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: "linux-kernel" <linux-kernel@vger.kernel.org>, "x86" <x86@kernel.org>, iommu@lists.linux-foundation.org, Fenghua Yu <fenghua.yu@intel.com> 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
WARNING: multiple messages have this Message-ID (diff)
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 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
next prev parent reply other threads:[~2020-09-15 22:16 UTC|newest] Thread overview: 70+ 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 2020-09-18 7:42 ` [tip: x86/pasid] " tip-bot2 for 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 ` Fenghua Yu 2020-09-18 7:42 ` [tip: x86/pasid] " tip-bot2 for 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 7:53 ` Borislav Petkov 2020-09-17 14:56 ` Raj, Ashok 2020-09-17 14:56 ` Raj, Ashok 2020-09-17 17:18 ` Borislav Petkov 2020-09-17 17:18 ` Borislav Petkov 2020-09-17 17:22 ` Raj, Ashok 2020-09-17 17:22 ` Raj, Ashok 2020-09-17 17:30 ` Borislav Petkov 2020-09-17 17:30 ` Borislav Petkov 2020-09-18 16:22 ` Fenghua Yu 2020-09-18 16:22 ` Fenghua Yu 2020-09-18 7:42 ` [tip: x86/pasid] " tip-bot2 for Ashok Raj 2020-09-15 16:30 ` Fenghua Yu [this message] 2020-09-15 16:30 ` [PATCH v8 4/9] x86/cpufeatures: Enumerate ENQCMD and ENQCMDS instructions Fenghua Yu 2020-09-18 7:42 ` [tip: x86/pasid] " tip-bot2 for Fenghua Yu 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 ` Fenghua Yu 2020-09-18 7:42 ` [tip: x86/pasid] x86/fpu/xstate: Add supervisor PASID state for ENQCMD tip-bot2 for Yu-cheng Yu 2020-09-15 16:30 ` [PATCH v8 6/9] x86/msr-index: Define IA32_PASID MSR Fenghua Yu 2020-09-15 16:30 ` Fenghua Yu 2020-09-18 7:42 ` [tip: x86/pasid] x86/msr-index: Define an " tip-bot2 for Fenghua Yu 2020-09-15 16:30 ` [PATCH v8 7/9] mm: Define pasid in mm Fenghua Yu 2020-09-18 7:42 ` [tip: x86/pasid] mm: Add a pasid member to struct mm_struct tip-bot2 for Fenghua Yu 2020-09-15 16:30 ` [PATCH v8 8/9] x86/cpufeatures: Mark ENQCMD as disabled when configured out Fenghua Yu 2020-09-18 7:42 ` [tip: x86/pasid] " tip-bot2 for Fenghua Yu 2020-09-15 16:30 ` [PATCH v8 9/9] x86/mmu: Allocate/free PASID Fenghua Yu 2020-09-15 16:30 ` Fenghua Yu 2020-09-18 7:42 ` [tip: x86/pasid] x86/mmu: Allocate/free a PASID tip-bot2 for Fenghua Yu 2021-05-29 9:17 ` [PATCH] x86/cpufeatures: Force disable X86_FEATURE_ENQCMD and remove update_pasid() Thomas Gleixner 2021-05-29 9:17 ` Thomas Gleixner 2021-05-31 8:43 ` Borislav Petkov 2021-05-31 8:43 ` Borislav Petkov 2021-05-31 10:16 ` Thomas Gleixner 2021-05-31 10:16 ` Thomas Gleixner 2021-06-02 20:37 ` Luck, Tony 2021-06-02 20:37 ` Luck, Tony 2021-06-03 17:31 ` Andy Lutomirski 2021-06-03 17:31 ` Andy Lutomirski 2021-06-09 17:32 ` Luck, Tony 2021-06-09 17:32 ` Luck, Tony 2021-06-09 23:34 ` Andy Lutomirski 2021-06-09 23:34 ` Andy Lutomirski 2021-06-25 15:46 ` Luck, Tony 2021-06-25 15:46 ` Luck, Tony 2021-06-02 10:14 ` Borislav Petkov 2021-06-02 10:14 ` Borislav Petkov 2021-06-02 10:20 ` Thomas Gleixner 2021-06-02 10:20 ` Thomas Gleixner 2021-06-03 11:20 ` Vinod Koul 2021-06-03 11:20 ` Vinod Koul 2021-06-03 11:42 ` Borislav Petkov 2021-06-03 11:42 ` Borislav Petkov 2021-06-03 12:47 ` Vinod Koul 2021-06-03 12:47 ` Vinod Koul 2021-06-03 14:33 ` Borislav Petkov 2021-06-03 14:33 ` Borislav Petkov 2021-06-02 19:49 ` [tip: x86/urgent] " tip-bot2 for Thomas Gleixner 2021-06-03 14:38 ` tip-bot2 for Thomas Gleixner 2020-09-16 8:06 ` [PATCH v8 0/9] x86: tag application address space for devices Joerg Roedel 2020-09-16 8:06 ` Joerg Roedel 2020-09-17 23:53 ` Fenghua Yu 2020-09-17 23:53 ` Fenghua Yu
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