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From: Jan Beulich <jbeulich@suse.com>
To: Chao Gao <chao.gao@intel.com>
Cc: xen-devel@lists.xenproject.org,
	"Roger Pau Monné" <roger.pau@citrix.com>,
	"Ashok Raj" <ashok.raj@intel.com>, "Wei Liu" <wl@xen.org>,
	"Andrew Cooper" <andrew.cooper3@citrix.com>
Subject: Re: [Xen-devel] [PATCH v9 10/15] microcode: split out apply_microcode() from cpu_request_microcode()
Date: Thu, 29 Aug 2019 12:19:32 +0200
Message-ID: <86fbb756-85ce-5def-87bc-6a90cce22018@suse.com> (raw)
In-Reply-To: <1566177928-19114-11-git-send-email-chao.gao@intel.com>

On 19.08.2019 03:25, Chao Gao wrote:
> @@ -300,32 +322,44 @@ int microcode_update(XEN_GUEST_HANDLE_PARAM(const_void) buf, unsigned long len)
>      if ( microcode_ops == NULL )
>          return -EINVAL;
>  
> -    info = xmalloc_bytes(sizeof(*info) + len);
> -    if ( info == NULL )
> +    buffer = xmalloc_bytes(len);
> +    if ( !buffer )
>          return -ENOMEM;
>  
> -    ret = copy_from_guest(info->buffer, buf, len);
> -    if ( ret != 0 )
> +    if ( copy_from_guest(buffer, buf, len) )
>      {
> -        xfree(info);
> -        return ret;
> +        ret = -EFAULT;
> +        goto free;
>      }
>  
> -    info->buffer_size = len;
> -    info->error = 0;
> -    info->cpu = cpumask_first(&cpu_online_map);
> -
>      if ( microcode_ops->start_update )
>      {
>          ret = microcode_ops->start_update();
>          if ( ret != 0 )
> -        {
> -            xfree(info);
> -            return ret;
> -        }
> +            goto free;
>      }
>  
> -    return continue_hypercall_on_cpu(info->cpu, do_microcode_update, info);
> +    patch = parse_blob(buffer, len);
> +    if ( IS_ERR(patch) )
> +    {
> +        ret = PTR_ERR(patch);
> +        printk(XENLOG_INFO "Parsing microcode blob error %d\n", ret);

I think this wants to be at least XENLOG_WARNING.

> @@ -372,23 +406,46 @@ int __init early_microcode_update_cpu(bool start_update)
>  
>      microcode_ops->collect_cpu_info(&this_cpu(cpu_sig));
>  
> -    if ( data )
> +    if ( !data )
> +        return -ENOMEM;
> +
> +    if ( start_update )
>      {
> -        if ( start_update && microcode_ops->start_update )
> +        struct microcode_patch *patch;
> +
> +        if ( microcode_ops->start_update )
>              rc = microcode_ops->start_update();
>  
>          if ( rc )
>              return rc;
>  
> -        rc = microcode_update_cpu(data, len);
> +        patch = parse_blob(data, len);
> +        if ( IS_ERR(patch) )
> +        {
> +            printk(XENLOG_INFO "Parsing microcode blob error %ld\n",

Same here.

> +                   PTR_ERR(patch));
> +            return PTR_ERR(patch);
> +        }
> +
> +        if ( !patch )
> +        {
> +            printk(XENLOG_INFO "No ucode found. Update aborted!\n");

Here I'm not sure the message is worthwhile to have.

> @@ -41,8 +42,6 @@ struct cpu_signature {
>  DECLARE_PER_CPU(struct cpu_signature, cpu_sig);
>  extern const struct microcode_ops *microcode_ops;
>  
> -const struct microcode_patch *microcode_get_cache(void);
> -bool microcode_update_cache(struct microcode_patch *patch);

If you remove the declaration but not the definition, then the
latter should become static.

Jan

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  parent reply index

Thread overview: 57+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-19  1:25 [Xen-devel] [PATCH v9 00/15] improve late microcode loading Chao Gao
2019-08-19  1:25 ` [Xen-devel] [PATCH v9 01/15] microcode/intel: extend microcode_update_match() Chao Gao
2019-08-28 15:12   ` Jan Beulich
2019-08-29  7:15     ` Chao Gao
2019-08-29  7:14       ` Jan Beulich
2019-08-19  1:25 ` [Xen-devel] [PATCH v9 02/15] microcode/amd: fix memory leak Chao Gao
2019-08-19  1:25 ` [Xen-devel] [PATCH v9 03/15] microcode/amd: distinguish old and mismatched ucode in microcode_fits() Chao Gao
2019-08-19  1:25 ` [Xen-devel] [PATCH v9 04/15] microcode: introduce a global cache of ucode patch Chao Gao
2019-08-22 11:11   ` Roger Pau Monné
2019-08-28 15:21   ` Jan Beulich
2019-08-29 10:18   ` Jan Beulich
2019-08-19  1:25 ` [Xen-devel] [PATCH v9 05/15] microcode: clean up microcode_resume_cpu Chao Gao
2019-08-19  1:25 ` [Xen-devel] [PATCH v9 06/15] microcode: remove struct ucode_cpu_info Chao Gao
2019-08-19  1:25 ` [Xen-devel] [PATCH v9 07/15] microcode: remove pointless 'cpu' parameter Chao Gao
2019-08-19  1:25 ` [Xen-devel] [PATCH v9 08/15] microcode/amd: call svm_host_osvw_init() in common code Chao Gao
2019-08-22 13:08   ` Roger Pau Monné
2019-08-28 15:26   ` Jan Beulich
2019-08-19  1:25 ` [Xen-devel] [PATCH v9 09/15] microcode: pass a patch pointer to apply_microcode() Chao Gao
2019-08-19  1:25 ` [Xen-devel] [PATCH v9 10/15] microcode: split out apply_microcode() from cpu_request_microcode() Chao Gao
2019-08-22 13:59   ` Roger Pau Monné
2019-08-29 10:06     ` Jan Beulich
2019-08-30  3:22       ` Chao Gao
2019-08-30  7:25         ` Jan Beulich
2019-08-29 10:19   ` Jan Beulich [this message]
2019-08-19  1:25 ` [Xen-devel] [PATCH v9 11/15] microcode: unify loading update during CPU resuming and AP wakeup Chao Gao
2019-08-22 14:10   ` Roger Pau Monné
2019-08-22 16:44     ` Chao Gao
2019-08-23  9:09       ` Roger Pau Monné
2019-08-29  7:37         ` Chao Gao
2019-08-29  8:16           ` Roger Pau Monné
2019-08-29 10:26           ` Jan Beulich
2019-08-29 10:29   ` Jan Beulich
2019-08-19  1:25 ` [Xen-devel] [PATCH v9 12/15] microcode: reduce memory allocation and copy when creating a patch Chao Gao
2019-08-23  8:11   ` Roger Pau Monné
2019-08-26  7:03     ` Chao Gao
2019-08-26  8:11       ` Roger Pau Monné
2019-08-29 10:47   ` Jan Beulich
2019-08-19  1:25 ` [Xen-devel] [PATCH v9 13/15] x86/microcode: Synchronize late microcode loading Chao Gao
2019-08-19 10:27   ` Sergey Dyasli
2019-08-19 14:49     ` Chao Gao
2019-08-29 12:06   ` Jan Beulich
2019-08-30  3:30     ` Chao Gao
2019-08-19  1:25 ` [Xen-devel] [PATCH v9 14/15] microcode: remove microcode_update_lock Chao Gao
2019-08-19  1:25 ` [Xen-devel] [PATCH v9 15/15] microcode: block #NMI handling when loading an ucode Chao Gao
2019-08-23  8:46   ` Sergey Dyasli
2019-08-26  8:07     ` Chao Gao
2019-08-27  4:52       ` Chao Gao
2019-08-28  8:52         ` Sergey Dyasli
2019-08-29 12:11         ` Jan Beulich
2019-08-30  6:35           ` Chao Gao
2019-09-09  5:52             ` Chao Gao
2019-09-09  6:16               ` Jan Beulich
2019-08-29 12:22   ` Jan Beulich
2019-08-30  6:33     ` Chao Gao
2019-08-30  7:30       ` Jan Beulich
2019-08-22  7:51 ` [Xen-devel] [PATCH v9 00/15] improve late microcode loading Sergey Dyasli
2019-08-22 15:39   ` Chao Gao

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