Date: Mon, 18 Nov 2019 13:38:35 +0000 (UTC) From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-12@freebsd.org Subject: svn commit: r354811 - stable/12/sys/amd64/amd64 Message-ID: <201911181338.xAIDcZ5M068841@repo.freebsd.org>
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Author: kib Date: Mon Nov 18 13:38:35 2019 New Revision: 354811 URL: https://svnweb.freebsd.org/changeset/base/354811 Log: MFC r354630: amd64: Issue MFENCE on context switch on AMD CPUs when reusing address space. Modified: stable/12/sys/amd64/amd64/pmap.c Directory Properties: stable/12/ (props changed) Modified: stable/12/sys/amd64/amd64/pmap.c ============================================================================== --- stable/12/sys/amd64/amd64/pmap.c Mon Nov 18 13:37:13 2019 (r354810) +++ stable/12/sys/amd64/amd64/pmap.c Mon Nov 18 13:38:35 2019 (r354811) @@ -8592,8 +8592,11 @@ pmap_activate_sw(struct thread *td) oldpmap = PCPU_GET(curpmap); pmap = vmspace_pmap(td->td_proc->p_vmspace); - if (oldpmap == pmap) + if (oldpmap == pmap) { + if (cpu_vendor_id != CPU_VENDOR_INTEL) + mfence(); return; + } cpuid = PCPU_GET(cpuid); #ifdef SMP CPU_SET_ATOMIC(cpuid, &pmap->pm_active);
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