linux-kernel - [tip: x86/pasid] x86/msr-index: Define an IA32

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Date:   Fri, 18 Sep 2020 07:42:30 -0000
From:   "tip-bot2 for Fenghua Yu" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Fenghua Yu <fenghua.yu@...el.com>, Borislav Petkov <bp@...e.de>,
        Tony Luck <tony.luck@...el.com>, x86 <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [tip: x86/pasid] x86/msr-index: Define an IA32_PASID MSR

The following commit has been merged into the x86/pasid branch of tip:

Commit-ID:     f0f2f9feb4ee6f28729e5388da3c03ce1dac077a
Gitweb:        https://git.kernel.org/tip/f0f2f9feb4ee6f28729e5388da3c03ce1dac077a
Author:        Fenghua Yu <fenghua.yu@...el.com>
AuthorDate:    Tue, 15 Sep 2020 09:30:10 -07:00
Committer:     Borislav Petkov <bp@...e.de>
CommitterDate: Thu, 17 Sep 2020 20:22:15 +02:00

x86/msr-index: Define an IA32_PASID MSR

The IA32_PASID MSR (0xd93) contains the Process Address Space Identifier
(PASID), a 20-bit value. Bit 31 must be set to indicate the value
programmed in the MSR is valid. Hardware uses the PASID to identify a
process address space and direct responses to the right address space.

Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>
Signed-off-by: Borislav Petkov <bp@...e.de>
Reviewed-by: Tony Luck <tony.luck@...el.com>
Link: https://lkml.kernel.org/r/1600187413-163670-7-git-send-email-fenghua.yu@intel.com
---
 arch/x86/include/asm/msr-index.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
index 2859ee4..aaddc6a 100644
--- a/arch/x86/include/asm/msr-index.h
+++ b/arch/x86/include/asm/msr-index.h
@@ -257,6 +257,9 @@
 #define MSR_IA32_LASTINTFROMIP		0x000001dd
 #define MSR_IA32_LASTINTTOIP		0x000001de
 
+#define MSR_IA32_PASID			0x00000d93
+#define MSR_IA32_PASID_VALID		BIT_ULL(31)
+
 /* DEBUGCTLMSR bits (others vary by model): */
 #define DEBUGCTLMSR_LBR			(1UL <<  0) /* last branch recording */
 #define DEBUGCTLMSR_BTF_SHIFT		1