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List: xen-devel
Subject: Re: [Xen-devel] [Patch 4/5] X86/vMCE: handle broken page occurred before migration
From: "Liu, Jinsong" <jinsong.liu () intel ! com>
Date: 2012-10-31 10:58:24
Message-ID: DE8DF0795D48FD4CA783C40EC82923353765BF () SHSMSX101 ! ccr ! corp ! intel ! com
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George Dunlap wrote:
> Jinsong,
>
> I'm at UDS now, but I'll try to review the new patches in the next
> few days.
>
> If you end up sending these patches again, could you please send them
> in
> a more normal "patchbomb-style" format? I.e., with a "00/02" header
> describing what's new in the series, and then naming them 01/02 and
> 02/02 (instead of 4 and 5, when 1-3 have been applied for months)?
>
> The easiest way to do this is to use hg's patchbomb extension;
> there's a description of how to set it up here:
>
> http://wiki.xen.org/wiki/SubmittingXenPatches
>
> It's a few minutes to set up, but it's well worth it both for us and
> for you.
>
> Thanks,
> -George
Thanks, just updated per Jan's comments, and will re-send them in patchbomb style.
Jinsong
>
> On Mon, Oct 29, 2012 at 4:21 PM, Liu, Jinsong <jinsong.liu@intel.com>
> wrote:
>> X86/vMCE: handle broken page occurred before migration
>>
>> This patch handles guest broken page which occur before migration.
>>
>> At sender, the broken page would be mapped but not copied to target
>> (otherwise it may trigger more serious error, say, SRAR error).
>> While its pfn_type and pfn number would be transferred to target
>> so that target take appropriate action.
>>
>> At target, it would set p2m as p2m_ram_broken for broken page, so
>> that
>> if guest access the broken page again, it would kill itself as
>> expected.
>>
>> Signed-off-by: Liu, Jinsong <jinsong.liu@intel.com>
>>
>> diff -r e27a6d53ac15 tools/libxc/xc_domain.c
>> --- a/tools/libxc/xc_domain.c Thu Oct 11 01:52:33 2012 +0800
>> +++ b/tools/libxc/xc_domain.c Thu Oct 25 05:49:10 2012 +0800 @@
>> -283,6 +283,22 @@ return ret;
>> }
>>
>> +/* set broken page p2m */
>> +int xc_set_broken_page_p2m(xc_interface *xch,
>> + uint32_t domid,
>> + unsigned long pfn)
>> +{
>> + int ret;
>> + DECLARE_DOMCTL;
>> +
>> + domctl.cmd = XEN_DOMCTL_set_broken_page_p2m;
>> + domctl.domain = (domid_t)domid;
>> + domctl.u.set_broken_page_p2m.pfn = pfn;
>> + ret = do_domctl(xch, &domctl);
>> +
>> + return ret ? -1 : 0;
>> +}
>> +
>> /* get info from hvm guest for save */
>> int xc_domain_hvm_getcontext(xc_interface *xch,
>> uint32_t domid,
>> diff -r e27a6d53ac15 tools/libxc/xc_domain_restore.c
>> --- a/tools/libxc/xc_domain_restore.c Thu Oct 11 01:52:33 2012
>> +0800 +++ b/tools/libxc/xc_domain_restore.c Thu Oct 25 05:49:10
>> 2012 +0800 @@ -962,9 +962,15 @@
>>
>> countpages = count;
>> for (i = oldcount; i < buf->nr_pages; ++i)
>> - if ((buf->pfn_types[i] & XEN_DOMCTL_PFINFO_LTAB_MASK) ==
>> XEN_DOMCTL_PFINFO_XTAB
>> - ||(buf->pfn_types[i] & XEN_DOMCTL_PFINFO_LTAB_MASK) ==
>> XEN_DOMCTL_PFINFO_XALLOC) + { + unsigned long pagetype;
>> +
>> + pagetype = buf->pfn_types[i] & XEN_DOMCTL_PFINFO_LTAB_MASK;
>> + if ( pagetype == XEN_DOMCTL_PFINFO_XTAB ||
>> + pagetype == XEN_DOMCTL_PFINFO_BROKEN ||
>> + pagetype == XEN_DOMCTL_PFINFO_XALLOC )
>> --countpages; + }
>>
>> if (!countpages)
>> return count;
>> @@ -1200,6 +1206,17 @@
>> /* a bogus/unmapped/allocate-only page: skip it */
>> continue;
>>
>> + if ( pagetype == XEN_DOMCTL_PFINFO_BROKEN ) + {
>> + if ( xc_set_broken_page_p2m(xch, dom, pfn) ) +
>> { + ERROR("Set p2m for broken page failed, "
>> + "dom=%d, pfn=%lx\n", dom, pfn);
>> + goto err_mapped;
>> + }
>> + continue;
>> + }
>> +
>> if (pfn_err[i])
>> {
>> ERROR("unexpected PFN mapping failure pfn %lx map_mfn
>> %lx p2m_mfn %lx",
>> diff -r e27a6d53ac15 tools/libxc/xc_domain_save.c
>> --- a/tools/libxc/xc_domain_save.c Thu Oct 11 01:52:33 2012
>> +0800 +++ b/tools/libxc/xc_domain_save.c Thu Oct 25 05:49:10
>> 2012 +0800 @@ -1277,6 +1277,13 @@ if ( !hvm )
>> gmfn = pfn_to_mfn(gmfn);
>>
>> + if ( pfn_type[j] == XEN_DOMCTL_PFINFO_BROKEN ) +
>> { + pfn_type[j] |= pfn_batch[j];
>> + ++run;
>> + continue;
>> + }
>> +
>> if ( pfn_err[j] )
>> {
>> if ( pfn_type[j] == XEN_DOMCTL_PFINFO_XTAB ) @@
>> -1371,8 +1378,12 @@ }
>> }
>>
>> - /* skip pages that aren't present or are alloc-only
>> */ + /* + * skip pages that aren't
>> present, + * or are broken, or are alloc-only +
>> */ if ( pagetype == XEN_DOMCTL_PFINFO_XTAB
>> + || pagetype == XEN_DOMCTL_PFINFO_BROKEN
>> || pagetype == XEN_DOMCTL_PFINFO_XALLOC )
>> continue;
>>
>> diff -r e27a6d53ac15 tools/libxc/xenctrl.h
>> --- a/tools/libxc/xenctrl.h Thu Oct 11 01:52:33 2012 +0800
>> +++ b/tools/libxc/xenctrl.h Thu Oct 25 05:49:10 2012 +0800 @@
>> -575,6 +575,17 @@ xc_domaininfo_t *info);
>>
>> /**
>> + * This function set p2m for broken page
>> + * &parm xch a handle to an open hypervisor interface
>> + * @parm domid the domain id which broken page belong to
>> + * @parm pfn the pfn number of the broken page
>> + * @return 0 on success, -1 on failure
>> + */
>> +int xc_set_broken_page_p2m(xc_interface *xch,
>> + uint32_t domid,
>> + unsigned long pfn);
>> +
>> +/**
>> * This function returns information about the context of a hvm
>> domain
>> * @parm xch a handle to an open hypervisor interface
>> * @parm domid the domain to get information from
>> diff -r e27a6d53ac15 xen/arch/x86/domctl.c
>> --- a/xen/arch/x86/domctl.c Thu Oct 11 01:52:33 2012 +0800
>> +++ b/xen/arch/x86/domctl.c Thu Oct 25 05:49:10 2012 +0800 @@
>> -209,12 +209,18 @@ for ( j = 0; j < k; j++ )
>> {
>> unsigned long type = 0;
>> + p2m_type_t t;
>>
>> - page = get_page_from_gfn(d, arr[j], NULL,
>> P2M_ALLOC); + page = get_page_from_gfn(d, arr[j],
>> &t, P2M_ALLOC);
>>
>> if ( unlikely(!page) ||
>> unlikely(is_xen_heap_page(page)) )
>> - type = XEN_DOMCTL_PFINFO_XTAB; +
>> { + if ( p2m_is_broken(t) )
>> + type = XEN_DOMCTL_PFINFO_BROKEN; +
>> else + type = XEN_DOMCTL_PFINFO_XTAB; +
>> } else
>> {
>> switch( page->u.inuse.type_info &
>> PGT_type_mask ) @@ -235,6 +241,9 @@
>>
>> if ( page->u.inuse.type_info & PGT_pinned )
>> type |= XEN_DOMCTL_PFINFO_LPINTAB; +
>> + if ( page->count_info & PGC_broken )
>> + type = XEN_DOMCTL_PFINFO_BROKEN;
>> }
>>
>> if ( page )
>> @@ -1568,6 +1577,28 @@
>> }
>> break;
>>
>> + case XEN_DOMCTL_set_broken_page_p2m:
>> + {
>> + struct domain *d;
>> + p2m_type_t pt;
>> + unsigned long pfn;
>> +
>> + d = rcu_lock_domain_by_id(domctl->domain); + if ( d
>> != NULL ) + {
>> + pfn = domctl->u.set_broken_page_p2m.pfn; +
>> + get_gfn_query(d, pfn, &pt);
>> + p2m_change_type(d, pfn, pt, p2m_ram_broken); +
>> put_gfn(d, pfn); +
>> + rcu_unlock_domain(d);
>> + }
>> + else
>> + ret = -ESRCH;
>> + }
>> + break;
>> +
>> default:
>> ret = iommu_do_domctl(domctl, u_domctl);
>> break;
>> diff -r e27a6d53ac15 xen/include/public/domctl.h
>> --- a/xen/include/public/domctl.h Thu Oct 11 01:52:33 2012
>> +0800 +++ b/xen/include/public/domctl.h Thu Oct 25 05:49:10
>> 2012 +0800 @@ -136,6 +136,7 @@ #define XEN_DOMCTL_PFINFO_LPINTAB
>> (0x1U<<31) #define XEN_DOMCTL_PFINFO_XTAB (0xfU<<28) /* invalid
>> page */ #define XEN_DOMCTL_PFINFO_XALLOC (0xeU<<28) /*
>> allocate-only page */ +#define XEN_DOMCTL_PFINFO_BROKEN (0xdU<<28)
>> /* broken page */ #define XEN_DOMCTL_PFINFO_PAGEDTAB (0x8U<<28)
>> #define XEN_DOMCTL_PFINFO_LTAB_MASK (0xfU<<28)
>>
>> @@ -835,6 +836,12 @@
>> typedef struct xen_domctl_set_access_required
>> xen_domctl_set_access_required_t;
>> DEFINE_XEN_GUEST_HANDLE(xen_domctl_set_access_required_t);
>>
>> +struct xen_domctl_set_broken_page_p2m {
>> + uint64_aligned_t pfn;
>> +};
>> +typedef struct xen_domctl_set_broken_page_p2m
>> xen_domctl_set_broken_page_p2m_t;
>> +DEFINE_XEN_GUEST_HANDLE(xen_domctl_set_broken_page_p2m_t); +
>> struct xen_domctl { uint32_t cmd;
>> #define XEN_DOMCTL_createdomain 1 @@ -900,6
>> +907,7 @@ #define XEN_DOMCTL_set_access_required 64
>> #define XEN_DOMCTL_audit_p2m 65
>> #define XEN_DOMCTL_set_virq_handler 66
>> +#define XEN_DOMCTL_set_broken_page_p2m 67
>> #define XEN_DOMCTL_gdbsx_guestmemio 1000
>> #define XEN_DOMCTL_gdbsx_pausevcpu 1001
>> #define XEN_DOMCTL_gdbsx_unpausevcpu 1002 @@ -955,6
>> +963,7 @@ struct xen_domctl_audit_p2m audit_p2m;
>> struct xen_domctl_set_virq_handler set_virq_handler;
>> struct xen_domctl_gdbsx_memio gdbsx_guest_memio;
>> + struct xen_domctl_set_broken_page_p2m set_broken_page_p2m;
>> struct xen_domctl_gdbsx_pauseunp_vcpu gdbsx_pauseunp_vcpu;
>> struct xen_domctl_gdbsx_domstatus gdbsx_domstatus;
>> uint8_t pad[128];
>> _______________________________________________
>> Xen-devel mailing list
>> Xen-devel@lists.xen.org
>> http://lists.xen.org/xen-devel
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