This patch adds an API which is used to update the IRTE for posted-interrupt when guest changes MSI/MSI-X information.
Signed-off-by: Feng Wu <feng...@intel.com> --- v3: - Remove "adding PDA_MASK()" when updating 'pda_l' and 'pda_h' for IRTE. - Change the return type of pi_update_irte() to int. - Remove some pointless printk message in pi_update_irte(). - Use structure assignment instead of memcpy() for irte copy. xen/drivers/passthrough/vtd/intremap.c | 98 ++++++++++++++++++++++++++++++++++ xen/drivers/passthrough/vtd/iommu.h | 2 + xen/include/asm-x86/iommu.h | 2 + 3 files changed, 102 insertions(+) diff --git a/xen/drivers/passthrough/vtd/intremap.c b/xen/drivers/passthrough/vtd/intremap.c index b7a42f6..401a9d1 100644 --- a/xen/drivers/passthrough/vtd/intremap.c +++ b/xen/drivers/passthrough/vtd/intremap.c @@ -900,3 +900,101 @@ void iommu_disable_x2apic_IR(void) for_each_drhd_unit ( drhd ) disable_qinval(drhd->iommu); } + +static inline void setup_posted_irte( + struct iremap_entry *new_ire, struct pi_desc *pi_desc, uint8_t gvec) +{ + new_ire->post.urg = 0; + new_ire->post.vector = gvec; + new_ire->post.pda_l = virt_to_maddr(pi_desc) >> (32 - PDA_LOW_BIT); + new_ire->post.pda_h = virt_to_maddr(pi_desc) >> 32; + + new_ire->post.res_1 = 0; + new_ire->post.res_2 = 0; + new_ire->post.res_3 = 0; + new_ire->post.res_4 = 0; + new_ire->post.res_5 = 0; + + new_ire->post.im = 1; +} + +/* + * This function is used to update the IRTE for posted-interrupt + * when guest changes MSI/MSI-X information. + */ +int pi_update_irte(struct vcpu *v, struct pirq *pirq, uint8_t gvec) +{ + struct irq_desc *desc; + struct msi_desc *msi_desc; + int remap_index; + int rc = 0; + struct pci_dev *pci_dev; + struct acpi_drhd_unit *drhd; + struct iommu *iommu; + struct ir_ctrl *ir_ctrl; + struct iremap_entry *iremap_entries = NULL, *p = NULL; + struct iremap_entry new_ire; + struct pi_desc *pi_desc = &v->arch.hvm_vmx.pi_desc; + unsigned long flags; + uint128_t old_ire, ret; + + desc = pirq_spin_lock_irq_desc(pirq, NULL); + if ( !desc ) + return -ENOMEM; + + msi_desc = desc->msi_desc; + if ( !msi_desc ) + { + rc = -EBADSLT; + goto unlock_out; + } + + pci_dev = msi_desc->dev; + if ( !pci_dev ) + { + rc = -ENODEV; + goto unlock_out; + } + + remap_index = msi_desc->remap_index; + drhd = acpi_find_matched_drhd_unit(pci_dev); + if ( !drhd ) + { + rc = -ENODEV; + goto unlock_out; + } + + iommu = drhd->iommu; + ir_ctrl = iommu_ir_ctrl(iommu); + if ( !ir_ctrl ) + { + rc = -ENODEV; + goto unlock_out; + } + + spin_lock_irqsave(&ir_ctrl->iremap_lock, flags); + + GET_IREMAP_ENTRY(ir_ctrl->iremap_maddr, remap_index, iremap_entries, p); + new_ire = *p; + + /* Setup/Update interrupt remapping table entry. */ + setup_posted_irte(&new_ire, pi_desc, gvec); + + do { + old_ire = *(uint128_t *)p; + ret = cmpxchg16b(p, &old_ire, &new_ire); + } while ( memcmp(&ret, &old_ire, sizeof(old_ire)) ); + + iommu_flush_cache_entry(p, sizeof(struct iremap_entry)); + iommu_flush_iec_index(iommu, 0, remap_index); + + if ( iremap_entries ) + unmap_vtd_domain_page(iremap_entries); + + spin_unlock_irqrestore(&ir_ctrl->iremap_lock, flags); + + unlock_out: + spin_unlock_irq(&desc->lock); + + return rc; +} diff --git a/xen/drivers/passthrough/vtd/iommu.h b/xen/drivers/passthrough/vtd/iommu.h index 49daa70..9ce941e 100644 --- a/xen/drivers/passthrough/vtd/iommu.h +++ b/xen/drivers/passthrough/vtd/iommu.h @@ -329,6 +329,8 @@ struct iremap_entry { }; }; +#define PDA_LOW_BIT 26 + /* Max intr remapping table page order is 8, as max number of IRTEs is 64K */ #define IREMAP_PAGE_ORDER 8 diff --git a/xen/include/asm-x86/iommu.h b/xen/include/asm-x86/iommu.h index e7a65da..2a1523e 100644 --- a/xen/include/asm-x86/iommu.h +++ b/xen/include/asm-x86/iommu.h @@ -32,6 +32,8 @@ int iommu_supports_eim(void); int iommu_enable_x2apic_IR(void); void iommu_disable_x2apic_IR(void); +int pi_update_irte(struct vcpu *v, struct pirq *pirq, uint8_t gvec); + #endif /* !__ARCH_X86_IOMMU_H__ */ /* * Local variables: -- 2.1.0 _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel