From: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Date: Fri, 13 Nov 2020 11:09:50 +0000 (+0100)
Subject: MIPS: kvm: Use vm_get_page_prot to get protection bits
X-Git-Tag: accepted/tizen/unified/20230118.172025~8266^2~26
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=411406a8c758d9ad6f908fab3a6cf1d3d89e1d08;p=platform%2Fkernel%2Flinux-rpi.git

MIPS: kvm: Use vm_get_page_prot to get protection bits

MIPS protection bits are setup during runtime so using defines like
PAGE_SHARED ignores this runtime changes. Using vm_get_page_prot
to get correct page protection fixes this.

Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
---

diff --git a/arch/mips/kvm/mmu.c b/arch/mips/kvm/mmu.c
index 28c366d..3dabeda 100644
--- a/arch/mips/kvm/mmu.c
+++ b/arch/mips/kvm/mmu.c
@@ -1074,6 +1074,7 @@ int kvm_mips_handle_commpage_tlb_fault(unsigned long badvaddr,
 {
 	kvm_pfn_t pfn;
 	pte_t *ptep;
+	pgprot_t prot;
 
 	ptep = kvm_trap_emul_pte_for_gva(vcpu, badvaddr);
 	if (!ptep) {
@@ -1083,7 +1084,8 @@ int kvm_mips_handle_commpage_tlb_fault(unsigned long badvaddr,
 
 	pfn = PFN_DOWN(virt_to_phys(vcpu->arch.kseg0_commpage));
 	/* Also set valid and dirty, so refill handler doesn't have to */
-	*ptep = pte_mkyoung(pte_mkdirty(pfn_pte(pfn, PAGE_SHARED)));
+	prot = vm_get_page_prot(VM_READ|VM_WRITE|VM_SHARED);
+	*ptep = pte_mkyoung(pte_mkdirty(pfn_pte(pfn, prot)));
 
 	/* Invalidate this entry in the TLB, guest kernel ASID only */
 	kvm_mips_host_tlb_inv(vcpu, badvaddr, false, true);