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From: "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com>
To: Michael Ellerman <mpe@ellerman.id.au>
Cc: Daniel Borkmann <daniel@iogearbox.net>,
	Yauheni Kaliuta <yauheni.kaliuta@redhat.com>,
	bpf@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
	Alexei Starovoitov <alexei.starovoitov@gmail.com>,
	Hari Bathini <hbathini@linux.ibm.com>
Subject: [PATCH powerpc/next 05/17] powerpc64/bpf: Use r12 for constant blinding
Date: Mon, 14 Feb 2022 16:11:39 +0530	[thread overview]
Message-ID: <e109f98617eacb4512c17a48525e94eda42889e6.1644834730.git.naveen.n.rao@linux.vnet.ibm.com> (raw)
In-Reply-To: <cover.1644834730.git.naveen.n.rao@linux.vnet.ibm.com>

In preparation for preserving kernel toc in r2, switch BPF_REG_AX from
r2 to r12. r12 is not used by bpf JIT except during external helper/bpf
calls, or with BPF_NOSPEC. These sequences aren't emitted when
BPF_REG_AX is used for constant blinding and other purposes.

Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
---
 arch/powerpc/net/bpf_jit64.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/net/bpf_jit64.h b/arch/powerpc/net/bpf_jit64.h
index b63b35e45e558c..82cdfee412784a 100644
--- a/arch/powerpc/net/bpf_jit64.h
+++ b/arch/powerpc/net/bpf_jit64.h
@@ -56,7 +56,7 @@ const int b2p[MAX_BPF_JIT_REG + 2] = {
 	/* frame pointer aka BPF_REG_10 */
 	[BPF_REG_FP] = 31,
 	/* eBPF jit internal registers */
-	[BPF_REG_AX] = 2,
+	[BPF_REG_AX] = 12,
 	[TMP_REG_1] = 9,
 	[TMP_REG_2] = 10
 };
-- 
2.35.1


  parent reply	other threads:[~2022-02-14 10:45 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-02-14 10:41 [PATCH powerpc/next 00/17] powerpc/bpf: Some updates and cleanups Naveen N. Rao
2022-02-14 10:41 ` [PATCH powerpc/next 01/17] powerpc/bpf: Skip branch range validation during first pass Naveen N. Rao
2022-02-14 10:41 ` [PATCH powerpc/next 02/17] powerpc/bpf: Emit a single branch instruction for known short branch ranges Naveen N. Rao
2022-02-14 10:41 ` [PATCH powerpc/next 03/17] powerpc/bpf: Handle large branch ranges with BPF_EXIT Naveen N. Rao
2022-02-14 10:41 ` [PATCH powerpc/next 04/17] powerpc64/bpf: Do not save/restore LR on each call to bpf_stf_barrier() Naveen N. Rao
2022-02-14 10:41 ` Naveen N. Rao [this message]
2022-02-14 10:41 ` [PATCH powerpc/next 06/17] powerpc64: Set PPC64_ELF_ABI_v[1|2] macros to 1 Naveen N. Rao
2022-02-14 10:41 ` [PATCH powerpc/next 07/17] powerpc64/bpf elfv2: Setup kernel TOC in r2 on entry Naveen N. Rao
2022-02-14 10:41 ` [PATCH powerpc/next 08/17] powerpc64/bpf elfv1: Do not load TOC before calling functions Naveen N. Rao
2022-02-14 10:41 ` [PATCH powerpc/next 09/17] powerpc64/bpf: Optimize instruction sequence used for function calls Naveen N. Rao
2022-02-14 10:41 ` [PATCH powerpc/next 10/17] powerpc/bpf: Rename PPC_BL_ABS() to PPC_BL() Naveen N. Rao
2022-02-14 10:41 ` [PATCH powerpc/next 11/17] powerpc64/bpf: Convert some of the uses of PPC_BPF_[LL|STL] to PPC_BPF_[LD|STD] Naveen N. Rao
2022-02-14 10:41 ` [PATCH powerpc/next 12/17] powerpc64/bpf: Get rid of PPC_BPF_[LL|STL|STLU] macros Naveen N. Rao
2022-02-14 10:41 ` [PATCH powerpc/next 13/17] powerpc/bpf: Cleanup bpf_jit.h Naveen N. Rao
2022-02-14 10:41 ` [PATCH powerpc/next 14/17] powerpc/bpf: Move bpf_jit64.h into bpf_jit_comp64.c Naveen N. Rao
2022-02-14 10:41 ` [PATCH powerpc/next 15/17] powerpc/bpf: Use _Rn macros for GPRs Naveen N. Rao
2022-02-14 10:41 ` [PATCH powerpc/next 16/17] powerpc64/bpf: Store temp registers' bpf to ppc mapping Naveen N. Rao
2022-02-14 10:41 ` [PATCH powerpc/next 17/17] powerpc/bpf: Simplify bpf_to_ppc() and adopt it for powerpc64 Naveen N. Rao
2022-03-08 12:08 ` [PATCH powerpc/next 00/17] powerpc/bpf: Some updates and cleanups Michael Ellerman

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