[PATCH v2 07/12] x86/msr-index: Define IA32_PASID MSR

Fenghua Yu fenghua.yu at intel.com
Sat Jun 13 00:41:28 UTC 2020

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 PASID to identify process
address space and direct responses to the right address space.

Signed-off-by: Fenghua Yu <fenghua.yu at intel.com>
Reviewed-by: Tony Luck <tony.luck at intel.com>
- Change "identify process" to "identify process address space" in the
  commit message (Thomas)

 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 e8370e64a155..e5f699ff1dd6 100644
--- a/arch/x86/include/asm/msr-index.h
+++ b/arch/x86/include/asm/msr-index.h
@@ -237,6 +237,9 @@
 #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 */

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