| Message ID | e109a4092d80a825256d26a8e56dbb5a2ae6d04e.1705066642.git.mykyta_poturai@epam.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | Add support for MSI injection on Arm | expand |
On Sun, 14 Jan 2024, Mykyta Poturai wrote: > Add the vgic_its_trigger_msi() function to the vgic interface. This > function allows to inject MSIs from the Hypervisor to the guest. > Which is useful for userspace PCI backend drivers. > > Signed-off-by: Mykyta Poturai <mykyta_poturai@epam.com> > --- > xen/arch/arm/include/asm/vgic.h | 11 +++++++++++ > xen/arch/arm/vgic-v3-its.c | 35 +++++++++++++++++++++++++++++++++ > 2 files changed, 46 insertions(+) > > diff --git a/xen/arch/arm/include/asm/vgic.h b/xen/arch/arm/include/asm/vgic.h > index 922779ce14..4695743848 100644 > --- a/xen/arch/arm/include/asm/vgic.h > +++ b/xen/arch/arm/include/asm/vgic.h > @@ -317,6 +317,17 @@ extern bool vgic_migrate_irq(struct vcpu *old, struct vcpu *new, unsigned int ir > extern void vgic_check_inflight_irqs_pending(struct domain *d, struct vcpu *v, > unsigned int rank, uint32_t r); > > +#ifdef CONFIG_HAS_ITS > +int vgic_its_trigger_msi(struct domain *d, paddr_t doorbell_address, > + u32 devid, u32 eventid); > +#else > +static inline int vgic_its_trigger_msi(struct domain *d, paddr_t doorbell_address, > + u32 devid, u32 eventid) > +{ > + return -EOPNOTSUPP; > +} > +#endif /* CONFIG_HAS_ITS */ > + > #endif /* !CONFIG_NEW_VGIC */ > > /*** Common VGIC functions used by Xen arch code ****/ > diff --git a/xen/arch/arm/vgic-v3-its.c b/xen/arch/arm/vgic-v3-its.c > index 70b5aeb822..683a378f6e 100644 > --- a/xen/arch/arm/vgic-v3-its.c > +++ b/xen/arch/arm/vgic-v3-its.c > @@ -1484,6 +1484,41 @@ static int vgic_v3_its_init_virtual(struct domain *d, paddr_t guest_addr, > return 0; > } > > +int vgic_its_trigger_msi(struct domain *d, paddr_t doorbell_address, > + u32 devid, u32 eventid) > +{ > + struct vcpu *vcpu; > + struct virt_its *pos, *temp; > + struct virt_its *its = NULL; > + uint32_t vlpi; > + bool ret; > + > + list_for_each_entry_safe( pos, temp, &d->arch.vgic.vits_list, vits_list ) > + { > + if ( pos->doorbell_address == doorbell_address ) > + { > + its = pos; > + break; > + } > + } > + > + if ( !its ) > + return -EINVAL; > + > + spin_lock(&its->its_lock); > + ret = read_itte(its, devid, eventid, &vcpu, &vlpi); > + spin_unlock(&its->its_lock); > + if ( !ret ) > + return -1; > + > + if ( vlpi == INVALID_LPI ) > + return -1; We need a better error code, maybe EINVAL or ENOENT ? Other than that, it looks OK > + vgic_vcpu_inject_lpi(its->d, vlpi); > + > + return 0; > +} > + > unsigned int vgic_v3_its_count(const struct domain *d) > { > struct host_its *hw_its; > -- > 2.34.1 >
Hi, On 24/01/2024 01:17, Stefano Stabellini wrote: > On Sun, 14 Jan 2024, Mykyta Poturai wrote: >> Add the vgic_its_trigger_msi() function to the vgic interface. This >> function allows to inject MSIs from the Hypervisor to the guest. >> Which is useful for userspace PCI backend drivers. >> >> Signed-off-by: Mykyta Poturai <mykyta_poturai@epam.com> >> --- >> xen/arch/arm/include/asm/vgic.h | 11 +++++++++++ >> xen/arch/arm/vgic-v3-its.c | 35 +++++++++++++++++++++++++++++++++ >> 2 files changed, 46 insertions(+) >> >> diff --git a/xen/arch/arm/include/asm/vgic.h b/xen/arch/arm/include/asm/vgic.h >> index 922779ce14..4695743848 100644 >> --- a/xen/arch/arm/include/asm/vgic.h >> +++ b/xen/arch/arm/include/asm/vgic.h >> @@ -317,6 +317,17 @@ extern bool vgic_migrate_irq(struct vcpu *old, struct vcpu *new, unsigned int ir >> extern void vgic_check_inflight_irqs_pending(struct domain *d, struct vcpu *v, >> unsigned int rank, uint32_t r); >> >> +#ifdef CONFIG_HAS_ITS >> +int vgic_its_trigger_msi(struct domain *d, paddr_t doorbell_address, >> + u32 devid, u32 eventid); >> +#else >> +static inline int vgic_its_trigger_msi(struct domain *d, paddr_t doorbell_address, >> + u32 devid, u32 eventid) >> +{ >> + return -EOPNOTSUPP; >> +} >> +#endif /* CONFIG_HAS_ITS */ >> + >> #endif /* !CONFIG_NEW_VGIC */ >> >> /*** Common VGIC functions used by Xen arch code ****/ >> diff --git a/xen/arch/arm/vgic-v3-its.c b/xen/arch/arm/vgic-v3-its.c >> index 70b5aeb822..683a378f6e 100644 >> --- a/xen/arch/arm/vgic-v3-its.c >> +++ b/xen/arch/arm/vgic-v3-its.c >> @@ -1484,6 +1484,41 @@ static int vgic_v3_its_init_virtual(struct domain *d, paddr_t guest_addr, >> return 0; >> } >> >> +int vgic_its_trigger_msi(struct domain *d, paddr_t doorbell_address, >> + u32 devid, u32 eventid) >> +{ >> + struct vcpu *vcpu; >> + struct virt_its *pos, *temp; >> + struct virt_its *its = NULL; >> + uint32_t vlpi; >> + bool ret; >> + >> + list_for_each_entry_safe( pos, temp, &d->arch.vgic.vits_list, vits_list ) >> + { >> + if ( pos->doorbell_address == doorbell_address ) >> + { >> + its = pos; >> + break; >> + } >> + } >> + >> + if ( !its ) >> + return -EINVAL; >> + >> + spin_lock(&its->its_lock); >> + ret = read_itte(its, devid, eventid, &vcpu, &vlpi); >> + spin_unlock(&its->its_lock); >> + if ( !ret ) >> + return -1; >> + >> + if ( vlpi == INVALID_LPI ) >> + return -1; > > We need a better error code, maybe EINVAL or ENOENT ? EINVAL tends to be overloaded. I would prefer ENOENT. Cheers,
Hi, On 14/01/2024 10:01, Mykyta Poturai wrote: > Add the vgic_its_trigger_msi() function to the vgic interface. This > function allows to inject MSIs from the Hypervisor to the guest. > Which is useful for userspace PCI backend drivers. > > Signed-off-by: Mykyta Poturai <mykyta_poturai@epam.com> > --- > xen/arch/arm/include/asm/vgic.h | 11 +++++++++++ > xen/arch/arm/vgic-v3-its.c | 35 +++++++++++++++++++++++++++++++++ > 2 files changed, 46 insertions(+) > > diff --git a/xen/arch/arm/include/asm/vgic.h b/xen/arch/arm/include/asm/vgic.h > index 922779ce14..4695743848 100644 > --- a/xen/arch/arm/include/asm/vgic.h > +++ b/xen/arch/arm/include/asm/vgic.h > @@ -317,6 +317,17 @@ extern bool vgic_migrate_irq(struct vcpu *old, struct vcpu *new, unsigned int ir > extern void vgic_check_inflight_irqs_pending(struct domain *d, struct vcpu *v, > unsigned int rank, uint32_t r); > > +#ifdef CONFIG_HAS_ITS > +int vgic_its_trigger_msi(struct domain *d, paddr_t doorbell_address, > + u32 devid, u32 eventid); > +#else > +static inline int vgic_its_trigger_msi(struct domain *d, paddr_t doorbell_address, > + u32 devid, u32 eventid) > +{ > + return -EOPNOTSUPP; > +} > +#endif /* CONFIG_HAS_ITS */ > + > #endif /* !CONFIG_NEW_VGIC */ > > /*** Common VGIC functions used by Xen arch code ****/ > diff --git a/xen/arch/arm/vgic-v3-its.c b/xen/arch/arm/vgic-v3-its.c > index 70b5aeb822..683a378f6e 100644 > --- a/xen/arch/arm/vgic-v3-its.c > +++ b/xen/arch/arm/vgic-v3-its.c > @@ -1484,6 +1484,41 @@ static int vgic_v3_its_init_virtual(struct domain *d, paddr_t guest_addr, > return 0; > } > > +int vgic_its_trigger_msi(struct domain *d, paddr_t doorbell_address, > + u32 devid, u32 eventid) > +{ > + struct vcpu *vcpu; > + struct virt_its *pos, *temp; > + struct virt_its *its = NULL; > + uint32_t vlpi; > + bool ret; > + > + list_for_each_entry_safe( pos, temp, &d->arch.vgic.vits_list, vits_list ) > + { > + if ( pos->doorbell_address == doorbell_address ) > + { > + its = pos; > + break; > + } > + } > + > + if ( !its ) > + return -EINVAL; > + > + spin_lock(&its->its_lock); > + ret = read_itte(its, devid, eventid, &vcpu, &vlpi); > + spin_unlock(&its->its_lock); > + if ( !ret ) > + return -1; > + > + if ( vlpi == INVALID_LPI ) > + return -1; Reading the code, I think you want to use get_event_pending_irq(). This will return the associated pending_irq. Then you can... > + > + vgic_vcpu_inject_lpi(its->d, vlpi); ... open-code vgic_vcpu_inject_lpi(). This would avoid access the guest memory (done by read_itte) and reduce to just one lookup (today you are doing two: read_itte() and irq_to_pending()). Cheers,
diff --git a/xen/arch/arm/include/asm/vgic.h b/xen/arch/arm/include/asm/vgic.h index 922779ce14..4695743848 100644 --- a/xen/arch/arm/include/asm/vgic.h +++ b/xen/arch/arm/include/asm/vgic.h @@ -317,6 +317,17 @@ extern bool vgic_migrate_irq(struct vcpu *old, struct vcpu *new, unsigned int ir extern void vgic_check_inflight_irqs_pending(struct domain *d, struct vcpu *v, unsigned int rank, uint32_t r); +#ifdef CONFIG_HAS_ITS +int vgic_its_trigger_msi(struct domain *d, paddr_t doorbell_address, + u32 devid, u32 eventid); +#else +static inline int vgic_its_trigger_msi(struct domain *d, paddr_t doorbell_address, + u32 devid, u32 eventid) +{ + return -EOPNOTSUPP; +} +#endif /* CONFIG_HAS_ITS */ + #endif /* !CONFIG_NEW_VGIC */ /*** Common VGIC functions used by Xen arch code ****/ diff --git a/xen/arch/arm/vgic-v3-its.c b/xen/arch/arm/vgic-v3-its.c index 70b5aeb822..683a378f6e 100644 --- a/xen/arch/arm/vgic-v3-its.c +++ b/xen/arch/arm/vgic-v3-its.c @@ -1484,6 +1484,41 @@ static int vgic_v3_its_init_virtual(struct domain *d, paddr_t guest_addr, return 0; } +int vgic_its_trigger_msi(struct domain *d, paddr_t doorbell_address, + u32 devid, u32 eventid) +{ + struct vcpu *vcpu; + struct virt_its *pos, *temp; + struct virt_its *its = NULL; + uint32_t vlpi; + bool ret; + + list_for_each_entry_safe( pos, temp, &d->arch.vgic.vits_list, vits_list ) + { + if ( pos->doorbell_address == doorbell_address ) + { + its = pos; + break; + } + } + + if ( !its ) + return -EINVAL; + + spin_lock(&its->its_lock); + ret = read_itte(its, devid, eventid, &vcpu, &vlpi); + spin_unlock(&its->its_lock); + if ( !ret ) + return -1; + + if ( vlpi == INVALID_LPI ) + return -1; + + vgic_vcpu_inject_lpi(its->d, vlpi); + + return 0; +} + unsigned int vgic_v3_its_count(const struct domain *d) { struct host_its *hw_its;
Add the vgic_its_trigger_msi() function to the vgic interface. This function allows to inject MSIs from the Hypervisor to the guest. Which is useful for userspace PCI backend drivers. Signed-off-by: Mykyta Poturai <mykyta_poturai@epam.com> --- xen/arch/arm/include/asm/vgic.h | 11 +++++++++++ xen/arch/arm/vgic-v3-its.c | 35 +++++++++++++++++++++++++++++++++ 2 files changed, 46 insertions(+)