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host/include/i386: Implement clmul.h

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Detect PCLMUL in cpuinfo; implement the accel hook.

Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2023-07-11 21:39:10 +01:00
parent 7bdbf233d9
commit d6493dbb46
5 changed files with 35 additions and 0 deletions
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1
host/include/i386/host/cpuinfo.h
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@ -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;

29
host/include/i386/host/crypto/clmul.h Normal file
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@ -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 */

1
host/include/x86_64/host/crypto/clmul.h Normal file
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@ -0,0 +1 @@
#include "host/include/i386/host/crypto/clmul.h"

3
include/qemu/cpuid.h
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@ -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

1
util/cpuinfo-i386.c
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@ -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);