[PATCH v6 04/18] arm64: Add a helper for PARange to physical shift conversion

Suzuki K Poulose suzuki.poulose at arm.com
Wed Sep 26 09:32:40 PDT 2018


On arm64, ID_AA64MMFR0_EL1.PARange encodes the maximum Physical
Address range supported by the CPU. Add a helper to decode this
to actual physical shift. If we hit an unallocated value, return
the maximum range supported by the kernel.
This will be used by KVM to set the VTCR_EL2.T0SZ, as it
is about to move its place. Having this helper keeps the code
movement cleaner.

Cc: Catalin Marinas <catalin.marinas at arm.com>
Cc: Marc Zyngier <marc.zyngier at arm.com>
Cc: James Morse <james.morse at arm.com>
Cc: Christoffer Dall <cdall at kernel.org>
Reviewed-by: Eric Auger <eric.auger at redhat.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose at arm.com>
---
Changes since V4:
 - Add a comment on the result for unknown values.
---
 arch/arm64/include/asm/cpufeature.h | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h
index 1717ba1db35d..072cc1c970c2 100644
--- a/arch/arm64/include/asm/cpufeature.h
+++ b/arch/arm64/include/asm/cpufeature.h
@@ -530,6 +530,26 @@ void arm64_set_ssbd_mitigation(bool state);
 static inline void arm64_set_ssbd_mitigation(bool state) {}
 #endif
 
+static inline u32 id_aa64mmfr0_parange_to_phys_shift(int parange)
+{
+	switch (parange) {
+	case 0: return 32;
+	case 1: return 36;
+	case 2: return 40;
+	case 3: return 42;
+	case 4: return 44;
+	case 5: return 48;
+	case 6: return 52;
+	/*
+	 * A future PE could use a value unknown to the kernel.
+	 * However, by the "D10.1.4 Principles of the ID scheme
+	 * for fields in ID registers", ARM DDI 0487C.a, any new
+	 * value is guaranteed to be higher than what we know already.
+	 * As a safe limit, we return the limit supported by the kernel.
+	 */
+	default: return CONFIG_ARM64_PA_BITS;
+	}
+}
 #endif /* __ASSEMBLY__ */
 
 #endif
-- 
2.19.0




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