[PULL 18/19] host/include/i386: Implement clmul.h

Richard Henderson posted 19 patches 1 year, 1 month ago
Maintainers: "Daniel P. Berrangé" <berrange@redhat.com>, Richard Henderson <richard.henderson@linaro.org>, Paolo Bonzini <pbonzini@redhat.com>, Peter Maydell <peter.maydell@linaro.org>, Daniel Henrique Barboza <danielhb413@gmail.com>, "Cédric Le Goater" <clg@kaod.org>, David Gibson <david@gibson.dropbear.id.au>, Greg Kurz <groug@kaod.org>, Nicholas Piggin <npiggin@gmail.com>, David Hildenbrand <david@redhat.com>, Ilya Leoshkevich <iii@linux.ibm.com>, Thomas Huth <thuth@redhat.com>
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[PULL 18/19] host/include/i386: Implement clmul.h
Posted by Richard Henderson 1 year, 1 month ago
Detect PCLMUL in cpuinfo; implement the accel hook.

Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 host/include/i386/host/cpuinfo.h        |  1 +
 host/include/i386/host/crypto/clmul.h   | 29 +++++++++++++++++++++++++
 host/include/x86_64/host/crypto/clmul.h |  1 +
 include/qemu/cpuid.h                    |  3 +++
 util/cpuinfo-i386.c                     |  1 +
 5 files changed, 35 insertions(+)
 create mode 100644 host/include/i386/host/crypto/clmul.h
 create mode 100644 host/include/x86_64/host/crypto/clmul.h

diff --git a/host/include/i386/host/cpuinfo.h b/host/include/i386/host/cpuinfo.h
index 073d0a426f..7ae21568f7 100644
--- a/host/include/i386/host/cpuinfo.h
+++ b/host/include/i386/host/cpuinfo.h
@@ -27,6 +27,7 @@
 #define CPUINFO_ATOMIC_VMOVDQA  (1u << 16)
 #define CPUINFO_ATOMIC_VMOVDQU  (1u << 17)
 #define CPUINFO_AES             (1u << 18)
+#define CPUINFO_PCLMUL          (1u << 19)
 
 /* Initialized with a constructor. */
 extern unsigned cpuinfo;
diff --git a/host/include/i386/host/crypto/clmul.h b/host/include/i386/host/crypto/clmul.h
new file mode 100644
index 0000000000..dc3c814797
--- /dev/null
+++ b/host/include/i386/host/crypto/clmul.h
@@ -0,0 +1,29 @@
+/*
+ * x86 specific clmul acceleration.
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#ifndef X86_HOST_CRYPTO_CLMUL_H
+#define X86_HOST_CRYPTO_CLMUL_H
+
+#include "host/cpuinfo.h"
+#include <immintrin.h>
+
+#if defined(__PCLMUL__)
+# define HAVE_CLMUL_ACCEL  true
+# define ATTR_CLMUL_ACCEL
+#else
+# define HAVE_CLMUL_ACCEL  likely(cpuinfo & CPUINFO_PCLMUL)
+# define ATTR_CLMUL_ACCEL  __attribute__((target("pclmul")))
+#endif
+
+static inline Int128 ATTR_CLMUL_ACCEL
+clmul_64_accel(uint64_t n, uint64_t m)
+{
+    union { __m128i v; Int128 s; } u;
+
+    u.v = _mm_clmulepi64_si128(_mm_set_epi64x(0, n), _mm_set_epi64x(0, m), 0);
+    return u.s;
+}
+
+#endif /* X86_HOST_CRYPTO_CLMUL_H */
diff --git a/host/include/x86_64/host/crypto/clmul.h b/host/include/x86_64/host/crypto/clmul.h
new file mode 100644
index 0000000000..f25eced416
--- /dev/null
+++ b/host/include/x86_64/host/crypto/clmul.h
@@ -0,0 +1 @@
+#include "host/include/i386/host/crypto/clmul.h"
diff --git a/include/qemu/cpuid.h b/include/qemu/cpuid.h
index 35325f1995..b11161555b 100644
--- a/include/qemu/cpuid.h
+++ b/include/qemu/cpuid.h
@@ -25,6 +25,9 @@
 #endif
 
 /* Leaf 1, %ecx */
+#ifndef bit_PCLMUL
+#define bit_PCLMUL      (1 << 1)
+#endif
 #ifndef bit_SSE4_1
 #define bit_SSE4_1      (1 << 19)
 #endif
diff --git a/util/cpuinfo-i386.c b/util/cpuinfo-i386.c
index b2ed65bb10..9fddb18303 100644
--- a/util/cpuinfo-i386.c
+++ b/util/cpuinfo-i386.c
@@ -39,6 +39,7 @@ unsigned __attribute__((constructor)) cpuinfo_init(void)
         info |= (c & bit_SSE4_1 ? CPUINFO_SSE4 : 0);
         info |= (c & bit_MOVBE ? CPUINFO_MOVBE : 0);
         info |= (c & bit_POPCNT ? CPUINFO_POPCNT : 0);
+        info |= (c & bit_PCLMUL ? CPUINFO_PCLMUL : 0);
 
         /* Our AES support requires PSHUFB as well. */
         info |= ((c & bit_AES) && (c & bit_SSSE3) ? CPUINFO_AES : 0);
-- 
2.34.1