On Mon 12.Oct'20 at 12:49:16 -0400, Arvind Sankar wrote:
On Mon, Oct 12, 2020 at 04:44:31PM +0800, Shuo A Liu wrote:
On Wed 30.Sep'20 at 12:14:03 -0700, Nick Desaulniers wrote:
>On Wed, Sep 30, 2020 at 10:13 AM Peter Zijlstra wrote:
>>
>> On Wed, Sep 30, 2020 at 11:10:36AM -0500, Segher Boessen
On Mon, Oct 12, 2020 at 04:44:31PM +0800, Shuo A Liu wrote:
> On Wed 30.Sep'20 at 12:14:03 -0700, Nick Desaulniers wrote:
> >On Wed, Sep 30, 2020 at 10:13 AM Peter Zijlstra wrote:
> >>
> >> On Wed, Sep 30, 2020 at 11:10:36AM -0500, Segher Boessenkool wrote:
> >>
> >> > Since this variable is a loc
On Wed 30.Sep'20 at 12:54:08 +0200, Borislav Petkov wrote:
On Tue, Sep 22, 2020 at 07:42:58PM +0800, shuo.a@intel.com wrote:
From: Shuo Liu
The Service VM communicates with the hypervisor via conventional
hypercalls. VMCALL instruction is used to make the hypercalls.
ACRN hypercall ABI:
On Wed 30.Sep'20 at 12:14:03 -0700, Nick Desaulniers wrote:
On Wed, Sep 30, 2020 at 10:13 AM Peter Zijlstra wrote:
On Wed, Sep 30, 2020 at 11:10:36AM -0500, Segher Boessenkool wrote:
> Since this variable is a local register asm, on entry to the asm the
> compiler guarantees that the value li
On Wed, Sep 30, 2020 at 07:38:15PM -0400, Arvind Sankar wrote:
> On Wed, Sep 30, 2020 at 06:25:59PM -0500, Segher Boessenkool wrote:
> > On Wed, Sep 30, 2020 at 12:14:03PM -0700, Nick Desaulniers wrote:
> > > Do we need register local storage here?
> >
> > Depends what you want. It looks like you
On Wed, Sep 30, 2020 at 03:59:15PM -0400, Arvind Sankar wrote:
> On Wed, Sep 30, 2020 at 12:14:03PM -0700, Nick Desaulniers wrote:
> > On Wed, Sep 30, 2020 at 10:13 AM Peter Zijlstra
> > wrote:
> > >
> > > On Wed, Sep 30, 2020 at 11:10:36AM -0500, Segher Boessenkool wrote:
> > >
> > > > Since thi
On Wed, Sep 30, 2020 at 09:42:40PM +0200, Peter Zijlstra wrote:
> > Looks like yes. You can even check different GCC versions via the
> > dropdown in the top right.
>
> That only tells me it compiles it, not if that (IMO) weird construct is
> actually guaranteed to work as expected.
>
> I'd almos
On Wed, Sep 30, 2020 at 06:25:59PM -0500, Segher Boessenkool wrote:
> On Wed, Sep 30, 2020 at 12:14:03PM -0700, Nick Desaulniers wrote:
> > Do we need register local storage here?
>
> Depends what you want. It looks like you do:
>
> > static inline long bar(unsigned long hcall_id)
> > {
> > lo
On Wed, Sep 30, 2020 at 12:14:03PM -0700, Nick Desaulniers wrote:
> Do we need register local storage here?
Depends what you want. It looks like you do:
> static inline long bar(unsigned long hcall_id)
> {
> long result;
> asm volatile("movl %1, %%r8d\n\t"
> "vmcall\n\t"
> : "=a" (resu
On Wed, Sep 30, 2020 at 03:59:15PM -0400, Arvind Sankar wrote:
> On Wed, Sep 30, 2020 at 12:14:03PM -0700, Nick Desaulniers wrote:
> > On Wed, Sep 30, 2020 at 10:13 AM Peter Zijlstra
> > wrote:
> > >
> > > On Wed, Sep 30, 2020 at 11:10:36AM -0500, Segher Boessenkool wrote:
> > >
> > > > Since thi
On Wed, Sep 30, 2020 at 12:14:03PM -0700, Nick Desaulniers wrote:
> On Wed, Sep 30, 2020 at 10:13 AM Peter Zijlstra wrote:
> >
> > On Wed, Sep 30, 2020 at 11:10:36AM -0500, Segher Boessenkool wrote:
> >
> > > Since this variable is a local register asm, on entry to the asm the
> > > compiler guara
On Wed, Sep 30, 2020 at 12:14:03PM -0700, Nick Desaulniers wrote:
> On Wed, Sep 30, 2020 at 10:13 AM Peter Zijlstra wrote:
> >
> > On Wed, Sep 30, 2020 at 11:10:36AM -0500, Segher Boessenkool wrote:
> >
> > > Since this variable is a local register asm, on entry to the asm the
> > > compiler guara
On Wed, Sep 30, 2020 at 10:13 AM Peter Zijlstra wrote:
>
> On Wed, Sep 30, 2020 at 11:10:36AM -0500, Segher Boessenkool wrote:
>
> > Since this variable is a local register asm, on entry to the asm the
> > compiler guarantees that the value lives in the assigned register (the
> > "r8" hardware reg
On Wed, Sep 30, 2020 at 11:10:36AM -0500, Segher Boessenkool wrote:
> Since this variable is a local register asm, on entry to the asm the
> compiler guarantees that the value lives in the assigned register (the
> "r8" hardware register in this case). This all works completely fine.
> This is the
Hi!
On Wed, Sep 30, 2020 at 01:16:12PM +0200, Peter Zijlstra wrote:
> On Sun, Sep 27, 2020 at 08:38:03AM -0700, Dave Hansen wrote:
> > On 9/27/20 3:51 AM, Greg Kroah-Hartman wrote:
> > >> +static inline long acrn_hypercall0(unsigned long hcall_id)
> > >> +{
> > >> +register long r8 asm("r8
On Sun, Sep 27, 2020 at 08:38:03AM -0700, Dave Hansen wrote:
> On 9/27/20 3:51 AM, Greg Kroah-Hartman wrote:
> >> +static inline long acrn_hypercall0(unsigned long hcall_id)
> >> +{
> >> + register long r8 asm("r8");
> >> + long result;
> >> +
> >> + /* Nothing can come between the r8 assignment
On Tue, Sep 22, 2020 at 07:42:58PM +0800, shuo.a@intel.com wrote:
> From: Shuo Liu
>
> The Service VM communicates with the hypervisor via conventional
> hypercalls. VMCALL instruction is used to make the hypercalls.
>
> ACRN hypercall ABI:
> * Hypercall number is in R8 register.
> * Up
On Sun 27.Sep'20 at 12:53:14 +0200, Greg Kroah-Hartman wrote:
On Sun, Sep 27, 2020 at 12:51:52PM +0200, Greg Kroah-Hartman wrote:
On Tue, Sep 22, 2020 at 07:42:58PM +0800, shuo.a@intel.com wrote:
> From: Shuo Liu
>
> The Service VM communicates with the hypervisor via conventional
> hyperca
On 9/27/20 3:51 AM, Greg Kroah-Hartman wrote:
>> +static inline long acrn_hypercall0(unsigned long hcall_id)
>> +{
>> +register long r8 asm("r8");
>> +long result;
>> +
>> +/* Nothing can come between the r8 assignment and the asm: */
>> +r8 = hcall_id;
>> +asm volatile("vmcall\
On Sun, Sep 27, 2020 at 12:51:52PM +0200, Greg Kroah-Hartman wrote:
> On Tue, Sep 22, 2020 at 07:42:58PM +0800, shuo.a@intel.com wrote:
> > From: Shuo Liu
> >
> > The Service VM communicates with the hypervisor via conventional
> > hypercalls. VMCALL instruction is used to make the hypercalls
On Tue, Sep 22, 2020 at 07:42:58PM +0800, shuo.a@intel.com wrote:
> From: Shuo Liu
>
> The Service VM communicates with the hypervisor via conventional
> hypercalls. VMCALL instruction is used to make the hypercalls.
>
> ACRN hypercall ABI:
> * Hypercall number is in R8 register.
> * Up
From: Shuo Liu
The Service VM communicates with the hypervisor via conventional
hypercalls. VMCALL instruction is used to make the hypercalls.
ACRN hypercall ABI:
* Hypercall number is in R8 register.
* Up to 2 parameters are in RDI and RSI registers.
* Return value is in RAX register.
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