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x86/cpufeatures: Combine word 11 and 12 into a new scattered features word

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It's a waste for the four X86_FEATURE_CQM_* feature bits to occupy two
whole feature bits words. To better utilize feature words, re-define
word 11 to host scattered features and move the four X86_FEATURE_CQM_*
features into Linux defined word 11. More scattered features can be
added in word 11 in the future.

Rename leaf 11 in cpuid_leafs to CPUID_LNX_4 to reflect it's a
Linux-defined leaf.

Rename leaf 12 as CPUID_DUMMY which will be replaced by a meaningful
name in the next patch when CPUID.7.1:EAX occupies world 12.

Maximum number of RMID and cache occupancy scale are retrieved from
CPUID.0xf.1 after scattered CQM features are enumerated. Carve out the
code into a separate function.

KVM doesn't support resctrl now. So it's safe to move the
X86_FEATURE_CQM_* features to scattered features word 11 for KVM.

Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Aaron Lewis <aaronlewis@google.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Babu Moger <babu.moger@amd.com>
Cc: "Chang S. Bae" <chang.seok.bae@intel.com>
Cc: "Sean J Christopherson" <sean.j.christopherson@intel.com>
Cc: Frederic Weisbecker <frederic@kernel.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jann Horn <jannh@google.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: kvm ML <kvm@vger.kernel.org>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Nadav Amit <namit@vmware.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Pavel Tatashin <pasha.tatashin@oracle.com>
Cc: Peter Feiner <pfeiner@google.com>
Cc: "Peter Zijlstra (Intel)" <peterz@infradead.org>
Cc: "Radim Krčmář" <rkrcmar@redhat.com>
Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Cc: Ravi V Shankar <ravi.v.shankar@intel.com>
Cc: Sherry Hurwitz <sherry.hurwitz@amd.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Thomas Lendacky <Thomas.Lendacky@amd.com>
Cc: x86 <x86@kernel.org>
Link: https://lkml.kernel.org/r/1560794416-217638-2-git-send-email-fenghua.yu@intel.com
This commit is contained in:
Fenghua Yu
2019-06-19 18:51:09 +02:00
committed by Borislav Petkov
parent 45fc56e629
commit acec0ce081
6 changed files with 34 additions and 34 deletions
Download Patch File Download Diff File Expand all files Collapse all files

38
arch/x86/kernel/cpu/common.c
View File

@@ -803,33 +803,25 @@ static void init_speculation_control(struct cpuinfo_x86 *c)
static void init_cqm(struct cpuinfo_x86 *c)
{
u32 eax, ebx, ecx, edx;
if (!cpu_has(c, X86_FEATURE_CQM_LLC)) {
c->x86_cache_max_rmid = -1;
c->x86_cache_occ_scale = -1;
return;
}
/* Additional Intel-defined flags: level 0x0000000F */
if (c->cpuid_level >= 0x0000000F) {
/* will be overridden if occupancy monitoring exists */
c->x86_cache_max_rmid = cpuid_ebx(0xf);
/* QoS sub-leaf, EAX=0Fh, ECX=0 */
cpuid_count(0x0000000F, 0, &eax, &ebx, &ecx, &edx);
c->x86_capability[CPUID_F_0_EDX] = edx;
if (cpu_has(c, X86_FEATURE_CQM_OCCUP_LLC) ||
cpu_has(c, X86_FEATURE_CQM_MBM_TOTAL) ||
cpu_has(c, X86_FEATURE_CQM_MBM_LOCAL)) {
u32 eax, ebx, ecx, edx;
if (cpu_has(c, X86_FEATURE_CQM_LLC)) {
/* will be overridden if occupancy monitoring exists */
c->x86_cache_max_rmid = ebx;
/* QoS sub-leaf, EAX=0Fh, ECX=1 */
cpuid_count(0xf, 1, &eax, &ebx, &ecx, &edx);
/* QoS sub-leaf, EAX=0Fh, ECX=1 */
cpuid_count(0x0000000F, 1, &eax, &ebx, &ecx, &edx);
c->x86_capability[CPUID_F_1_EDX] = edx;
if ((cpu_has(c, X86_FEATURE_CQM_OCCUP_LLC)) ||
((cpu_has(c, X86_FEATURE_CQM_MBM_TOTAL)) ||
(cpu_has(c, X86_FEATURE_CQM_MBM_LOCAL)))) {
c->x86_cache_max_rmid = ecx;
c->x86_cache_occ_scale = ebx;
}
} else {
c->x86_cache_max_rmid = -1;
c->x86_cache_occ_scale = -1;
}
c->x86_cache_max_rmid = ecx;
c->x86_cache_occ_scale = ebx;
}
}