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hv: page: use dynamic page allocation for pagetable mapping

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For FuSa's case, we remove all dynamic memory allocation use in ACRN HV. Instead,
we use static memory allocation or embedded data structure. For pagetable page,
we prefer to use an index (hva for MMU, gpa for EPT) to get a page from a special
page pool. The special page pool should be big enougn for each possible index.
This is not a big problem when we don't support 64 bits MMIO. Without 64 bits MMIO
support, we could use the index to search addrss not larger than DRAM_SIZE + 4G.

However, if ACRN plan to support 64 bits MMIO in SOS, we could not use the static
memory alocation any more. This is because there's a very huge hole between the
top DRAM address and the bottom 64 bits MMIO address. We could not reserve such
many pages for pagetable mapping as the CPU physical address bits may very large.

This patch will use dynamic page allocation for pagetable mapping. We also need
reserve a big enough page pool at first. For HV MMU, we don't use 4K granularity
page table mapping, we need reserve PML4, PDPT and PD pages according the maximum
physical address space (PPT va and pa are identical mapping); For each VM EPT,
we reserve PML4, PDPT and PD pages according to the maximum physical address space
too, (the EPT address sapce can't beyond the physical address space), and we reserve
PT pages by real use cases of DRAM, low MMIO and high MMIO.

Signed-off-by: Li Fei1 <fei1.li@intel.com>
Tracked-On: #5788
This commit is contained in:
Li Fei1
2021-02-19 14:09:58 +08:00
committed by wenlingz
parent 312702f2ec
commit 04a104e856
14 changed files with 161 additions and 253 deletions
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21
hypervisor/include/arch/x86/guest/ept.h
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@@ -18,18 +18,6 @@ typedef void (*pge_handler)(uint64_t *pgentry, uint64_t size);
#define INVALID_HPA (0x1UL << 52U)
#define INVALID_GPA (0x1UL << 52U)
/* External Interfaces */
/**
* @brief Check whether pagetable pages is reserved enough for the GPA range or not
*
* @param[in] vm the pointer that points to VM data structure
* @param[in] base The specified start guest physical address of guest
* physical memory region
* @param[in] size The size of guest physical memory region
*
* @retval true if pagetable pages is reserved enough for the GPA range, false otherwise.
*/
bool ept_is_mr_valid(const struct acrn_vm *vm, uint64_t base, uint64_t size);
/**
* @brief Check if the GPA range is guest valid GPA or not
*
@@ -173,4 +161,13 @@ void walk_ept_table(struct acrn_vm *vm, pge_handler cb);
*/
int32_t ept_misconfig_vmexit_handler(__unused struct acrn_vcpu *vcpu);
/**
* @brief allocate a page from the VM's EPT pagetable page pool
*
* @param[in] vm the pointer that points to VM data structure
*
* @retval a page pointer if there's available used pages in the VM's EPT
* pagetable page pool, null otherwise.
*/
struct page *alloc_ept_page(struct acrn_vm *vm);
#endif /* EPT_H */