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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [RFC Patch 25/25] sync mmu before resuming secondary vm
At 07/24/2014 06:59 PM, Tim Deegan Write:
> At 19:39 +0800 on 18 Jul (1405708750), Wen Congyang wrote:
>> In out test, we find secondary vm will be bluescreen due to memory
>> related problem. If we sync mmu, the problem will disappear.
>
> Erk. Do you understand _why_ this happens? Do you need both the TLB
> flush and the EPT flush to fix it?
>
> The TLB flush sounds plausible because the migration may have changed
> some pagetables and you've elided any TLB flushes that happened on the
> source. For that case I think I'd prefer to make the TLB flush
> implicit in the HVM load operation, e.g., by putting a call to
> hvm_asid_flush_vcpu(v) into hvm_load_cpu_ctxt() (on the grounds that the
> TLB is part of the vcpu state).
Hmm, I don't investigate this problem deeply. I will try you suggestion.
Thanks
Wen Congyang
>
> Cheers,
>
> Tim.
>
>> TODO: only vmx+ept is done.
>> Signed-off-by: Wen Congyang <wency@xxxxxxxxxxxxxx>
>> ---
>> tools/libxc/xc_domain.c | 9 +++++++++
>> tools/libxc/xenctrl.h | 2 ++
>> tools/libxl/libxl_colo_restore.c | 6 +++++-
>> xen/arch/x86/domctl.c | 15 +++++++++++++++
>> xen/arch/x86/hvm/save.c | 6 ++++++
>> xen/arch/x86/hvm/vmx/vmcs.c | 8 ++++++++
>> xen/arch/x86/hvm/vmx/vmx.c | 1 +
>> xen/include/asm-x86/hvm/hvm.h | 1 +
>> xen/include/asm-x86/hvm/vmx/vmcs.h | 1 +
>> xen/include/public/domctl.h | 1 +
>> xen/include/xen/hvm/save.h | 2 ++
>> 11 files changed, 51 insertions(+), 1 deletion(-)
>>
>> diff --git a/tools/libxc/xc_domain.c b/tools/libxc/xc_domain.c
>> index 0230c6c..0b47bdd 100644
>> --- a/tools/libxc/xc_domain.c
>> +++ b/tools/libxc/xc_domain.c
>> @@ -2123,6 +2123,15 @@ int xc_domain_set_max_evtchn(xc_interface *xch,
>> uint32_t domid,
>> return do_domctl(xch, &domctl);
>> }
>>
>> +int xc_domain_hvm_sync_mmu(xc_interface *xch, uint32_t domid)
>> +{
>> + DECLARE_DOMCTL;
>> +
>> + domctl.cmd = XEN_DOMCTL_hvm_sync_mmu;
>> + domctl.domain = domid;
>> + return do_domctl(xch, &domctl);
>> +}
>> +
>> /*
>> * Local variables:
>> * mode: C
>> diff --git a/tools/libxc/xenctrl.h b/tools/libxc/xenctrl.h
>> index 3578b09..a83364a 100644
>> --- a/tools/libxc/xenctrl.h
>> +++ b/tools/libxc/xenctrl.h
>> @@ -961,6 +961,8 @@ int xc_domain_set_virq_handler(xc_interface *xch,
>> uint32_t domid, int virq);
>> int xc_domain_set_max_evtchn(xc_interface *xch, uint32_t domid,
>> uint32_t max_port);
>>
>> +int xc_domain_hvm_sync_mmu(xc_interface *xch, uint32_t domid);
>> +
>> /*
>> * CPUPOOL MANAGEMENT FUNCTIONS
>> */
>> diff --git a/tools/libxl/libxl_colo_restore.c
>> b/tools/libxl/libxl_colo_restore.c
>> index aea3feb..730b492 100644
>> --- a/tools/libxl/libxl_colo_restore.c
>> +++ b/tools/libxl/libxl_colo_restore.c
>> @@ -124,11 +124,15 @@ static void colo_resume_vm(libxl__egc *egc,
>> STATE_AO_GC(crs->ao);
>>
>> if (!crs->saved_cb) {
>> - /* TODO: sync mmu for hvm? */
>> + rc = xc_domain_hvm_sync_mmu(CTX->xch, crs->domid);
>> + if (rc)
>> + goto fail;
>> +
>> rc = libxl__domain_resume(gc, crs->domid, 0, 1);
>> if (rc)
>> LOG(ERROR, "cannot resume secondary vm");
>>
>> +fail:
>> crcs->callback(egc, crcs, rc);
>> return;
>> }
>> diff --git a/xen/arch/x86/domctl.c b/xen/arch/x86/domctl.c
>> index d62c715..d0dfad7 100644
>> --- a/xen/arch/x86/domctl.c
>> +++ b/xen/arch/x86/domctl.c
>> @@ -1395,6 +1395,21 @@ long arch_do_domctl(
>> }
>> break;
>>
>> + case XEN_DOMCTL_hvm_sync_mmu:
>> + {
>> + struct domain *d;
>> +
>> + ret = -ESRCH;
>> + d = rcu_lock_domain_by_id(domctl->domain);
>> + if ( d != NULL )
>> + {
>> + arch_hvm_sync_mmu(d);
>> + rcu_unlock_domain(d);
>> + ret = 0;
>> + }
>> + }
>> + break;
>> +
>> default:
>> ret = iommu_do_domctl(domctl, d, u_domctl);
>> break;
>> diff --git a/xen/arch/x86/hvm/save.c b/xen/arch/x86/hvm/save.c
>> index 6af19be..7a07ebf 100644
>> --- a/xen/arch/x86/hvm/save.c
>> +++ b/xen/arch/x86/hvm/save.c
>> @@ -79,6 +79,12 @@ int arch_hvm_load(struct domain *d, struct
>> hvm_save_header *hdr)
>> return 0;
>> }
>>
>> +void arch_hvm_sync_mmu(struct domain *d)
>> +{
>> + if (hvm_funcs.sync_mmu)
>> + hvm_funcs.sync_mmu(d);
>> +}
>> +
>> /*
>> * Local variables:
>> * mode: C
>> diff --git a/xen/arch/x86/hvm/vmx/vmcs.c b/xen/arch/x86/hvm/vmx/vmcs.c
>> index 8ffc562..4be9b4d 100644
>> --- a/xen/arch/x86/hvm/vmx/vmcs.c
>> +++ b/xen/arch/x86/hvm/vmx/vmcs.c
>> @@ -596,6 +596,14 @@ void vmx_cpu_down(void)
>> local_irq_restore(flags);
>> }
>>
>> +void vmx_sync_mmu(struct domain *d)
>> +{
>> + ept_sync_domain(p2m_get_hostp2m(d));
>> +
>> + /* flush tlb */
>> + flush_all(FLUSH_TLB_GLOBAL);
>> +}
>> +
>> struct foreign_vmcs {
>> struct vcpu *v;
>> unsigned int count;
>> diff --git a/xen/arch/x86/hvm/vmx/vmx.c b/xen/arch/x86/hvm/vmx/vmx.c
>> index eb73412..b46b4dd 100644
>> --- a/xen/arch/x86/hvm/vmx/vmx.c
>> +++ b/xen/arch/x86/hvm/vmx/vmx.c
>> @@ -1719,6 +1719,7 @@ static struct hvm_function_table __initdata
>> vmx_function_table = {
>> .event_pending = vmx_event_pending,
>> .cpu_up = vmx_cpu_up,
>> .cpu_down = vmx_cpu_down,
>> + .sync_mmu = vmx_sync_mmu,
>> .cpuid_intercept = vmx_cpuid_intercept,
>> .wbinvd_intercept = vmx_wbinvd_intercept,
>> .fpu_dirty_intercept = vmx_fpu_dirty_intercept,
>> diff --git a/xen/include/asm-x86/hvm/hvm.h b/xen/include/asm-x86/hvm/hvm.h
>> index 0ebd478..b4f89a7 100644
>> --- a/xen/include/asm-x86/hvm/hvm.h
>> +++ b/xen/include/asm-x86/hvm/hvm.h
>> @@ -151,6 +151,7 @@ struct hvm_function_table {
>>
>> int (*cpu_up)(void);
>> void (*cpu_down)(void);
>> + void (*sync_mmu)(struct domain *d);
>>
>> /* Copy up to 15 bytes from cached instruction bytes at current rIP. */
>> unsigned int (*get_insn_bytes)(struct vcpu *v, uint8_t *buf);
>> diff --git a/xen/include/asm-x86/hvm/vmx/vmcs.h
>> b/xen/include/asm-x86/hvm/vmx/vmcs.h
>> index 215d93c..664741a 100644
>> --- a/xen/include/asm-x86/hvm/vmx/vmcs.h
>> +++ b/xen/include/asm-x86/hvm/vmx/vmcs.h
>> @@ -29,6 +29,7 @@ extern int vmx_cpu_up_prepare(unsigned int cpu);
>> extern void vmx_cpu_dead(unsigned int cpu);
>> extern int vmx_cpu_up(void);
>> extern void vmx_cpu_down(void);
>> +extern void vmx_sync_mmu(struct domain *d);
>> extern void vmx_save_host_msrs(void);
>>
>> struct vmcs_struct {
>> diff --git a/xen/include/public/domctl.h b/xen/include/public/domctl.h
>> index 5b11bbf..11e5a26 100644
>> --- a/xen/include/public/domctl.h
>> +++ b/xen/include/public/domctl.h
>> @@ -1008,6 +1008,7 @@ struct xen_domctl {
>> #define XEN_DOMCTL_cacheflush 71
>> #define XEN_DOMCTL_get_vcpu_msrs 72
>> #define XEN_DOMCTL_set_vcpu_msrs 73
>> +#define XEN_DOMCTL_hvm_sync_mmu 74
>> #define XEN_DOMCTL_gdbsx_guestmemio 1000
>> #define XEN_DOMCTL_gdbsx_pausevcpu 1001
>> #define XEN_DOMCTL_gdbsx_unpausevcpu 1002
>> diff --git a/xen/include/xen/hvm/save.h b/xen/include/xen/hvm/save.h
>> index ae6f0bb..049fdb8 100644
>> --- a/xen/include/xen/hvm/save.h
>> +++ b/xen/include/xen/hvm/save.h
>> @@ -135,4 +135,6 @@ struct hvm_save_header;
>> void arch_hvm_save(struct domain *d, struct hvm_save_header *hdr);
>> int arch_hvm_load(struct domain *d, struct hvm_save_header *hdr);
>>
>> +void arch_hvm_sync_mmu(struct domain *d);
>> +
>> #endif /* __XEN_HVM_SAVE_H__ */
>> --
>> 1.9.3
>>
>>
>> _______________________________________________
>> Xen-devel mailing list
>> Xen-devel@xxxxxxxxxxxxx
>> http://lists.xen.org/xen-devel
> .
>
--
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--------------------------------------------------
Wen Congyang
Development Dept.I
Nanjing Fujitsu Nanda Software Tech. Co., Ltd.(FNST)
No. 6 Wenzhu Road, Nanjing, 210012, China
Postcode: 210012
TELÂÂ+86+25-86630566-8503
FUJITSU INTERNALÂÂ79955-8503
FAXÂÂ+86+25-83317685
MailÂÂwency@xxxxxxxxxxxxxx
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