git: 1d21f6414922 - main - bhyve: Implement MSR_MISC_FEATURES_ENABLES

The branch main has been updated by imp:

URL: https://cgit.FreeBSD.org/src/commit/?id=1d21f64149224000d74e0c850686e85aefd25ef9

commit 1d21f64149224000d74e0c850686e85aefd25ef9
Author:     Warner Losh <imp@FreeBSD.org>
AuthorDate: 2022-10-27 17:32:18 +0000
Commit:     Warner Losh <imp@FreeBSD.org>
CommitDate: 2022-10-27 17:34:41 +0000

    bhyve: Implement MSR_MISC_FEATURES_ENABLES
    
    Linux reads MISC_FEATURES_ENABLES to manage the CPUID faulting feature
    (undocumented in the Intel SDM, but documented in 323850-004 (Intel
    Virtualization Technology FlexMigration Application Note). Since bhyve
    doesn't emulate this feature, we always return 0. Neither does bhyve
    support the MONITOR/MWAIT fault bit also in this MSR (which is
    documented in the sdm), so always return 0.
    
    Sponsored by:           Netflix
    Reviewed by:            jhb
    Differential Revision:  https://reviews.freebsd.org/D36602
---
 sys/x86/include/specialreg.h | 1 +
 usr.sbin/bhyve/xmsr.c        | 1 +
 2 files changed, 2 insertions(+)

diff --git a/sys/x86/include/specialreg.h b/sys/x86/include/specialreg.h
index ddac2b9ea2b2..0185317dbd38 100644
--- a/sys/x86/include/specialreg.h
+++ b/sys/x86/include/specialreg.h
@@ -559,6 +559,7 @@
 #define	MSR_BBL_CR_CTL3		0x11e
 #define	MSR_IA32_TSX_CTRL	0x122
 #define	MSR_IA32_MCU_OPT_CTRL	0x123
+#define	MSR_MISC_FEATURE_ENABLES	0x140
 #define	MSR_SYSENTER_CS_MSR	0x174
 #define	MSR_SYSENTER_ESP_MSR	0x175
 #define	MSR_SYSENTER_EIP_MSR	0x176
diff --git a/usr.sbin/bhyve/xmsr.c b/usr.sbin/bhyve/xmsr.c
index 563743dd05b4..5f735152e92c 100644
--- a/usr.sbin/bhyve/xmsr.c
+++ b/usr.sbin/bhyve/xmsr.c
@@ -117,6 +117,7 @@ emulate_rdmsr(struct vmctx *ctx __unused, int vcpu __unused, uint32_t num,
 		case MSR_PP0_ENERGY_STATUS:
 		case MSR_PP1_ENERGY_STATUS:
 		case MSR_DRAM_ENERGY_STATUS:
+		case MSR_MISC_FEATURE_ENABLES:
 			*val = 0;
 			break;
 		case MSR_RAPL_POWER_UNIT: