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HV: Enable CR0.WP

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Page fault could be raised if writing to read-only pages. This is
useful for debugging.

Signed-off-by: Zide Chen <zide.chen@intel.com>
This commit is contained in:
Zide Chen 2018-05-08 12:35:57 -07:00 committed by Jack Ren
parent c53a04f56c
commit 6f97a14398
1 changed files with 6 additions and 0 deletions
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6
hypervisor/arch/x86/mmu.c
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@ -485,6 +485,12 @@ uint64_t get_paging_pml4(void)
void enable_paging(uint64_t pml4_base_addr) void enable_paging(uint64_t pml4_base_addr)
{ {
uint64_t tmp64 = 0;
/* Enable Write Protect, inhibiting writing to read-only pages */
CPU_CR_READ(cr0, &tmp64);
CPU_CR_WRITE(cr0, tmp64 | CR0_WP);
CPU_CR_WRITE(cr3, pml4_base_addr); CPU_CR_WRITE(cr3, pml4_base_addr);
} }