linux-kernel - [PATCH v2 13/24] kvm: arm64: Add offset for hyp VA <-> PA conversion

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Message-Id: <20201116204318.63987-14-dbrazdil@google.com>
Date:   Mon, 16 Nov 2020 20:43:07 +0000
From:   David Brazdil <dbrazdil@...gle.com>
To:     kvmarm@...ts.cs.columbia.edu
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Marc Zyngier <maz@...nel.org>,
        James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Dennis Zhou <dennis@...nel.org>,
        Tejun Heo <tj@...nel.org>, Christoph Lameter <cl@...ux.com>,
        Mark Rutland <mark.rutland@....com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Quentin Perret <qperret@...gle.com>,
        Andrew Scull <ascull@...gle.com>,
        Andrew Walbran <qwandor@...gle.com>, kernel-team@...roid.com,
        David Brazdil <dbrazdil@...gle.com>
Subject: [PATCH v2 13/24] kvm: arm64: Add offset for hyp VA <-> PA conversion

Add a host-initialized constant to KVM nVHE hyp code for converting
between EL2 linear map virtual addresses and physical addresses.
Also add `__hyp_pa` macro that performs the conversion.

Signed-off-by: David Brazdil <dbrazdil@...gle.com>
---
 arch/arm64/kvm/hyp/nvhe/psci-relay.c |  3 +++
 arch/arm64/kvm/va_layout.c           | 30 +++++++++++++++++++++++++---
 2 files changed, 30 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/kvm/hyp/nvhe/psci-relay.c b/arch/arm64/kvm/hyp/nvhe/psci-relay.c
index d75d3f896bfd..1583b63322c4 100644
--- a/arch/arm64/kvm/hyp/nvhe/psci-relay.c
+++ b/arch/arm64/kvm/hyp/nvhe/psci-relay.c
@@ -16,6 +16,9 @@
 /* Config options set by the host. */
 u32 __ro_after_init kvm_host_psci_version = PSCI_VERSION(0, 0);
 u32 __ro_after_init kvm_host_psci_function_id[PSCI_FN_MAX];
+s64 __ro_after_init hyp_physvirt_offset;
+
+#define __hyp_pa(x) ((phys_addr_t)((x)) + hyp_physvirt_offset)
 
 static u64 get_psci_func_id(struct kvm_cpu_context *host_ctxt)
 {
diff --git a/arch/arm64/kvm/va_layout.c b/arch/arm64/kvm/va_layout.c
index e0404bcab019..744a0d998ad3 100644
--- a/arch/arm64/kvm/va_layout.c
+++ b/arch/arm64/kvm/va_layout.c
@@ -22,6 +22,30 @@ static u8 tag_lsb;
 static u64 tag_val;
 static u64 va_mask;
 
+/*
+ * Compute HYP VA by using the same computation as kern_hyp_va().
+ */
+static u64 __early_kern_hyp_va(u64 addr)
+{
+	addr &= va_mask;
+	addr |= tag_val << tag_lsb;
+	return addr;
+}
+
+/*
+ * Store a hyp VA <-> PA offset into a hyp-owned variable.
+ */
+static void init_hyp_physvirt_offset(void)
+{
+	extern s64 kvm_nvhe_sym(hyp_physvirt_offset);
+	u64 kern_va, hyp_va;
+
+	/* Compute the offset from the hyp VA and PA of a random symbol. */
+	kern_va = (u64)kvm_ksym_ref(__hyp_text_start);
+	hyp_va = __early_kern_hyp_va(kern_va);
+	CHOOSE_NVHE_SYM(hyp_physvirt_offset) = (s64)__pa(kern_va) - (s64)hyp_va;
+}
+
 /*
  * We want to generate a hyp VA with the following format (with V ==
  * vabits_actual):
@@ -53,6 +77,8 @@ __init void kvm_compute_layout(void)
 		tag_val |= get_random_long() & GENMASK_ULL(vabits_actual - 2, tag_lsb);
 	}
 	tag_val >>= tag_lsb;
+
+	init_hyp_physvirt_offset();
 }
 
 static u32 compute_instruction(int n, u32 rd, u32 rn)
@@ -150,9 +176,7 @@ void kvm_patch_vector_branch(struct alt_instr *alt,
 	/*
 	 * Compute HYP VA by using the same computation as kern_hyp_va()
 	 */
-	addr = (uintptr_t)kvm_ksym_ref(__kvm_hyp_vector);
-	addr &= va_mask;
-	addr |= tag_val << tag_lsb;
+	addr = __early_kern_hyp_va((u64)kvm_ksym_ref(__kvm_hyp_vector));
 
 	/* Use PC[10:7] to branch to the same vector in KVM */
 	addr |= ((u64)origptr & GENMASK_ULL(10, 7));
-- 
2.29.2.299.gdc1121823c-goog