linux-kernel - [RFC PATCH v2 18/18] DO NOT UPSTREAM: RISC-V: KVM: Workaround kvm_riscv_gstage

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Message-ID: <20250920203851.2205115-38-ajones@ventanamicro.com>
Date: Sat, 20 Sep 2025 15:39:08 -0500
From: Andrew Jones <ajones@...tanamicro.com>
To: iommu@...ts.linux.dev,
	kvm-riscv@...ts.infradead.org,
	kvm@...r.kernel.org,
	linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Cc: jgg@...dia.com,
	zong.li@...ive.com,
	tjeznach@...osinc.com,
	joro@...tes.org,
	will@...nel.org,
	robin.murphy@....com,
	anup@...infault.org,
	atish.patra@...ux.dev,
	tglx@...utronix.de,
	alex.williamson@...hat.com,
	paul.walmsley@...ive.com,
	palmer@...belt.com,
	alex@...ti.fr
Subject: [RFC PATCH v2 18/18] DO NOT UPSTREAM: RISC-V: KVM: Workaround kvm_riscv_gstage_ioremap() bug

Workaround a bug that breaks guest booting with device assignment that
was introduced with commit 9bca8be646e0 ("RISC-V: KVM: Fix pte settings
within kvm_riscv_gstage_ioremap()")
---
 arch/riscv/kvm/mmu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/riscv/kvm/mmu.c b/arch/riscv/kvm/mmu.c
index 525fb5a330c0..994f18b92143 100644
--- a/arch/riscv/kvm/mmu.c
+++ b/arch/riscv/kvm/mmu.c
@@ -56,7 +56,7 @@ int kvm_riscv_mmu_ioremap(struct kvm *kvm, gpa_t gpa, phys_addr_t hpa,
 
 	end = (gpa + size + PAGE_SIZE - 1) & PAGE_MASK;
 	pfn = __phys_to_pfn(hpa);
-	prot = pgprot_noncached(PAGE_WRITE);
+	prot = pgprot_noncached(__pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_READ | _PAGE_WRITE));
 
 	for (addr = gpa; addr < end; addr += PAGE_SIZE) {
 		map.addr = addr;
-- 
2.49.0