linux-kernel - [PATCH] crypto: vmx - comply with ABIs that specify vrsave as reserved.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu,  5 May 2016 11:09:27 -0300
From:	Paulo Flabiano Smorigo <pfsmorigo@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	Paulo Flabiano Smorigo <pfsmorigo@...ux.vnet.ibm.com>,
	"Leonidas S. Barbosa" <leosilva@...ux.vnet.ibm.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>,
	linux-crypto@...r.kernel.org (open list:IBM Power VMX Cryptographic
	instructions)
Subject: [PATCH] crypto: vmx - comply with ABIs that specify vrsave as reserved.

It gives significant improvements ( ~+15%) on some modes.

These code has been adopted from OpenSSL project in collaboration
with the original author (Andy Polyakov <appro@...nssl.org>).

Signed-off-by: Paulo Flabiano Smorigo <pfsmorigo@...ux.vnet.ibm.com>
---
 drivers/crypto/vmx/ppc-xlate.pl | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/crypto/vmx/ppc-xlate.pl b/drivers/crypto/vmx/ppc-xlate.pl
index b999733..9f4994c 100644
--- a/drivers/crypto/vmx/ppc-xlate.pl
+++ b/drivers/crypto/vmx/ppc-xlate.pl
@@ -139,6 +139,26 @@ my $vmr = sub {
     "	vor	$vx,$vy,$vy";
 };
 
+# Some ABIs specify vrsave, special-purpose register #256, as reserved
+# for system use.
+my $no_vrsave = ($flavour =~ /aix|linux64le/);
+my $mtspr = sub {
+    my ($f,$idx,$ra) = @_;
+    if ($idx == 256 && $no_vrsave) {
+	"	or	$ra,$ra,$ra";
+    } else {
+	"	mtspr	$idx,$ra";
+    }
+};
+my $mfspr = sub {
+    my ($f,$rd,$idx) = @_;
+    if ($idx == 256 && $no_vrsave) {
+	"	li	$rd,-1";
+    } else {
+	"	mfspr	$rd,$idx";
+    }
+};
+
 # PowerISA 2.06 stuff
 sub vsxmem_op {
     my ($f, $vrt, $ra, $rb, $op) = @_;
-- 
2.5.5