From: Qing He <qing.he@intel.com>
To: Tim Deegan <Tim.Deegan@citrix.com>
Cc: "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>
Subject: Re: [PATCH 03/17] vmx: nest: wrapper for control update
Date: Thu, 20 May 2010 17:46:38 +0800 [thread overview]
Message-ID: <20100520094638.GB21042@qhe2-db> (raw)
In-Reply-To: <20100520093440.GK4164@whitby.uk.xensource.com>
On Thu, 2010-05-20 at 17:34 +0800, Tim Deegan wrote:
> At 10:41 +0100 on 22 Apr (1271932875), Qing He wrote:
> > In nested virtualization, the L0 controls may not be the same
> > with controls in physical VMCS.
> > Explict maintain guest controls in variables and use wrappers
> > for control update, do not rely on physical control value.
> >
> > Signed-off-by: Qing He <qing.he@intel.com>
>
> > diff -r fe49b7452637 -r a0bbec37b529 xen/arch/x86/hvm/vmx/vmcs.c
> > --- a/xen/arch/x86/hvm/vmx/vmcs.c Thu Apr 22 21:49:38 2010 +0800
> > +++ b/xen/arch/x86/hvm/vmx/vmcs.c Thu Apr 22 21:49:38 2010 +0800
> > @@ -737,10 +737,10 @@
> > __vmwrite(VMCS_LINK_POINTER_HIGH, ~0UL);
> > #endif
> >
> > - __vmwrite(EXCEPTION_BITMAP,
> > - HVM_TRAP_MASK
> > + v->arch.hvm_vmx.exception_bitmap = HVM_TRAP_MASK
> > | (paging_mode_hap(d) ? 0 : (1U << TRAP_page_fault))
> > - | (1U << TRAP_no_device));
> > + | (1U << TRAP_no_device);
> > + __vmwrite(EXCEPTION_BITMAP, v->arch.hvm_vmx.exception_bitmap);
>
> Shouldn't this use the new vmx_update_exception_bitmap()?
I left it unchanged because it's in vmcs.c. To me, vmx.c is on top of
vmcs.c and I feel against inter-dependeny.
Anyway this feeling is not strong. And I'm fine with using
vmx_update_exception_bitmap here since inter-dependency is already
the case.
Thanks,
Qing
>
> Cheers,
>
> Tim.
>
> --
> Tim Deegan <Tim.Deegan@citrix.com>
> Principal Software Engineer, XenServer Engineering
> Citrix Systems UK Ltd. (Company #02937203, SL9 0BG)
next prev parent reply other threads:[~2010-05-20 9:46 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-22 9:41 [PATCH 00/17][RFC] Nested virtualization for VMX Qing He
2010-04-22 9:41 ` [PATCH 01/17] vmx: nest: fix CR4.VME in update_guest_cr Qing He
2010-05-20 9:26 ` Tim Deegan
2010-05-20 9:36 ` Qing He
2010-04-22 9:41 ` [PATCH 02/17] vmx: nest: rename host_vmcs Qing He
2010-04-22 9:41 ` [PATCH 03/17] vmx: nest: wrapper for control update Qing He
2010-05-20 9:34 ` Tim Deegan
2010-05-20 9:46 ` Qing He [this message]
2010-05-20 12:57 ` Keir Fraser
2010-04-22 9:41 ` [PATCH 04/17] vmx: nest: domain and vcpu flags Qing He
2010-05-20 9:37 ` Tim Deegan
2010-05-20 9:51 ` Christoph Egger
2010-05-20 9:54 ` Qing He
2010-05-20 10:55 ` Tim Deegan
2010-05-20 12:53 ` Qing He
2010-05-20 14:06 ` Christoph Egger
2010-04-22 9:41 ` [PATCH 05/17] vmx: nest: nested control structure Qing He
2010-04-22 9:41 ` [PATCH 06/17] vmx: nest: virtual vmcs layout Qing He
2010-04-22 9:41 ` [PATCH 07/17] vmx: nest: handling VMX instruction exits Qing He
2010-05-20 10:53 ` Tim Deegan
2010-05-20 13:28 ` Qing He
2010-04-22 9:41 ` [PATCH 08/17] vmx: nest: L1 <-> L2 context switch Qing He
2010-05-20 11:11 ` Tim Deegan
2010-05-20 13:49 ` Qing He
2010-05-21 9:19 ` Tim Deegan
2010-05-21 10:31 ` Qing He
2010-05-25 15:27 ` Tim Deegan
2010-04-22 9:41 ` [PATCH 09/17] vmx: nest: interrupt Qing He
2010-05-20 11:21 ` Tim Deegan
2010-05-20 15:55 ` Qing He
2010-04-22 9:41 ` [PATCH 10/17] vmx: nest: VMExit handler in L2 Qing He
2010-05-20 11:44 ` Tim Deegan
2010-05-20 16:06 ` Qing He
2010-05-21 8:42 ` Tim Deegan
2010-05-21 10:35 ` Qing He
2010-05-25 15:34 ` Tim Deegan
2010-04-22 9:41 ` [PATCH 11/17] vmx: nest: L2 tsc Qing He
2010-05-20 11:47 ` Tim Deegan
2010-05-20 16:07 ` Qing He
2010-04-22 9:41 ` [PATCH 12/17] vmx: nest: CR0.TS and #NM Qing He
2010-04-22 9:41 ` [PATCH 13/17] vmx: nest: capability reporting MSRs Qing He
2010-05-20 11:52 ` Tim Deegan
2010-04-22 9:41 ` [PATCH 14/17] vmx: nest: enable virtual VMX Qing He
2010-04-22 9:41 ` [PATCH 15/17] vmx: nest: virtual ept for nested Qing He
2010-05-20 12:21 ` Tim Deegan
2010-05-21 10:24 ` Qing He
2010-05-25 16:02 ` Tim Deegan
2010-04-22 9:41 ` [PATCH 16/17] vmx: nest: hvmtrace " Qing He
2010-04-22 9:41 ` [PATCH 17/17] tools: nest: allow enabling nesting Qing He
2010-04-22 10:15 ` [PATCH 00/17][RFC] Nested virtualization for VMX Christoph Egger
2010-04-23 10:10 ` He, Qing
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