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hv: Remove need for init_fallback_iommu_domain and fallback_iommu_domain

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In the presence of SOS, ACRN uses fallback_iommu_domain which is the same
used by SOS, to assign domain to devices during ACRN init. Also it uses
fallback_iommu_domain when DM requests ACRN to remove device from UOS domain.
This patch changes the design of assign/remove_iommu_device to avoid the
concept of fallback_iommu_domain and its setup. This way ACRN can commonly
treat pre-launched VMs bringup w.r.t. IOMMU domain creation.

Tracked-On: #2965
Signed-off-by: Sainath Grandhi <sainath.grandhi@intel.com>
Reviewed-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Sainath Grandhi
2019-04-13 11:57:25 -07:00
committed by ACRN System Integration
parent 948d58fb9c
commit 824caf8ce0
7 changed files with 40 additions and 116 deletions
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42
hypervisor/include/arch/x86/vtd.h
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@@ -541,9 +541,11 @@ struct iommu_domain;
/**
* @brief Assign a device specified by bus & devfun to a iommu domain.
*
* Remove the device from the fallback iommu domain (if present), and add it to the specific domain.
* Remove the device from the from_domain (if non-NULL), and add it to the to_domain (if non-NULL).
* API silently fails to add/remove devices to/from domains that are under "Ignored" DMAR units.
*
* @param[in] domain iommu domain the device is assigned to
* @param[in] from_domain iommu domain from which the device is removed from
* @param[in] to_domain iommu domain to which the device is assgined to
* @param[in] bus the 8-bit bus number of the device
* @param[in] devfun the 8-bit device(5-bit):function(3-bit) of the device
*
@@ -553,24 +555,7 @@ struct iommu_domain;
* @pre domain != NULL
*
*/
int32_t assign_pt_device(struct iommu_domain *domain, uint8_t bus, uint8_t devfun);
/**
* @brief Unassign a device specified by bus & devfun from a iommu domain .
*
* Remove the device from the specific domain, and then add it to the fallback iommu domain (if present).
*
* @param[in] domain iommu domain the device is assigned to
* @param[in] bus the 8-bit bus number of the device
* @param[in] devfun the 8-bit device(5-bit):function(3-bit) of the device
*
* @retval 0 on success.
* @retval 1 fail to unassign the device
*
* @pre domain != NULL
*
*/
int32_t unassign_pt_device(const struct iommu_domain *domain, uint8_t bus, uint8_t devfun);
int32_t move_pt_device(const struct iommu_domain *from_domain, struct iommu_domain *to_domain, uint8_t bus, uint8_t devfun);
/**
* @brief Create a iommu domain for a VM specified by vm_id.
@@ -649,23 +634,6 @@ void resume_iommu(void);
*/
int32_t init_iommu(void);
/**
* @brief Init fallback iommu domain of iommu.
*
* Create fallback iommu domain using the Normal World's EPT table of fallback iommu as address translation table.
* All PCI devices are added to the fallback iommu domain when creating it.
*
* @param[in] iommu_dmn pointer to fallback iommu domain
* @param[in] vm_id ID of the VM for which iommu_domain needs to be created
* @param[in] eptp EPT hieararchy table
*
* @pre iommu shall point to fallback iommu domain
*
* @remark to reduce boot time & memory cost, a config IOMMU_INIT_BUS_LIMIT, which limit the bus number.
*
*/
void init_fallback_iommu_domain(struct iommu_domain *iommu_dmn, uint16_t vm_id, void *eptp);
/**
* @brief check the iommu if support cache snoop.
*