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-rw-r--r--arch/arm64/net/bpf_jit_comp.c6
-rw-r--r--arch/powerpc/include/asm/hvcall.h20
-rw-r--r--arch/s390/net/bpf_jit_comp.c13
-rw-r--r--arch/x86/net/bpf_jit_comp.c40
4 files changed, 57 insertions, 22 deletions
diff --git a/arch/arm64/net/bpf_jit_comp.c b/arch/arm64/net/bpf_jit_comp.c
index b162ad7..7658612 100644
--- a/arch/arm64/net/bpf_jit_comp.c
+++ b/arch/arm64/net/bpf_jit_comp.c
@@ -152,8 +152,6 @@ static void build_prologue(struct jit_ctx *ctx)
const u8 r8 = bpf2a64[BPF_REG_8];
const u8 r9 = bpf2a64[BPF_REG_9];
const u8 fp = bpf2a64[BPF_REG_FP];
- const u8 ra = bpf2a64[BPF_REG_A];
- const u8 rx = bpf2a64[BPF_REG_X];
const u8 tmp1 = bpf2a64[TMP_REG_1];
const u8 tmp2 = bpf2a64[TMP_REG_2];
@@ -200,10 +198,6 @@ static void build_prologue(struct jit_ctx *ctx)
/* Set up function call stack */
emit(A64_SUB_I(1, A64_SP, A64_SP, STACK_SIZE), ctx);
-
- /* Clear registers A and X */
- emit_a64_mov_i64(ra, 0, ctx);
- emit_a64_mov_i64(rx, 0, ctx);
}
static void build_epilogue(struct jit_ctx *ctx)
diff --git a/arch/powerpc/include/asm/hvcall.h b/arch/powerpc/include/asm/hvcall.h
index 85bc8c0..e3b54dd 100644
--- a/arch/powerpc/include/asm/hvcall.h
+++ b/arch/powerpc/include/asm/hvcall.h
@@ -258,11 +258,16 @@
#define H_DEL_CONN 0x288
#define H_JOIN 0x298
#define H_VASI_STATE 0x2A4
+#define H_VIOCTL 0x2A8
#define H_ENABLE_CRQ 0x2B0
#define H_GET_EM_PARMS 0x2B8
#define H_SET_MPP 0x2D0
#define H_GET_MPP 0x2D4
+#define H_REG_SUB_CRQ 0x2DC
#define H_HOME_NODE_ASSOCIATIVITY 0x2EC
+#define H_FREE_SUB_CRQ 0x2E0
+#define H_SEND_SUB_CRQ 0x2E4
+#define H_SEND_SUB_CRQ_INDIRECT 0x2E8
#define H_BEST_ENERGY 0x2F4
#define H_XIRR_X 0x2FC
#define H_RANDOM 0x300
@@ -271,6 +276,21 @@
#define H_SET_MODE 0x31C
#define MAX_HCALL_OPCODE H_SET_MODE
+/* H_VIOCTL functions */
+#define H_GET_VIOA_DUMP_SIZE 0x01
+#define H_GET_VIOA_DUMP 0x02
+#define H_GET_ILLAN_NUM_VLAN_IDS 0x03
+#define H_GET_ILLAN_VLAN_ID_LIST 0x04
+#define H_GET_ILLAN_SWITCH_ID 0x05
+#define H_DISABLE_MIGRATION 0x06
+#define H_ENABLE_MIGRATION 0x07
+#define H_GET_PARTNER_INFO 0x08
+#define H_GET_PARTNER_WWPN_LIST 0x09
+#define H_DISABLE_ALL_VIO_INTS 0x0A
+#define H_DISABLE_VIO_INTERRUPT 0x0B
+#define H_ENABLE_VIO_INTERRUPT 0x0C
+
+
/* Platform specific hcalls, used by KVM */
#define H_RTAS 0xf000
diff --git a/arch/s390/net/bpf_jit_comp.c b/arch/s390/net/bpf_jit_comp.c
index 9a0c4c2..3c0bfc1 100644
--- a/arch/s390/net/bpf_jit_comp.c
+++ b/arch/s390/net/bpf_jit_comp.c
@@ -408,7 +408,7 @@ static void emit_load_skb_data_hlen(struct bpf_jit *jit)
* Save registers and create stack frame if necessary.
* See stack frame layout desription in "bpf_jit.h"!
*/
-static void bpf_jit_prologue(struct bpf_jit *jit, bool is_classic)
+static void bpf_jit_prologue(struct bpf_jit *jit)
{
if (jit->seen & SEEN_TAIL_CALL) {
/* xc STK_OFF_TCCNT(4,%r15),STK_OFF_TCCNT(%r15) */
@@ -448,15 +448,6 @@ static void bpf_jit_prologue(struct bpf_jit *jit, bool is_classic)
/* stg %b1,ST_OFF_SKBP(%r0,%r15) */
EMIT6_DISP_LH(0xe3000000, 0x0024, REG_W1, REG_0, REG_15,
STK_OFF_SKBP);
- /* Clear A (%b0) and X (%b7) registers for converted BPF programs */
- if (is_classic) {
- if (REG_SEEN(BPF_REG_A))
- /* lghi %ba,0 */
- EMIT4_IMM(0xa7090000, BPF_REG_A, 0);
- if (REG_SEEN(BPF_REG_X))
- /* lghi %bx,0 */
- EMIT4_IMM(0xa7090000, BPF_REG_X, 0);
- }
}
/*
@@ -1245,7 +1236,7 @@ static int bpf_jit_prog(struct bpf_jit *jit, struct bpf_prog *fp)
jit->lit = jit->lit_start;
jit->prg = 0;
- bpf_jit_prologue(jit, bpf_prog_was_classic(fp));
+ bpf_jit_prologue(jit);
for (i = 0; i < fp->len; i += insn_count) {
insn_count = bpf_jit_insn(jit, fp, i);
if (insn_count < 0)
diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c
index 7599197..4286f36 100644
--- a/arch/x86/net/bpf_jit_comp.c
+++ b/arch/x86/net/bpf_jit_comp.c
@@ -193,7 +193,7 @@ struct jit_context {
32 /* space for rbx, r13, r14, r15 */ + \
8 /* space for skb_copy_bits() buffer */)
-#define PROLOGUE_SIZE 51
+#define PROLOGUE_SIZE 48
/* emit x64 prologue code for BPF program and check it's size.
* bpf_tail_call helper will skip it while jumping into another program
@@ -229,11 +229,15 @@ static void emit_prologue(u8 **pprog)
/* mov qword ptr [rbp-X],r15 */
EMIT3_off32(0x4C, 0x89, 0xBD, -STACKSIZE + 24);
- /* clear A and X registers */
- EMIT2(0x31, 0xc0); /* xor eax, eax */
- EMIT3(0x4D, 0x31, 0xED); /* xor r13, r13 */
+ /* Clear the tail call counter (tail_call_cnt): for eBPF tail calls
+ * we need to reset the counter to 0. It's done in two instructions,
+ * resetting rax register to 0 (xor on eax gets 0 extended), and
+ * moving it to the counter location.
+ */
- /* clear tail_cnt: mov qword ptr [rbp-X], rax */
+ /* xor eax, eax */
+ EMIT2(0x31, 0xc0);
+ /* mov qword ptr [rbp-X], rax */
EMIT3_off32(0x48, 0x89, 0x85, -STACKSIZE + 32);
BUILD_BUG_ON(cnt != PROLOGUE_SIZE);
@@ -455,6 +459,18 @@ static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image,
}
case BPF_ALU | BPF_MOV | BPF_K:
+ /* optimization: if imm32 is zero, use 'xor <dst>,<dst>'
+ * to save 3 bytes.
+ */
+ if (imm32 == 0) {
+ if (is_ereg(dst_reg))
+ EMIT1(add_2mod(0x40, dst_reg, dst_reg));
+ b2 = 0x31; /* xor */
+ b3 = 0xC0;
+ EMIT2(b2, add_2reg(b3, dst_reg, dst_reg));
+ break;
+ }
+
/* mov %eax, imm32 */
if (is_ereg(dst_reg))
EMIT1(add_1mod(0x40, dst_reg));
@@ -469,6 +485,20 @@ static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image,
return -EINVAL;
}
+ /* optimization: if imm64 is zero, use 'xor <dst>,<dst>'
+ * to save 7 bytes.
+ */
+ if (insn[0].imm == 0 && insn[1].imm == 0) {
+ b1 = add_2mod(0x48, dst_reg, dst_reg);
+ b2 = 0x31; /* xor */
+ b3 = 0xC0;
+ EMIT3(b1, b2, add_2reg(b3, dst_reg, dst_reg));
+
+ insn++;
+ i++;
+ break;
+ }
+
/* movabsq %rax, imm64 */
EMIT2(add_1mod(0x48, dst_reg), add_1reg(0xB8, dst_reg));
EMIT(insn[0].imm, 4);
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