_stor_len;
uv_info.max_sec_stor_addr = ALIGN(uvcb.max_guest_stor_addr, PAGE_SIZE);
uv_info.max_num_sec_conf = uvcb.max_num_sec_conf;
uv_info.max_guest_cpus = uvcb.max_guest_cpus;
uv_info.max_guest_cpu_id = uvcb.max_guest_cpu_id;
}
#ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST

4
arch/s390/include/asm/uv.h
View file

@ -96,7 +96,7 @@ struct uv_cb_qui {
u32 max_num_sec_conf;
u64 max_guest_stor_addr;
u8 reserved88[158 - 136];
u16 max_guest_cpus;
u16 max_guest_cpu_id;
u8 reserveda0[200 - 160];
} __packed __aligned(8);
@ -273,7 +273,7 @@ struct uv_info {
unsigned long guest_cpu_stor_len;
unsigned long max_sec_stor_addr;
unsigned int max_num_sec_conf;
unsigned short max_guest_cpus;
unsigned short max_guest_cpu_id;
};
extern struct uv_info uv_info;

2
arch/s390/kernel/uv.c
View file

@ -368,7 +368,7 @@ static ssize_t uv_query_max_guest_cpus(struct kobject *kobj,
struct kobj_attribute *attr, char *page)
{
return scnprintf(page, PAGE_SIZE, "%d\n",
uv_info.max_guest_cpus);
uv_info.max_guest_cpu_id + 1);
}
static struct kobj_attribute uv_query_max_guest_cpus_attr =