From: Marc Zyngier <maz@kernel.org>
To: linux-arm-kernel@lists.infradead.org,
kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org,
linux-kernel@vger.kernel.org
Cc: will@kernel.org, qperret@google.com, dbrazdil@google.com,
Steven Price <steven.price@arm.com>,
Andrew Jones <drjones@redhat.com>, Fuad Tabba <tabba@google.com>,
Srivatsa Vaddagiri <vatsa@codeaurora.org>,
Shanker R Donthineni <sdonthineni@nvidia.com>,
James Morse <james.morse@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Alexandru Elisei <alexandru.elisei@arm.com>,
kernel-team@android.com
Subject: [PATCH v2 16/16] arm64: Register earlycon fixmap with the MMIO guard
Date: Mon, 4 Oct 2021 18:48:49 +0100 [thread overview]
Message-ID: <20211004174849.2831548-17-maz@kernel.org> (raw)
In-Reply-To: <20211004174849.2831548-1-maz@kernel.org>
On initialising the MMIO guard infrastructure, register the
earlycon mapping if present.
Signed-off-by: Marc Zyngier <maz@kernel.org>
---
arch/arm64/mm/ioremap.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/arch/arm64/mm/ioremap.c b/arch/arm64/mm/ioremap.c
index 62b715ea31e5..0e10b788500c 100644
--- a/arch/arm64/mm/ioremap.c
+++ b/arch/arm64/mm/ioremap.c
@@ -39,6 +39,17 @@ static int __init ioremap_guard_setup(char *str)
}
early_param("ioremap_guard", ioremap_guard_setup);
+static void fixup_fixmap(void)
+{
+ pte_t *ptep = __get_fixmap_pte(FIX_EARLYCON_MEM_BASE);
+
+ if (!ptep)
+ return;
+
+ ioremap_phys_range_hook(__pte_to_phys(*ptep), PAGE_SIZE,
+ __pgprot(pte_val(*ptep) & PTE_ATTRINDX_MASK));
+}
+
void kvm_init_ioremap_services(void)
{
struct arm_smccc_res res;
@@ -62,6 +73,7 @@ void kvm_init_ioremap_services(void)
&res);
if (res.a0 == SMCCC_RET_SUCCESS) {
static_branch_enable(&ioremap_guard_key);
+ fixup_fixmap();
pr_info("Using KVM MMIO guard for ioremap\n");
} else {
pr_warn("KVM MMIO guard registration failed (%ld)\n", res.a0);
--
2.30.2
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next prev parent reply other threads:[~2021-10-04 18:03 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-04 17:48 [PATCH v2 00/16] KVM: arm64: MMIO guard PV services Marc Zyngier
2021-10-04 17:48 ` [PATCH v2 01/16] KVM: arm64: Generalise VM features into a set of flags Marc Zyngier
2021-10-06 10:24 ` Andrew Jones
2021-10-04 17:48 ` [PATCH v2 02/16] KVM: arm64: Check for PTE valitity when checking for executable/cacheable Marc Zyngier
2021-10-06 10:41 ` Andrew Jones
2021-10-04 17:48 ` [PATCH v2 03/16] KVM: arm64: Turn kvm_pgtable_stage2_set_owner into kvm_pgtable_stage2_annotate Marc Zyngier
2021-10-06 11:02 ` Andrew Jones
2021-10-06 11:22 ` Andrew Jones
2021-10-04 17:48 ` [PATCH v2 04/16] KVM: arm64: Add MMIO checking infrastructure Marc Zyngier
2021-10-06 11:37 ` Andrew Jones
2021-10-04 17:48 ` [PATCH v2 05/16] KVM: arm64: Plumb MMIO checking into the fault handling Marc Zyngier
2021-10-04 17:48 ` [PATCH v2 06/16] KVM: arm64: Force a full unmap on vpcu reinit Marc Zyngier
2021-10-07 13:49 ` Andrew Jones
2021-10-04 17:48 ` [PATCH v2 07/16] KVM: arm64: Wire MMIO guard hypercalls Marc Zyngier
2021-10-07 13:53 ` Andrew Jones
2021-10-04 17:48 ` [PATCH v2 08/16] KVM: arm64: Add tracepoint for failed MMIO guard check Marc Zyngier
2021-10-04 17:48 ` [PATCH v2 09/16] KVM: arm64: Advertise a capability for MMIO guard Marc Zyngier
2021-10-07 14:22 ` Andrew Jones
2021-10-04 17:48 ` [PATCH v2 10/16] KVM: arm64: Add some documentation for the MMIO guard feature Marc Zyngier
2021-10-07 14:38 ` Andrew Jones
2021-10-07 14:42 ` Andrew Jones
2021-10-04 17:48 ` [PATCH v2 11/16] firmware/smccc: Call arch-specific hook on discovering KVM services Marc Zyngier
2021-10-04 17:48 ` [PATCH v2 12/16] mm/vmalloc: Add arch-specific callbacks to track io{remap, unmap} physical pages Marc Zyngier
2021-10-04 17:48 ` [PATCH v2 13/16] arm64: Implement ioremap/iounmap hooks calling into KVM's MMIO guard Marc Zyngier
2021-10-07 15:36 ` Andrew Jones
2021-10-04 17:48 ` [PATCH v2 14/16] arm64: Enroll into KVM's MMIO guard if required Marc Zyngier
2021-10-04 17:48 ` [PATCH v2 15/16] arm64: Add a helper to retrieve the PTE of a fixmap Marc Zyngier
2021-10-04 17:48 ` Marc Zyngier [this message]
2021-10-07 15:52 ` [PATCH v2 00/16] KVM: arm64: MMIO guard PV services Andrew Jones
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