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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen staging] x86/cpuid: Drop get_cpu_vendor() completely
commit 00b4f4d0fb75dc183b499e78d1abcb865dbc30d7
Author: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Tue Jul 10 13:53:21 2018 +0100
Commit: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Wed Mar 27 14:45:47 2019 +0000
x86/cpuid: Drop get_cpu_vendor() completely
get_cpu_vendor() tries to do a number of things, and ends up doing none of
them well.
For calculating the vendor itself, use x86_cpuid_lookup_vendor() which is
implemented in a far more efficient manner than looping over cpu_devs[].
For setting up this_cpu, set it up once on the BSP only, rather than
latest-takes-precident across the APs. Such a system is probably not going
to
boot, but this feels like a less dangerous course of action. Adjust the
printed errors to be more clear in the mismatch case.
This removes the only user of cpu_dev->c_ident[], so drop that field as
well.
Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
xen/arch/x86/cpu/amd.c | 1 -
xen/arch/x86/cpu/centaur.c | 1 -
xen/arch/x86/cpu/common.c | 45 ++++++++++++-----------------------------
xen/arch/x86/cpu/cpu.h | 1 -
xen/arch/x86/cpu/intel.c | 1 -
xen/arch/x86/cpu/shanghai.c | 1 -
xen/arch/x86/cpuid.c | 4 ++--
xen/include/asm-x86/processor.h | 7 -------
8 files changed, 15 insertions(+), 46 deletions(-)
diff --git a/xen/arch/x86/cpu/amd.c b/xen/arch/x86/cpu/amd.c
index c790416f8d..7a73d62994 100644
--- a/xen/arch/x86/cpu/amd.c
+++ b/xen/arch/x86/cpu/amd.c
@@ -794,7 +794,6 @@ static void init_amd(struct cpuinfo_x86 *c)
static const struct cpu_dev amd_cpu_dev = {
.c_vendor = "AMD",
- .c_ident = { "AuthenticAMD" },
.c_early_init = early_init_amd,
.c_init = init_amd,
};
diff --git a/xen/arch/x86/cpu/centaur.c b/xen/arch/x86/cpu/centaur.c
index 1c760be40d..71f6503682 100644
--- a/xen/arch/x86/cpu/centaur.c
+++ b/xen/arch/x86/cpu/centaur.c
@@ -56,7 +56,6 @@ static void init_centaur(struct cpuinfo_x86 *c)
static const struct cpu_dev centaur_cpu_dev = {
.c_vendor = "Centaur",
- .c_ident = { "CentaurHauls" },
.c_init = init_centaur,
};
diff --git a/xen/arch/x86/cpu/common.c b/xen/arch/x86/cpu/common.c
index 53bb0a9e7c..b2249b5b12 100644
--- a/xen/arch/x86/cpu/common.c
+++ b/xen/arch/x86/cpu/common.c
@@ -247,36 +247,6 @@ void display_cacheinfo(struct cpuinfo_x86 *c)
l2size, ecx & 0xFF);
}
-int get_cpu_vendor(uint32_t b, uint32_t c, uint32_t d, enum get_cpu_vendor
mode)
-{
- int i;
- static int printed;
-
- for (i = 0; i < X86_VENDOR_NUM; i++) {
- if (cpu_devs[i]) {
- struct {
- uint32_t b, d, c;
- } *ptr = (void *)cpu_devs[i]->c_ident;
-
- if (ptr->b == b && ptr->c == c && ptr->d == d) {
- if (mode == gcv_host)
- this_cpu = cpu_devs[i];
- return i;
- }
- }
- }
- if (mode == gcv_guest)
- return X86_VENDOR_UNKNOWN;
- if (!printed) {
- printed++;
- printk(KERN_ERR "CPU: Vendor unknown, using generic init.\n");
- printk(KERN_ERR "CPU: Your system may be unstable.\n");
- }
- this_cpu = &default_cpu;
-
- return X86_VENDOR_UNKNOWN;
-}
-
static inline u32 _phys_pkg_id(u32 cpuid_apic, int index_msb)
{
return cpuid_apic >> index_msb;
@@ -313,7 +283,13 @@ static void __init early_cpu_detect(void)
*(u32 *)&c->x86_vendor_id[8] = ecx;
*(u32 *)&c->x86_vendor_id[4] = edx;
- c->x86_vendor = get_cpu_vendor(ebx, ecx, edx, gcv_host);
+ c->x86_vendor = x86_cpuid_lookup_vendor(ebx, ecx, edx);
+ if (c->x86_vendor < ARRAY_SIZE(cpu_devs) && cpu_devs[c->x86_vendor])
+ this_cpu = cpu_devs[c->x86_vendor];
+ else
+ printk(XENLOG_ERR
+ "Unrecognised or unsupported CPU vendor '%.12s'\n",
+ c->x86_vendor_id);
cpuid(0x00000001, &eax, &ebx, &ecx, &edx);
c->x86 = get_cpu_family(eax, &c->x86_model, &c->x86_mask);
@@ -361,7 +337,12 @@ static void generic_identify(struct cpuinfo_x86 *c)
*(u32 *)&c->x86_vendor_id[8] = ecx;
*(u32 *)&c->x86_vendor_id[4] = edx;
- c->x86_vendor = get_cpu_vendor(ebx, ecx, edx, gcv_host);
+ c->x86_vendor = x86_cpuid_lookup_vendor(ebx, ecx, edx);
+ if (boot_cpu_data.x86_vendor != c->x86_vendor)
+ printk(XENLOG_ERR "CPU%u vendor %u mismatch against BSP %u\n",
+ smp_processor_id(), c->x86_vendor,
+ boot_cpu_data.x86_vendor);
+
/* Initialize the standard set of capabilities */
/* Note that the vendor-specific code below might override */
diff --git a/xen/arch/x86/cpu/cpu.h b/xen/arch/x86/cpu/cpu.h
index 2fcb931388..edc88b1eab 100644
--- a/xen/arch/x86/cpu/cpu.h
+++ b/xen/arch/x86/cpu/cpu.h
@@ -1,7 +1,6 @@
/* attempt to consolidate cpu attributes */
struct cpu_dev {
char c_vendor[8];
- char c_ident[13];
void (*c_early_init)(struct cpuinfo_x86 *c);
void (*c_init)(struct cpuinfo_x86 * c);
diff --git a/xen/arch/x86/cpu/intel.c b/xen/arch/x86/cpu/intel.c
index 29c6b87512..f9c2ec439a 100644
--- a/xen/arch/x86/cpu/intel.c
+++ b/xen/arch/x86/cpu/intel.c
@@ -350,7 +350,6 @@ static void init_intel(struct cpuinfo_x86 *c)
static const struct cpu_dev intel_cpu_dev = {
.c_vendor = "Intel",
- .c_ident = { "GenuineIntel" },
.c_early_init = early_init_intel,
.c_init = init_intel,
};
diff --git a/xen/arch/x86/cpu/shanghai.c b/xen/arch/x86/cpu/shanghai.c
index 9156c850fe..24af5c8259 100644
--- a/xen/arch/x86/cpu/shanghai.c
+++ b/xen/arch/x86/cpu/shanghai.c
@@ -17,7 +17,6 @@ static void init_shanghai(struct cpuinfo_x86 *c)
static const struct cpu_dev shanghai_cpu_dev = {
.c_vendor = " Shang",
- .c_ident = {" Shanghai "},
.c_init = init_shanghai,
};
diff --git a/xen/arch/x86/cpuid.c b/xen/arch/x86/cpuid.c
index ab0aab678c..b5eb584a47 100644
--- a/xen/arch/x86/cpuid.c
+++ b/xen/arch/x86/cpuid.c
@@ -459,8 +459,8 @@ void recalculate_cpuid_policy(struct domain *d)
uint32_t fs[FSCAPINTS], max_fs[FSCAPINTS];
unsigned int i;
- p->x86_vendor = get_cpu_vendor(p->basic.vendor_ebx, p->basic.vendor_ecx,
- p->basic.vendor_edx, gcv_guest);
+ p->x86_vendor = x86_cpuid_lookup_vendor(
+ p->basic.vendor_ebx, p->basic.vendor_ecx, p->basic.vendor_edx);
p->basic.max_leaf = min(p->basic.max_leaf, max->basic.max_leaf);
p->feat.max_subleaf = min(p->feat.max_subleaf, max->feat.max_subleaf);
diff --git a/xen/include/asm-x86/processor.h b/xen/include/asm-x86/processor.h
index f3275ca5d3..cef3ffb8b0 100644
--- a/xen/include/asm-x86/processor.h
+++ b/xen/include/asm-x86/processor.h
@@ -579,13 +579,6 @@ int early_microcode_init(void);
int microcode_init_intel(void);
int microcode_init_amd(void);
-enum get_cpu_vendor {
- gcv_host,
- gcv_guest,
-};
-
-int get_cpu_vendor(uint32_t b, uint32_t c, uint32_t d, enum get_cpu_vendor
mode);
-
static inline uint8_t get_cpu_family(uint32_t raw, uint8_t *model,
uint8_t *stepping)
{
--
generated by git-patchbot for /home/xen/git/xen.git#staging
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