* Re: x86_64 : kernel initial decompression hangs on vmware
@ 2007-10-10 7:37 ` Fengguang Wu
2007-10-10 13:18 ` Andi Kleen
0 siblings, 1 reply; 5+ messages in thread
From: Fengguang Wu @ 2007-10-10 7:37 UTC (permalink / raw)
To: Zachary Amsden; +Cc: Avi Kivity, lkml, Andi Kleen, david-g
Hi Zachary,
One of my friends' vmware "hangs" on booting Linux 2.6.23, and then get
it to work by applying your patch at http://lkml.org/lkml/2007/8/4/72.
It would be nice to see your fix going into mainline :-)
Thank you,
Fengguang
---
PS. the original patch:
VT is very picky about when it can enter execution.
Get all segments setup and get LDT and TR into valid state to allow
VT execution under VMware and KVM (untested).
This makes the boot decompression run under VT, which makes it several
orders of magnitude faster on 64-bit Intel hardware.
Before, I was seeing times up to a minute or more to decompress a 1.3MB kernel
on a very fast box.
Signed-off-by: Zachary Amsden <zach@vmware.com>
===================================================================
--- a/arch/x86_64/boot/compressed/head.S
+++ a/arch/x86_64/boot/compressed/head.S
@@ -195,6 +195,11 @@
movl %eax, %ds
movl %eax, %es
movl %eax, %ss
+ movl %eax, %fs
+ movl %eax, %gs
+ lldt %ax
+ movl $0x20, %eax
+ ltr %ax
/* Compute the decompressed kernel start address. It is where
* we were loaded at aligned to a 2M boundary. %rbp contains the
@@ -295,6 +300,8 @@
.quad 0x0000000000000000 /* NULL descriptor */
.quad 0x00af9a000000ffff /* __KERNEL_CS */
.quad 0x00cf92000000ffff /* __KERNEL_DS */
+ .quad 0x0080890000000000 /* TS descriptor */
+ .quad 0x0000000000000000 /* TS continued */
gdt_end:
.bss
/* Stack for uncompression */
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: x86_64 : kernel initial decompression hangs on vmware
@ 2007-10-10 7:37 ` Fengguang Wu
2007-10-10 13:18 ` Andi Kleen
0 siblings, 1 reply; 5+ messages in thread
From: Fengguang Wu @ 2007-10-10 7:37 UTC (permalink / raw)
To: Zachary Amsden; +Cc: Avi Kivity, lkml, Andi Kleen, david-g
Hi Zachary,
One of my friends' vmware "hangs" on booting Linux 2.6.23, and then get
it to work by applying your patch at http://lkml.org/lkml/2007/8/4/72.
It would be nice to see your fix going into mainline :-)
Thank you,
Fengguang
---
PS. the original patch:
VT is very picky about when it can enter execution.
Get all segments setup and get LDT and TR into valid state to allow
VT execution under VMware and KVM (untested).
This makes the boot decompression run under VT, which makes it several
orders of magnitude faster on 64-bit Intel hardware.
Before, I was seeing times up to a minute or more to decompress a 1.3MB kernel
on a very fast box.
Signed-off-by: Zachary Amsden <zach@vmware.com>
===================================================================
--- a/arch/x86_64/boot/compressed/head.S
+++ a/arch/x86_64/boot/compressed/head.S
@@ -195,6 +195,11 @@
movl %eax, %ds
movl %eax, %es
movl %eax, %ss
+ movl %eax, %fs
+ movl %eax, %gs
+ lldt %ax
+ movl $0x20, %eax
+ ltr %ax
/* Compute the decompressed kernel start address. It is where
* we were loaded at aligned to a 2M boundary. %rbp contains the
@@ -295,6 +300,8 @@
.quad 0x0000000000000000 /* NULL descriptor */
.quad 0x00af9a000000ffff /* __KERNEL_CS */
.quad 0x00cf92000000ffff /* __KERNEL_DS */
+ .quad 0x0080890000000000 /* TS descriptor */
+ .quad 0x0000000000000000 /* TS continued */
gdt_end:
.bss
/* Stack for uncompression */
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: x86_64 : kernel initial decompression hangs on vmware
2007-10-10 7:37 ` Fengguang Wu
@ 2007-10-10 13:18 ` Andi Kleen
2007-10-10 20:32 ` Fengguang Wu
0 siblings, 1 reply; 5+ messages in thread
From: Andi Kleen @ 2007-10-10 13:18 UTC (permalink / raw)
To: Fengguang Wu; +Cc: Zachary Amsden, Avi Kivity, lkml, david-g
On Wednesday 10 October 2007 09:37:39 Fengguang Wu wrote:
> One of my friends' vmware "hangs"
It should just be a little slow. VMware seems to do something fishy
here -- KVM or Xen using VT don't have this issue.
> on booting Linux 2.6.23, and then get
> it to work by applying your patch at http://lkml.org/lkml/2007/8/4/72.
The patch is already in 2.6.23; it was just missing in .22. Perhaps
your friend confused those two.
-Andi
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: x86_64 : kernel initial decompression hangs on vmware
@ 2007-10-10 20:32 ` Fengguang Wu
0 siblings, 0 replies; 5+ messages in thread
From: Fengguang Wu @ 2007-10-10 20:32 UTC (permalink / raw)
To: Andi Kleen; +Cc: Zachary Amsden, Avi Kivity, lkml, david-g
On Wed, Oct 10, 2007 at 03:18:42PM +0200, Andi Kleen wrote:
> On Wednesday 10 October 2007 09:37:39 Fengguang Wu wrote:
>
> > One of my friends' vmware "hangs"
>
> It should just be a little slow. VMware seems to do something fishy
> here -- KVM or Xen using VT don't have this issue.
Yeah, it's a false hang ;-)
> > on booting Linux 2.6.23, and then get
> > it to work by applying your patch at http://lkml.org/lkml/2007/8/4/72.
>
> The patch is already in 2.6.23; it was just missing in .22. Perhaps
> your friend confused those two.
Ah indeed. Sorry for the noise.
Fengguang
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: x86_64 : kernel initial decompression hangs on vmware
@ 2007-10-10 20:32 ` Fengguang Wu
0 siblings, 0 replies; 5+ messages in thread
From: Fengguang Wu @ 2007-10-10 20:32 UTC (permalink / raw)
To: Andi Kleen; +Cc: Zachary Amsden, Avi Kivity, lkml, david-g
On Wed, Oct 10, 2007 at 03:18:42PM +0200, Andi Kleen wrote:
> On Wednesday 10 October 2007 09:37:39 Fengguang Wu wrote:
>
> > One of my friends' vmware "hangs"
>
> It should just be a little slow. VMware seems to do something fishy
> here -- KVM or Xen using VT don't have this issue.
Yeah, it's a false hang ;-)
> > on booting Linux 2.6.23, and then get
> > it to work by applying your patch at http://lkml.org/lkml/2007/8/4/72.
>
> The patch is already in 2.6.23; it was just missing in .22. Perhaps
> your friend confused those two.
Ah indeed. Sorry for the noise.
Fengguang
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: x86_64 : kernel initial decompression hangs on vmware
@ 2007-10-10 19:16 ` Zachary Amsden
2007-10-10 21:15 ` Fengguang Wu
0 siblings, 1 reply; 5+ messages in thread
From: Zachary Amsden @ 2007-10-10 19:16 UTC (permalink / raw)
To: Fengguang Wu; +Cc: Avi Kivity, lkml, Andi Kleen, david-g
On Wed, 2007-10-10 at 15:37 +0800, Fengguang Wu wrote:
> Hi Zachary,
>
> One of my friends' vmware "hangs" on booting Linux 2.6.23, and then get
> it to work by applying your patch at http://lkml.org/lkml/2007/8/4/72.
>
> It would be nice to see your fix going into mainline :-)
I thought that patch already went into mainline in 2.6.23? If not, it
would be nice to queue it for -stable (also for 2.6.22).
Zach
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: x86_64 : kernel initial decompression hangs on vmware
@ 2007-10-10 21:15 ` Fengguang Wu
0 siblings, 0 replies; 5+ messages in thread
From: Fengguang Wu @ 2007-10-10 21:15 UTC (permalink / raw)
To: Zachary Amsden; +Cc: Avi Kivity, lkml, Andi Kleen, david-g
On Wed, Oct 10, 2007 at 12:16:30PM -0700, Zachary Amsden wrote:
> On Wed, 2007-10-10 at 15:37 +0800, Fengguang Wu wrote:
> > Hi Zachary,
> >
> > One of my friends' vmware "hangs" on booting Linux 2.6.23, and then get
> > it to work by applying your patch at http://lkml.org/lkml/2007/8/4/72.
> >
> > It would be nice to see your fix going into mainline :-)
>
> I thought that patch already went into mainline in 2.6.23? If not, it
Sorry, the problematic kernel was 2.6.22.
> would be nice to queue it for -stable (also for 2.6.22).
Agreed.
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: x86_64 : kernel initial decompression hangs on vmware
@ 2007-10-10 21:15 ` Fengguang Wu
0 siblings, 0 replies; 5+ messages in thread
From: Fengguang Wu @ 2007-10-10 21:15 UTC (permalink / raw)
To: Zachary Amsden; +Cc: Avi Kivity, lkml, Andi Kleen, david-g
On Wed, Oct 10, 2007 at 12:16:30PM -0700, Zachary Amsden wrote:
> On Wed, 2007-10-10 at 15:37 +0800, Fengguang Wu wrote:
> > Hi Zachary,
> >
> > One of my friends' vmware "hangs" on booting Linux 2.6.23, and then get
> > it to work by applying your patch at http://lkml.org/lkml/2007/8/4/72.
> >
> > It would be nice to see your fix going into mainline :-)
>
> I thought that patch already went into mainline in 2.6.23? If not, it
Sorry, the problematic kernel was 2.6.22.
> would be nice to queue it for -stable (also for 2.6.22).
Agreed.
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2007-10-10 21:15 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2007-10-10 7:37 x86_64 : kernel initial decompression hangs on vmware Fengguang Wu
2007-10-10 7:37 ` Fengguang Wu
2007-10-10 13:18 ` Andi Kleen
2007-10-10 20:32 ` Fengguang Wu
2007-10-10 20:32 ` Fengguang Wu
2007-10-10 19:16 ` Zachary Amsden
2007-10-10 21:15 ` Fengguang Wu
2007-10-10 21:15 ` Fengguang Wu
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.