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d1bd157fbc
This changeset contains all differences between xen-unstable.hg and xen-unstable-hvm.hg. All information and comments for changesets unique to xen-unstable-hvm.hg are included below. Signed-off-by: Leendert van Doorn <leendert@watson.ibm.com> Signed-off-by: Keir Fraser <keir@xensource.com> > user: leendert@eserver2.watson.ibm.com > date: Tue Jan 31 04:29:51 2006 -0400 > files: xen/include/asm-ia64/mm.h > description: > Fix ia64 compile. > > Signed-off-by: Leendert van Doorn <leendert@watson.ibm.com> > > > user: leendert@eserver2.watson.ibm.com > date: Tue Jan 31 02:21:49 2006 -0400 > files: xen/include/xen/domain_page.h > description: > Eliminate unused fields (pfn,va) warnings. > > Signed-Off-By: Leendert van Doorn <leendert@watson.ibm.com> > > > user: leendert@eserver2.watson.ibm.com > date: Fri Jan 27 04:31:44 2006 -0400 > files: tools/python/xen/xend/image.py > description: > Name cleanup. vmx refers to VT-x specific code, HVM is used for all others. > > Signed-off-by: Leendert van Doorn <leendert@watson.ibm.com> > > > user: root@xen-trw1.amd.com > date: Sun Jan 22 18:39:58 2006 -0500 > files: xen/arch/x86/hvm/platform.c > description: > support prefix 0x67 in hvm decode logic, gfxboot patch causes 0x67 prefix. > > > user: twoller@xen-trw1.amd.com > date: Sun Jan 22 18:35:59 2006 -0500 > files: xen/arch/x86/hvm/svm/svm.c xen/arch/x86/hvm/svm/vmcb.c xen/include/asm-x86/hvm/svm/svm.h > description: > check for valid shared_page_va/vmcb before deallocating in SVM. > > > user: leendert@eserver2.watson.ibm.com > date: Sun Jan 22 02:56:20 2006 -0400 > files: xen/include/asm-x86/hvm/svm/svm.h xen/include/asm-x86/hvm/svm/vmmcall.h > description: > Some SVM header file cleanups. > > Signed-off-by: Leendert van Doorn <leendert@watson.ibm.com> > > > user: leendert@eserver2.watson.ibm.com > date: Fri Jan 20 11:50:23 2006 -0400 > files: xen/arch/x86/domain.c > description: > Need to be more diligent about when to call into the HVM abstraction layer > and when not. > > Signed-Off-By: Leendert van Doorn <leendert@watson.ibm.com> > > > user: leendert@eserver2.watson.ibm.com > date: Wed Jan 18 15:14:56 2006 -0400 > files: xen/arch/x86/hvm/svm/svm.c xen/arch/x86/hvm/svm/x86_32/exits.S xen/arch/x86/hvm/svm/x86_64/exits.S xen/arch/x86/hvm/vmx/x86_32/exits.S xen/arch/x86/hvm/vmx/x86_64/exits.S > description: > Added missing copyright statements and updated svm.c's copyright to properly > reflect that it was derived from vmx.c. > > Signed-Off-By: Leendert van Doorn <leendert@watson.ibm.com> > > > user: leendert@eserver2.watson.ibm.com > date: Tue Jan 17 09:42:11 2006 -0400 > files: xen/arch/ia64/Makefile xen/arch/ia64/vmx/vlsapic.c xen/arch/ia64/vmx/vmx_init.c xen/include/asm-ia64/vmx_platform.h > description: > Make sure ia64 builds again with the new directory structure. > > Signed-off-by: Leendert van Doorn <leendert@watson.ibm.com> > > > user: leendert@localhost.localdomain > date: Tue Jan 17 08:28:51 2006 -0400 > files: xen/arch/x86/Makefile xen/arch/x86/hvm/i8259.c xen/arch/x86/hvm/vioapic.c > description: > The device models now belong in hvm. > > Signed-ff-by: Leendert van Doorn <leendert@watson.ibm.com> > > > user: leendert@eserver2.watson.ibm.com > date: Sun Jan 15 16:40:58 2006 -0400 > files: xen/arch/x86/Makefile xen/arch/x86/cpu/amd.c xen/arch/x86/cpu/intel.c xen/arch/x86/dm/hvm_vioapic.c xen/arch/x86/dm/i8259.c xen/arch/x86/dom0_ops.c xen/arch/x86/domain.c xen/arch/x86/hvm/hvm.c xen/arch/x86/hvm/intercept.c xen/arch/x86/hvm/io.c xen/arch/x86/hvm/platform.c xen/arch/x86/hvm/svm/emulate.c xen/arch/x86/hvm/svm/instrlen.c xen/arch/x86/hvm/svm/intr.c xen/arch/x86/hvm/svm/svm.c xen/arch/x86/hvm/svm/vmcb.c xen/arch/x86/hvm/svm/x86_32/exits.S xen/arch/x86/hvm/svm/x86_64/exits.S xen/arch/x86/hvm/vlapic.c xen/arch/x86/hvm/vmx/io.c xen/arch/x86/hvm/vmx/vmcs.c xen/arch/x86/hvm/vmx/vmx.c xen/arch/x86/hvm/vmx/x86_32/exits.S xen/arch/x86/hvm/vmx/x86_64/exits.S xen/arch/x86/i387.c xen/arch/x86/x86_32/entry.S xen/arch/x86/x86_32/traps.c xen/arch/x86/x86_64/entry.S xen/arch/x86/x86_64/traps.c xen/include/asm-x86/domain.h xen/include/asm-x86/hvm/domain.h xen/include/asm-x86/hvm/hvm.h xen/include/asm-x86/hvm/io.h xen/include/asm-x86/hvm/support.h xen/include/asm-x86/hvm/svm/emulate.h xen/include/asm-x86/hvm/svm/intr.h xen/include/asm-x86/hvm/svm/svm.h xen/include/asm-x86/hvm/svm/vmcb.h xen/include/asm-x86/hvm/svm/vmmcall.h xen/include/asm-x86/hvm/vcpu.h xen/include/asm-x86/hvm/vioapic.h xen/include/asm-x86/hvm/vlapic.h xen/include/asm-x86/hvm/vmx/cpu.h xen/include/asm-x86/hvm/vmx/vmcs.h xen/include/asm-x86/hvm/vmx/vmx.h xen/include/asm-x86/hvm/vpic.h xen/include/asm-x86/hvm/vpit.h xen/include/asm-x86/shadow.h > description: > As suggested by Keir, I restructured the hvm/vmx/svm tree. The new > directory structure looks like: > > xen/arch/hvm/ > xen/arch/hvm/vmx > xen/arch/hvm/vmx/x86_32 > xen/arch/hvm/vmx/x86_64 > xen/arch/hvm/svm > xen/arch/hvm/svm/x86_32 > xen/arch/hvm/svm/x86_64 > > xen/include/hvm/ > xen/include/hvm/vmx > xen/include/hvm/svm > > Many files have been renamed and had their hvm_/vmx_/svm_ suffix removed > because this is now clear from the directory where the file resides. > > Signed-off-by: Leendert van Doorn <leendert@watson.ibm.com> > > > user: leendert@eserver2.watson.ibm.com > date: Sat Jan 14 17:03:28 2006 -0400 > files: xen/arch/ia64/vmx/vlsapic.c xen/include/asm-ia64/vmx_platform.h > description: > Name change fix for ia64. > > Signed-off-by: Leendert van Doorn <leendert@watson.ibm.com> > > > user: leendert@eserver2.watson.ibm.com > date: Sat Jan 14 15:12:59 2006 -0400 > files: xen/arch/x86/dm/hvm_vioapic.c xen/arch/x86/dm/i8259.c xen/arch/x86/hvm.c xen/arch/x86/hvm_intercept.c xen/arch/x86/svm.c xen/arch/x86/svm_intr.c xen/arch/x86/svm_vmcb.c xen/arch/x86/vmx.c xen/arch/x86/vmx_io.c xen/arch/x86/vmx_vmcs.c xen/include/asm-x86/hvm_domain.h xen/include/asm-x86/hvm_vcpu.h > description: > Move VMX/SVM print buffer to hvm_domain. > > Cleanup variable names. The suffix hvm_ is redundant in hvm_domain. > > Signed-off-by: Leendert van Doorn <leendert@watson.ibm.com> > > > user: twoller@xen-trw1.site > date: Fri Jan 13 17:03:18 2006 -0500 > files: xen/arch/x86/svm.c > description: > remove unnecessary spin_unlock in asid_fetch code for svm. > > > user: twoller@xen-trw1.site > date: Wed Jan 11 20:00:36 2006 -0500 > files: xen/arch/x86/svm.c > description: > remove unneeded update_pagetables() during svm PF handling (resolved with ASID code rework). > > > user: leendert@eserver2.watson.ibm.com > date: Tue Jan 10 02:45:32 2006 -0400 > files: xen/arch/x86/hvm.c xen/arch/x86/vmx_io.c > description: > Factor out cpu_get_interrupt(). It is used by VMX and SVM. > > Signed-Off-By: Leendert van Doorn <leendert@watson.ibm.com> > > > user: leendert@eserver2.watson.ibm.com > date: Mon Jan 9 00:03:30 2006 -0400 > files: xen/arch/x86/hvm.c xen/arch/x86/svm.c xen/arch/x86/vmx.c xen/include/asm-x86/hvm_support.h xen/include/asm-x86/hvm_vcpu.h > description: > Introduce small print buffer per domain rather than a single global one. > > Signed-off-by: Leendert van Doorn <leendert@watson.ibm.com> > > > user: leendert@eserver2.watson.ibm.com > date: Sun Jan 8 23:07:12 2006 -0400 > files: xen/arch/x86/dom0_ops.c xen/include/asm-x86/hvm_support.h xen/include/public/arch-x86_32.h xen/include/public/arch-x86_64.h > description: > More cleanup. There is no point in distinguishing between SVM and VMX, > a single HVM flag bit suffices. > > Signed-Off-By: Leendert van Doorn <leendert@watson.ibm.com> > > > user: leendert@eserver2.watson.ibm.com > date: Sun Jan 8 12:05:59 2006 -0400 > files: xen/arch/x86/svm.c xen/arch/x86/vmx.c > description: > Both VMX & SVM now print writes to the debug port (0xE9) on the console. > > Signed-off-by: Leendert van Doorn <leendert@watson.ibm.com> > > > user: leendert@eserver2.watson.ibm.com > date: Sat Jan 7 13:55:27 2006 -0400 > files: xen/arch/x86/svm.c xen/arch/x86/svm_intr.c xen/arch/x86/svm_vmcb.c xen/arch/x86/vmx.c xen/arch/x86/vmx_io.c xen/arch/x86/vmx_vmcs.c xen/arch/x86/x86_32/asm-offsets.c xen/arch/x86/x86_64/asm-offsets.c xen/include/asm-x86/domain.h xen/include/asm-x86/vmx.h > description: > Introduce shorthands to improve code legibility. > > Signed-Off-By: Leendert van Doorn <leendert@watson.ibm.com> > > > user: leendert@eserver2.watson.ibm.com > date: Wed Jan 4 06:12:10 2006 -0400 > files: tools/examples/xmexample.hvm > description: > Minor spelling mistakes. > > Signed-off-by: Leendert van Doorn <leendert@watson.ibm.com> > > > user: leendert@eserver2.watson.ibm.com > date: Wed Jan 4 03:37:55 2006 -0400 > files: xen/include/public/hvm/hvm_info_table.h xen/include/public/hvm/ioreq.h xen/include/public/hvm/vmx_assist.h > description: > Missed adding new files. > > Signed-off-by: Leendert van Doorn <leendert@watson.ibm.com> > > > user: leendert@eserver2.watson.ibm.com > date: Mon Jan 2 01:23:54 2006 -0400 > files: tools/debugger/libxendebug/xendebug.c tools/libxc/xc_hvm_build.c > description: > Finalize Xin Li's patch: vmx/svm_identify is no longer necessary. > Xen debug should test for HVM instead of VMX. > > Signed-off-by: Leendert van Doorn <leendert@watson.ibm.com> > > > user: twoller@xen-trw1.site > date: Sun Jan 1 03:22:39 2006 -0500 > files: tools/ioemu/vl.c > description: > change hardcoded VTXEN to HVMXEN. > > > user: leendert@eserver2.watson.ibm.com > date: Sun Jan 1 02:22:47 2006 -0400 > files: tools/libxc/xc_hvm_build.c tools/python/xen/xend/image.py xen/arch/x86/domain.c > description: > Avoid xen crash if there is no VMX support. If a platform > doesn't support VMX, creating VMX domain will crash xen > HV. > > Signed-off-by: Xin Li <xin.b.li@intel.com> > Signed-off-by: Leendert van Doorn <leendert@watson.ibm.com> > [ vmx/svm_identify are still needed in hvm builder, but this may not > really be necessary. I need to check this. - lvd ] > > > user: twoller@xen-trw1.site > date: Fri Dec 30 21:38:56 2005 -0500 > files: xen/arch/x86/svm.c xen/arch/x86/svm_vmcb.c xen/arch/x86/x86_32/entry.S xen/include/asm-x86/svm.h xen/include/asm-x86/svm_vmcb.h > description: > add multi-core support for guest ASIDs for SVM partitions. > > > user: leendert@eserver2.watson.ibm.com > date: Sun Dec 25 20:44:43 2005 -0400 > files: tools/firmware/vmxassist/head.S > description: > Make sure vmxassist still works in its debug environment. > > Signed-Off-By: Leendert van Doorn <leendert@watson.ibm.com> > > > user: leendert@eserver2.watson.ibm.com > date: Fri Dec 23 18:27:57 2005 -0400 > files: tools/libxc/xc_ia64_stubs.c > description: > Fixed libxc ia64, xend uses xc_hvm_build instead of xc_vmx_build. > > Signed-off-by: Leendert van Doorn <leendert@watson.ibm.com> > > > user: twoller@xen-trw1.site > date: Wed Dec 21 21:39:17 2005 -0500 > files: xen/arch/x86/svm_intr.c xen/arch/x86/svm_vmcb.c > description: > cleanup of svm specific code. > > > user: leendert@eserver2.watson.ibm.com > date: Wed Dec 21 17:18:25 2005 -0400 > files: tools/python/xen/xm/tests/test_create.py tools/xm-test/README > description: > Minor name cleanups. xm-test isn't VMX specific. Instead use HVM. > > > user: twoller@xen-trw1.site > date: Tue Dec 20 20:01:38 2005 -0500 > files: xen/arch/x86/svm_vmcb.c > description: > reword comments. > > > user: twoller@xen-trw1.site > date: Tue Dec 20 20:01:07 2005 -0500 > files: xen/arch/x86/svm_intr.c > description: > add additional VLAPIC delivery modes. > > > user: twoller@xen-trw1.site > date: Tue Dec 20 20:00:22 2005 -0500 > files: xen/arch/x86/svm.c > description: > reformat misaligned code. > > > user: twoller@xen-trw1.site > date: Tue Dec 20 19:59:37 2005 -0500 > files: xen/arch/x86/svm.c > description: > Add additional AMD SVM specific CPUID logic. > > > user: leendert@eserver2.watson.ibm.com > date: Thu Dec 15 03:06:15 2005 -0400 > files: tools/xm-test/tests/block-create/01_block_attach_device_pos.py tools/xm-test/tests/block-create/02_block_attach_file_device_pos.py tools/xm-test/tests/block-create/04_block_attach_device_repeatedly_pos.py tools/xm-test/tests/block-create/05_block_attach_and_dettach_device_repeatedly_pos.py tools/xm-test/tests/block-create/06_block_attach_baddomain_neg.py tools/xm-test/tests/block-create/07_block_attach_baddevice_neg.py tools/xm-test/tests/block-create/08_block_attach_bad_filedevice_neg.py tools/xm-test/tests/block-create/09_block_attach_and_dettach_device_check_data_pos.py tools/xm-test/tests/block-create/10_block_attach_dettach_multiple_devices.py tools/xm-test/tests/block-create/11_block_attach_shared_dom0.py tools/xm-test/tests/block-create/12_block_attach_shared_domU.py tools/xm-test/tests/block-destroy/01_block-destroy_btblock_pos.py tools/xm-test/tests/block-destroy/02_block-destroy_rtblock_pos.py tools/xm-test/tests/block-destroy/04_block-destroy_nonattached_neg.py tools/xm-test/tests/block-destroy/05_block-destroy_byname_pos.py tools/xm-test/tests/block-destroy/06_block-destroy_check_list_pos.py tools/xm-test/tests/block-list/01_block-list_pos.py tools/xm-test/tests/block-list/02_block-list_attachbd_pos.py tools/xm-test/tests/block-list/03_block-list_anotherbd_pos.py tools/xm-test/tests/block-list/04_block-list_nodb_pos.py tools/xm-test/tests/block-list/06_block-list_checkremove_pos.py tools/xm-test/tests/memmax/01_memmax_badparm_neg.py tools/xm-test/tests/memset/01_memset_basic_pos.py tools/xm-test/tests/memset/02_memset_badparm_neg.py tools/xm-test/tests/memset/03_memset_random_pos.py tools/xm-test/tests/memset/04_memset_smallmem_pos.py tools/xm-test/tests/migrate/01_migrate_localhost_pos.py tools/xm-test/tests/network-attach/01_network_attach_pos.py tools/xm-test/tests/network-attach/02_network_attach_detach_pos.py tools/xm-test/tests/network-attach/03_network_attach_detach_multiple_pos.py tools/xm-test/tests/restore/01_restore_basic_pos.py tools/xm-test/tests/restore/02_restore_badparm_neg.py tools/xm-test/tests/restore/03_restore_badfilename_neg.py tools/xm-test/tests/restore/04_restore_withdevices_pos.py tools/xm-test/tests/save/01_save_basic_pos.py tools/xm-test/tests/save/02_save_badparm_neg.py tools/xm-test/tests/save/03_save_bogusfile_neg.py tools/xm-test/tests/sysrq/01_sysrq_basic_neg.py tools/xm-test/tests/sysrq/02_sysrq_sync_pos.py tools/xm-test/tests/sysrq/03_sysrq_withreboot_pos.py > description: > Adding SKIP() to tests that aren't supported for VMX domains. > > Signed-off-by: Dan Stekloff <dsteklof@us.ibm.com> > Signed-off-by: Leendert van Doorn <leendert@watson.ibm.com> > > > user: leendert@eserver2.watson.ibm.com > date: Tue Dec 13 22:43:47 2005 -0400 > files: xen/arch/x86/svm.c xen/arch/x86/vmx.c xen/arch/x86/vmx_io.c xen/include/asm-x86/hvm_vpit.h xen/include/asm-x86/msr.h > description: > Support VMX guest accesses to IA32_TIME_STAMP_COUNTER MSR. > > Signed-off-by: Haifeng Xue <haifeng.xue@intel.com> > Signed-off-by: Leendert van Doorn <leendert@us.ibm.com> > > > user: twoller@xen-trw1.site > date: Tue Dec 13 19:49:53 2005 -0500 > files: xen/arch/x86/svm.c xen/arch/x86/svm_emulate.c xen/arch/x86/svm_instrlen.c xen/arch/x86/svm_intr.c xen/arch/x86/svm_vmcb.c xen/include/asm-x86/svm.h xen/include/asm-x86/svm_emulate.h xen/include/asm-x86/svm_intr.h xen/include/asm-x86/svm_vmcb.h xen/include/asm-x86/svm_vmmcall.h > description: > Add SVM base files to repository. > > > user: twoller@xen-trw1.site > date: Tue Dec 13 19:49:02 2005 -0500 > files: xen/arch/x86/x86_32/entry.S xen/arch/x86/x86_64/entry.S > description: > Add SVM entry points for launch/resume. > > > user: twoller@xen-trw1.site > date: Tue Dec 13 19:47:38 2005 -0500 > files: .hgignore > description: > Add hvmloader files to ignore list. > > > user: leendert@eserver2.watson.ibm.com > date: Mon Dec 12 22:58:54 2005 -0400 > files: docs/src/user.tex tools/firmware/README xen/include/asm-x86/hvm.h > description: > Removed dirty words (by request). > > > user: leendert@eserver2.watson.ibm.com > date: Mon Dec 12 05:48:22 2005 -0400 > files: tools/firmware/hvmloader/mkhex > description: > Fix file mode. > > Signed-off-by: Leendert van Doorn <leendert@watson.ibm.com> > > > user: leendert@eserver2.watson.ibm.com > date: Mon Dec 12 04:50:42 2005 -0400 > files: xen/Rules.mk xen/arch/x86/cpu/amd.c xen/arch/x86/cpu/intel.c xen/arch/x86/dm/hvm_vioapic.c xen/arch/x86/dm/i8259.c xen/arch/x86/dom0_ops.c xen/arch/x86/domain.c xen/arch/x86/hvm.c xen/arch/x86/hvm_intercept.c xen/arch/x86/hvm_io.c xen/arch/x86/hvm_platform.c xen/arch/x86/hvm_vlapic.c xen/arch/x86/mpparse.c xen/arch/x86/shadow.c xen/arch/x86/vmx.c xen/arch/x86/vmx_io.c xen/arch/x86/vmx_vmcs.c xen/arch/x86/x86_32/asm-offsets.c xen/arch/x86/x86_32/entry.S xen/arch/x86/x86_64/asm-offsets.c xen/arch/x86/x86_64/entry.S xen/arch/x86/x86_64/mm.c xen/include/asm-x86/config.h xen/include/asm-x86/cpufeature.h xen/include/asm-x86/domain.h xen/include/asm-x86/hvm_domain.h xen/include/asm-x86/hvm_io.h xen/include/asm-x86/hvm_support.h xen/include/asm-x86/hvm_vcpu.h xen/include/asm-x86/hvm_vioapic.h xen/include/asm-x86/hvm_vlapic.h xen/include/asm-x86/hvm_vpic.h xen/include/asm-x86/hvm_vpit.h xen/include/asm-x86/mpspec.h xen/include/asm-x86/msr.h xen/include/asm-x86/processor.h xen/include/asm-x86/vmx.h xen/include/asm-x86/vmx_cpu.h xen/include/asm-x86/vmx_vmcs.h > description: > Phase 3 of HVM integration: This patchset introduces the refactoring of > virtualization architecture independent functions from specific ones. > > > user: leendert@eserver2.watson.ibm.com > date: Sun Dec 11 07:02:51 2005 -0400 > files: xen/arch/x86/dom0_ops.c xen/arch/x86/domain.c xen/arch/x86/i387.c xen/arch/x86/shadow.c xen/arch/x86/vmx.c xen/arch/x86/x86_32/traps.c xen/arch/x86/x86_64/traps.c xen/include/asm-x86/hvm.h xen/include/asm-x86/hvm_support.h xen/include/asm-x86/regs.h xen/include/asm-x86/shadow.h xen/include/asm-x86/vmx_vmcs.h > description: > Phase 2 of HVM integration: This patchset introduces the hvm interface > to the hypervisor and modifies all the non-vmx specific files to use it. > > > user: leendert@eserver2.watson.ibm.com > date: Sun Dec 11 01:10:00 2005 -0400 > files: tools/examples/Makefile tools/examples/README tools/examples/xmexample.hvm tools/ioemu/exec-all.h tools/ioemu/hw/i8254.c tools/ioemu/hw/i8259.c tools/ioemu/monitor.c tools/ioemu/target-i386-dm/helper2.c tools/ioemu/vl.c tools/libxc/Makefile tools/libxc/xc_hvm_build.c tools/libxc/xc_ptrace.c tools/libxc/xc_ptrace_core.c tools/libxc/xenguest.h tools/python/xen/lowlevel/xc/xc.c tools/python/xen/xend/image.py tools/python/xen/xm/create.py tools/xm-test/configure.ac tools/xm-test/lib/XmTestLib/XenDomain.py tools/xm-test/lib/XmTestLib/config.py.in tools/xm-test/ramdisk/Makefile.am tools/xm-test/ramdisk/bin/create_disk_image tools/xm-test/tests/block-list/04_block-list_nodb_pos.py xen/include/public/arch-x86_32.h xen/include/public/arch-x86_64.h > description: > Phase 1 of HVM integration: This patchset updates the tools. Most of the > tools are machine independent except for some detection code in the hvm > domain builder.
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89 lines
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Domain firmware support
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-----------------------
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One of the key advantages of full virtualization hardware support (such
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as Intel's VT or AMD's SVM extensions) is the ability to run unmodified
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guest operating systems. However, since most OSes rely on BIOS support
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during their early bringup, we need to provide a surrogate ROMBIOS and
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VGABIOS firmware layer.
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What's more, we need to support real-mode which is required by
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the firmware and bootstrap loaders. Real-mode support is especially
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challenging for Intel's VMX (VT) enabled CPUs where there is no real-mode
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support for VMX guest partitions. In this case you either have to do full
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emulation (full real-mode emulator; more complete but potentially slower)
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or partial emulation (use the VM8086 extensions, emulate only those
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instructions that are missing; faster, but potentially incomplete). The
|
|
vmxassist code in this subdirectory uses the later approach because it
|
|
is smaller and faster.
|
|
|
|
The approach is relatively straight forward. Vmxloader contains three
|
|
payloads (rombios, vgabios and vmxassist) and it is bootstrapped as any
|
|
other 32-bit OS. Vmxloader copies its payloads to the addresses below
|
|
and transfers control to vmxassist.
|
|
|
|
vgabios VGABIOS (standard and Cirrus).
|
|
Resides at C000:0000.
|
|
|
|
vmxassist VMXAssist VM86 realmode emulator for VMX.
|
|
Resides at D000:0000.
|
|
|
|
rombios ROMBIOS code. Derived from Bochs.
|
|
Resides at F000:0000
|
|
|
|
Vmxassist first sets up it own world (GDT, IDT, TR, etc), enables
|
|
VM8086 and then transfers control to F000:FFF0 and executes 16-bit
|
|
code. Unsupported instructions cause a general protection failure at
|
|
which point vmxassist kicks in and emulates the offending instruction.
|
|
Whever the emulated code transitions to 32-bit protected mode, vmxassist
|
|
will go away. Whenever 32-bit protected code transitions to real-mode,
|
|
Xen/VMX will detect this and transfer control to vmxassist.
|
|
|
|
Most of the vmxassist complexity comes from properly handling the
|
|
real to protected mode and protected to real mode transitions and
|
|
the proper emulation of the segment registers. Even though the Intel
|
|
manual clearly states that you should immediately perform a jmp far
|
|
after a mode transition, many operating systems execute additional
|
|
instructions and some even refer to segment selectors and pop data
|
|
from the stack. Vmxassist contains a number of work arounds for these
|
|
OSes.
|
|
|
|
|
|
Acknowledgements
|
|
----------------
|
|
|
|
The rombios was taken (largely unmodified) from Bochs, which was written
|
|
by Kevin Lawton. The VGABIOS was written by Christophe Bothamy. Arun Sharma,
|
|
Asit Mallick and Nitin Kamble (Intel) provided the E820 patches and lots
|
|
of useful feedback.
|
|
|
|
|
|
Contact
|
|
-------
|
|
|
|
Leendert van Doorn
|
|
IBM T.J. Watson Research Center
|
|
19 Skyline Drive
|
|
Hawthorne, NY 10532
|
|
leendert@watson.ibm.com
|
|
|
|
|
|
Tested Operating Systems
|
|
------------------------
|
|
|
|
Since vmxassist uses partial emulation, it may always miss opcodes
|
|
that are required by a particular OS. The table below lists the OSes
|
|
I have tried. The Install column indicates a full CD/DVD install into
|
|
a VMX partition. The Disk column indicates booting from prefabricated
|
|
disk image.
|
|
|
|
Operating System Install Disk
|
|
------------------------------------------------------------
|
|
RedHat Enterprise Linux (RHEL3_U5) Yes Yes
|
|
Fedora Code (FC3) (-) Yes
|
|
FreeBSD 5.3 (-) Yes
|
|
MS-DOS 5.0 (-) Yes
|
|
|
|
(-) not tried yet
|
|
|