This reverts commit 7f5917da48dd9f50ca7170356efbdb4cadf3c47c. --- arch/arm64/include/asm/ptrace.h | 5 ----- arch/arm64/kernel/head.S | 25 +++++++++---------------- 2 files changed, 9 insertions(+), 21 deletions(-)

diff --git a/arch/arm64/include/asm/ptrace.h b/arch/arm64/include/asm/ptrace.h index 408bc4719f3b2..f1662df255caf 100644 --- a/arch/arm64/include/asm/ptrace.h +++ b/arch/arm64/include/asm/ptrace.h @@ -27,11 +27,6 @@ #define CurrentEL_EL1 (1 << 2) #define CurrentEL_EL2 (2 << 2)

-#define INIT_PSTATE_EL1 \ - (PSR_D_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT | PSR_MODE_EL1h) -#define INIT_PSTATE_EL2 \ - (PSR_D_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT | PSR_MODE_EL2h) - /* * PMR values used to mask/unmask interrupts. * diff --git a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S index 04dc533ea8b60..9f083b11efe25 100644 --- a/arch/arm64/kernel/head.S +++ b/arch/arm64/kernel/head.S @@ -465,24 +465,19 @@ ENTRY(kimage_vaddr) * If we're fortunate enough to boot at EL2, ensure that the world is * sane before dropping to EL1. * - * Since we cannot always rely on ERET synchronizing writes to sysregs (e.g. if - * SCTLR_ELx.EOS is clear), we place an ISB prior to ERET. - * * Returns either BOOT_CPU_MODE_EL1 or BOOT_CPU_MODE_EL2 in w0 if * booted in EL1 or EL2 respectively. */ ENTRY(el2_setup) + msr SPsel, #1 // We want to use SP_EL{1,2} mrs x0, CurrentEL cmp x0, #CurrentEL_EL2 b.eq 1f mov_q x0, (SCTLR_EL1_RES1 | ENDIAN_SET_EL1) msr sctlr_el1, x0 + mov w0, #BOOT_CPU_MODE_EL1 // This cpu booted in EL1 isb - mov_q x0, INIT_PSTATE_EL1 - msr spsr_el1, x0 - msr elr_el1, lr - mov w0, #BOOT_CPU_MODE_EL1 - eret + ret

1: mov_q x0, (SCTLR_EL2_RES1 | ENDIAN_SET_EL2) msr sctlr_el2, x0 @@ -593,12 +588,9 @@ set_hcr:

cbz x2, install_el2_stub

+ mov w0, #BOOT_CPU_MODE_EL2 // This CPU booted in EL2 isb - mov_q x0, INIT_PSTATE_EL2 - msr spsr_el2, x0 - msr elr_el2, lr - mov w0, #BOOT_CPU_MODE_EL2 - eret + ret

install_el2_stub: /* @@ -630,11 +622,12 @@ install_el2_stub: 7: adr_l x0, __hyp_stub_vectors msr vbar_el2, x0

- isb - mov x0, #INIT_PSTATE_EL1 + /* spsr */ + mov x0, #(PSR_F_BIT | PSR_I_BIT | PSR_A_BIT | PSR_D_BIT |\ + PSR_MODE_EL1h) msr spsr_el2, x0 msr elr_el2, lr - mov w0, #BOOT_CPU_MODE_EL2 + mov w0, #BOOT_CPU_MODE_EL2 // This CPU booted in EL2 eret ENDPROC(el2_setup)