Re: [PATCH v2 05/12] arm64: Basic Branch Target Identification support

2019-10-18 Thread Dave Martin
On Fri, Oct 18, 2019 at 12:16:03PM +0100, Mark Rutland wrote: > [adding mm folk] > > On Fri, Oct 11, 2019 at 06:20:15PM +0100, Dave Martin wrote: > > On Fri, Oct 11, 2019 at 04:10:29PM +0100, Mark Rutland wrote: > > > On Thu, Oct 10, 2019 at 07:44:33PM +0100, Dave Martin wrote: > > > > +#define ar

Re: [PATCH v2 05/12] arm64: Basic Branch Target Identification support

2019-10-18 Thread Dave Martin
On Fri, Oct 18, 2019 at 12:10:03PM +0100, Mark Rutland wrote: > On Fri, Oct 11, 2019 at 06:20:15PM +0100, Dave Martin wrote: > > On Fri, Oct 11, 2019 at 04:10:29PM +0100, Mark Rutland wrote: > > > On Thu, Oct 10, 2019 at 07:44:33PM +0100, Dave Martin wrote: > > > > +#define arch_calc_vm_prot_bits(p

Re: [PATCH v2 05/12] arm64: Basic Branch Target Identification support

2019-10-18 Thread Dave Martin
On Fri, Oct 18, 2019 at 12:05:52PM +0100, Mark Rutland wrote: > On Fri, Oct 11, 2019 at 05:42:00PM +0100, Dave Martin wrote: > > On Fri, Oct 11, 2019 at 05:01:13PM +0100, Dave Martin wrote: > > > On Fri, Oct 11, 2019 at 04:44:45PM +0100, Dave Martin wrote: > > > > On Fri, Oct 11, 2019 at 04:40:43PM

Re: [PATCH v2 05/12] arm64: Basic Branch Target Identification support

2019-10-18 Thread Mark Rutland
[adding mm folk] On Fri, Oct 11, 2019 at 06:20:15PM +0100, Dave Martin wrote: > On Fri, Oct 11, 2019 at 04:10:29PM +0100, Mark Rutland wrote: > > On Thu, Oct 10, 2019 at 07:44:33PM +0100, Dave Martin wrote: > > > +#define arch_validate_prot(prot, addr) arm64_validate_prot(prot, addr) > > > +static

Re: [PATCH v2 05/12] arm64: Basic Branch Target Identification support

2019-10-18 Thread Mark Rutland
On Fri, Oct 11, 2019 at 06:20:15PM +0100, Dave Martin wrote: > On Fri, Oct 11, 2019 at 04:10:29PM +0100, Mark Rutland wrote: > > On Thu, Oct 10, 2019 at 07:44:33PM +0100, Dave Martin wrote: > > > +#define arch_calc_vm_prot_bits(prot, pkey) arm64_calc_vm_prot_bits(prot) > > > +static inline unsigned

Re: [PATCH v2 05/12] arm64: Basic Branch Target Identification support

2019-10-18 Thread Mark Rutland
On Fri, Oct 11, 2019 at 05:42:00PM +0100, Dave Martin wrote: > On Fri, Oct 11, 2019 at 05:01:13PM +0100, Dave Martin wrote: > > On Fri, Oct 11, 2019 at 04:44:45PM +0100, Dave Martin wrote: > > > On Fri, Oct 11, 2019 at 04:40:43PM +0100, Mark Rutland wrote: > > > > On Fri, Oct 11, 2019 at 04:32:26PM

Re: [PATCH v2 05/12] arm64: Basic Branch Target Identification support

2019-10-11 Thread Dave Martin
On Fri, Oct 11, 2019 at 04:10:29PM +0100, Mark Rutland wrote: > On Thu, Oct 10, 2019 at 07:44:33PM +0100, Dave Martin wrote: > > This patch adds the bare minimum required to expose the ARMv8.5 > > Branch Target Identification feature to userspace. > > > > By itself, this does _not_ automatically e

Re: [PATCH v2 05/12] arm64: Basic Branch Target Identification support

2019-10-11 Thread Dave Martin
On Fri, Oct 11, 2019 at 05:01:13PM +0100, Dave Martin wrote: > On Fri, Oct 11, 2019 at 04:44:45PM +0100, Dave Martin wrote: > > On Fri, Oct 11, 2019 at 04:40:43PM +0100, Mark Rutland wrote: > > > On Fri, Oct 11, 2019 at 04:32:26PM +0100, Dave Martin wrote: > > > > On Fri, Oct 11, 2019 at 11:25:33AM

Re: [PATCH v2 05/12] arm64: Basic Branch Target Identification support

2019-10-11 Thread Dave Martin
On Fri, Oct 11, 2019 at 04:44:45PM +0100, Dave Martin wrote: > On Fri, Oct 11, 2019 at 04:40:43PM +0100, Mark Rutland wrote: > > On Fri, Oct 11, 2019 at 04:32:26PM +0100, Dave Martin wrote: > > > On Fri, Oct 11, 2019 at 11:25:33AM -0400, Richard Henderson wrote: > > > > On 10/11/19 11:10 AM, Mark R

Re: [PATCH v2 05/12] arm64: Basic Branch Target Identification support

2019-10-11 Thread Dave Martin
On Fri, Oct 11, 2019 at 04:40:43PM +0100, Mark Rutland wrote: > On Fri, Oct 11, 2019 at 04:32:26PM +0100, Dave Martin wrote: > > On Fri, Oct 11, 2019 at 11:25:33AM -0400, Richard Henderson wrote: > > > On 10/11/19 11:10 AM, Mark Rutland wrote: > > > > On Thu, Oct 10, 2019 at 07:44:33PM +0100, Dave

Re: [PATCH v2 05/12] arm64: Basic Branch Target Identification support

2019-10-11 Thread Mark Rutland
On Fri, Oct 11, 2019 at 04:32:26PM +0100, Dave Martin wrote: > On Fri, Oct 11, 2019 at 11:25:33AM -0400, Richard Henderson wrote: > > On 10/11/19 11:10 AM, Mark Rutland wrote: > > > On Thu, Oct 10, 2019 at 07:44:33PM +0100, Dave Martin wrote: > > >> @@ -730,6 +730,11 @@ static void setup_return > >

Re: [PATCH v2 05/12] arm64: Basic Branch Target Identification support

2019-10-11 Thread Dave Martin
On Fri, Oct 11, 2019 at 11:25:33AM -0400, Richard Henderson wrote: > On 10/11/19 11:10 AM, Mark Rutland wrote: > > On Thu, Oct 10, 2019 at 07:44:33PM +0100, Dave Martin wrote: > >> @@ -730,6 +730,11 @@ static void setup_return > >>regs->regs[29] = (unsigned long)&user->next_frame->fp; > >>r

Re: [PATCH v2 05/12] arm64: Basic Branch Target Identification support

2019-10-11 Thread Richard Henderson
On 10/11/19 11:10 AM, Mark Rutland wrote: > On Thu, Oct 10, 2019 at 07:44:33PM +0100, Dave Martin wrote: >> @@ -730,6 +730,11 @@ static void setup_return >> regs->regs[29] = (unsigned long)&user->next_frame->fp; >> regs->pc = (unsigned long)ka->sa.sa_handler; >> >> +if (system_suppo

Re: [PATCH v2 05/12] arm64: Basic Branch Target Identification support

2019-10-11 Thread Mark Rutland
On Thu, Oct 10, 2019 at 07:44:33PM +0100, Dave Martin wrote: > This patch adds the bare minimum required to expose the ARMv8.5 > Branch Target Identification feature to userspace. > > By itself, this does _not_ automatically enable BTI for any initial > executable pages mapped by execve(). This w