[11/18] KVM: arm64: Propagate FGT masks to the nVHE hypervisor

Commit Message

Marc Zyngier Feb. 10, 2025, 6:41 p.m. UTC

The nVHE hypervisor needs to have access to its own view of the FGT
masks, which unfortunately results in a bit of data duplication.

Signed-off-by: Marc Zyngier <[e-mail]>
---
 arch/arm64/include/asm/kvm_host.h | 7 +++++++
 arch/arm64/kvm/arm.c              | 8 ++++++++
 arch/arm64/kvm/hyp/nvhe/switch.c  | 7 +++++++
 3 files changed, 22 insertions(+)

Patch

diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index 4e67d4064f409..7220382aeb9dc 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -583,6 +583,13 @@  extern struct fgt_masks hdfgrtr_masks;
 extern struct fgt_masks hdfgwtr_masks;
 extern struct fgt_masks hafgrtr_masks;
 
+extern struct fgt_masks kvm_nvhe_sym(hfgrtr_masks);
+extern struct fgt_masks kvm_nvhe_sym(hfgwtr_masks);
+extern struct fgt_masks kvm_nvhe_sym(hfgitr_masks);
+extern struct fgt_masks kvm_nvhe_sym(hdfgrtr_masks);
+extern struct fgt_masks kvm_nvhe_sym(hdfgwtr_masks);
+extern struct fgt_masks kvm_nvhe_sym(hafgrtr_masks);
+
 struct kvm_cpu_context {
 	struct user_pt_regs regs;	/* sp = sp_el0 */
 
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index 071a7d75be689..0747ab90fc283 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -2414,6 +2414,14 @@  static void kvm_hyp_init_symbols(void)
 	kvm_nvhe_sym(__icache_flags) = __icache_flags;
 	kvm_nvhe_sym(kvm_arm_vmid_bits) = kvm_arm_vmid_bits;
 
+	/* Propagate the FGT state to the the nVHE side */
+	kvm_nvhe_sym(hfgrtr_masks)  = hfgrtr_masks;
+	kvm_nvhe_sym(hfgwtr_masks)  = hfgwtr_masks;
+	kvm_nvhe_sym(hfgitr_masks)  = hfgitr_masks;
+	kvm_nvhe_sym(hdfgrtr_masks) = hdfgrtr_masks;
+	kvm_nvhe_sym(hdfgwtr_masks) = hdfgwtr_masks;
+	kvm_nvhe_sym(hafgrtr_masks) = hafgrtr_masks;
+
 	/*
 	 * Flush entire BSS since part of its data containing init symbols is read
 	 * while the MMU is off.
diff --git a/arch/arm64/kvm/hyp/nvhe/switch.c b/arch/arm64/kvm/hyp/nvhe/switch.c
index 6c846d033d24a..2add6e4c33f1e 100644
--- a/arch/arm64/kvm/hyp/nvhe/switch.c
+++ b/arch/arm64/kvm/hyp/nvhe/switch.c
@@ -33,6 +33,13 @@  DEFINE_PER_CPU(struct kvm_host_data, kvm_host_data);
 DEFINE_PER_CPU(struct kvm_cpu_context, kvm_hyp_ctxt);
 DEFINE_PER_CPU(unsigned long, kvm_hyp_vector);
 
+struct fgt_masks hfgrtr_masks;
+struct fgt_masks hfgwtr_masks;
+struct fgt_masks hfgitr_masks;
+struct fgt_masks hdfgrtr_masks;
+struct fgt_masks hdfgwtr_masks;
+struct fgt_masks hafgrtr_masks;
+
 extern void kvm_nvhe_prepare_backtrace(unsigned long fp, unsigned long pc);
 
 static void __activate_cptr_traps(struct kvm_vcpu *vcpu)