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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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9
hypervisor/arch/x86/page.c
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@@ -12,6 +12,7 @@
#include <vtd.h>
#include <vm_configurations.h>
#include <security.h>
#include <vm.h>
static struct page ppt_pml4_pages[PML4_PAGE_NUM(CONFIG_PLATFORM_RAM_SIZE + PLATFORM_LO_MMIO_SIZE)];
static struct page ppt_pdpt_pages[PDPT_PAGE_NUM(CONFIG_PLATFORM_RAM_SIZE + PLATFORM_LO_MMIO_SIZE)];
@@ -31,7 +32,7 @@ static inline uint64_t ppt_get_default_access_right(void)
return (PAGE_PRESENT | PAGE_RW | PAGE_USER);
}
static inline void ppt_clflush_pagewalk(const void* etry __attribute__((unused)))
static inline void ppt_clflush_pagewalk(const void* entry __attribute__((unused)))
{
}
@@ -66,6 +67,7 @@ static inline void nop_recover_exe_right(uint64_t *entry __attribute__((unused))
const struct memory_ops ppt_mem_ops = {
.info = &ppt_pages_info,
.large_page_enabled = true,
.get_default_access_right = ppt_get_default_access_right,
.pgentry_present = ppt_pgentry_present,
.get_pml4_page = ppt_get_pml4_page,
@@ -205,11 +207,16 @@ void init_ept_mem_ops(struct memory_ops *mem_ops, uint16_t vm_id)
mem_ops->get_pd_page = ept_get_pd_page;
mem_ops->get_pt_page = ept_get_pt_page;
mem_ops->clflush_pagewalk = ept_clflush_pagewalk;
mem_ops->large_page_enabled = true;
/* Mitigation for issue "Machine Check Error on Page Size Change" */
if (is_ept_force_4k_ipage()) {
mem_ops->tweak_exe_right = ept_tweak_exe_right;
mem_ops->recover_exe_right = ept_recover_exe_right;
/* For RTVM, build 4KB page mapping in EPT */
if (is_rt_vm(get_vm_from_vmid(vm_id))) {
mem_ops->large_page_enabled = false;
}
} else {
mem_ops->tweak_exe_right = nop_tweak_exe_right;
mem_ops->recover_exe_right = nop_recover_exe_right;