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From: Fenghua Yu <fenghua.yu@intel.com>
To: "Thomas Gleixner" <tglx@linutronix.de>,
	"Joerg Roedel" <joro@8bytes.org>,
	"Ingo Molnar" <mingo@redhat.com>,
	"Borislav Petkov" <bp@alien8.de>,
	"Peter Zijlstra" <peterz@infradead.org>,
	"H Peter Anvin" <hpa@zytor.com>,
	"David Woodhouse" <dwmw2@infradead.org>,
	"Lu Baolu" <baolu.lu@linux.intel.com>,
	"Felix Kuehling" <Felix.Kuehling@amd.com>,
	"Dave Hansen" <dave.hansen@intel.com>,
	"Tony Luck" <tony.luck@intel.com>,
	"Jean-Philippe Brucker" <jean-philippe@linaro.org>,
	"Christoph Hellwig" <hch@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>,
	amd-gfx <amd-gfx@lists.freedesktop.org>
Subject: [PATCH v5 04/12] x86/cpufeatures: Enumerate ENQCMD and ENQCMDS instructions
Date: Tue, 30 Jun 2020 16:44:34 -0700
Message-ID: <1593560682-40814-5-git-send-email-fenghua.yu@intel.com> (raw)
In-Reply-To: <1593560682-40814-1-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 02dabc9e77b0..4469618c410f 100644
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h
@@ -351,6 +351,7 @@
 #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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  parent reply index

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-30 23:44 [PATCH v5 00/12] x86: tag application address space for devices Fenghua Yu
2020-06-30 23:44 ` [PATCH v5 01/12] iommu: Change type of pasid to u32 Fenghua Yu
2020-07-01  2:12   ` Felix Kuehling
2020-07-02 19:10     ` Fenghua Yu
2020-07-03  5:32       ` Felix Kuehling
2020-06-30 23:44 ` [PATCH v5 02/12] iommu/vt-d: Change flags type to unsigned int in binding mm Fenghua Yu
2020-06-30 23:44 ` [PATCH v5 03/12] docs: x86: Add documentation for SVA (Shared Virtual Addressing) Fenghua Yu
2020-06-30 23:44 ` Fenghua Yu [this message]
2020-06-30 23:44 ` [PATCH v5 05/12] x86/fpu/xstate: Add supervisor PASID state for ENQCMD feature Fenghua Yu
2020-06-30 23:44 ` [PATCH v5 06/12] x86/msr-index: Define IA32_PASID MSR Fenghua Yu
2020-06-30 23:44 ` [PATCH v5 07/12] mm: Define pasid in mm Fenghua Yu
2020-06-30 23:44 ` [PATCH v5 08/12] fork: Clear PASID for new mm Fenghua Yu
2020-06-30 23:44 ` [PATCH v5 09/12] x86/process: Clear PASID state for a newly forked/cloned thread Fenghua Yu
2020-06-30 23:44 ` [PATCH v5 10/12] x86/mmu: Allocate/free PASID Fenghua Yu
2020-06-30 23:44 ` [PATCH v5 11/12] sched: Define and initialize a flag to identify valid PASID in the task Fenghua Yu
2020-06-30 23:44 ` [PATCH v5 12/12] x86/traps: Fix up invalid PASID Fenghua Yu

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