Re: [PATCH V2 6.12.y 7/7] arm64/boot: Enable EL2 requirements for FEAT_PMUv3p9

[Sasha Levin <sashal@kernel.org>]

[ Sasha's backport helper bot ]

Hi,

Summary of potential issues:
ℹ️ This is part 7/7 of a series
⚠️ Found matching upstream commit but patch is missing proper reference to it

Found matching upstream commit: 858c7bfcb35e1100b58bb63c9f562d86e09418d9

Status in newer kernel trees:
6.14.y | Not found
6.13.y | Not found

Note: The patch differs from the upstream commit:
---
1:  858c7bfcb35e1 ! 1:  f5de0f647be12 arm64/boot: Enable EL2 requirements for FEAT_PMUv3p9
    @@ Commit message
         Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
         Link: https://lore.kernel.org/r/20250227035119.2025171-1-anshuman.khandual@arm.com
         Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
    +    (cherry picked from commit 858c7bfcb35e1100b58bb63c9f562d86e09418d9)
    +    Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
     
      ## Documentation/arch/arm64/booting.rst ##
     @@ Documentation/arch/arm64/booting.rst: Before jumping into the kernel, the following conditions must be met:
    @@ arch/arm64/include/asm/el2_setup.h
     +.Lskip_fgt2_\@:
     +.endm
     +
    - .macro __init_el2_gcs
    - 	mrs_s	x1, SYS_ID_AA64PFR1_EL1
    - 	ubfx	x1, x1, #ID_AA64PFR1_EL1_GCS_SHIFT, #4
    + .macro __init_el2_nvhe_prepare_eret
    + 	mov	x0, #INIT_PSTATE_EL1
    + 	msr	spsr_el2, x0
     @@
      	__init_el2_nvhe_idregs
      	__init_el2_cptr
      	__init_el2_fgt
     +	__init_el2_fgt2
    -         __init_el2_gcs
      .endm
      
    + #ifndef __KVM_NVHE_HYPERVISOR__
    +
    + ## arch/arm64/tools/sysreg ##
    +@@ arch/arm64/tools/sysreg: UnsignedEnum	11:8	PMUVer
    + 	0b0110	V3P5
    + 	0b0111	V3P7
    + 	0b1000	V3P8
    ++	0b1001	V3P9
    + 	0b1111	IMP_DEF
    + EndEnum
    + UnsignedEnum	7:4	TraceVer
---

NOTE: These results are for this patch alone. Full series testing will be
performed when all parts are received.

Results of testing on various branches:

| Branch                    | Patch Apply | Build Test |
|---------------------------|-------------|------------|
| stable/linux-6.13.y       |  Success    |  Success   |