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From: Chao Gao <chao.gao@intel.com>
To: xen-devel@lists.xenproject.org
Cc: "Ashok Raj" <ashok.raj@intel.com>, "Wei Liu" <wl@xen.org>,
	"Andrew Cooper" <andrew.cooper3@citrix.com>,
	"Jan Beulich" <jbeulich@suse.com>,
	"Chao Gao" <chao.gao@intel.com>,
	"Roger Pau Monné" <roger.pau@citrix.com>
Subject: [Xen-devel] [PATCH v9 01/15] microcode/intel: extend microcode_update_match()
Date: Mon, 19 Aug 2019 09:25:14 +0800
Message-ID: <1566177928-19114-2-git-send-email-chao.gao@intel.com> (raw)
In-Reply-To: <1566177928-19114-1-git-send-email-chao.gao@intel.com>

to a more generic function. So that it can be used alone to check
an update against the CPU signature and current update revision.

Note that enum microcode_match_result will be used in common code
(aka microcode.c), it has been placed in the common header.

Signed-off-by: Chao Gao <chao.gao@intel.com>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
---
Changes in v9:
 - microcode_update_match() doesn't accept (sig, pf, rev) any longer.
 Hence, it won't be used to compare two arbitrary updates.
 - rewrite patch description

Changes in v8:
 - make sure enough room for an extended header and signature array

Changes in v6:
 - eliminate unnecessary type casting in microcode_update_match
 - check if a patch has an extend header

Changes in v5:
 - constify the extended_signature
 - use named enum type for the return value of microcode_update_match
---
 xen/arch/x86/microcode_intel.c  | 60 ++++++++++++++++++++++-------------------
 xen/include/asm-x86/microcode.h |  6 +++++
 2 files changed, 39 insertions(+), 27 deletions(-)

diff --git a/xen/arch/x86/microcode_intel.c b/xen/arch/x86/microcode_intel.c
index 22fdeca..c185b5c 100644
--- a/xen/arch/x86/microcode_intel.c
+++ b/xen/arch/x86/microcode_intel.c
@@ -134,14 +134,39 @@ static int collect_cpu_info(unsigned int cpu_num, struct cpu_signature *csig)
     return 0;
 }
 
-static inline int microcode_update_match(
-    unsigned int cpu_num, const struct microcode_header_intel *mc_header,
-    int sig, int pf)
+/* Check an update against the CPU signature and current update revision */
+static enum microcode_match_result microcode_update_match(
+    const struct microcode_header_intel *mc_header, unsigned int cpu)
 {
-    struct ucode_cpu_info *uci = &per_cpu(ucode_cpu_info, cpu_num);
-
-    return (sigmatch(sig, uci->cpu_sig.sig, pf, uci->cpu_sig.pf) &&
-            (mc_header->rev > uci->cpu_sig.rev));
+    const struct extended_sigtable *ext_header;
+    const struct extended_signature *ext_sig;
+    unsigned int i;
+    struct ucode_cpu_info *uci = &per_cpu(ucode_cpu_info, cpu);
+    unsigned int sig = uci->cpu_sig.sig;
+    unsigned int pf = uci->cpu_sig.pf;
+    unsigned int rev = uci->cpu_sig.rev;
+    unsigned long data_size = get_datasize(mc_header);
+    const void *end = (const void *)mc_header + get_totalsize(mc_header);
+
+    if ( sigmatch(sig, mc_header->sig, pf, mc_header->pf) )
+        return (mc_header->rev > rev) ? NEW_UCODE : OLD_UCODE;
+
+    ext_header = (const void *)(mc_header + 1) + data_size;
+    ext_sig = (const void *)(ext_header + 1);
+
+    /*
+     * Make sure there is enough space to hold an extended header and enough
+     * array elements.
+     */
+    if ( (end < (const void *)ext_sig) ||
+         (end < (const void *)(ext_sig + ext_header->count)) )
+        return MIS_UCODE;
+
+    for ( i = 0; i < ext_header->count; i++ )
+        if ( sigmatch(sig, ext_sig[i].sig, pf, ext_sig[i].pf) )
+            return (mc_header->rev > rev) ? NEW_UCODE : OLD_UCODE;
+
+    return MIS_UCODE;
 }
 
 static int microcode_sanity_check(void *mc)
@@ -243,31 +268,12 @@ static int get_matching_microcode(const void *mc, unsigned int cpu)
 {
     struct ucode_cpu_info *uci = &per_cpu(ucode_cpu_info, cpu);
     const struct microcode_header_intel *mc_header = mc;
-    const struct extended_sigtable *ext_header;
     unsigned long total_size = get_totalsize(mc_header);
-    int ext_sigcount, i;
-    struct extended_signature *ext_sig;
     void *new_mc;
 
-    if ( microcode_update_match(cpu, mc_header,
-                                mc_header->sig, mc_header->pf) )
-        goto find;
-
-    if ( total_size <= (get_datasize(mc_header) + MC_HEADER_SIZE) )
+    if ( microcode_update_match(mc, cpu) != NEW_UCODE )
         return 0;
 
-    ext_header = mc + get_datasize(mc_header) + MC_HEADER_SIZE;
-    ext_sigcount = ext_header->count;
-    ext_sig = (void *)ext_header + EXT_HEADER_SIZE;
-    for ( i = 0; i < ext_sigcount; i++ )
-    {
-        if ( microcode_update_match(cpu, mc_header,
-                                    ext_sig->sig, ext_sig->pf) )
-            goto find;
-        ext_sig++;
-    }
-    return 0;
- find:
     pr_debug("microcode: CPU%d found a matching microcode update with"
              " version %#x (current=%#x)\n",
              cpu, mc_header->rev, uci->cpu_sig.rev);
diff --git a/xen/include/asm-x86/microcode.h b/xen/include/asm-x86/microcode.h
index 23ea954..882f560 100644
--- a/xen/include/asm-x86/microcode.h
+++ b/xen/include/asm-x86/microcode.h
@@ -3,6 +3,12 @@
 
 #include <xen/percpu.h>
 
+enum microcode_match_result {
+    OLD_UCODE, /* signature matched, but revision id is older or equal */
+    NEW_UCODE, /* signature matched, but revision id is newer */
+    MIS_UCODE, /* signature mismatched */
+};
+
 struct cpu_signature;
 struct ucode_cpu_info;
 
-- 
1.8.3.1


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  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 ` Chao Gao [this message]
2019-08-28 15:12   ` [Xen-devel] [PATCH v9 01/15] microcode/intel: extend microcode_update_match() 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
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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