linux-kernel - [PATCH AUTOSEL 4.19 34/87] MIPS: kvm: Use vm_get_page

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Message-Id: <20201223022103.2792705-34-sashal@kernel.org>
Date:   Tue, 22 Dec 2020 21:20:10 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Sasha Levin <sashal@...nel.org>, linux-mips@...r.kernel.org,
        kvm@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 34/87] MIPS: kvm: Use vm_get_page_prot to get protection bits

From: Thomas Bogendoerfer <tsbogend@...ha.franken.de>

[ Upstream commit 411406a8c758d9ad6f908fab3a6cf1d3d89e1d08 ]

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@...ha.franken.de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/mips/kvm/mmu.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/mips/kvm/mmu.c b/arch/mips/kvm/mmu.c
index 098a7afd4d384..5631d6aee1a70 100644
--- a/arch/mips/kvm/mmu.c
+++ b/arch/mips/kvm/mmu.c
@@ -1099,6 +1099,7 @@ 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) {
@@ -1108,7 +1109,8 @@ 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);
-- 
2.27.0