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mmu: add mmu invlpg support 

when host mmu got updated, it should invalidate TLB & page-struct cache.

currently, there is no mmu update will be done after any AP start, so the
simplest way(to avoid shootdown) is just do invlpg for BSP.

Signed-off-by: Mingqiang Chi <mingqiang.chi@intel.com>
Signed-off-by: Jason Chen CJ <jason.cj.chen@intel.com>
Acked-by: Tian, Kevin <kevin.tian@intel.com>
Acked-by: Xu, Anthony <anthony.xu@intel.com>
This commit is contained in:
Jason Chen CJ 2018-04-10 20:39:16 +08:00 committed by Jack Ren
parent 2d6c75408e
commit ebba622d78
2 changed files with 61 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
hypervisor/arch/x86/cpu.c
View File

@ -55,7 +55,7 @@ spinlock_t up_count_spinlock = {
};
void *per_cpu_data_base_ptr;
int phy_cpu_num;
int phy_cpu_num = 0;
unsigned long pcpu_sync = 0;
uint32_t up_count = 0;

64
hypervisor/arch/x86/mmu.c
View File

@ -88,6 +88,11 @@ static inline void _invept(uint64_t type, struct invept_desc desc)
ASSERT(error == 0, "invept error");
}
static inline void inv_tlb_one_page(void *addr)
{
asm volatile ("invlpg (%0)" : : "r" (addr) : "memory");
}
static void check_mmu_capability(void)
{
uint64_t val;
@ -271,6 +276,24 @@ static uint32_t map_mem_region(void *vaddr, void *paddr,
/* Check to see if mapping should occur */
if (mapped_size != 0) {
/* Get current table entry */
uint64_t entry = MEM_READ64(table_base + table_offset);
bool prev_entry_present = false;
bool mmu_need_invtlb = false;
switch(check_page_table_present(table_type, entry)) {
case PT_PRESENT:
prev_entry_present = true;
break;
case PT_NOT_PRESENT:
prev_entry_present = false;
break;
case PT_MISCFG_PRESENT:
default:
ASSERT(0, "entry misconfigurated present bits");
return 0;
}
switch (request_type) {
case PAGING_REQUEST_TYPE_MAP:
{
@ -286,18 +309,27 @@ static uint32_t map_mem_region(void *vaddr, void *paddr,
/* Write the table entry to map this memory */
MEM_WRITE64(table_base + table_offset, table_entry);
/* Invalidate TLB and page-structure cache,
* if it is the first mapping no need to invalidate TLB
*/
if ((table_type == PTT_HOST) && prev_entry_present)
mmu_need_invtlb = true;
break;
}
case PAGING_REQUEST_TYPE_UNMAP:
{
/* Get current table entry */
uint64_t entry = MEM_READ64(table_base + table_offset);
if (entry) {
if (prev_entry_present) {
/* Table is present.
* Write the table entry to map this memory
*/
MEM_WRITE64(table_base + table_offset, 0);
/* Unmap, need to invalidate TLB and
* page-structure cache
*/
if (table_type == PTT_HOST)
mmu_need_invtlb = true;
}
break;
}
@ -312,12 +344,36 @@ static uint32_t map_mem_region(void *vaddr, void *paddr,
/* Write the table entry to map this memory */
MEM_WRITE64(table_base + table_offset, table_entry);
/* Modify, need to invalidate TLB and
* page-structure cache
*/
if (table_type == PTT_HOST)
mmu_need_invtlb = true;
break;
}
default:
ASSERT(0, "Bad memory map request type");
return 0;
}
if (mmu_need_invtlb) {
/* currently, all native mmu update is done at BSP,
* the assumption is that after AP start, there
* is no mmu update - so we can avoid shootdown issue
* for MP system.
* For invlpg after AP start, just panic here.
*
* TODO: add shootdown APs operation if MMU will be
* modified after AP start in the future.
*/
if ((phy_cpu_num != 0) &&
(pcpu_active_bitmap &
((1UL << phy_cpu_num) - 1))
!= (1UL << CPU_BOOT_ID)) {
panic("need shootdown for invlpg");
}
inv_tlb_one_page(vaddr);
}
}
/* Return mapped size to caller */