From: Fenghua Yu <fenghua.yu@intel.com>
To: "Thomas Gleixner" <tglx@linutronix.de>,
"Borislav Petkov" <bp@alien8.de>,
"Ingo Molnar" <mingo@redhat.com>, "H Peter Anvin" <hpa@zytor.com>,
"Andy Lutomirski" <luto@kernel.org>,
"Jean-Philippe Brucker" <jean-philippe@linaro.org>,
"Christoph Hellwig" <hch@infradead.org>,
"Peter Zijlstra" <peterz@infradead.org>,
"David Woodhouse" <dwmw2@infradead.org>,
"Lu Baolu" <baolu.lu@linux.intel.com>,
"Dave Hansen" <dave.hansen@intel.com>,
"Tony Luck" <tony.luck@intel.com>,
"Randy Dunlap" <rdunlap@infradead.org>,
"Ashok Raj" <ashok.raj@intel.com>,
"Jacob Jun Pan" <jacob.jun.pan@intel.com>,
"Dave Jiang" <dave.jiang@intel.com>,
"Sohil Mehta" <sohil.mehta@intel.com>,
"Ravi V Shankar" <ravi.v.shankar@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>,
iommu@lists.linux-foundation.org, x86 <x86@kernel.org>,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: [PATCH v8 4/9] x86/cpufeatures: Enumerate ENQCMD and ENQCMDS instructions
Date: Tue, 15 Sep 2020 09:30:08 -0700 [thread overview]
Message-ID: <1600187413-163670-5-git-send-email-fenghua.yu@intel.com> (raw)
In-Reply-To: <1600187413-163670-1-git-send-email-fenghua.yu@intel.com>
Work submission instruction comes in two flavors. ENQCMD can be called
both in ring 3 and ring 0 and always uses the contents of PASID MSR when
shipping the command to the device. ENQCMDS allows a kernel driver to
submit commands on behalf of a user process. The driver supplies the
PASID value in ENQCMDS. There isn't any usage of ENQCMD in the kernel
as of now.
The CPU feature flag is shown as "enqcmd" in /proc/cpuinfo.
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
---
v2:
- Re-write commit message (Thomas)
arch/x86/include/asm/cpufeatures.h | 1 +
arch/x86/kernel/cpu/cpuid-deps.c | 1 +
2 files changed, 2 insertions(+)
diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
index 2901d5df4366..fea10d04d05f 100644
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h
@@ -353,6 +353,7 @@
#define X86_FEATURE_CLDEMOTE (16*32+25) /* CLDEMOTE instruction */
#define X86_FEATURE_MOVDIRI (16*32+27) /* MOVDIRI instruction */
#define X86_FEATURE_MOVDIR64B (16*32+28) /* MOVDIR64B instruction */
+#define X86_FEATURE_ENQCMD (16*32+29) /* ENQCMD and ENQCMDS instructions */
/* AMD-defined CPU features, CPUID level 0x80000007 (EBX), word 17 */
#define X86_FEATURE_OVERFLOW_RECOV (17*32+ 0) /* MCA overflow recovery support */
diff --git a/arch/x86/kernel/cpu/cpuid-deps.c b/arch/x86/kernel/cpu/cpuid-deps.c
index 3cbe24ca80ab..3a02707c1f4d 100644
--- a/arch/x86/kernel/cpu/cpuid-deps.c
+++ b/arch/x86/kernel/cpu/cpuid-deps.c
@@ -69,6 +69,7 @@ static const struct cpuid_dep cpuid_deps[] = {
{ X86_FEATURE_CQM_MBM_TOTAL, X86_FEATURE_CQM_LLC },
{ X86_FEATURE_CQM_MBM_LOCAL, X86_FEATURE_CQM_LLC },
{ X86_FEATURE_AVX512_BF16, X86_FEATURE_AVX512VL },
+ { X86_FEATURE_ENQCMD, X86_FEATURE_XSAVES },
{}
};
--
2.19.1
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next prev parent reply other threads:[~2020-09-15 16:30 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-15 16:30 [PATCH v8 0/9] x86: tag application address space for devices Fenghua Yu
2020-09-15 16:30 ` [PATCH v8 1/9] drm, iommu: Change type of pasid to u32 Fenghua Yu
2020-09-15 16:30 ` [PATCH v8 2/9] iommu/vt-d: Change flags type to unsigned int in binding mm Fenghua Yu
2020-09-15 16:30 ` [PATCH v8 3/9] Documentation/x86: Add documentation for SVA (Shared Virtual Addressing) Fenghua Yu
2020-09-17 7:53 ` Borislav Petkov
2020-09-17 14:56 ` Raj, Ashok
2020-09-17 17:18 ` Borislav Petkov
2020-09-17 17:22 ` Raj, Ashok
2020-09-17 17:30 ` Borislav Petkov
2020-09-18 16:22 ` Fenghua Yu
2020-09-15 16:30 ` Fenghua Yu [this message]
2020-09-15 16:30 ` [PATCH v8 5/9] x86/fpu/xstate: Add supervisor PASID state for ENQCMD feature Fenghua Yu
2020-09-15 16:30 ` [PATCH v8 6/9] x86/msr-index: Define IA32_PASID MSR Fenghua Yu
2020-09-15 16:30 ` [PATCH v8 7/9] mm: Define pasid in mm Fenghua Yu
2020-09-15 16:30 ` [PATCH v8 8/9] x86/cpufeatures: Mark ENQCMD as disabled when configured out Fenghua Yu
2020-09-15 16:30 ` [PATCH v8 9/9] x86/mmu: Allocate/free PASID Fenghua Yu
2021-05-29 9:17 ` [PATCH] x86/cpufeatures: Force disable X86_FEATURE_ENQCMD and remove update_pasid() Thomas Gleixner
2021-05-31 8:43 ` Borislav Petkov
2021-05-31 10:16 ` Thomas Gleixner
2021-06-02 20:37 ` Luck, Tony
2021-06-03 17:31 ` Andy Lutomirski
2021-06-09 17:32 ` Luck, Tony
2021-06-09 23:34 ` Andy Lutomirski
2021-06-25 15:46 ` Luck, Tony
2021-06-02 10:14 ` Borislav Petkov
2021-06-02 10:20 ` Thomas Gleixner
2021-06-03 11:20 ` Vinod Koul
2021-06-03 11:42 ` Borislav Petkov
2021-06-03 12:47 ` Vinod Koul
2021-06-03 14:33 ` Borislav Petkov
2020-09-16 8:06 ` [PATCH v8 0/9] x86: tag application address space for devices Joerg Roedel
2020-09-17 23:53 ` Fenghua Yu
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