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From: Avi Kivity <avi@redhat.com>
To: "Nadav Har'El" <nyh@math.technion.ac.il>
Cc: Joerg Roedel <joro@8bytes.org>, Gleb Natapov <gleb@redhat.com>,
	kvm@vger.kernel.org, abelg@il.ibm.com
Subject: Re: [PATCH 0/30] nVMX: Nested VMX, v9
Date: Mon, 23 May 2011 18:23:16 +0300	[thread overview]
Message-ID: <4DDA7BE4.3040108@redhat.com> (raw)
In-Reply-To: <20110523144404.GA21539@fermat.math.technion.ac.il>

On 05/23/2011 05:44 PM, Nadav Har'El wrote:
> On Mon, May 23, 2011, Avi Kivity wrote about "Re: [PATCH 0/30] nVMX: Nested VMX, v9":
> >  vmcs01 and vmcs02 will both be generated from vmcs12.
>
> If you don't do a clean nested exit (from L2 to L1), vmcs02 can't be generated
> from vmcs12... while L2 runs, it is possible that it modifies vmcs02 (e.g.,
> non-trapped bits of guest_cr0), and these modifications are not copied back
> to vmcs12 until the nested exit (when prepare_vmcs12() is called to perform
> this task).
>
> If you do a nested exit (a "fake" one), vmcs12 is made up to date, and then
> indeed vmcs02 can be thrown away and regenerated.

You would flush this state back to the vmcs.  But that just confirms 
Joerg's statement that a fake vmexit/vmrun is more or less equivalent.

The question is whether %rip points to the VMRUN/VMLAUNCH instruction, 
HOST_RIP (or the next instruction for svm), or to guest code.  But the 
actual things we need to do are all very similar subsets of a vmexit.

-- 
error compiling committee.c: too many arguments to function


  reply	other threads:[~2011-05-23 15:23 UTC|newest]

Thread overview: 83+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-05-08  8:15 [PATCH 0/30] nVMX: Nested VMX, v9 Nadav Har'El
2011-05-08  8:15 ` [PATCH 01/30] nVMX: Add "nested" module option to kvm_intel Nadav Har'El
2011-05-08  8:16 ` [PATCH 02/30] nVMX: Implement VMXON and VMXOFF Nadav Har'El
2011-05-08  8:16 ` [PATCH 03/30] nVMX: Allow setting the VMXE bit in CR4 Nadav Har'El
2011-05-08  8:17 ` [PATCH 04/30] nVMX: Introduce vmcs12: a VMCS structure for L1 Nadav Har'El
2011-05-08  8:17 ` [PATCH 05/30] nVMX: Implement reading and writing of VMX MSRs Nadav Har'El
2011-05-08  8:18 ` [PATCH 06/30] nVMX: Decoding memory operands of VMX instructions Nadav Har'El
2011-05-09  9:47   ` Avi Kivity
2011-05-08  8:18 ` [PATCH 07/30] nVMX: Introduce vmcs02: VMCS used to run L2 Nadav Har'El
2011-05-16 15:30   ` Marcelo Tosatti
2011-05-16 18:32     ` Nadav Har'El
2011-05-17 13:20       ` Marcelo Tosatti
2011-05-08  8:19 ` [PATCH 08/30] nVMX: Fix local_vcpus_link handling Nadav Har'El
2011-05-08  8:19 ` [PATCH 09/30] nVMX: Add VMCS fields to the vmcs12 Nadav Har'El
2011-05-08  8:20 ` [PATCH 10/30] nVMX: Success/failure of VMX instructions Nadav Har'El
2011-05-08  8:20 ` [PATCH 11/30] nVMX: Implement VMCLEAR Nadav Har'El
2011-05-08  8:21 ` [PATCH 12/30] nVMX: Implement VMPTRLD Nadav Har'El
2011-05-16 14:34   ` Marcelo Tosatti
2011-05-16 18:58     ` Nadav Har'El
2011-05-16 19:09       ` Nadav Har'El
2011-05-08  8:21 ` [PATCH 13/30] nVMX: Implement VMPTRST Nadav Har'El
2011-05-08  8:22 ` [PATCH 14/30] nVMX: Implement VMREAD and VMWRITE Nadav Har'El
2011-05-08  8:22 ` [PATCH 15/30] nVMX: Move host-state field setup to a function Nadav Har'El
2011-05-09  9:56   ` Avi Kivity
2011-05-09 10:40     ` Nadav Har'El
2011-05-08  8:23 ` [PATCH 16/30] nVMX: Move control field setup to functions Nadav Har'El
2011-05-08  8:23 ` [PATCH 17/30] nVMX: Prepare vmcs02 from vmcs01 and vmcs12 Nadav Har'El
2011-05-09 10:12   ` Avi Kivity
2011-05-09 10:27     ` Nadav Har'El
2011-05-09 10:45       ` Avi Kivity
2011-05-08  8:24 ` [PATCH 18/30] nVMX: Implement VMLAUNCH and VMRESUME Nadav Har'El
2011-05-08  8:24 ` [PATCH 19/30] nVMX: No need for handle_vmx_insn function any more Nadav Har'El
2011-05-08  8:25 ` [PATCH 20/30] nVMX: Exiting from L2 to L1 Nadav Har'El
2011-05-09 10:45   ` Avi Kivity
2011-05-08  8:25 ` [PATCH 21/30] nVMX: Deciding if L0 or L1 should handle an L2 exit Nadav Har'El
2011-05-08  8:26 ` [PATCH 22/30] nVMX: Correct handling of interrupt injection Nadav Har'El
2011-05-09 10:57   ` Avi Kivity
2011-05-08  8:27 ` [PATCH 23/30] nVMX: Correct handling of exception injection Nadav Har'El
2011-05-08  8:27 ` [PATCH 24/30] nVMX: Correct handling of idt vectoring info Nadav Har'El
2011-05-09 11:04   ` Avi Kivity
2011-05-08  8:28 ` [PATCH 25/30] nVMX: Handling of CR0 and CR4 modifying instructions Nadav Har'El
2011-05-08  8:28 ` [PATCH 26/30] nVMX: Further fixes for lazy FPU loading Nadav Har'El
2011-05-08  8:29 ` [PATCH 27/30] nVMX: Additional TSC-offset handling Nadav Har'El
2011-05-09 17:27   ` Zachary Amsden
2011-05-08  8:29 ` [PATCH 28/30] nVMX: Add VMX to list of supported cpuid features Nadav Har'El
2011-05-08  8:30 ` [PATCH 29/30] nVMX: Miscellenous small corrections Nadav Har'El
2011-05-08  8:30 ` [PATCH 30/30] nVMX: Documentation Nadav Har'El
2011-05-09 11:18 ` [PATCH 0/30] nVMX: Nested VMX, v9 Avi Kivity
2011-05-09 11:37   ` Nadav Har'El
2011-05-11  8:20   ` Gleb Natapov
2011-05-12 15:42     ` Nadav Har'El
2011-05-12 15:57       ` Gleb Natapov
2011-05-12 16:08         ` Avi Kivity
2011-05-12 16:14           ` Gleb Natapov
2011-05-12 16:31         ` Nadav Har'El
2011-05-12 16:51           ` Gleb Natapov
2011-05-12 17:00             ` Avi Kivity
2011-05-15 23:11               ` Nadav Har'El
2011-05-16  6:38                 ` Gleb Natapov
2011-05-16  7:44                   ` Nadav Har'El
2011-05-16  7:57                     ` Gleb Natapov
2011-05-16  9:50                 ` Avi Kivity
2011-05-16 10:20                   ` Avi Kivity
2011-05-22 19:32             ` Nadav Har'El
2011-05-23  9:37               ` Joerg Roedel
2011-05-23  9:52               ` Avi Kivity
2011-05-23 13:02                 ` Joerg Roedel
2011-05-23 13:08                   ` Avi Kivity
2011-05-23 13:40                     ` Joerg Roedel
2011-05-23 13:52                       ` Avi Kivity
2011-05-23 14:10                         ` Nadav Har'El
2011-05-23 14:32                           ` Avi Kivity
2011-05-23 14:44                             ` Nadav Har'El
2011-05-23 15:23                               ` Avi Kivity [this message]
2011-05-23 18:06                                 ` Alexander Graf
2011-05-24 11:09                                   ` Avi Kivity
2011-05-24 13:07                                     ` Joerg Roedel
2011-05-23 14:28                         ` Joerg Roedel
2011-05-23 14:34                           ` Avi Kivity
2011-05-23 14:58                             ` Joerg Roedel
2011-05-23 15:19                               ` Avi Kivity
2011-05-23 13:18                   ` Nadav Har'El
2011-05-12 16:18       ` Avi Kivity

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