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hv: pci: add some pre-assumption and safety check for PCIe ECAM

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Add some pre-assumption and safety check for PCIe ECAM:
1) ACRN only support platforms with PCIe ECAM to access PCIe device CFG space;
2) Must not use ECAM to access PCIe device CFG space before
pci_switch_to_mmio_cfg_ops was called. (In release version, ACRN didn't support
IO port Mechanism. ECAM is the only way to access the PCIe device CFG space).

Tracked-On: #4371
Signed-off-by: Li Fei1 <fei1.li@intel.com>
This commit is contained in:
Li Fei1 2020-03-04 14:36:50 +08:00 committed by wenlingz
parent 667639b591
commit 7c82efb938
2 changed files with 22 additions and 3 deletions
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5
hypervisor/arch/x86/cpu.c
View File

@ -160,7 +160,10 @@ void init_pcpu_pre(bool is_bsp)
}
#endif
/* NOTE: this must call after MMCONFIG is parsed in init_vboot and before APs are INIT. */
/* NOTE: this must call after MMCONFIG is parsed in init_vboot and before APs are INIT.
* We only support platform with MMIO based CFG space access.
* IO port access only support in debug version.
*/
pci_switch_to_mmio_cfg_ops();
} else {
/* Switch this CPU to use the same page tables set-up by the

20
hypervisor/hw/pci.c
View File

@ -129,18 +129,34 @@ void pci_switch_to_mmio_cfg_ops(void)
/*
* @pre bytes == 1U || bytes == 2U || bytes == 4U
* @pre must not be called before pci_switch_to_mmio_cfg_ops in release version.
*/
uint32_t pci_pdev_read_cfg(union pci_bdf bdf, uint32_t offset, uint32_t bytes)
{
return acrn_pci_cfg_ops->pci_read_cfg(bdf, offset, bytes);
uint32_t val = ~0U;
/* The pci_read_cfg would not be empty unless be called before
* pci_switch_to_mmio_cfg_ops in release version.
*/
if (acrn_pci_cfg_ops->pci_read_cfg != NULL) {
val = acrn_pci_cfg_ops->pci_read_cfg(bdf, offset, bytes);
}
return val;
}
/*
* @pre bytes == 1U || bytes == 2U || bytes == 4U
* @pre must not be called before pci_switch_to_mmio_cfg_ops in release version.
*/
void pci_pdev_write_cfg(union pci_bdf bdf, uint32_t offset, uint32_t bytes, uint32_t val)
{
acrn_pci_cfg_ops->pci_write_cfg(bdf, offset, bytes, val);
/* The pci_write_cfg would not be empty unless be called before
* pci_switch_to_mmio_cfg_ops in release version.
*/
if (acrn_pci_cfg_ops->pci_write_cfg != NULL) {
acrn_pci_cfg_ops->pci_write_cfg(bdf, offset, bytes, val);
}
}
bool pdev_need_bar_restore(const struct pci_pdev *pdev)