similar to: [PATCH] lguest32 kallsyms backtrace of guest.

plain text document attachment (lguest64-debug-utils.patch) This patch contains some nice features used to debug the lguest64 guest. It has a way to print page tables for either the host or the guest. It incorporates kallsyms, and can do a nice back trace of a guest when it crashes. The guest needs kallsyms obviously compiled in. Note: This code needs to be fixed to be more secure! Implements

plain text document attachment (lguest64-debug-utils.patch) This patch contains some nice features used to debug the lguest64 guest. It has a way to print page tables for either the host or the guest. It incorporates kallsyms, and can do a nice back trace of a guest when it crashes. The guest needs kallsyms obviously compiled in. Note: This code needs to be fixed to be more secure! Implements

plain text document attachment (lguest64.patch) This is the main core code for the lguest64. Have fun, and don't hurt the puppies! Signed-off-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Glauber de Oliveira Costa <glommer@gmail.com> Cc: Chris Wright <chrisw@sous-sol.org> Index: work-pv/arch/x86_64/lguest/Makefile

plain text document attachment (lguest64.patch) This is the main core code for the lguest64. Have fun, and don't hurt the puppies! Signed-off-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Glauber de Oliveira Costa <glommer@gmail.com> Cc: Chris Wright <chrisw@sous-sol.org> Index: work-pv/arch/x86_64/lguest/Makefile

Christoph Hellwig said runs sparse: 1) page_tables.c unnecessary initialization 2) Change prototype of run_lguest and do cast in caller instead (when we add __user to cast, it runs over another line). Al Viro pointed out the ugly cast in push_lguest_stack(): 3) Stick with unsigned long for arg, removes 4 casts in total. Most importantly, I now realize that Christoph's incorrect ranting

Christoph Hellwig said runs sparse: 1) page_tables.c unnecessary initialization 2) Change prototype of run_lguest and do cast in caller instead (when we add __user to cast, it runs over another line). Al Viro pointed out the ugly cast in push_lguest_stack(): 3) Stick with unsigned long for arg, removes 4 casts in total. Most importantly, I now realize that Christoph's incorrect ranting

Currently the lguest32 error messages from bad reads and writes prints a decimal integer for addresses. This is pretty annoying. So this patch changes those to be hex outputs. This is applied on top of my debug patch. Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Index: linux-2.6.21-rc5-mm2/drivers/lguest/core.c =================================================================== ---

Currently the lguest32 error messages from bad reads and writes prints a decimal integer for addresses. This is pretty annoying. So this patch changes those to be hex outputs. This is applied on top of my debug patch. Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Index: linux-2.6.21-rc5-mm2/drivers/lguest/core.c =================================================================== ---

From: Rusty Russell <rusty@rustcorp.com.au> This is the code for the "lg.ko" module, which allows lguest guests to be launched. [akpm@linux-foundation.org: update for futex-new-private-futexes] Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Cc: Andi Kleen <ak@suse.de> Cc: Eric Dumazet <dada1@cosmosbay.com> Signed-off-by: Andrew Morton

From: Rusty Russell <rusty@rustcorp.com.au> This is the code for the "lg.ko" module, which allows lguest guests to be launched. [akpm@linux-foundation.org: update for futex-new-private-futexes] Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Cc: Andi Kleen <ak@suse.de> Cc: Eric Dumazet <dada1@cosmosbay.com> Signed-off-by: Andrew Morton

With all of Xen''s symbols sitting within a 2Gb range on x86-64, they can be referred to by the kallsyms-like offset table using 4- instead of 8-byte slots. The marker table can use 4-byte slots in all cases, just like the table entry counts can (though that''s only a minor improvement). If ia64''s PERCPU_ADDR got moved down to (KERNEL_START + 2Gb - PERCPU_PAGE_SIZE), it

[ Ingo, Thomas cc'd in case this issue effects normal jiffies clock too? ] When the Host TSC is unreliable or can change, lguest guests use the jiffies clock. However, the clock value seems to creep upwards in sub-jiffies increments, and then tick_handle_periodic() goes into an infinite loop. Instead, the host writes the current time into the lguest page on every interrupt. This

[ Ingo, Thomas cc'd in case this issue effects normal jiffies clock too? ] When the Host TSC is unreliable or can change, lguest guests use the jiffies clock. However, the clock value seems to creep upwards in sub-jiffies increments, and then tick_handle_periodic() goes into an infinite loop. Instead, the host writes the current time into the lguest page on every interrupt. This

From: Rusty Russell <rusty@rustcorp.com.au> lguest is a simple hypervisor for Linux on Linux. Unlike kvm it doesn't need VT/SVM hardware. Unlike Xen it's simply "modprobe and go". Unlike both, it's 5000 lines and self-contained. Performance is ok, but not great (-30% on kernel compile). But given its hackability, I expect this to improve, along with the

From: Rusty Russell <rusty@rustcorp.com.au> lguest is a simple hypervisor for Linux on Linux. Unlike kvm it doesn't need VT/SVM hardware. Unlike Xen it's simply "modprobe and go". Unlike both, it's 5000 lines and self-contained. Performance is ok, but not great (-30% on kernel compile). But given its hackability, I expect this to improve, along with the

Lguest currently requires a TSC, which breaks older machines and Matt Mackall who boots the host with "notsc". In addition, there is no good solution to changing TSC speeds (informing all the guests about the TSC impending change before it happens would be a great deal of code and have issues with disobedient guests). This patch makes the host determine if the TSC is both constant and

Lguest currently requires a TSC, which breaks older machines and Matt Mackall who boots the host with "notsc". In addition, there is no good solution to changing TSC speeds (informing all the guests about the TSC impending change before it happens would be a great deal of code and have issues with disobedient guests). This patch makes the host determine if the TSC is both constant and

[Bug that was found by my previous patch] This patch allows things like modules, which don't have a direct __pa(EIP) mapping to do emulated instructions. Sure, the emulated instruction probably should be a paravirt_op, but this patch lets you at least boot a kernel that has modules needing emulated instructions. Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Index:

[Bug that was found by my previous patch] This patch allows things like modules, which don't have a direct __pa(EIP) mapping to do emulated instructions. Sure, the emulated instruction probably should be a paravirt_op, but this patch lets you at least boot a kernel that has modules needing emulated instructions. Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Index:

The new patching code means that we don't actually have to do as much work in lguest's patcher. We use paravirt_patch_default() for cases we don't want to patch inline, which automatically handles the "patch iret to use a direct jump" case. There's no measurable effect on lguest's virtbench scores tho. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> ---