[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [RFC PATCH v2 10/26] ARM: GICv3: forward pending LPIs to guests
On Thu, 22 Dec 2016, Andre Przywara wrote: > Upon receiving an LPI, we need to find the right VCPU and virtual IRQ > number to get this IRQ injected. > Iterate our two-level LPI table to find this information quickly when > the host takes an LPI. Call the existing injection function to let the > GIC emulation deal with this interrupt. > > Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx> > --- > xen/arch/arm/gic-its.c | 35 +++++++++++++++++++++++++++++++++++ > xen/arch/arm/gic.c | 6 ++++-- > xen/include/asm-arm/irq.h | 8 ++++++++ > 3 files changed, 47 insertions(+), 2 deletions(-) > > diff --git a/xen/arch/arm/gic-its.c b/xen/arch/arm/gic-its.c > index e7ddd90..0d4ca1b 100644 > --- a/xen/arch/arm/gic-its.c > +++ b/xen/arch/arm/gic-its.c > @@ -72,6 +72,41 @@ static union host_lpi *gic_get_host_lpi(uint32_t plpi) > return &lpi_data.host_lpis[plpi / HOST_LPIS_PER_PAGE][plpi % > HOST_LPIS_PER_PAGE]; > } > > +/* Handle incoming LPIs, which are a bit special, because they are > potentially > + * numerous and also only get injected into guests. Treat them specially > here, > + * by just looking up their target vCPU and virtual LPI number and hand it > + * over to the injection function. > + */ > +void do_LPI(unsigned int lpi) > +{ > + struct domain *d; > + union host_lpi *hlpip, hlpi; > + struct vcpu *vcpu; > + > + WRITE_SYSREG32(lpi, ICC_EOIR1_EL1); > + > + hlpip = gic_get_host_lpi(lpi); > + if ( !hlpip ) > + return; > + > + hlpi.data = hlpip->data; Why can't we just reference hlpip directly throughout this function? Is it for atomicity reasons? > + /* We may have mapped more host LPIs than the guest actually asked for. > */ > + if ( !hlpi.virt_lpi ) > + return; > + > + d = get_domain_by_id(hlpi.dom_id); > + if ( !d ) > + return; > + > + if ( hlpi.vcpu_id >= d->max_vcpus ) > + return; > + > + vcpu = d->vcpu[hlpi.vcpu_id]; > + > + vgic_vcpu_inject_irq(vcpu, hlpi.virt_lpi); > +} > + > #define ITS_CMD_QUEUE_SZ SZ_64K > > static int its_send_command(struct host_its *hw_its, void *its_cmd) > diff --git a/xen/arch/arm/gic.c b/xen/arch/arm/gic.c > index 6f25501..7d428dc 100644 > --- a/xen/arch/arm/gic.c > +++ b/xen/arch/arm/gic.c > @@ -700,8 +700,10 @@ void gic_interrupt(struct cpu_user_regs *regs, int > is_fiq) > local_irq_enable(); > do_IRQ(regs, irq, is_fiq); > local_irq_disable(); > - } > - else if (unlikely(irq < 16)) > + } else if ( irq >= 8192 ) > + { > + do_LPI(irq); > + } else if ( unlikely(irq < 16) ) > { > do_sgi(regs, irq); > } > diff --git a/xen/include/asm-arm/irq.h b/xen/include/asm-arm/irq.h > index 8f7a167..ee47de8 100644 > --- a/xen/include/asm-arm/irq.h > +++ b/xen/include/asm-arm/irq.h > @@ -34,6 +34,14 @@ struct irq_desc *__irq_to_desc(int irq); > > void do_IRQ(struct cpu_user_regs *regs, unsigned int irq, int is_fiq); > > +#ifdef CONFIG_HAS_ITS > +void do_LPI(unsigned int irq); > +#else > +static inline void do_LPI(unsigned int irq) > +{ > +} > +#endif > + > #define domain_pirq_to_irq(d, pirq) (pirq) > > bool_t is_assignable_irq(unsigned int irq); > -- > 2.9.0 > _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx https://lists.xen.org/xen-devel
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