[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [xen staging] xen/arm: head: Add missing isb after writing to SCTLR_EL2/HSCTLR
commit 25424d1a6b7b7e875230aba77c2f044a4883e49a Author: Julien Grall <jgrall@xxxxxxxxxx> AuthorDate: Sat Jul 16 15:34:07 2022 +0100 Commit: Julien Grall <julien@xxxxxxx> CommitDate: Sun Jul 17 14:10:08 2022 +0100 xen/arm: head: Add missing isb after writing to SCTLR_EL2/HSCTLR Write to SCTLR_EL2/HSCTLR may not be visible until the next context synchronization. When initializing the CPU, we want the update to take effect right now. So add an isb afterwards. Spec references: - AArch64: D13.1.2 ARM DDI 0406C.d - AArch32 v8: G8.1.2 ARM DDI 0406C.d - AArch32 v7: B5.6.3 ARM DDI 0406C.d Signed-off-by: Julien Grall <jgrall@xxxxxxxxxx> Reviewed-by: Michal Orzel <michal.orzel@xxxxxxx> Reviewed-by: Bertrand Marquis <bertrand.marquis@xxxxxxx> --- xen/arch/arm/arm32/head.S | 1 + xen/arch/arm/arm64/head.S | 1 + 2 files changed, 2 insertions(+) diff --git a/xen/arch/arm/arm32/head.S b/xen/arch/arm/arm32/head.S index 77f0a619ca..98ccf18b51 100644 --- a/xen/arch/arm/arm32/head.S +++ b/xen/arch/arm/arm32/head.S @@ -353,6 +353,7 @@ cpu_init_done: ldr r0, =HSCTLR_SET mcr CP32(r0, HSCTLR) + isb mov pc, r5 /* Return address is in r5 */ ENDPROC(cpu_init) diff --git a/xen/arch/arm/arm64/head.S b/xen/arch/arm/arm64/head.S index 109ae7de0c..1babcc65d7 100644 --- a/xen/arch/arm/arm64/head.S +++ b/xen/arch/arm/arm64/head.S @@ -486,6 +486,7 @@ cpu_init: ldr x0, =SCTLR_EL2_SET msr SCTLR_EL2, x0 + isb /* * Ensure that any exceptions encountered at EL2 -- generated by git-patchbot for /home/xen/git/xen.git#staging
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