From: Andrew Cooper <andrew.cooper3@citrix.com>
To: Xen-devel <xen-devel@lists.xenproject.org>
Cc: "Andrew Cooper" <andrew.cooper3@citrix.com>,
"Wei Liu" <wl@xen.org>, "Jan Beulich" <JBeulich@suse.com>,
"Roger Pau Monné" <roger.pau@citrix.com>
Subject: [Xen-devel] [PATCH 4/4] xen: Introduce a xmemdup_bytes() helper
Date: Fri, 20 Mar 2020 21:24:52 +0000 [thread overview]
Message-ID: <20200320212453.21685-5-andrew.cooper3@citrix.com> (raw)
In-Reply-To: <20200320212453.21685-1-andrew.cooper3@citrix.com>
Use it to simplify the x86 microcode logic, taking the opportunity to drop the
-ENOMEM printks.
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
---
CC: Jan Beulich <JBeulich@suse.com>
CC: Wei Liu <wl@xen.org>
CC: Roger Pau Monné <roger.pau@citrix.com>
---
xen/arch/x86/cpu/microcode/amd.c | 9 ++-------
xen/arch/x86/cpu/microcode/intel.c | 7 ++-----
xen/include/xen/xmalloc.h | 11 +++++++++++
3 files changed, 15 insertions(+), 12 deletions(-)
diff --git a/xen/arch/x86/cpu/microcode/amd.c b/xen/arch/x86/cpu/microcode/amd.c
index 0998a36b5c..12a3b6b32c 100644
--- a/xen/arch/x86/cpu/microcode/amd.c
+++ b/xen/arch/x86/cpu/microcode/amd.c
@@ -299,11 +299,10 @@ static int get_ucode_from_buffer_amd(
return -EINVAL;
}
- mc_amd->mpb = xmalloc_bytes(mpbuf->len);
+ mc_amd->mpb = xmemdup_bytes(mpbuf->data, mpbuf->len);
if ( !mc_amd->mpb )
return -ENOMEM;
mc_amd->mpb_size = mpbuf->len;
- memcpy(mc_amd->mpb, mpbuf->data, mpbuf->len);
pr_debug("microcode: CPU%d size %zu, block size %u offset %zu equivID %#x rev %#x\n",
smp_processor_id(), bufsize, mpbuf->len, *offset,
@@ -336,14 +335,10 @@ static int install_equiv_cpu_table(
return -EINVAL;
}
- mc_amd->equiv_cpu_table = xmalloc_bytes(mpbuf->len);
+ mc_amd->equiv_cpu_table = xmemdup_bytes(mpbuf->data, mpbuf->len);
if ( !mc_amd->equiv_cpu_table )
- {
- printk(KERN_ERR "microcode: Cannot allocate memory for equivalent cpu table\n");
return -ENOMEM;
- }
- memcpy(mc_amd->equiv_cpu_table, mpbuf->data, mpbuf->len);
mc_amd->equiv_cpu_table_size = mpbuf->len;
return 0;
diff --git a/xen/arch/x86/cpu/microcode/intel.c b/xen/arch/x86/cpu/microcode/intel.c
index 6ac5f98694..f26511da98 100644
--- a/xen/arch/x86/cpu/microcode/intel.c
+++ b/xen/arch/x86/cpu/microcode/intel.c
@@ -339,13 +339,10 @@ static long get_next_ucode_from_buffer(struct microcode_intel **mc,
return -EINVAL;
}
- *mc = xmalloc_bytes(total_size);
+ *mc = xmemdup_bytes(mc_header, total_size);
if ( *mc == NULL )
- {
- printk(KERN_ERR "microcode: error! Can not allocate memory\n");
return -ENOMEM;
- }
- memcpy(*mc, (const void *)(buf + offset), total_size);
+
return offset + total_size;
}
diff --git a/xen/include/xen/xmalloc.h b/xen/include/xen/xmalloc.h
index f515ceee2a..16979a117c 100644
--- a/xen/include/xen/xmalloc.h
+++ b/xen/include/xen/xmalloc.h
@@ -51,6 +51,17 @@
#define xmalloc_bytes(_bytes) _xmalloc(_bytes, SMP_CACHE_BYTES)
#define xzalloc_bytes(_bytes) _xzalloc(_bytes, SMP_CACHE_BYTES)
+/* Allocate untyped storage and copying an existing instance. */
+#define xmemdup_bytes(_src, _nr) \
+ ({ \
+ unsigned long nr_ = (_nr); \
+ void *dst_ = xmalloc_bytes(nr_); \
+ \
+ if ( dst_ ) \
+ memcpy(dst_, _src, nr_); \
+ dst_; \
+ })
+
/* Free any of the above. */
extern void xfree(void *);
--
2.11.0
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next prev parent reply other threads:[~2020-03-20 21:25 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-20 21:24 [Xen-devel] [PATCH 0/4] x86/ucode: Cleanup - Part 2/n Andrew Cooper
2020-03-20 21:24 ` [Xen-devel] [PATCH 1/4] x86/ucode/amd: Fix assertion in compare_patch() Andrew Cooper
2020-03-21 16:45 ` Wei Liu
2020-03-20 21:24 ` [Xen-devel] [PATCH 2/4] x86/ucode: Fix error paths in apply_microcode() Andrew Cooper
2020-03-21 16:49 ` Wei Liu
2020-03-23 8:32 ` Jan Beulich
2020-03-20 21:24 ` [Xen-devel] [PATCH 3/4] xen: Drop raw_smp_processor_id() Andrew Cooper
2020-03-21 10:14 ` Julien Grall
2020-03-21 16:50 ` Wei Liu
2020-03-20 21:24 ` Andrew Cooper [this message]
2020-03-21 16:51 ` [Xen-devel] [PATCH 4/4] xen: Introduce a xmemdup_bytes() helper Wei Liu
2020-03-21 22:19 ` Julien Grall
2020-03-23 8:38 ` Jan Beulich
2020-03-26 15:38 ` Andrew Cooper
2020-03-26 15:47 ` Jan Beulich
2020-03-26 14:53 ` Andrew Cooper
2020-03-26 19:05 ` Julien Grall
2020-03-23 8:41 ` [Xen-devel] [PATCH 0/4] x86/ucode: Cleanup - Part 2/n Jan Beulich
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