wireguard-linux/arch/powerpc/kernel/head_booke.h, branch jd/orphan-parallel

powerpc: Remove SYNC on non 6xx

2020-10-08T10:17:12Z

SYNC is usefull for Powerpc 601 only. On everything else, SYNC is empty. Remove it from code that is not made to run on 6xx. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/27951fa6c9a8f80724d1bc81a6117ac32343a55d.1601362098.git.christophe.leroy@csgroup.eu

powerpc: Replace _ALIGN_UP() by ALIGN()

2020-05-11T13:15:15Z

_ALIGN_UP() is specific to powerpc ALIGN() is generic and does the same Replace _ALIGN_UP() by ALIGN() Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Reviewed-by: Joel Stanley Link: https://lore.kernel.org/r/8a6d7e45f7904c73a0af539642d3962e2a3c7268.1587407777.git.christophe.leroy@c-s.fr

powerpc/32: Warn and return ENOSYS on syscalls from kernel

2020-02-19T11:46:08Z

Since commit b86fb88855ea ("powerpc/32: implement fast entry for syscalls on non BOOKE") and commit 1a4b739bbb4f ("powerpc/32: implement fast entry for syscalls on BOOKE"), syscalls from kernel are unexpected and can have catastrophic consequences as it will destroy the kernel stack. Test MSR_PR on syscall entry. In case syscall is from kernel, emit a warning and return ENOSYS error. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/8ee3bdbbdfdfc64ca7001e90c43b2aee6f333578.1580470482.git.christophe.leroy@c-s.fr

powerpc/32: save DEAR/DAR before calling handle_page_fault

2020-01-26T11:15:09Z

handle_page_fault() is the only function that save DAR/DEAR itself. Save DAR/DEAR before calling handle_page_fault() to prepare for VMAP stack which will require to save even before. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/3a4d58d378091086f00fde42b59610c80289e120.1576916812.git.christophe.leroy@c-s.fr

powerpc/32: fix build failure on book3e with KVM

2019-06-15T14:03:38Z

Build failure was introduced by the commit identified below, due to missed macro expension leading to wrong called function's name. arch/powerpc/kernel/head_fsl_booke.o: In function `SystemCall': arch/powerpc/kernel/head_fsl_booke.S:416: undefined reference to `kvmppc_handler_BOOKE_INTERRUPT_SYSCALL_SPRN_SRR1' Makefile:1052: recipe for target 'vmlinux' failed The called function should be kvmppc_handler_8_0x01B(). This patch fixes it. Reported-by: Paul Mackerras Fixes: 1a4b739bbb4f ("powerpc/32: implement fast entry for syscalls on BOOKE") Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman

powerpc/booke: fix fast syscall entry on SMP

2019-06-15T13:44:41Z

Use r10 instead of r9 to calculate CPU offset as r9 contains the value from SRR1 which is used later. Fixes: 1a4b739bbb4f ("powerpc/32: implement fast entry for syscalls on BOOKE") Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman

powerpc/32: implement fast entry for syscalls on BOOKE

2019-05-02T15:20:27Z

This patch implements a fast entry for syscalls. Syscalls don't have to preserve non volatile registers except LR. This patch then implement a fast entry for syscalls, where volatile registers get clobbered. As this entry is dedicated to syscall it always sets MSR_EE and warns in case MSR_EE was previously off It also assumes that the call is always from user, system calls are unexpected from kernel. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman

powerpc/32: get rid of COPY_EE in exception entry

2019-05-02T15:20:27Z

EXC_XFER_TEMPLATE() is not called with COPY_EE anymore so we can get rid of copyee parameters and related COPY_EE and NOCOPY macros. Suggested-by: Benjamin Herrenschmidt [splited out from benh RFC patch] Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman

powerpc/32: Enter exceptions with MSR_EE unset

2019-05-02T15:20:27Z

All exceptions handlers know when to reenable interrupts, so it is safer to enter all of them with MSR_EE unset, except for syscalls. Suggested-by: Benjamin Herrenschmidt [splited out from benh RFC patch] Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman

powerpc/32: enter syscall with MSR_EE inconditionaly set

2019-05-02T15:20:27Z

syscalls are expected to be entered with MSR_EE set. Lets make it inconditional by forcing MSR_EE on syscalls. This patch adds EXC_XFER_SYS for that. Suggested-by: Benjamin Herrenschmidt [splited out from benh RFC patch] Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman