Re: [PATCH 9/24] Implement VMCLEAR

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From: Nadav Har'El

Subject: Re: [PATCH 9/24] Implement VMCLEAR

Date: Thursday, August 5, 2010 - 5:10 am

On Thu, Aug 05, 2010, Avi Kivity wrote about "Re: [PATCH 9/24] Implement VMCLEAR":
quoted text> As far as the processor is concerned, there is no end to physical 
> memory.  The VMCLEAR will write some stuff out, and the chipset will 
> throw it away.

So isn't what you're saying that for accurate VMCLEAR emulation, I should
simply ignore this error and have VMCLEAR do nothing in this case?

quoted text>  However, eventually the guest will crash and burn, 
> better to take it out in a controlled way.

Isn't it concievable that some poorly-written hypervisor actually VMCLEARs
something beyond available memory, and doesn't crash because it never tries
to actually use that memory later? Do you think it's a good idea to kill
the guest immediately, in anticipation of a crash that will most likely come
later?

Thanks,
Nadav.

-- 
Nadav Har'El                        |        Thursday, Aug  5 2010, 25 Av 5770
nyh@math.technion.ac.il             |-----------------------------------------
Phone +972-523-790466, ICQ 13349191 |Tact is the art of making a point without
http://nadav.harel.org.il           |making an enemy.
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Messages in current thread:

[PATCH 0/24] Nested VMX, v5, Nadav Har'El, (Sun Jun 13, 5:22 am)

[PATCH 1/24] Move nested option from svm.c to x86.c, Nadav Har'El, (Sun Jun 13, 5:23 am)

[PATCH 2/24] Add VMX and SVM to list of supported cpuid fe ..., Nadav Har'El, (Sun Jun 13, 5:23 am)

[PATCH 3/24] Implement VMXON and VMXOFF, Nadav Har'El, (Sun Jun 13, 5:24 am)

[PATCH 4/24] Allow setting the VMXE bit in CR4, Nadav Har'El, (Sun Jun 13, 5:24 am)

[PATCH 5/24] Introduce vmcs12: a VMCS structure for L1, Nadav Har'El, (Sun Jun 13, 5:25 am)

[PATCH 6/24] Implement reading and writing of VMX MSRs, Nadav Har'El, (Sun Jun 13, 5:25 am)

[PATCH 7/24] Understanding guest pointers to vmcs12 structures, Nadav Har'El, (Sun Jun 13, 5:26 am)

[PATCH 8/24] Hold a vmcs02 for each vmcs12, Nadav Har'El, (Sun Jun 13, 5:26 am)

[PATCH 9/24] Implement VMCLEAR, Nadav Har'El, (Sun Jun 13, 5:27 am)

[PATCH 10/24] Implement VMPTRLD, Nadav Har'El, (Sun Jun 13, 5:27 am)

[PATCH 11/24] Implement VMPTRST, Nadav Har'El, (Sun Jun 13, 5:28 am)

[PATCH 12/24] Add VMCS fields to the vmcs12, Nadav Har'El, (Sun Jun 13, 5:28 am)

[PATCH 13/24] Implement VMREAD and VMWRITE, Nadav Har'El, (Sun Jun 13, 5:29 am)

[PATCH 14/24] Prepare vmcs02 from vmcs01 and vmcs12, Nadav Har'El, (Sun Jun 13, 5:29 am)

[PATCH 15/24] Move register-syncing to a function, Nadav Har'El, (Sun Jun 13, 5:30 am)

[PATCH 16/24] Implement VMLAUNCH and VMRESUME, Nadav Har'El, (Sun Jun 13, 5:30 am)

[PATCH 17/24] No need for handle_vmx_insn function any more, Nadav Har'El, (Sun Jun 13, 5:31 am)

[PATCH 18/24] Exiting from L2 to L1, Nadav Har'El, (Sun Jun 13, 5:31 am)

[PATCH 19/24] Deciding if L0 or L1 should handle an L2 exit, Nadav Har'El, (Sun Jun 13, 5:32 am)

[PATCH 20/24] Correct handling of interrupt injection, Nadav Har'El, (Sun Jun 13, 5:32 am)

[PATCH 21/24] Correct handling of exception injection, Nadav Har'El, (Sun Jun 13, 5:33 am)

[PATCH 22/24] Correct handling of idt vectoring info, Nadav Har'El, (Sun Jun 13, 5:33 am)

[PATCH 23/24] Handling of CR0.TS and #NM for Lazy FPU loading, Nadav Har'El, (Sun Jun 13, 5:34 am)

[PATCH 24/24] Miscellenous small corrections, Nadav Har'El, (Sun Jun 13, 5:34 am)

Re: [PATCH 1/24] Move nested option from svm.c to x86.c, Avi Kivity, (Mon Jun 14, 1:11 am)

Re: [PATCH 2/24] Add VMX and SVM to list of supported cpui ..., Avi Kivity, (Mon Jun 14, 1:13 am)

Re: [PATCH 3/24] Implement VMXON and VMXOFF, Avi Kivity, (Mon Jun 14, 1:21 am)

Re: [PATCH 5/24] Introduce vmcs12: a VMCS structure for L1, Avi Kivity, (Mon Jun 14, 1:33 am)

Re: [PATCH 6/24] Implement reading and writing of VMX MSRs, Avi Kivity, (Mon Jun 14, 1:42 am)

Re: [PATCH 7/24] Understanding guest pointers to vmcs12 st ..., Avi Kivity, (Mon Jun 14, 1:48 am)

Re: [PATCH 5/24] Introduce vmcs12: a VMCS structure for L1, Nadav Har'El, (Mon Jun 14, 1:49 am)

Re: [PATCH 8/24] Hold a vmcs02 for each vmcs12, Avi Kivity, (Mon Jun 14, 1:57 am)

Re: [PATCH 9/24] Implement VMCLEAR, Avi Kivity, (Mon Jun 14, 2:03 am)

Re: [PATCH 10/24] Implement VMPTRLD, Avi Kivity, (Mon Jun 14, 2:07 am)

Re: [PATCH 11/24] Implement VMPTRST, Avi Kivity, (Mon Jun 14, 2:15 am)

Re: [PATCH 12/24] Add VMCS fields to the vmcs12, Avi Kivity, (Mon Jun 14, 2:24 am)

Re: [PATCH 13/24] Implement VMREAD and VMWRITE, Avi Kivity, (Mon Jun 14, 2:36 am)

Re: [PATCH 14/24] Prepare vmcs02 from vmcs01 and vmcs12, Avi Kivity, (Mon Jun 14, 4:11 am)

Re: [PATCH 16/24] Implement VMLAUNCH and VMRESUME, Avi Kivity, (Mon Jun 14, 4:41 am)

Re: [PATCH 18/24] Exiting from L2 to L1, Avi Kivity, (Mon Jun 14, 5:04 am)

Re: [PATCH 19/24] Deciding if L0 or L1 should handle an L2 ..., Avi Kivity, (Mon Jun 14, 5:24 am)

Re: [PATCH 20/24] Correct handling of interrupt injection, Avi Kivity, (Mon Jun 14, 5:29 am)

Re: [PATCH 0/24] Nested VMX, v5, Avi Kivity, (Mon Jun 14, 5:34 am)

Re: [PATCH 5/24] Introduce vmcs12: a VMCS structure for L1, Avi Kivity, (Mon Jun 14, 5:35 am)

Re: [PATCH 20/24] Correct handling of interrupt injection, Avi Kivity, (Mon Jun 14, 5:48 am)

Re: [PATCH 0/24] Nested VMX, v5, Nadav Har'El, (Mon Jun 14, 6:03 am)

Re: [PATCH 0/24] Nested VMX, v5, Avi Kivity, (Tue Jun 15, 3:00 am)

Re: [PATCH 4/24] Allow setting the VMXE bit in CR4, Gleb Natapov, (Tue Jun 15, 4:09 am)

Re: [PATCH 7/24] Understanding guest pointers to vmcs12 st ..., Gleb Natapov, (Tue Jun 15, 5:14 am)

Re: [PATCH 9/24] Implement VMCLEAR, Gleb Natapov, (Tue Jun 15, 6:47 am)

Re: [PATCH 9/24] Implement VMCLEAR, Avi Kivity, (Tue Jun 15, 6:50 am)

Re: [PATCH 9/24] Implement VMCLEAR, Gleb Natapov, (Tue Jun 15, 6:54 am)

Re: [PATCH 1/24] Move nested option from svm.c to x86.c, Nadav Har'El, (Tue Jun 15, 7:27 am)

Re: [PATCH 2/24] Add VMX and SVM to list of supported cpui ..., Nadav Har'El, (Tue Jun 15, 7:31 am)

Re: [PATCH 4/24] Allow setting the VMXE bit in CR4, Nadav Har'El, (Tue Jun 15, 7:44 am)

Re: [PATCH 3/24] Implement VMXON and VMXOFF, Marcelo Tosatti, (Tue Jun 15, 1:18 pm)

Re: [PATCH 3/24] Implement VMXON and VMXOFF, Nadav Har'El, (Wed Jun 16, 12:50 am)

Re: [PATCH 3/24] Implement VMXON and VMXOFF, Nadav Har'El, (Wed Jun 16, 4:14 am)

Re: [PATCH 3/24] Implement VMXON and VMXOFF, Avi Kivity, (Wed Jun 16, 4:26 am)

Re: [PATCH 5/24] Introduce vmcs12: a VMCS structure for L1, Nadav Har'El, (Wed Jun 16, 5:24 am)

Re: [PATCH 5/24] Introduce vmcs12: a VMCS structure for L1, Avi Kivity, (Wed Jun 16, 6:10 am)

Re: [PATCH 10/24] Implement VMPTRLD, Gleb Natapov, (Wed Jun 16, 6:36 am)

Re: [PATCH 11/24] Implement VMPTRST, Gleb Natapov, (Wed Jun 16, 6:53 am)

Re: [PATCH 12/24] Add VMCS fields to the vmcs12, Gleb Natapov, (Wed Jun 16, 7:18 am)

Re: [PATCH 13/24] Implement VMREAD and VMWRITE, Gleb Natapov, (Wed Jun 16, 7:48 am)

Re: [PATCH 13/24] Implement VMREAD and VMWRITE, Gleb Natapov, (Wed Jun 16, 8:03 am)

Re: [PATCH 11/24] Implement VMPTRST, Nadav Har'El, (Wed Jun 16, 8:33 am)

Re: [PATCH 14/24] Prepare vmcs02 from vmcs01 and vmcs12, Gleb Natapov, (Thu Jun 17, 1:50 am)

Re: [PATCH 16/24] Implement VMLAUNCH and VMRESUME, Gleb Natapov, (Thu Jun 17, 3:59 am)

Re: [PATCH 22/24] Correct handling of idt vectoring info, Gleb Natapov, (Thu Jun 17, 4:58 am)

Re: [PATCH 5/24] Introduce vmcs12: a VMCS structure for L1, Nadav Har'El, (Tue Jun 22, 7:54 am)

Re: [PATCH 5/24] Introduce vmcs12: a VMCS structure for L1, Nadav Har'El, (Tue Jun 22, 9:53 am)

Re: [PATCH 5/24] Introduce vmcs12: a VMCS structure for L1, Avi Kivity, (Wed Jun 23, 12:57 am)

Re: [PATCH 5/24] Introduce vmcs12: a VMCS structure for L1, Avi Kivity, (Wed Jun 23, 1:07 am)

Re: [PATCH 6/24] Implement reading and writing of VMX MSRs, Nadav Har'El, (Wed Jun 23, 1:13 am)

Re: [PATCH 6/24] Implement reading and writing of VMX MSRs, Avi Kivity, (Wed Jun 23, 1:24 am)

Re: [PATCH 5/24] Introduce vmcs12: a VMCS structure for L1, Alexander Graf, (Wed Jun 23, 2:15 am)

Re: [PATCH 5/24] Introduce vmcs12: a VMCS structure for L1, Avi Kivity, (Wed Jun 23, 2:24 am)

Re: [PATCH 5/24] Introduce vmcs12: a VMCS structure for L1, Nadav Har'El, (Wed Jun 23, 5:07 am)

Re: [PATCH 5/24] Introduce vmcs12: a VMCS structure for L1, Avi Kivity, (Wed Jun 23, 5:13 am)

RE: [PATCH 9/24] Implement VMCLEAR, Dong, Eddie, (Mon Jul 5, 7:56 pm)

RE: [PATCH 10/24] Implement VMPTRLD, Dong, Eddie, (Mon Jul 5, 8:09 pm)

RE: [PATCH 14/24] Prepare vmcs02 from vmcs01 and vmcs12, Dong, Eddie, (Mon Jul 5, 11:25 pm)

RE: [PATCH 8/24] Hold a vmcs02 for each vmcs12, Dong, Eddie, (Tue Jul 6, 2:50 am)

RE: [PATCH 0/24] Nested VMX, v5, Dong, Eddie, (Fri Jul 9, 1:59 am)

Re: [PATCH 0/24] Nested VMX, v5, Nadav Har'El, (Sun Jul 11, 1:27 am)

Re: [PATCH 0/24] Nested VMX, v5, Alexander Graf, (Sun Jul 11, 4:05 am)

Re: [PATCH 0/24] Nested VMX, v5, Nadav Har'El, (Sun Jul 11, 5:49 am)

Re: [PATCH 0/24] Nested VMX, v5, Avi Kivity, (Sun Jul 11, 6:12 am)

Re: [PATCH 0/24] Nested VMX, v5, Avi Kivity, (Sun Jul 11, 6:20 am)

Re: [PATCH 0/24] Nested VMX, v5, Nadav Har'El, (Sun Jul 11, 8:39 am)

Re: [PATCH 0/24] Nested VMX, v5, Avi Kivity, (Sun Jul 11, 8:45 am)

Re: [PATCH 0/24] Nested VMX, v5, Sheng Yang, (Wed Jul 14, 8:27 pm)

Re: [PATCH 7/24] Understanding guest pointers to vmcs12 st ..., Nadav Har'El, (Sun Aug 1, 8:16 am)

Re: [PATCH 7/24] Understanding guest pointers to vmcs12 st ..., Gleb Natapov, (Sun Aug 1, 8:25 am)

Re: [PATCH 7/24] Understanding guest pointers to vmcs12 st ..., Nadav Har'El, (Mon Aug 2, 1:57 am)

Re: [PATCH 7/24] Understanding guest pointers to vmcs12 st ..., Nadav Har'El, (Mon Aug 2, 5:25 am)

Re: [PATCH 7/24] Understanding guest pointers to vmcs12 st ..., Avi Kivity, (Mon Aug 2, 6:38 am)

Re: [PATCH 8/24] Hold a vmcs02 for each vmcs12, Nadav Har'El, (Mon Aug 2, 6:38 am)

Re: [PATCH 9/24] Implement VMCLEAR, Nadav Har'El, (Tue Aug 3, 5:12 am)

Re: [PATCH 13/24] Implement VMREAD and VMWRITE, Nadav Har'El, (Wed Aug 4, 4:46 am)

Re: [PATCH 13/24] Implement VMREAD and VMWRITE, Nadav Har'El, (Wed Aug 4, 6:42 am)

Re: [PATCH 13/24] Implement VMREAD and VMWRITE, Nadav Har'El, (Wed Aug 4, 9:09 am)

Re: [PATCH 13/24] Implement VMREAD and VMWRITE, Avi Kivity, (Wed Aug 4, 9:41 am)

Re: [PATCH 10/24] Implement VMPTRLD, Nadav Har'El, (Thu Aug 5, 4:13 am)

Re: [PATCH 10/24] Implement VMPTRLD, Nadav Har'El, (Thu Aug 5, 4:35 am)

Re: [PATCH 9/24] Implement VMCLEAR, Nadav Har'El, (Thu Aug 5, 4:50 am)

Re: [PATCH 9/24] Implement VMCLEAR, Gleb Natapov, (Thu Aug 5, 4:53 am)

Re: [PATCH 9/24] Implement VMCLEAR, Nadav Har'El, (Thu Aug 5, 5:01 am)

Re: [PATCH 9/24] Implement VMCLEAR, Avi Kivity, (Thu Aug 5, 5:03 am)

Re: [PATCH 9/24] Implement VMCLEAR, Avi Kivity, (Thu Aug 5, 5:05 am)

Re: [PATCH 9/24] Implement VMCLEAR, Nadav Har'El, (Thu Aug 5, 5:10 am)

Re: [PATCH 9/24] Implement VMCLEAR, Avi Kivity, (Thu Aug 5, 5:13 am)

Re: [PATCH 9/24] Implement VMCLEAR, Nadav Har'El, (Thu Aug 5, 5:29 am)

Re: [PATCH 5/24] Introduce vmcs12: a VMCS structure for L1, Nadav Har'El, (Sun Aug 8, 8:09 am)

Re: [PATCH 5/24] Introduce vmcs12: a VMCS structure for L1, Avi Kivity, (Mon Aug 9, 8:24 pm)

Re: [PATCH 18/24] Exiting from L2 to L1, Nadav Har'El, (Sun Sep 12, 7:05 am)

Re: [PATCH 18/24] Exiting from L2 to L1, Avi Kivity, (Sun Sep 12, 7:29 am)

Re: [PATCH 18/24] Exiting from L2 to L1, Nadav Har'El, (Sun Sep 12, 10:05 am)

Re: [PATCH 18/24] Exiting from L2 to L1, Avi Kivity, (Sun Sep 12, 10:21 am)

Re: [PATCH 18/24] Exiting from L2 to L1, Nadav Har'El, (Sun Sep 12, 12:51 pm)

Re: [PATCH 18/24] Exiting from L2 to L1, Sheng Yang, (Sun Sep 12, 10:53 pm)

Re: [PATCH 18/24] Exiting from L2 to L1, Avi Kivity, (Mon Sep 13, 1:48 am)

Re: [PATCH 18/24] Exiting from L2 to L1, Avi Kivity, (Mon Sep 13, 1:52 am)

Re: [PATCH 18/24] Exiting from L2 to L1, Nadav Har'El, (Mon Sep 13, 2:01 am)

Re: [PATCH 18/24] Exiting from L2 to L1, Avi Kivity, (Mon Sep 13, 2:34 am)

Re: [PATCH 18/24] Exiting from L2 to L1, Nadav Har'El, (Tue Sep 14, 6:07 am)

Re: [PATCH 19/24] Deciding if L0 or L1 should handle an L2 ..., Nadav Har'El, (Thu Sep 16, 7:42 am)

Re: [PATCH 20/24] Correct handling of interrupt injection, Nadav Har'El, (Thu Sep 16, 8:25 am)

Re: [PATCH 16/24] Implement VMLAUNCH and VMRESUME, Nadav Har'El, (Thu Sep 16, 9:06 am)

Re: [PATCH 22/24] Correct handling of idt vectoring info, Nadav Har'El, (Sun Sep 19, 11:37 pm)

Re: [PATCH 22/24] Correct handling of idt vectoring info, Gleb Natapov, (Mon Sep 20, 2:34 am)

Re: [PATCH 22/24] Correct handling of idt vectoring info, Nadav Har'El, (Mon Sep 20, 3:03 am)

Re: [PATCH 22/24] Correct handling of idt vectoring info, Avi Kivity, (Mon Sep 20, 3:11 am)

Re: [PATCH 22/24] Correct handling of idt vectoring info, Gleb Natapov, (Mon Sep 20, 3:20 am)

Re: [PATCH 22/24] Correct handling of idt vectoring info, Nadav Har'El, (Wed Sep 22, 4:15 pm)

Re: [PATCH 16/24] Implement VMLAUNCH and VMRESUME, Nadav Har'El, (Sun Sep 26, 4:14 am)

Re: [PATCH 16/24] Implement VMLAUNCH and VMRESUME, Avi Kivity, (Sun Sep 26, 5:56 am)

Re: [PATCH 16/24] Implement VMLAUNCH and VMRESUME, Nadav Har'El, (Sun Sep 26, 6:06 am)

Re: [PATCH 16/24] Implement VMLAUNCH and VMRESUME, Avi Kivity, (Sun Sep 26, 6:51 am)

Re: [PATCH 22/24] Correct handling of idt vectoring info, Avi Kivity, (Sun Sep 26, 8:14 am)

Re: [PATCH 22/24] Correct handling of idt vectoring info, Gleb Natapov, (Sun Sep 26, 8:18 am)

Re: [PATCH 0/24] Nested VMX, v5, Nadav Har'El, (Sun Oct 17, 5:03 am)