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xen: add PV/PVH kernel entry point

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Add the PV/PVH entry point and the low level functions for PVH
early initialization.

Approved by: gibbs
Sponsored by: Citrix Systems R&D

amd64/amd64/genassym.c:
 - Add __FreeBSD_version define to assym.s so it can be used for the
   Xen notes.

amd64/amd64/locore.S:
 - Make bootstack global so it can be used from Xen kernel entry
   point.

amd64/amd64/xen-locore.S:
 - Add Xen notes to the kernel.
 - Add the Xen PV entry point, that is going to call hammer_time_xen.

amd64/include/asmacros.h:
 - Add ELFNOTE macros.

i386/xen/xen_machdep.c:
 - Define HYPERVISOR_start_info for the XEN i386 PV port, which is
   going to be used in some shared code between PV and PVH.

x86/xen/hvm.c:
 - Define HYPERVISOR_start_info for the PVH port.

x86/xen/pv.c:
 - Introduce hammer_time_xen which is going to perform early setup for
   Xen PVH:
    - Setup shared Xen variables start_info, shared_info and
      xen_store.
    - Set guest type.
    - Create initial page tables as FreeBSD expects to find them.
    - Call into native init function (hammer_time).

xen/xen-os.h:
 - Declare HYPERVISOR_start_info.

conf/files.amd64:
 - Add amd64/amd64/locore.S and x86/xen/pv.c to the list of files.
This commit is contained in:
Roger Pau Monné 2014-03-11 10:07:01 +00:00
parent e8da1c4877
commit 1a9cdd373a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=263002
9 changed files with 240 additions and 0 deletions
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2
sys/amd64/amd64/genassym.c
View File

@ -248,6 +248,8 @@ ASSYM(TSSSEL, GSEL(GPROC0_SEL, SEL_KPL));
ASSYM(LDTSEL, GSEL(GUSERLDT_SEL, SEL_KPL));
ASSYM(SEL_RPL_MASK, SEL_RPL_MASK);
ASSYM(__FreeBSD_version, __FreeBSD_version);
#ifdef HWPMC_HOOKS
ASSYM(PMC_FN_USER_CALLCHAIN, PMC_FN_USER_CALLCHAIN);
#endif

1
sys/amd64/amd64/locore.S
View File

@ -84,5 +84,6 @@ NON_GPROF_ENTRY(btext)
.bss
ALIGN_DATA /* just to be sure */
.globl bootstack
.space 0x1000 /* space for bootstack - temporary stack */
bootstack:

83
sys/amd64/amd64/xen-locore.S Normal file
View File

@ -0,0 +1,83 @@
/*-
* Copyright (c) 2003 Peter Wemm <peter@FreeBSD.org>
* Copyright (c) 2013 Roger Pau Monne <royger@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <machine/asmacros.h>
#include <machine/psl.h>
#include <machine/pmap.h>
#include <machine/specialreg.h>
#include <xen/xen-os.h>
#define __ASSEMBLY__
#include <xen/interface/elfnote.h>
#include "assym.s"
.section __xen_guest
ELFNOTE(Xen, XEN_ELFNOTE_GUEST_OS, .asciz, "FreeBSD")
ELFNOTE(Xen, XEN_ELFNOTE_GUEST_VERSION, .asciz, __XSTRING(__FreeBSD_version))
ELFNOTE(Xen, XEN_ELFNOTE_XEN_VERSION, .asciz, "xen-3.0")
ELFNOTE(Xen, XEN_ELFNOTE_VIRT_BASE, .quad, KERNBASE)
ELFNOTE(Xen, XEN_ELFNOTE_PADDR_OFFSET, .quad, KERNBASE) /* Xen honours elf->p_paddr; compensate for this */
ELFNOTE(Xen, XEN_ELFNOTE_ENTRY, .quad, xen_start)
ELFNOTE(Xen, XEN_ELFNOTE_HYPERCALL_PAGE, .quad, hypercall_page)
ELFNOTE(Xen, XEN_ELFNOTE_HV_START_LOW, .quad, HYPERVISOR_VIRT_START)
ELFNOTE(Xen, XEN_ELFNOTE_FEATURES, .asciz, "writable_descriptor_tables|auto_translated_physmap|supervisor_mode_kernel|hvm_callback_vector")
ELFNOTE(Xen, XEN_ELFNOTE_PAE_MODE, .asciz, "yes")
ELFNOTE(Xen, XEN_ELFNOTE_L1_MFN_VALID, .long, PG_V, PG_V)
ELFNOTE(Xen, XEN_ELFNOTE_LOADER, .asciz, "generic")
ELFNOTE(Xen, XEN_ELFNOTE_SUSPEND_CANCEL, .long, 0)
ELFNOTE(Xen, XEN_ELFNOTE_BSD_SYMTAB, .asciz, "yes")
.text
.p2align PAGE_SHIFT, 0x90 /* Hypercall_page needs to be PAGE aligned */
NON_GPROF_ENTRY(hypercall_page)
.skip 0x1000, 0x90 /* Fill with "nop"s */
NON_GPROF_ENTRY(xen_start)
/* Don't trust what the loader gives for rflags. */
pushq $PSL_KERNEL
popfq
/* Parameters for the xen init function */
movq %rsi, %rdi /* shared_info (arg 1) */
movq %rsp, %rsi /* xenstack (arg 2) */
/* Use our own stack */
movq $bootstack,%rsp
xorl %ebp, %ebp
/* u_int64_t hammer_time_xen(start_info_t *si, u_int64_t xenstack); */
call hammer_time_xen
movq %rax, %rsp /* set up kstack for mi_startup() */
call mi_startup /* autoconfiguration, mountroot etc */
/* NOTREACHED */
0: hlt
jmp 0b

26
sys/amd64/include/asmacros.h
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@ -201,4 +201,30 @@
#endif /* LOCORE */
#ifdef __STDC__
#define ELFNOTE(name, type, desctype, descdata...) \
.pushsection .note.name ; \
.align 4 ; \
.long 2f - 1f /* namesz */ ; \
.long 4f - 3f /* descsz */ ; \
.long type ; \
1:.asciz #name ; \
2:.align 4 ; \
3:desctype descdata ; \
4:.align 4 ; \
.popsection
#else /* !__STDC__, i.e. -traditional */
#define ELFNOTE(name, type, desctype, descdata) \
.pushsection .note.name ; \
.align 4 ; \
.long 2f - 1f /* namesz */ ; \
.long 4f - 3f /* descsz */ ; \
.long type ; \
1:.asciz "name" ; \
2:.align 4 ; \
3:desctype descdata ; \
4:.align 4 ; \
.popsection
#endif /* __STDC__ */
#endif /* !_MACHINE_ASMACROS_H_ */

2
sys/conf/files.amd64
View File

@ -108,6 +108,7 @@ amd64/amd64/in_cksum.c optional inet | inet6
amd64/amd64/initcpu.c standard
amd64/amd64/io.c optional io
amd64/amd64/locore.S standard no-obj
amd64/amd64/xen-locore.S optional xenhvm
amd64/amd64/machdep.c standard
amd64/amd64/mem.c optional mem
amd64/amd64/minidump_machdep.c standard
@ -555,3 +556,4 @@ x86/x86/nexus.c standard
x86/x86/tsc.c standard
x86/xen/hvm.c optional xenhvm
x86/xen/xen_intr.c optional xen | xenhvm
x86/xen/pv.c optional xenhvm

2
sys/i386/xen/xen_machdep.c
View File

@ -89,6 +89,7 @@ IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl),
int xendebug_flags;
start_info_t *xen_start_info;
start_info_t *HYPERVISOR_start_info;
shared_info_t *HYPERVISOR_shared_info;
xen_pfn_t *xen_machine_phys = machine_to_phys_mapping;
xen_pfn_t *xen_phys_machine;
@ -927,6 +928,7 @@ initvalues(start_info_t *startinfo)
HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_4gb_segments_notify);
#endif
xen_start_info = startinfo;
HYPERVISOR_start_info = startinfo;
xen_phys_machine = (xen_pfn_t *)startinfo->mfn_list;
IdlePTD = (pd_entry_t *)((uint8_t *)startinfo->pt_base + PAGE_SIZE);

1
sys/x86/xen/hvm.c
View File

@ -149,6 +149,7 @@ DPCPU_DEFINE(xen_intr_handle_t, ipi_handle[nitems(xen_ipis)]);
/** Hypercall table accessed via HYPERVISOR_*_op() methods. */
char *hypercall_stubs;
shared_info_t *HYPERVISOR_shared_info;
start_info_t *HYPERVISOR_start_info;
#ifdef SMP
/*---------------------------- XEN PV IPI Handlers ---------------------------*/

119
sys/x86/xen/pv.c Normal file
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@ -0,0 +1,119 @@
/*
* Copyright (c) 2004 Christian Limpach.
* Copyright (c) 2004-2006,2008 Kip Macy
* Copyright (c) 2013 Roger Pau Monné <roger.pau@citrix.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/reboot.h>
#include <sys/systm.h>
#include <sys/lock.h>
#include <sys/rwlock.h>
#include <vm/vm.h>
#include <vm/vm_extern.h>
#include <vm/vm_kern.h>
#include <vm/vm_page.h>
#include <vm/vm_map.h>
#include <vm/vm_object.h>
#include <vm/vm_pager.h>
#include <vm/vm_param.h>
#include <xen/xen-os.h>
#include <xen/hypervisor.h>
/* Native initial function */
extern u_int64_t hammer_time(u_int64_t, u_int64_t);
/* Xen initial function */
uint64_t hammer_time_xen(start_info_t *, uint64_t);
/*
* First function called by the Xen PVH boot sequence.
*
* Set some Xen global variables and prepare the environment so it is
* as similar as possible to what native FreeBSD init function expects.
*/
uint64_t
hammer_time_xen(start_info_t *si, uint64_t xenstack)
{
uint64_t physfree;
uint64_t *PT4 = (u_int64_t *)xenstack;
uint64_t *PT3 = (u_int64_t *)(xenstack + PAGE_SIZE);
uint64_t *PT2 = (u_int64_t *)(xenstack + 2 * PAGE_SIZE);
int i;
xen_domain_type = XEN_PV_DOMAIN;
vm_guest = VM_GUEST_XEN;
if ((si == NULL) || (xenstack == 0)) {
HYPERVISOR_shutdown(SHUTDOWN_crash);
}
/* We use 3 pages of xen stack for the boot pagetables */
physfree = xenstack + 3 * PAGE_SIZE - KERNBASE;
/* Setup Xen global variables */
HYPERVISOR_start_info = si;
HYPERVISOR_shared_info =
(shared_info_t *)(si->shared_info + KERNBASE);
/*
* Setup some misc global variables for Xen devices
*
* XXX: Devices that need these specific variables should
* be rewritten to fetch this info by themselves from the
* start_info page.
*/
xen_store = (struct xenstore_domain_interface *)
(ptoa(si->store_mfn) + KERNBASE);
/*
* Use the stack Xen gives us to build the page tables
* as native FreeBSD expects to find them (created
* by the boot trampoline).
*/
for (i = 0; i < (PAGE_SIZE / sizeof(uint64_t)); i++) {
/* Each slot of the level 4 pages points to the same level 3 page */
PT4[i] = ((uint64_t)&PT3[0]) - KERNBASE;
PT4[i] |= PG_V | PG_RW | PG_U;
/* Each slot of the level 3 pages points to the same level 2 page */
PT3[i] = ((uint64_t)&PT2[0]) - KERNBASE;
PT3[i] |= PG_V | PG_RW | PG_U;
/* The level 2 page slots are mapped with 2MB pages for 1GB. */
PT2[i] = i * (2 * 1024 * 1024);
PT2[i] |= PG_V | PG_RW | PG_PS | PG_U;
}
load_cr3(((uint64_t)&PT4[0]) - KERNBASE);
/* Now we can jump into the native init function */
return (hammer_time(0, physfree));
}

4
sys/xen/xen-os.h
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@ -51,6 +51,10 @@
void force_evtchn_callback(void);
extern shared_info_t *HYPERVISOR_shared_info;
extern start_info_t *HYPERVISOR_start_info;
/* XXX: we need to get rid of this and use HYPERVISOR_start_info directly */
extern struct xenstore_domain_interface *xen_store;
enum xen_domain_type {
XEN_NATIVE, /* running on bare hardware */