similar to: Question on local_irq_save/local_irq_retore

Hi, I am trying to understand the exception handler of Xen. In xen/arch/x86/x86_64/entry.S, the entry of the page fault handler is : ENTRY(page_fault) movl $TRAP_page_fault,4(%rsp) jmp handle_exception Here I did not get why to put the exception vector ($TRAP_page_fault) to stack before calling handle_exception? Thanks, -- Xinxin

Fairly straightforward code motion in system.h into the sub-arch layer. Affected functionality include control register accessors, which are virtualizable but with great overhead due to the #GP cost; wbinvd, and most importantly, halt and interrupt control, which is non-virtualizable. Since read_cr4_safe can never fault on a VMI kernel (P5+ processor is required for VMI), we can omit the fault

Fairly straightforward code motion in system.h into the sub-arch layer. Affected functionality include control register accessors, which are virtualizable but with great overhead due to the #GP cost; wbinvd, and most importantly, halt and interrupt control, which is non-virtualizable. Since read_cr4_safe can never fault on a VMI kernel (P5+ processor is required for VMI), we can omit the fault

The patch below fixes the recent UML compilation failure in -rc5-mm1 without making the UML build reach further into the i386 headers. It splits the i386 ptrace.h and system.h into UML-usable and UML-unusable pieces. The string "abi" is in there because I did ptrace.h first, and that involves separating the ptrace ABI stuff from everything else (if pt_regs is not considered part of

The patch below fixes the recent UML compilation failure in -rc5-mm1 without making the UML build reach further into the i386 headers. It splits the i386 ptrace.h and system.h into UML-usable and UML-unusable pieces. The string "abi" is in there because I did ptrace.h first, and that involves separating the ptrace ABI stuff from everything else (if pt_regs is not considered part of

I discovered an even more subtle problem; the PnP BIOS code is saving the %fs and %gs segments in inline assembler, yet it also uses the same hack for patching in a fake real mode selector for the BIOS data area. Note that the protected mode selector 0x40 overlaps the user TLS area in the GDT; this means that badly timed PnP BIOS calls could come in, save %fs, come back, and restore %fs -- to

I discovered an even more subtle problem; the PnP BIOS code is saving the %fs and %gs segments in inline assembler, yet it also uses the same hack for patching in a fake real mode selector for the BIOS data area. Note that the protected mode selector 0x40 overlaps the user TLS area in the GDT; this means that badly timed PnP BIOS calls could come in, save %fs, come back, and restore %fs -- to

-------- Original Message -------- Subject: Re: [LLVMdev] Thinking about "whacky" backends Date: Fri, 03 Jun 2011 14:44:05 -0400 From: Nate Fries <nfries88 at yahoo.com> To: Joachim Durchholz <jo at durchholz.org> On 6/3/2011 1:38 PM, Joachim Durchholz wrote: > Am 01.06.2011 23:25, schrieb Nate Fries: >> That said, it seems like it ought to be possible to do

It seems that all current callers have interrupts enabled, making the code currently safe but dangerous. Also, fix a trailing whitespace issue. Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> diff -r 8b93ac0c93f3 -r f3adcb7d84ea xen/arch/x86/nmi.c --- a/xen/arch/x86/nmi.c +++ b/xen/arch/x86/nmi.c @@ -482,13 +482,14 @@ void nmi_watchdog_tick(struct cpu_user_r * 8-3 and 8-4 in

Add a semaphore to protect gnttab_list from exhaustion, and disable callbacks during allocation/free. Fix the network frontend accordingly. Signed-off-by: Samuel Thibault <samuel.thibault@citrix.com> diff -r bb961bda7eff extras/mini-os/gnttab.c --- a/extras/mini-os/gnttab.c Sun Nov 25 21:24:48 2007 +0000 +++ b/extras/mini-os/gnttab.c Mon Nov 26 11:50:31 2007 +0000 @@ -18,6 +18,7 @@

From: xxgreat@hotmail.com To: r-help-bounces@r-project.org Subject: compare a vector and a row of a matrix Date: Sun, 26 Sep 2010 23:23:52 +0800 Hi Everyone: I am trying to compare a vector and rows of a matrix for example > xn <- c(1,2,4,4,5,5,5,6) >yn <- c(1,2,5,7,1,2,3,1) >mtrx <- cbind(xn, yn) when I tried, say, > c (1,4), the result was TRUE, TRUE.

Hi everyone: ¡¡I am new to R and I have a really basic question. I have already got a generalized linear model from some dataset, say y=b0 + b1X1 + b2X2. Then I want to get the value of y provided, say, X1=1, X2=2. And the confidence Intervals of this y. I know I can just calculate that since I know the model already. But is there some code that can calculate those automatically?

Hi everyone: I have a kinda easy question but i do not know how to solve that in a simple way. I want to compare the rows of two matrices. col1 <- c(1,2,3,4,5,6) col2 <- c(6,5,4,3,2,1) m <- cbind(col1, col2) col3 <- c(1,3,2,6) col4 <- c(6,3,5,1) n <- cbind(col3, col4) In matrix n, for example the first row is (1,6), it is also some row

Add SMP support to Xen host S3 Signed-off-by Kevin Tian <kevin.tian@intel.com> diff -r 1539f5a2b3ba xen/arch/x86/acpi/power.c --- a/xen/arch/x86/acpi/power.c Tue Jun 26 18:05:22 2007 -0400 +++ b/xen/arch/x86/acpi/power.c Tue Jun 26 19:44:36 2007 -0400 @@ -25,6 +25,7 @@ #include <xen/sched.h> #include <xen/domain.h> #include <xen/console.h> +#include

On Thu, Aug 06, 2020 at 09:47:23AM +0200, Marco Elver wrote: > Testing my hypothesis that raw then nested non-raw > local_irq_save/restore() breaks IRQ state tracking -- see the reproducer > below. This is at least 1 case I can think of that we're bound to hit. Aaargh! > diff --git a/init/main.c b/init/main.c > index 15bd0efff3df..0873319dcff4 100644 > --- a/init/main.c

On Wed, Aug 12, 2020 at 10:06:50AM +0200, Marco Elver wrote: > On Tue, Aug 11, 2020 at 10:17PM +0200, peterz at infradead.org wrote: > > On Tue, Aug 11, 2020 at 11:46:51AM +0200, peterz at infradead.org wrote: > > > > > So let me once again see if I can't find a better solution for this all. > > > Clearly it needs one :/ > > > > So the below boots

On 11.08.20 09:00, Marco Elver wrote: > On Fri, 7 Aug 2020 at 17:19, Marco Elver <elver at google.com> wrote: >> On Fri, Aug 07, 2020 at 02:08PM +0200, Marco Elver wrote: >>> On Fri, 7 Aug 2020 at 14:04, J?rgen Gro? <jgross at suse.com> wrote: >>>> >>>> On 07.08.20 13:38, Marco Elver wrote: >>>>> On Fri, Aug 07, 2020 at 12:35PM

(added various kvm/virtualization lists in Cc as well as qemu as I don't know who's "wrong" here) Pavel Tatashin wrote on Thu, Jul 19, 2018: > Allow sched_clock() to be used before schec_clock_init() is called. > This provides with a way to get early boot timestamps on machines with > unstable clocks. This isn't something I understand, but bisect tells me this

Wei Liu <wei.liu at kernel.org> writes: > They are used to deposit pages into Microsoft Hypervisor and bring up > logical and virtual processors. > > Signed-off-by: Lillian Grassin-Drake <ligrassi at microsoft.com> > Signed-off-by: Sunil Muthuswamy <sunilmut at microsoft.com> > Signed-off-by: Nuno Das Neves <nudasnev at microsoft.com> >

Index: linux-2.6.13/include/asm-i386/desc.h =================================================================== --- linux-2.6.13.orig/include/asm-i386/desc.h 2005-08-08 17:15:56.000000000 -0700 +++ linux-2.6.13/include/asm-i386/desc.h 2005-08-08 17:16:07.000000000 -0700 @@ -21,6 +21,8 @@ extern struct desc_struct cpu_gdt_table[GDT_ENTRIES]; DECLARE_PER_CPU(struct desc_struct,