[PATCH v3 15/23] kvm: arm64: Add offset for hyp VA <-> PA conversion

David Brazdil
2020-11-26T16:00:53Z

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@google.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 44a9fb462d24..e7091d89f0fc 100644
--- a/arch/arm64/kvm/hyp/nvhe/psci-relay.c
+++ b/arch/arm64/kvm/hyp/nvhe/psci-relay.c
@@ -18,6 +18,9 @@
/* Config options set by the host. */
u32 __ro_after_init kvm_host_psci_version;
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 4130b72e6891..d8cc51bd60bf 100644
--- a/arch/arm64/kvm/va_layout.c
+++ b/arch/arm64/kvm/va_layout.c
@@ -23,6 +23,30 @@ 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):
@@ -54,6 +78,8 @@ __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)
@@ -146,9 +172,7 @@ 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));
--
2.29.2.454.gaff20da3a2-goog