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SubjectRe: [PATCH 00/12] x86/crypto: Fix RBP usage in several crypto .S files
On Wed, Sep 13, 2017 at 04:24:28PM -0500, Josh Poimboeuf wrote:
> On Fri, Sep 08, 2017 at 10:57:05AM -0700, Eric Biggers wrote:
> > On Thu, Sep 07, 2017 at 11:26:47PM +0200, Ingo Molnar wrote:
> > >
> > > * Eric Biggers <ebiggers3@gmail.com> wrote:
> > >
> > > > On Thu, Sep 07, 2017 at 09:15:34AM +0200, Ingo Molnar wrote:
> > > > >
> > > > > * Eric Biggers <ebiggers3@gmail.com> wrote:
> > > > >
> > > > > > Thanks for fixing these! I don't have time to review these in detail, but I ran
> > > > > > the crypto self-tests on the affected algorithms, and they all pass. I also
> > > > > > benchmarked them before and after; the only noticable performance difference was
> > > > > > that sha256-avx2 and sha512-avx2 became a few percent slower. I don't suppose
> > > > > > there is a way around that? Otherwise it's probably not a big deal.
> > > > >
> > > > > Which CPU model did you use for the test?
> > > > >
> > > > > Thanks,
> > > > >
> > > > > Ingo
> > > >
> > > > This was on Haswell, "Intel(R) Xeon(R) CPU E5-1650 v3 @ 3.50GHz".
> > >
> > > Any chance to test this with the latest microarchitecture - any Skylake derivative
> > > Intel CPU you have access to?
> > >
> > > Thanks,
> > >
> > > Ingo
> >
> > Tested with Skylake, "Intel(R) Core(TM) i5-6200U CPU @ 2.30GHz". The results
> > were the following which seemed a bit worse than Haswell:
> >
> > sha256-avx2 became 3.5% slower
> > sha512-avx2 became 7.5% slower
> >
> > Note: it's tricky to benchmark this, especially with just a few percent
> > difference, so don't read too much into the exact numbers.
>
> Here's a v2 for the sha256-avx2 patch, would you mind seeing if this
> closes the performance gap?
>
> I'm still looking at the other one (sha512-avx2), but so far I haven't
> found a way to speed it back up.

And here's v2 of the sha512-avx2 patch. It should hopefully gain back
most of the performance lost by v1.

From: Josh Poimboeuf <jpoimboe@redhat.com>
Subject: [PATCH] x86/crypto: Fix RBP usage in sha512-avx2-asm.S

Using RBP as a temporary register breaks frame pointer convention and
breaks stack traces when unwinding from an interrupt in the crypto code.

Mix things up a little bit to get rid of the RBP usage, without
destroying performance. Use RDI instead of RBP for the TBL pointer.
That will clobber CTX, so save CTX on the stack and use RDI as CTX
before it gets clobbered, and R12 as CTX after it gets clobbered.

Also remove the unused y4 variable.

Reported-by: Eric Biggers <ebiggers3@gmail.com>
Reported-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
---
arch/x86/crypto/sha512-avx2-asm.S | 75 ++++++++++++++++++++-------------------
1 file changed, 39 insertions(+), 36 deletions(-)

diff --git a/arch/x86/crypto/sha512-avx2-asm.S b/arch/x86/crypto/sha512-avx2-asm.S
index 7f5f6c6ec72e..b16d56005162 100644
--- a/arch/x86/crypto/sha512-avx2-asm.S
+++ b/arch/x86/crypto/sha512-avx2-asm.S
@@ -69,8 +69,9 @@ XFER = YTMP0

BYTE_FLIP_MASK = %ymm9

-# 1st arg
-CTX = %rdi
+# 1st arg is %rdi, which is saved to the stack and accessed later via %r12
+CTX1 = %rdi
+CTX2 = %r12
# 2nd arg
INP = %rsi
# 3rd arg
@@ -81,7 +82,7 @@ d = %r8
e = %rdx
y3 = %rsi

-TBL = %rbp
+TBL = %rdi # clobbers CTX1

a = %rax
b = %rbx
@@ -91,26 +92,26 @@ g = %r10
h = %r11
old_h = %r11

-T1 = %r12
+T1 = %r12 # clobbers CTX2
y0 = %r13
y1 = %r14
y2 = %r15

-y4 = %r12
-
# Local variables (stack frame)
XFER_SIZE = 4*8
SRND_SIZE = 1*8
INP_SIZE = 1*8
INPEND_SIZE = 1*8
+CTX_SIZE = 1*8
RSPSAVE_SIZE = 1*8
-GPRSAVE_SIZE = 6*8
+GPRSAVE_SIZE = 5*8

frame_XFER = 0
frame_SRND = frame_XFER + XFER_SIZE
frame_INP = frame_SRND + SRND_SIZE
frame_INPEND = frame_INP + INP_SIZE
-frame_RSPSAVE = frame_INPEND + INPEND_SIZE
+frame_CTX = frame_INPEND + INPEND_SIZE
+frame_RSPSAVE = frame_CTX + CTX_SIZE
frame_GPRSAVE = frame_RSPSAVE + RSPSAVE_SIZE
frame_size = frame_GPRSAVE + GPRSAVE_SIZE

@@ -576,12 +577,11 @@ ENTRY(sha512_transform_rorx)
mov %rax, frame_RSPSAVE(%rsp)

# Save GPRs
- mov %rbp, frame_GPRSAVE(%rsp)
- mov %rbx, 8*1+frame_GPRSAVE(%rsp)
- mov %r12, 8*2+frame_GPRSAVE(%rsp)
- mov %r13, 8*3+frame_GPRSAVE(%rsp)
- mov %r14, 8*4+frame_GPRSAVE(%rsp)
- mov %r15, 8*5+frame_GPRSAVE(%rsp)
+ mov %rbx, 8*0+frame_GPRSAVE(%rsp)
+ mov %r12, 8*1+frame_GPRSAVE(%rsp)
+ mov %r13, 8*2+frame_GPRSAVE(%rsp)
+ mov %r14, 8*3+frame_GPRSAVE(%rsp)
+ mov %r15, 8*4+frame_GPRSAVE(%rsp)

shl $7, NUM_BLKS # convert to bytes
jz done_hash
@@ -589,14 +589,17 @@ ENTRY(sha512_transform_rorx)
mov NUM_BLKS, frame_INPEND(%rsp)

## load initial digest
- mov 8*0(CTX),a
- mov 8*1(CTX),b
- mov 8*2(CTX),c
- mov 8*3(CTX),d
- mov 8*4(CTX),e
- mov 8*5(CTX),f
- mov 8*6(CTX),g
- mov 8*7(CTX),h
+ mov 8*0(CTX1), a
+ mov 8*1(CTX1), b
+ mov 8*2(CTX1), c
+ mov 8*3(CTX1), d
+ mov 8*4(CTX1), e
+ mov 8*5(CTX1), f
+ mov 8*6(CTX1), g
+ mov 8*7(CTX1), h
+
+ # save %rdi (CTX) before it gets clobbered
+ mov %rdi, frame_CTX(%rsp)

vmovdqa PSHUFFLE_BYTE_FLIP_MASK(%rip), BYTE_FLIP_MASK

@@ -652,14 +655,15 @@ loop2:
subq $1, frame_SRND(%rsp)
jne loop2

- addm 8*0(CTX),a
- addm 8*1(CTX),b
- addm 8*2(CTX),c
- addm 8*3(CTX),d
- addm 8*4(CTX),e
- addm 8*5(CTX),f
- addm 8*6(CTX),g
- addm 8*7(CTX),h
+ mov frame_CTX(%rsp), CTX2
+ addm 8*0(CTX2), a
+ addm 8*1(CTX2), b
+ addm 8*2(CTX2), c
+ addm 8*3(CTX2), d
+ addm 8*4(CTX2), e
+ addm 8*5(CTX2), f
+ addm 8*6(CTX2), g
+ addm 8*7(CTX2), h

mov frame_INP(%rsp), INP
add $128, INP
@@ -669,12 +673,11 @@ loop2:
done_hash:

# Restore GPRs
- mov frame_GPRSAVE(%rsp) ,%rbp
- mov 8*1+frame_GPRSAVE(%rsp) ,%rbx
- mov 8*2+frame_GPRSAVE(%rsp) ,%r12
- mov 8*3+frame_GPRSAVE(%rsp) ,%r13
- mov 8*4+frame_GPRSAVE(%rsp) ,%r14
- mov 8*5+frame_GPRSAVE(%rsp) ,%r15
+ mov 8*0+frame_GPRSAVE(%rsp), %rbx
+ mov 8*1+frame_GPRSAVE(%rsp), %r12
+ mov 8*2+frame_GPRSAVE(%rsp), %r13
+ mov 8*3+frame_GPRSAVE(%rsp), %r14
+ mov 8*4+frame_GPRSAVE(%rsp), %r15

# Restore Stack Pointer
mov frame_RSPSAVE(%rsp), %rsp
--
2.13.5
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