24 lines
1.1 KiB
Diff
24 lines
1.1 KiB
Diff
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r3197 | mjw | 2015-10-01 14:31:19 +0200 (Do, 01. Okt 2015) | 5 Zeilen
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Don't advertise RDRAND in cpuid for Core-i7-4910-like avx2 machine.
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Bug#353370. In amd64g_dirtyhelper_CPUID_avx2 we set the RDRAND bit
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but we don't implement support for RDRAND. Turn the bit off so programs
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don't try to use RDRAND when running under valgrind.
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------------------------------------------------------------------------
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Index: priv/guest_amd64_helpers.c
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===================================================================
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--- VEX/priv/guest_amd64_helpers.c (Revision 3196)
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+++ VEX/priv/guest_amd64_helpers.c (Revision 3197)
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@@ -3101,7 +3101,8 @@ void amd64g_dirtyhelper_CPUID_avx2 ( Vex
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SET_ABCD(0x0000000d, 0x756e6547, 0x6c65746e, 0x49656e69);
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break;
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case 0x00000001:
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- SET_ABCD(0x000306c3, 0x02100800, 0x7ffafbff, 0xbfebfbff);
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+ /* Don't advertise RDRAND support, bit 30 in ECX. */
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+ SET_ABCD(0x000306c3, 0x02100800, 0x3ffafbff, 0xbfebfbff);
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break;
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case 0x00000002:
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SET_ABCD(0x76036301, 0x00f0b6ff, 0x00000000, 0x00c10000);
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