| Message ID | 1461045570-6138-2-git-send-email-dirk.behme@de.bosch.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Hello Dirk, On 19/04/16 06:59, Dirk Behme wrote: > In some mailing list discussion > > http://lists.xen.org/archives/html/xen-devel/2016-04/msg00214.html > > some details about the interrupt handling of Xen were given. > Add that so it's not forgotten. For your information, this is described on the wiki [1]. Although, not in the most obvious place. I would prefer to see this kind of documentation on the wiki page under "Porting Xen on a new SOC". > > Signed-off-by: Dirk Behme <dirk.behme@de.bosch.com> > --- > Note: I'd be happy to move this to an other documentation file if > any other file fits better. > > docs/misc/arm/booting.txt | 15 +++++++++++++++ > 1 file changed, 15 insertions(+) > > diff --git a/docs/misc/arm/booting.txt b/docs/misc/arm/booting.txt > index ffc9029..69b7d81 100644 > --- a/docs/misc/arm/booting.txt > +++ b/docs/misc/arm/booting.txt > @@ -27,6 +27,21 @@ On ARM64 Linux it has to be ensured that the Secure Configuration > Register has the HVC instructions enabled at EL1 and above > (SCR_EL3.HCE == 1). > > + > +Interrupt usage > +=============== > + > +All interrupts are taken by Xen. The function do_IRQ in Xen will > +dispatch the IRQ either to a guest or call a Xen specific handler. > + > +Xen handles only a limited number of interrupt: > +* timers > +* UART > +* SMMU > + > +The rest is either routed to guests or blacklisted by Xen. > + > + > [1] linux/Documentation/arm/Booting > Latest version: http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/Documentation/arm/Booting > > Regards, [1] http://wiki.xenproject.org/wiki/Xen_ARM_with_Virtualization_Extensions_whitepaper
Hi Julien, On 20.04.2016 15:26, Julien Grall wrote: > Hello Dirk, > > On 19/04/16 06:59, Dirk Behme wrote: >> In some mailing list discussion >> >> http://lists.xen.org/archives/html/xen-devel/2016-04/msg00214.html >> >> some details about the interrupt handling of Xen were given. >> Add that so it's not forgotten. > > For your information, this is described on the wiki [1]. Although, not > in the most obvious place. > > I would prefer to see this kind of documentation on the wiki page > under "Porting Xen on a new SOC". Anything like http://wiki.xenproject.org/wiki?title=Xen_ARM_with_Virtualization_Extensions_whitepaper&diff=16710&oldid=11342 ? Best regards Dirk >> >> Signed-off-by: Dirk Behme <dirk.behme@de.bosch.com> >> --- >> Note: I'd be happy to move this to an other documentation file if >> any other file fits better. >> >> docs/misc/arm/booting.txt | 15 +++++++++++++++ >> 1 file changed, 15 insertions(+) >> >> diff --git a/docs/misc/arm/booting.txt b/docs/misc/arm/booting.txt >> index ffc9029..69b7d81 100644 >> --- a/docs/misc/arm/booting.txt >> +++ b/docs/misc/arm/booting.txt >> @@ -27,6 +27,21 @@ On ARM64 Linux it has to be ensured that the >> Secure Configuration >> Register has the HVC instructions enabled at EL1 and above >> (SCR_EL3.HCE == 1). >> >> + >> +Interrupt usage >> +=============== >> + >> +All interrupts are taken by Xen. The function do_IRQ in Xen will >> +dispatch the IRQ either to a guest or call a Xen specific handler. >> + >> +Xen handles only a limited number of interrupt: >> +* timers >> +* UART >> +* SMMU >> + >> +The rest is either routed to guests or blacklisted by Xen. >> + >> + >> [1] linux/Documentation/arm/Booting >> Latest version: >> http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/Documentation/arm/Booting >> >> >> > > Regards, > > [1] > http://wiki.xenproject.org/wiki/Xen_ARM_with_Virtualization_Extensions_whitepaper > >
On 25/04/16 09:56, Dirk Behme wrote: > Hi Julien, Hello Dirk, > On 20.04.2016 15:26, Julien Grall wrote: >> On 19/04/16 06:59, Dirk Behme wrote: >>> In some mailing list discussion >>> >>> http://lists.xen.org/archives/html/xen-devel/2016-04/msg00214.html >>> >>> some details about the interrupt handling of Xen were given. >>> Add that so it's not forgotten. >> >> For your information, this is described on the wiki [1]. Although, not >> in the most obvious place. >> >> I would prefer to see this kind of documentation on the wiki page >> under "Porting Xen on a new SOC". > > > Anything like > > http://wiki.xenproject.org/wiki?title=Xen_ARM_with_Virtualization_Extensions_whitepaper&diff=16710&oldid=11342 It sounds good for me. Regards,
diff --git a/docs/misc/arm/booting.txt b/docs/misc/arm/booting.txt index ffc9029..69b7d81 100644 --- a/docs/misc/arm/booting.txt +++ b/docs/misc/arm/booting.txt @@ -27,6 +27,21 @@ On ARM64 Linux it has to be ensured that the Secure Configuration Register has the HVC instructions enabled at EL1 and above (SCR_EL3.HCE == 1). + +Interrupt usage +=============== + +All interrupts are taken by Xen. The function do_IRQ in Xen will +dispatch the IRQ either to a guest or call a Xen specific handler. + +Xen handles only a limited number of interrupt: +* timers +* UART +* SMMU + +The rest is either routed to guests or blacklisted by Xen. + + [1] linux/Documentation/arm/Booting Latest version: http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/Documentation/arm/Booting
In some mailing list discussion http://lists.xen.org/archives/html/xen-devel/2016-04/msg00214.html some details about the interrupt handling of Xen were given. Add that so it's not forgotten. Signed-off-by: Dirk Behme <dirk.behme@de.bosch.com> --- Note: I'd be happy to move this to an other documentation file if any other file fits better. docs/misc/arm/booting.txt | 15 +++++++++++++++ 1 file changed, 15 insertions(+)