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Date: Thu, 19 Nov 2015 10:34:07 +0100
From: Paolo Bonzini <pbonzini@...hat.com>
To: Borislav Petkov <bp@...en8.de>
Cc: LKML <linux-kernel@...r.kernel.org>, X86 ML <x86@...nel.org>,
KVM <kvm@...r.kernel.org>
Subject: Re: [RFC PATCH 1/3] x86/cpu: Unify CPU family, model, stepping
calculation
On 18/11/2015 19:50, Borislav Petkov wrote:
> On Wed, Nov 18, 2015 at 12:35:24PM +0100, Paolo Bonzini wrote:
>> Yes, exactly. I'm suggesting that the same applies to x86_vendor(). I
>> also prefer x86_cpuid_* to x86_*_cpuid because, once you add two
>> functions in the same family it's nice that they share a prefix.
>
> Ok, makes sense:
>
> ---
> commit 804437270083a1aabf87f65f65b32e2ae23121b6
> Author: Borislav Petkov <bp@...e.de>
> Date: Sat Nov 14 10:54:22 2015 +0100
>
> x86/cpu: Unify CPU family, model, stepping calculation
>
> Add generic functions which calc family, model and stepping from the
> CPUID_1.EAX leaf and stick them into the library we have.
>
> Rename those which do call CPUID with the prefix "x86_cpuid" as
> suggested by Paolo Bonzini.
>
> No functionality change.
>
> Signed-off-by: Borislav Petkov <bp@...e.de>
Reviewed-by: Paolo Bonzini <pbonzini@...hat.com>
Let me know if I should include this patch via the KVM tree. Do you
want it in 4.4?
Paolo
> diff --git a/arch/x86/include/asm/cpu.h b/arch/x86/include/asm/cpu.h
> index bf2caa1dedc5..678637ad7476 100644
> --- a/arch/x86/include/asm/cpu.h
> +++ b/arch/x86/include/asm/cpu.h
> @@ -36,4 +36,7 @@ extern int _debug_hotplug_cpu(int cpu, int action);
>
> int mwait_usable(const struct cpuinfo_x86 *);
>
> +unsigned int x86_family(unsigned int sig);
> +unsigned int x86_model(unsigned int sig);
> +unsigned int x86_stepping(unsigned int sig);
> #endif /* _ASM_X86_CPU_H */
> diff --git a/arch/x86/include/asm/microcode.h b/arch/x86/include/asm/microcode.h
> index 34e62b1dcfce..1e1b07a5a738 100644
> --- a/arch/x86/include/asm/microcode.h
> +++ b/arch/x86/include/asm/microcode.h
> @@ -1,6 +1,7 @@
> #ifndef _ASM_X86_MICROCODE_H
> #define _ASM_X86_MICROCODE_H
>
> +#include <asm/cpu.h>
> #include <linux/earlycpio.h>
>
> #define native_rdmsr(msr, val1, val2) \
> @@ -95,14 +96,14 @@ static inline void __exit exit_amd_microcode(void) {}
>
> /*
> * In early loading microcode phase on BSP, boot_cpu_data is not set up yet.
> - * x86_vendor() gets vendor id for BSP.
> + * x86_cpuid_vendor() gets vendor id for BSP.
> *
> * In 32 bit AP case, accessing boot_cpu_data needs linear address. To simplify
> - * coding, we still use x86_vendor() to get vendor id for AP.
> + * coding, we still use x86_cpuid_vendor() to get vendor id for AP.
> *
> - * x86_vendor() gets vendor information directly from CPUID.
> + * x86_cpuid_vendor() gets vendor information directly from CPUID.
> */
> -static inline int x86_vendor(void)
> +static inline int x86_cpuid_vendor(void)
> {
> u32 eax = 0x00000000;
> u32 ebx, ecx = 0, edx;
> @@ -118,40 +119,14 @@ static inline int x86_vendor(void)
> return X86_VENDOR_UNKNOWN;
> }
>
> -static inline unsigned int __x86_family(unsigned int sig)
> -{
> - unsigned int x86;
> -
> - x86 = (sig >> 8) & 0xf;
> -
> - if (x86 == 0xf)
> - x86 += (sig >> 20) & 0xff;
> -
> - return x86;
> -}
> -
> -static inline unsigned int x86_family(void)
> +static inline unsigned int x86_cpuid_family(void)
> {
> u32 eax = 0x00000001;
> u32 ebx, ecx = 0, edx;
>
> native_cpuid(&eax, &ebx, &ecx, &edx);
>
> - return __x86_family(eax);
> -}
> -
> -static inline unsigned int x86_model(unsigned int sig)
> -{
> - unsigned int x86, model;
> -
> - x86 = __x86_family(sig);
> -
> - model = (sig >> 4) & 0xf;
> -
> - if (x86 == 0x6 || x86 == 0xf)
> - model += ((sig >> 16) & 0xf) << 4;
> -
> - return model;
> + return x86_family(eax);
> }
>
> #ifdef CONFIG_MICROCODE
> diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
> index 4ddd780aeac9..c311b51efe15 100644
> --- a/arch/x86/kernel/cpu/common.c
> +++ b/arch/x86/kernel/cpu/common.c
> @@ -582,14 +582,9 @@ void cpu_detect(struct cpuinfo_x86 *c)
> u32 junk, tfms, cap0, misc;
>
> cpuid(0x00000001, &tfms, &misc, &junk, &cap0);
> - c->x86 = (tfms >> 8) & 0xf;
> - c->x86_model = (tfms >> 4) & 0xf;
> - c->x86_mask = tfms & 0xf;
> -
> - if (c->x86 == 0xf)
> - c->x86 += (tfms >> 20) & 0xff;
> - if (c->x86 >= 0x6)
> - c->x86_model += ((tfms >> 16) & 0xf) << 4;
> + c->x86 = x86_family(tfms);
> + c->x86_model = x86_model(tfms);
> + c->x86_mask = x86_stepping(tfms);
>
> if (cap0 & (1<<19)) {
> c->x86_clflush_size = ((misc >> 8) & 0xff) * 8;
> diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c
> index 7fc27f1cca58..3aaffb601c91 100644
> --- a/arch/x86/kernel/cpu/microcode/core.c
> +++ b/arch/x86/kernel/cpu/microcode/core.c
> @@ -129,8 +129,8 @@ void __init load_ucode_bsp(void)
> if (!have_cpuid_p())
> return;
>
> - vendor = x86_vendor();
> - family = x86_family();
> + vendor = x86_cpuid_vendor();
> + family = x86_cpuid_family();
>
> switch (vendor) {
> case X86_VENDOR_INTEL:
> @@ -165,8 +165,8 @@ void load_ucode_ap(void)
> if (!have_cpuid_p())
> return;
>
> - vendor = x86_vendor();
> - family = x86_family();
> + vendor = x86_cpuid_vendor();
> + family = x86_cpuid_family();
>
> switch (vendor) {
> case X86_VENDOR_INTEL:
> @@ -206,8 +206,8 @@ void reload_early_microcode(void)
> {
> int vendor, family;
>
> - vendor = x86_vendor();
> - family = x86_family();
> + vendor = x86_cpuid_vendor();
> + family = x86_cpuid_family();
>
> switch (vendor) {
> case X86_VENDOR_INTEL:
> diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
> index ce47402eb2f9..ee81c544ee0d 100644
> --- a/arch/x86/kernel/cpu/microcode/intel.c
> +++ b/arch/x86/kernel/cpu/microcode/intel.c
> @@ -145,10 +145,10 @@ matching_model_microcode(struct microcode_header_intel *mc_header,
> int ext_sigcount, i;
> struct extended_signature *ext_sig;
>
> - fam = __x86_family(sig);
> + fam = x86_family(sig);
> model = x86_model(sig);
>
> - fam_ucode = __x86_family(mc_header->sig);
> + fam_ucode = x86_family(mc_header->sig);
> model_ucode = x86_model(mc_header->sig);
>
> if (fam == fam_ucode && model == model_ucode)
> @@ -163,7 +163,7 @@ matching_model_microcode(struct microcode_header_intel *mc_header,
> ext_sigcount = ext_header->count;
>
> for (i = 0; i < ext_sigcount; i++) {
> - fam_ucode = __x86_family(ext_sig->sig);
> + fam_ucode = x86_family(ext_sig->sig);
> model_ucode = x86_model(ext_sig->sig);
>
> if (fam == fam_ucode && model == model_ucode)
> @@ -365,7 +365,7 @@ static int collect_cpu_info_early(struct ucode_cpu_info *uci)
> native_cpuid(&eax, &ebx, &ecx, &edx);
> csig.sig = eax;
>
> - family = __x86_family(csig.sig);
> + family = x86_family(csig.sig);
> model = x86_model(csig.sig);
>
> if ((model >= 5) || (family > 6)) {
> @@ -521,16 +521,12 @@ static bool __init load_builtin_intel_microcode(struct cpio_data *cp)
> {
> #ifdef CONFIG_X86_64
> unsigned int eax = 0x00000001, ebx, ecx = 0, edx;
> - unsigned int family, model, stepping;
> char name[30];
>
> native_cpuid(&eax, &ebx, &ecx, &edx);
>
> - family = __x86_family(eax);
> - model = x86_model(eax);
> - stepping = eax & 0xf;
> -
> - sprintf(name, "intel-ucode/%02x-%02x-%02x", family, model, stepping);
> + sprintf(name, "intel-ucode/%02x-%02x-%02x",
> + x86_family(eax), x86_model(eax), x86_stepping(eax));
>
> return get_builtin_firmware(cp, name);
> #else
> diff --git a/arch/x86/lib/Makefile b/arch/x86/lib/Makefile
> index f2587888d987..a501fa25da41 100644
> --- a/arch/x86/lib/Makefile
> +++ b/arch/x86/lib/Makefile
> @@ -16,7 +16,7 @@ clean-files := inat-tables.c
>
> obj-$(CONFIG_SMP) += msr-smp.o cache-smp.o
>
> -lib-y := delay.o misc.o cmdline.o
> +lib-y := delay.o misc.o cmdline.o cpu.o
> lib-y += usercopy_$(BITS).o usercopy.o getuser.o putuser.o
> lib-y += memcpy_$(BITS).o
> lib-$(CONFIG_RWSEM_XCHGADD_ALGORITHM) += rwsem.o
> diff --git a/arch/x86/lib/cpu.c b/arch/x86/lib/cpu.c
> new file mode 100644
> index 000000000000..aa417a97511c
> --- /dev/null
> +++ b/arch/x86/lib/cpu.c
> @@ -0,0 +1,35 @@
> +#include <linux/module.h>
> +
> +unsigned int x86_family(unsigned int sig)
> +{
> + unsigned int x86;
> +
> + x86 = (sig >> 8) & 0xf;
> +
> + if (x86 == 0xf)
> + x86 += (sig >> 20) & 0xff;
> +
> + return x86;
> +}
> +EXPORT_SYMBOL_GPL(x86_family);
> +
> +unsigned int x86_model(unsigned int sig)
> +{
> + unsigned int fam, model;
> +
> + fam = x86_family(sig);
> +
> + model = (sig >> 4) & 0xf;
> +
> + if (fam >= 0x6)
> + model += ((sig >> 16) & 0xf) << 4;
> +
> + return model;
> +}
> +EXPORT_SYMBOL_GPL(x86_model);
> +
> +unsigned int x86_stepping(unsigned int sig)
> +{
> + return sig & 0xf;
> +}
> +EXPORT_SYMBOL_GPL(x86_stepping);
>
--
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