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arm64: entry: Make the kpti trampoline's kpti sequence optional
commit c47e4d04ba
upstream.
Spectre-BHB needs to add sequences to the vectors. Having one global
set of vectors is a problem for big/little systems where the sequence
is costly on cpus that are not vulnerable.
Making the vectors per-cpu in the style of KVM's bh_harden_hyp_vecs
requires the vectors to be generated by macros.
Make the kpti re-mapping of the kernel optional, so the macros can be
used without kpti.
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
parent
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1 changed files with 12 additions and 6 deletions
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@ -646,9 +646,10 @@ alternative_else_nop_endif
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sub \dst, \dst, PAGE_SIZE
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.endm
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.macro tramp_ventry, vector_start, regsize
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.macro tramp_ventry, vector_start, regsize, kpti
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.align 7
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1:
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.if \kpti == 1
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.if \regsize == 64
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msr tpidrro_el0, x30 // Restored in kernel_ventry
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.endif
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@ -671,9 +672,14 @@ alternative_insn isb, nop, ARM64_WORKAROUND_QCOM_FALKOR_E1003
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alternative_if_not ARM64_WORKAROUND_CAVIUM_TX2_219_PRFM
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prfm plil1strm, [x30, #(1b - \vector_start)]
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alternative_else_nop_endif
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msr vbar_el1, x30
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add x30, x30, #(1b - \vector_start + 4)
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isb
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.else
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ldr x30, =vectors
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.endif // \kpti == 1
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add x30, x30, #(1b - \vector_start + 4)
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ret
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.org 1b + 128 // Did we overflow the ventry slot?
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.endm
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@ -691,15 +697,15 @@ alternative_else_nop_endif
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sb
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.endm
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.macro generate_tramp_vector
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.macro generate_tramp_vector, kpti
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.Lvector_start\@:
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.space 0x400
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.rept 4
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tramp_ventry .Lvector_start\@, 64
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tramp_ventry .Lvector_start\@, 64, \kpti
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.endr
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.rept 4
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tramp_ventry .Lvector_start\@, 32
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tramp_ventry .Lvector_start\@, 32, \kpti
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.endr
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.endm
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@ -710,7 +716,7 @@ alternative_else_nop_endif
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.pushsection ".entry.tramp.text", "ax"
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.align 11
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SYM_CODE_START_NOALIGN(tramp_vectors)
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generate_tramp_vector
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generate_tramp_vector kpti=1
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SYM_CODE_END(tramp_vectors)
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SYM_CODE_START(tramp_exit_native)
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