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Emulate the AMD MSR_LS_CFG MSR used for various Ryzen errata.

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Writes are ignored and reads always return zero.

Submitted by:	José Albornoz <jojo@eljojo.net> (write-only version)
Reviewed by:	Patrick Mooney, cem
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D19506
This commit is contained in:
John Baldwin 2019-06-03 23:17:35 +00:00
parent c2ec111378
commit beb388db08
1 changed files with 2 additions and 0 deletions
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2
usr.sbin/bhyve/xmsr.c
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@ -72,6 +72,7 @@ emulate_wrmsr(struct vmctx *ctx, int vcpu, uint32_t num, uint64_t val)
return (0);
case MSR_NB_CFG1:
case MSR_LS_CFG:
case MSR_IC_CFG:
return (0); /* Ignore writes */
@ -141,6 +142,7 @@ emulate_rdmsr(struct vmctx *ctx, int vcpu, uint32_t num, uint64_t *val)
break;
case MSR_NB_CFG1:
case MSR_LS_CFG:
case MSR_IC_CFG:
/*
* The reset value is processor family dependent so