Date: Tue, 25 Mar 2014 20:16:28 +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-10@freebsd.org Subject: svn commit: r263746 - stable/10/sys/x86/iommu Message-ID: <201403252016.s2PKGSiv073212@svn.freebsd.org>
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Author: kib Date: Tue Mar 25 20:16:28 2014 New Revision: 263746 URL: http://svnweb.freebsd.org/changeset/base/263746 Log: MFC r263305: Provide a workaround by identity mapping the 32 pages after the bogus entry start, which seems to be enough for the reported BIOS. Modified: stable/10/sys/x86/iommu/intel_ctx.c Directory Properties: stable/10/ (props changed) Modified: stable/10/sys/x86/iommu/intel_ctx.c ============================================================================== --- stable/10/sys/x86/iommu/intel_ctx.c Tue Mar 25 19:28:40 2014 (r263745) +++ stable/10/sys/x86/iommu/intel_ctx.c Tue Mar 25 20:16:28 2014 (r263746) @@ -182,6 +182,15 @@ ctx_init_rmrr(struct dmar_ctx *ctx, devi end = entry->end; entry->start = trunc_page(start); entry->end = round_page(end); + if (entry->start == entry->end) { + /* Workaround for some AMI (?) BIOSes */ + if (bootverbose) { + device_printf(dev, "BIOS bug: dmar%d RMRR " + "region (%jx, %jx) corrected\n", + ctx->dmar->unit, start, end); + } + entry->end += DMAR_PAGE_SIZE * 0x20; + } size = OFF_TO_IDX(entry->end - entry->start); ma = malloc(sizeof(vm_page_t) * size, M_TEMP, M_WAITOK); for (i = 0; i < size; i++) {
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