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hv: ept: build 4KB page mapping in EPT for RTVM for MCE on PSC

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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>
This commit is contained in:
Binbin Wu
2019-11-18 15:15:16 +08:00
committed by wenlingz
parent 0570993b40
commit 3d412266bc
3 changed files with 13 additions and 3 deletions
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1
hypervisor/include/arch/x86/page.h
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@@ -64,6 +64,7 @@ union pgtable_pages_info {
struct memory_ops {
union pgtable_pages_info *info;
bool large_page_enabled;
uint64_t (*get_default_access_right)(void);
uint64_t (*pgentry_present)(uint64_t pte);
struct page *(*get_pml4_page)(const union pgtable_pages_info *info);