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3d412266bc
Deterministic is important for RTVM. The mitigation for MCE on Page Size Change converts a large page to 4KB pages runtimely during the vmexit triggered by the instruction fetch in the large page. These vmexits increase nondeterminacy, which should be avoided for RTVM. This patch builds 4KB page mapping in EPT for RTVM to avoid these vmexits. Tracked-On: #4101 Signed-off-by: Binbin Wu <binbin.wu@intel.com> Acked-by: Eddie Dong <eddie.dong@intel.com>
85 lines
2.7 KiB
C
85 lines
2.7 KiB
C
/*
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* Copyright (C) 2018 Intel Corporation. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#ifndef PAGE_H
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#define PAGE_H
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#define PAGE_SHIFT 12U
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#define PAGE_SIZE (1U << PAGE_SHIFT)
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#define PAGE_MASK 0xFFFFFFFFFFFFF000UL
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/* size of the low MMIO address space: 2GB */
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#define PLATFORM_LO_MMIO_SIZE 0x80000000UL
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/* size of the high MMIO address space: 1GB */
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#define PLATFORM_HI_MMIO_SIZE 0x40000000UL
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#define PML4_PAGE_NUM(size) 1UL
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#define PDPT_PAGE_NUM(size) (((size) + PML4E_SIZE - 1UL) >> PML4E_SHIFT)
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#define PD_PAGE_NUM(size) (((size) + PDPTE_SIZE - 1UL) >> PDPTE_SHIFT)
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#define PT_PAGE_NUM(size) (((size) + PDE_SIZE - 1UL) >> PDE_SHIFT)
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/*
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* The size of the guest physical address space, covered by the EPT page table of a VM.
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* With the assumptions:
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* - The GPA of DRAM & MMIO are contiguous.
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* - Guest OS won't re-program device MMIO bars to the address not covered by
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* this EPT_ADDRESS_SPACE.
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*/
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#define EPT_ADDRESS_SPACE(size) (((size) != 0UL) ? ((size) + PLATFORM_LO_MMIO_SIZE + PLATFORM_HI_MMIO_SIZE) : 0UL)
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#define TRUSTY_PML4_PAGE_NUM(size) (1UL)
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#define TRUSTY_PDPT_PAGE_NUM(size) (1UL)
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#define TRUSTY_PD_PAGE_NUM(size) (PD_PAGE_NUM(size))
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#define TRUSTY_PT_PAGE_NUM(size) (PT_PAGE_NUM(size))
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#define TRUSTY_PGTABLE_PAGE_NUM(size) \
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(TRUSTY_PML4_PAGE_NUM(size) + TRUSTY_PDPT_PAGE_NUM(size) + TRUSTY_PD_PAGE_NUM(size) + TRUSTY_PT_PAGE_NUM(size))
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struct acrn_vm;
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struct page {
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uint8_t contents[PAGE_SIZE];
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} __aligned(PAGE_SIZE);
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union pgtable_pages_info {
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struct {
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struct page *pml4_base;
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struct page *pdpt_base;
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struct page *pd_base;
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struct page *pt_base;
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} ppt;
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struct {
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uint64_t top_address_space;
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struct page *nworld_pml4_base;
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struct page *nworld_pdpt_base;
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struct page *nworld_pd_base;
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struct page *nworld_pt_base;
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struct page *sworld_pgtable_base;
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struct page *sworld_memory_base;
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} ept;
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};
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struct memory_ops {
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union pgtable_pages_info *info;
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bool large_page_enabled;
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uint64_t (*get_default_access_right)(void);
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uint64_t (*pgentry_present)(uint64_t pte);
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struct page *(*get_pml4_page)(const union pgtable_pages_info *info);
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struct page *(*get_pdpt_page)(const union pgtable_pages_info *info, uint64_t gpa);
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struct page *(*get_pd_page)(const union pgtable_pages_info *info, uint64_t gpa);
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struct page *(*get_pt_page)(const union pgtable_pages_info *info, uint64_t gpa);
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void *(*get_sworld_memory_base)(const union pgtable_pages_info *info);
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void (*clflush_pagewalk)(const void *p);
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void (*tweak_exe_right)(uint64_t *entry);
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void (*recover_exe_right)(uint64_t *entry);
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};
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extern const struct memory_ops ppt_mem_ops;
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void init_ept_mem_ops(struct memory_ops *mem_ops, uint16_t vm_id);
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void *get_reserve_sworld_memory_base(void);
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#endif /* PAGE_H */
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