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hv: mmu: fix a minor bug 

We should only map [low32_max_ram, 4G) MMIO region as UC attribute,
not map [low32_max_ram, low32_max_ram + 4G) region as UC attribute.
Otherwise, the HV will complain [4G, low32_max_ram + 4G) region has
already mapped.

Tracked-On: #5830
Signed-off-by: Li Fei1 <fei1.li@intel.com>
This commit is contained in:
Li Fei1 2021-04-27 13:41:50 +08:00 committed by wenlingz
parent 9e838248c3
commit f3327364c3
1 changed files with 2 additions and 2 deletions
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4
hypervisor/arch/x86/mmu.c
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@ -307,8 +307,8 @@ void init_paging(void)
high64_max_ram - MEM_4G, PAGE_ATTR_USER | PAGE_CACHE_WB, &ppt_pgtable);
/* Map [low32_max_ram, 4G) and [HI_MMIO_START, HI_MMIO_END) MMIO regions as UC attribute */
pgtable_add_map((uint64_t *)ppt_mmu_pml4_addr, low32_max_ram, low32_max_ram, MEM_4G,
PAGE_ATTR_USER | PAGE_CACHE_UC, &ppt_pgtable);
pgtable_add_map((uint64_t *)ppt_mmu_pml4_addr, low32_max_ram, low32_max_ram,
MEM_4G - low32_max_ram, PAGE_ATTR_USER | PAGE_CACHE_UC, &ppt_pgtable);
if ((HI_MMIO_START != ~0UL) && (HI_MMIO_END != 0UL)) {
pgtable_add_map((uint64_t *)ppt_mmu_pml4_addr, HI_MMIO_START, HI_MMIO_START,
(HI_MMIO_END - HI_MMIO_START), PAGE_ATTR_USER | PAGE_CACHE_UC, &ppt_pgtable);