Mercurial > illumos > git > illumos-joyent
diff usr/src/uts/intel/sys/controlregs.h @ 25257:b821679919bb
12999 MSR_AMD_DE_CFG is twice defined
Reviewed by: Robert Mustacchi <rm@fingolfin.org>
Approved by: Dan McDonald <danmcd@joyent.com>
| author | Patrick Mooney <pmooney@pfmooney.com> |
|---|---|
| date | Wed, 29 Jul 2020 22:37:40 +0000 |
| parents | 654bceb67d77 |
| children | 30063115dff3 |
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--- a/usr/src/uts/intel/sys/controlregs.h Tue Jul 28 20:24:52 2020 +0000 +++ b/usr/src/uts/intel/sys/controlregs.h Wed Jul 29 22:37:40 2020 +0000 @@ -238,9 +238,15 @@ #define AMD_BU_CFG_E298 (UINT64_C(1) << 1) +/* + * This MSR exists on families, 10h, 12h+ for AMD. This controls instruction + * decoding. Most notably, for the AMD variant of retpolines, we must improve + * the serializability of lfence for the lfence based method to work. + */ #define MSR_AMD_DE_CFG 0xc0011029 -#define AMD_DE_CFG_E721 (UINT64_C(1)) +#define AMD_DE_CFG_E721 (1UL << 0) +#define AMD_DE_CFG_LFENCE_DISPATCH (1UL << 1) /* AMD's osvw MSRs */ #define MSR_AMD_OSVW_ID_LEN 0xc0010140