Hi all,

Today's linux-next merge of the kvm-arm tree got a conflict in:

  arch/arm64/kernel/cpufeature.c

between commits:

  9cce9c6c2c3b ("arm64: mm: Handle LVA support as a CPU feature")
  352b0395b505 ("arm64: Enable 52-bit virtual addressing for 4k and 16k granule configs")

from the arm64 tree and commit:

  da9af5071b25 ("arm64: cpufeature: Detect HCR_EL2.NV1 being RES0")

from the kvm-arm tree.

I fixed it up (see below) and can carry the fix as necessary. This
is now fixed as far as linux-next is concerned, but any non trivial
conflicts should be mentioned to your upstream maintainer when your tree
is submitted for merging.  You may also want to consider cooperating
with the maintainer of the conflicting tree to minimise any particularly
complex conflicts.

-- 
Cheers,
Stephen Rothwell

diff --cc arch/arm64/kernel/cpufeature.c
index 0be9296e9253,f309fd542c20..000000000000
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@@ -721,13 -754,12 +756,14 @@@ static const struct __ftr_reg_entry 
  			       &id_aa64isar2_override),
  
  	/* Op1 = 0, CRn = 0, CRm = 7 */
 -	ARM64_FTR_REG(SYS_ID_AA64MMFR0_EL1, ftr_id_aa64mmfr0),
 +	ARM64_FTR_REG_OVERRIDE(SYS_ID_AA64MMFR0_EL1, ftr_id_aa64mmfr0,
 +			       &id_aa64mmfr0_override),
  	ARM64_FTR_REG_OVERRIDE(SYS_ID_AA64MMFR1_EL1, ftr_id_aa64mmfr1,
  			       &id_aa64mmfr1_override),
 -	ARM64_FTR_REG(SYS_ID_AA64MMFR2_EL1, ftr_id_aa64mmfr2),
 +	ARM64_FTR_REG_OVERRIDE(SYS_ID_AA64MMFR2_EL1, ftr_id_aa64mmfr2,
 +			       &id_aa64mmfr2_override),
  	ARM64_FTR_REG(SYS_ID_AA64MMFR3_EL1, ftr_id_aa64mmfr3),
+ 	ARM64_FTR_REG(SYS_ID_AA64MMFR4_EL1, ftr_id_aa64mmfr4),
  
  	/* Op1 = 1, CRn = 0, CRm = 0 */
  	ARM64_FTR_REG(SYS_GMID_EL1, ftr_gmid),
@@@ -2701,33 -2817,13 +2779,40 @@@ static const struct arm64_cpu_capabilit
  		.type = ARM64_CPUCAP_SYSTEM_FEATURE,
  		.matches = has_lpa2,
  	},
 +#ifdef CONFIG_ARM64_VA_BITS_52
 +	{
 +		.capability = ARM64_HAS_VA52,
 +		.type = ARM64_CPUCAP_BOOT_CPU_FEATURE,
 +		.matches = has_cpuid_feature,
 +		.field_width = 4,
 +#ifdef CONFIG_ARM64_64K_PAGES
 +		.desc = "52-bit Virtual Addressing (LVA)",
 +		.sign = FTR_SIGNED,
 +		.sys_reg = SYS_ID_AA64MMFR2_EL1,
 +		.field_pos = ID_AA64MMFR2_EL1_VARange_SHIFT,
 +		.min_field_value = ID_AA64MMFR2_EL1_VARange_52,
 +#else
 +		.desc = "52-bit Virtual Addressing (LPA2)",
 +		.sys_reg = SYS_ID_AA64MMFR0_EL1,
 +#ifdef CONFIG_ARM64_4K_PAGES
 +		.sign = FTR_SIGNED,
 +		.field_pos = ID_AA64MMFR0_EL1_TGRAN4_SHIFT,
 +		.min_field_value = ID_AA64MMFR0_EL1_TGRAN4_52_BIT,
 +#else
 +		.sign = FTR_UNSIGNED,
 +		.field_pos = ID_AA64MMFR0_EL1_TGRAN16_SHIFT,
 +		.min_field_value = ID_AA64MMFR0_EL1_TGRAN16_52_BIT,
 +#endif
 +#endif
 +	},
 +#endif
+ 	{
+ 		.desc = "NV1",
+ 		.capability = ARM64_HAS_HCR_NV1,
+ 		.type = ARM64_CPUCAP_SYSTEM_FEATURE,
+ 		.matches = has_nv1,
+ 		ARM64_CPUID_FIELDS_NEG(ID_AA64MMFR4_EL1, E2H0, NI_NV1)
+ 	},
  	{},
  };