KVM: arm64: nv: Handle SEAs due to VNCR redirection

System register accesses redirected to the VNCR page can also generate
external aborts just like any other form of memory access. Route to
kvm_handle_guest_sea() for potential APEI handling, falling back to a
vSError if the kernel didn't handle the abort.

Take the opportunity to throw out the useless kvm_ras.h which provided a
helper with a single callsite...

Cc: Jiaqi Yan <jiaqiyan@google.com>
Reviewed-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20250729182342.3281742-1-oliver.upton@linux.dev
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>

Author: oupton

arch/arm64/include/asm/kvm_mmu.h

@@ -180,6 +180,7 @@ void kvm_free_stage2_pgd(struct kvm_s2_mmu *mmu);
 int kvm_phys_addr_ioremap(struct kvm *kvm, phys_addr_t guest_ipa,
 			  phys_addr_t pa, unsigned long size, bool writable);
 
+int kvm_handle_guest_sea(struct kvm_vcpu *vcpu);
 int kvm_handle_guest_abort(struct kvm_vcpu *vcpu);
 
 phys_addr_t kvm_mmu_get_httbr(void);

arch/arm64/include/asm/kvm_ras.h

@@ -4,19 +4,20 @@
  * Author: Christoffer Dall <c.dall@virtualopensystems.com>
  */
 
+#include <linux/acpi.h>
 #include <linux/mman.h>
 #include <linux/kvm_host.h>
 #include <linux/io.h>
 #include <linux/hugetlb.h>
 #include <linux/sched/signal.h>
 #include <trace/events/kvm.h>
+#include <asm/acpi.h>
 #include <asm/pgalloc.h>
 #include <asm/cacheflush.h>
 #include <asm/kvm_arm.h>
 #include <asm/kvm_mmu.h>
 #include <asm/kvm_pgtable.h>
 #include <asm/kvm_pkvm.h>
-#include <asm/kvm_ras.h>
 #include <asm/kvm_asm.h>
 #include <asm/kvm_emulate.h>
 #include <asm/virt.h>
@@ -1811,6 +1812,19 @@ static void handle_access_fault(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa)
 	read_unlock(&vcpu->kvm->mmu_lock);
 }
 
+int kvm_handle_guest_sea(struct kvm_vcpu *vcpu)
+{
+	/*
+	 * Give APEI the opportunity to claim the abort before handling it
+	 * within KVM. apei_claim_sea() expects to be called with IRQs enabled.
+	 */
+	lockdep_assert_irqs_enabled();
+	if (apei_claim_sea(NULL) == 0)
+		return 1;
+
+	return kvm_inject_serror(vcpu);
+}
+
 /**
  * kvm_handle_guest_abort - handles all 2nd stage aborts
  * @vcpu:	the VCPU pointer
@@ -1834,17 +1848,8 @@ int kvm_handle_guest_abort(struct kvm_vcpu *vcpu)
 	gfn_t gfn;
 	int ret, idx;
 
-	/* Synchronous External Abort? */
-	if (kvm_vcpu_abt_issea(vcpu)) {
-		/*
-		 * For RAS the host kernel may handle this abort.
-		 * There is no need to pass the error into the guest.
-		 */
-		if (kvm_handle_guest_sea())
-			return kvm_inject_serror(vcpu);
-
-		return 1;
-	}
+	if (kvm_vcpu_abt_issea(vcpu))
+		return kvm_handle_guest_sea(vcpu);
 
 	esr = kvm_vcpu_get_esr(vcpu);
 

arch/arm64/kvm/mmu.c

@@ -1289,6 +1289,9 @@ int kvm_handle_vncr_abort(struct kvm_vcpu *vcpu)
 
 	WARN_ON_ONCE(!(esr & ESR_ELx_VNCR));
 
+	if (kvm_vcpu_abt_issea(vcpu))
+		return kvm_handle_guest_sea(vcpu);
+
 	if (esr_fsc_is_permission_fault(esr)) {
 		inject_vncr_perm(vcpu);
 	} else if (esr_fsc_is_translation_fault(esr)) {