From: Oliver Upton <oupton@kernel.org>
Date: Mon, 24 Nov 2025 19:01:48 +0000 (-0800)
Subject: KVM: arm64: Call helper for reading descriptors directly
X-Git-Tag: v6.19-rc1~103^2~1^2^2~16
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cdba9da34b145eb2f3c502279a454f9a1a8346c1;p=thirdparty%2Fkernel%2Flinux.git

KVM: arm64: Call helper for reading descriptors directly

Going through a function pointer doesn't serve much purpose when there's
only one implementation.

Reviewed-by: Marc Zyngier <maz@kernel.org>
Tested-by: Marc Zyngier <maz@kernel.org>
Link: https://msgid.link/20251124190158.177318-7-oupton@kernel.org
Signed-off-by: Oliver Upton <oupton@kernel.org>
---

diff --git a/arch/arm64/kvm/nested.c b/arch/arm64/kvm/nested.c
index 08839a320a45b..e4928a6a36724 100644
--- a/arch/arm64/kvm/nested.c
+++ b/arch/arm64/kvm/nested.c
@@ -124,7 +124,6 @@ int kvm_vcpu_init_nested(struct kvm_vcpu *vcpu)
 }
 
 struct s2_walk_info {
-	int	     (*read_desc)(phys_addr_t pa, u64 *desc, void *data);
 	void	     *data;
 	u64	     baddr;
 	unsigned int max_oa_bits;
@@ -199,6 +198,13 @@ static int check_output_size(struct s2_walk_info *wi, phys_addr_t output)
 	return 0;
 }
 
+static int read_guest_s2_desc(phys_addr_t pa, u64 *desc, void *data)
+{
+	struct kvm_vcpu *vcpu = data;
+
+	return kvm_read_guest(vcpu->kvm, pa, desc, sizeof(*desc));
+}
+
 /*
  * This is essentially a C-version of the pseudo code from the ARM ARM
  * AArch64.TranslationTableWalk  function.  I strongly recommend looking at
@@ -257,7 +263,7 @@ static int walk_nested_s2_pgd(phys_addr_t ipa,
 			>> (addr_bottom - 3);
 
 		paddr = base_addr | index;
-		ret = wi->read_desc(paddr, &desc, wi->data);
+		ret = read_guest_s2_desc(paddr, &desc, wi->data);
 		if (ret < 0)
 			return ret;
 
@@ -325,13 +331,6 @@ static int walk_nested_s2_pgd(phys_addr_t ipa,
 	return 0;
 }
 
-static int read_guest_s2_desc(phys_addr_t pa, u64 *desc, void *data)
-{
-	struct kvm_vcpu *vcpu = data;
-
-	return kvm_read_guest(vcpu->kvm, pa, desc, sizeof(*desc));
-}
-
 static void vtcr_to_walk_info(u64 vtcr, struct s2_walk_info *wi)
 {
 	wi->t0sz = vtcr & TCR_EL2_T0SZ_MASK;
@@ -364,7 +363,6 @@ int kvm_walk_nested_s2(struct kvm_vcpu *vcpu, phys_addr_t gipa,
 	if (!vcpu_has_nv(vcpu))
 		return 0;
 
-	wi.read_desc = read_guest_s2_desc;
 	wi.data = vcpu;
 	wi.baddr = vcpu_read_sys_reg(vcpu, VTTBR_EL2);