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Do not call hw_mds_recalculate() from initializecpu().

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If MDS mitigation is enabled by the tunable but MDS microcode is not
early-loaded, software mitigation is selected.  This causes
initializecpu() to try to allocate memory which makes boot process
very unhappy.

Create SYSINIT that runs sufficiently late to succeed.

Reported by:	naddy
PR:	237968
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
This commit is contained in:
Konstantin Belousov 2019-05-21 22:56:21 +00:00
parent bfc5d3f9c2
commit 48ec6d3bc9
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=348075
3 changed files with 8 additions and 2 deletions
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1
sys/amd64/amd64/initcpu.c
View File

@ -257,7 +257,6 @@ initializecpu(void)
hw_ibrs_recalculate();
hw_ssb_recalculate(false);
amd64_syscall_ret_flush_l1d_recalc();
hw_mds_recalculate();
switch (cpu_vendor_id) {
case CPU_VENDOR_AMD:
init_amd();

1
sys/i386/i386/initcpu.c
View File

@ -749,7 +749,6 @@ initializecpu(void)
msr = rdmsr(MSR_EFER) | EFER_NXE;
wrmsr(MSR_EFER, msr);
}
hw_mds_recalculate();
if ((amd_feature & AMDID_RDTSCP) != 0 ||
(cpu_stdext_feature2 & CPUID_STDEXT2_RDPID) != 0)
wrmsr(MSR_TSC_AUX, PCPU_GET(cpuid));

8
sys/x86/x86/cpu_machdep.c
View File

@ -1106,6 +1106,14 @@ hw_mds_recalculate(void)
}
}
static void
hw_mds_recalculate_boot(void *arg __unused)
{
hw_mds_recalculate();
}
SYSINIT(mds_recalc, SI_SUB_SMP, SI_ORDER_ANY, hw_mds_recalculate_boot, NULL);
static int
sysctl_mds_disable_handler(SYSCTL_HANDLER_ARGS)
{