[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [xen staging-4.16] VT-d: split domid map cleanup check into a function
commit fa45f6b5560e738955993fe061a04d64c6f71c14 Author: Jan Beulich <jbeulich@xxxxxxxx> AuthorDate: Thu Jan 6 14:10:05 2022 +0100 Commit: Jan Beulich <jbeulich@xxxxxxxx> CommitDate: Thu Jan 6 14:10:05 2022 +0100 VT-d: split domid map cleanup check into a function This logic will want invoking from elsewhere. No functional change intended. Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx> Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx> Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx> master commit: 9fdc10abe9457e4c9879a266f82372cb08e88ffb master date: 2021-11-24 11:06:20 +0100 --- xen/drivers/passthrough/vtd/iommu.c | 91 +++++++++++++++++++------------------ 1 file changed, 48 insertions(+), 43 deletions(-) diff --git a/xen/drivers/passthrough/vtd/iommu.c b/xen/drivers/passthrough/vtd/iommu.c index f9ce402f22..de11c258ca 100644 --- a/xen/drivers/passthrough/vtd/iommu.c +++ b/xen/drivers/passthrough/vtd/iommu.c @@ -157,6 +157,51 @@ static void cleanup_domid_map(struct domain *domain, struct vtd_iommu *iommu) } } +static bool any_pdev_behind_iommu(const struct domain *d, + const struct pci_dev *exclude, + const struct vtd_iommu *iommu) +{ + const struct pci_dev *pdev; + + for_each_pdev ( d, pdev ) + { + const struct acpi_drhd_unit *drhd; + + if ( pdev == exclude ) + continue; + + drhd = acpi_find_matched_drhd_unit(pdev); + if ( drhd && drhd->iommu == iommu ) + return true; + } + + return false; +} + +/* + * If no other devices under the same iommu owned by this domain, + * clear iommu in iommu_bitmap and clear domain_id in domid_bitmap. + */ +static void check_cleanup_domid_map(struct domain *d, + const struct pci_dev *exclude, + struct vtd_iommu *iommu) +{ + bool found = any_pdev_behind_iommu(d, exclude, iommu); + + /* + * Hidden devices are associated with DomXEN but usable by the hardware + * domain. Hence they need considering here as well. + */ + if ( !found && is_hardware_domain(d) ) + found = any_pdev_behind_iommu(dom_xen, exclude, iommu); + + if ( !found ) + { + clear_bit(iommu->index, &dom_iommu(d)->arch.vtd.iommu_bitmap); + cleanup_domid_map(d, iommu); + } +} + static void sync_cache(const void *addr, unsigned int size) { static unsigned long clflush_size = 0; @@ -1674,27 +1719,6 @@ int domain_context_unmap_one( return rc; } -static bool any_pdev_behind_iommu(const struct domain *d, - const struct pci_dev *exclude, - const struct vtd_iommu *iommu) -{ - const struct pci_dev *pdev; - - for_each_pdev ( d, pdev ) - { - const struct acpi_drhd_unit *drhd; - - if ( pdev == exclude ) - continue; - - drhd = acpi_find_matched_drhd_unit(pdev); - if ( drhd && drhd->iommu == iommu ) - return true; - } - - return false; -} - static int domain_context_unmap(struct domain *domain, u8 devfn, struct pci_dev *pdev) { @@ -1703,7 +1727,6 @@ static int domain_context_unmap(struct domain *domain, u8 devfn, int ret; uint16_t seg = pdev->seg; uint8_t bus = pdev->bus, tmp_bus, tmp_devfn, secbus; - bool found; switch ( pdev->type ) { @@ -1779,28 +1802,10 @@ static int domain_context_unmap(struct domain *domain, u8 devfn, return -EINVAL; } - if ( ret || QUARANTINE_SKIP(domain) || pdev->devfn != devfn ) - return ret; + if ( !ret && !QUARANTINE_SKIP(domain) && pdev->devfn == devfn ) + check_cleanup_domid_map(domain, pdev, iommu); - /* - * If no other devices under the same iommu owned by this domain, - * clear iommu in iommu_bitmap and clear domain_id in domid_bitmap. - */ - found = any_pdev_behind_iommu(domain, pdev, iommu); - /* - * Hidden devices are associated with DomXEN but usable by the hardware - * domain. Hence they need considering here as well. - */ - if ( !found && is_hardware_domain(domain) ) - found = any_pdev_behind_iommu(dom_xen, pdev, iommu); - - if ( !found ) - { - clear_bit(iommu->index, dom_iommu(domain)->arch.vtd.iommu_bitmap); - cleanup_domid_map(domain, iommu); - } - - return 0; + return ret; } static void iommu_clear_root_pgtable(struct domain *d) -- generated by git-patchbot for /home/xen/git/xen.git#staging-4.16
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