Date: Fri, 11 Aug 2017 07:29:50 +0000 (UTC) From: Ed Schouten <ed@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org Subject: svn commit: r322394 - stable/11/sys/amd64/cloudabi64 Message-ID: <201708110729.v7B7ToBI049571@repo.freebsd.org>
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Author: ed Date: Fri Aug 11 07:29:50 2017 New Revision: 322394 URL: https://svnweb.freebsd.org/changeset/base/322394 Log: MFC r321924: Keep top page on CloudABI to work around AMD Ryzen stability issues. Similar to r321899, reduce sv_maxuser by one page inside of CloudABI. This ensures that the stack, the vDSO and any allocations cannot touch the top page of user virtual memory. Considering that CloudABI userspace is completely oblivious to virtual memory layout, don't bother making this conditional based on the CPU of the running system. Modified: stable/11/sys/amd64/cloudabi64/cloudabi64_sysvec.c Directory Properties: stable/11/ (props changed) Modified: stable/11/sys/amd64/cloudabi64/cloudabi64_sysvec.c ============================================================================== --- stable/11/sys/amd64/cloudabi64/cloudabi64_sysvec.c Fri Aug 11 07:27:55 2017 (r322393) +++ stable/11/sys/amd64/cloudabi64/cloudabi64_sysvec.c Fri Aug 11 07:29:50 2017 (r322394) @@ -199,7 +199,8 @@ static struct sysentvec cloudabi64_elf_sysvec = { .sv_coredump = elf64_coredump, .sv_pagesize = PAGE_SIZE, .sv_minuser = VM_MIN_ADDRESS, - .sv_maxuser = VM_MAXUSER_ADDRESS, + /* Keep top page reserved to work around AMD Ryzen stability issues. */ + .sv_maxuser = VM_MAXUSER_ADDRESS - PAGE_SIZE, .sv_stackprot = VM_PROT_READ | VM_PROT_WRITE, .sv_copyout_strings = cloudabi64_copyout_strings, .sv_setregs = cloudabi64_proc_setregs,
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