Commit 33b5c388 authored by Marc Zyngier's avatar Marc Zyngier Committed by Christoffer Dall
Browse files

arm: KVM: Allow unaligned accesses at HYP 



We currently have the HSCTLR.A bit set, trapping unaligned accesses
at HYP, but we're not really prepared to deal with it.

Since the rest of the kernel is pretty happy about that, let's follow
its example and set HSCTLR.A to zero. Modern CPUs don't really care.

Cc: stable@vger.kernel.org
Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
Signed-off-by: default avatarChristoffer Dall <cdall@linaro.org>
parent 78fd6dcf

arch/arm/kvm/init.S

+2 −3
Original line number Diff line number Diff line
@@ -104,7 +104,6 @@ __do_hyp_init: 
	@  - Write permission implies XN: disabled

	@  - Instruction cache: enabled

	@  - Data/Unified cache: enabled

	@  - Memory alignment checks: enabled

	@  - MMU: enabled (this code must be run from an identity mapping)

	mrc	p15, 4, r0, c1, c0, 0	@ HSCR

	ldr	r2, =HSCTLR_MASK
@@ -112,8 +111,8 @@ __do_hyp_init: 
	mrc	p15, 0, r1, c1, c0, 0	@ SCTLR

	ldr	r2, =(HSCTLR_EE | HSCTLR_FI | HSCTLR_I | HSCTLR_C)

	and	r1, r1, r2

 ARM(	ldr	r2, =(HSCTLR_M | HSCTLR_A)			)

 THUMB(	ldr	r2, =(HSCTLR_M | HSCTLR_A | HSCTLR_TE)		)

 ARM(	ldr	r2, =(HSCTLR_M)					)

 THUMB(	ldr	r2, =(HSCTLR_M | HSCTLR_TE)			)

	orr	r1, r1, r2

	orr	r0, r0, r1

	mcr	p15, 4, r0, c1, c0, 0	@ HSCR

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