linux-kernel - [RFC PATCH v3 08/11] KVM: Fix set_mem

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Date:   Wed, 28 Jun 2023 15:43:07 -0700
From:   isaku.yamahata@...el.com
To:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     isaku.yamahata@...el.com, isaku.yamahata@...il.com,
        Paolo Bonzini <pbonzini@...hat.com>, erdemaktas@...gle.com,
        Sean Christopherson <seanjc@...gle.com>,
        Sagi Shahar <sagis@...gle.com>,
        David Matlack <dmatlack@...gle.com>,
        Kai Huang <kai.huang@...el.com>,
        Zhi Wang <zhi.wang.linux@...il.com>, chen.bo@...el.com,
        linux-coco@...ts.linux.dev,
        Chao Peng <chao.p.peng@...ux.intel.com>,
        Ackerley Tng <ackerleytng@...gle.com>,
        Vishal Annapurve <vannapurve@...gle.com>,
        Michael Roth <michael.roth@....com>,
        Yuan Yao <yuan.yao@...ux.intel.com>
Subject: [RFC PATCH v3 08/11] KVM: Fix set_mem_attr ioctl when error case

From: Isaku Yamahata <isaku.yamahata@...el.com>

kvm_vm_ioctl_set_mem_attributes() discarded an error code of xa_err()
unconditionally.  If an error occurred at the beginning, return error.

Fixes: 3779c214835b ("KVM: Introduce per-page memory attributes")
Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>

---
Changes v2 -> v3:
- Newly added
---
 virt/kvm/kvm_main.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 422d49634c56..fdef56f85174 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -2423,6 +2423,7 @@ static int kvm_vm_ioctl_set_mem_attributes(struct kvm *kvm,
 	gfn_t start, end;
 	unsigned long i;
 	void *entry;
+	int err = 0;
 
 	/* flags is currently not used. */
 	if (attrs->flags)
@@ -2447,14 +2448,17 @@ static int kvm_vm_ioctl_set_mem_attributes(struct kvm *kvm,
 	KVM_MMU_UNLOCK(kvm);
 
 	for (i = start; i < end; i++) {
-		if (xa_err(xa_store(&kvm->mem_attr_array, i, entry,
-				    GFP_KERNEL_ACCOUNT)))
+		err = xa_err(xa_store(&kvm->mem_attr_array, i, entry,
+				      GFP_KERNEL_ACCOUNT));
+		if (err)
 			break;
 	}
 
 	KVM_MMU_LOCK(kvm);
-	if (i > start)
+	if (i > start) {
+		err = 0;
 		kvm_mem_attrs_changed(kvm, attrs->attributes, start, i);
+	}
 	kvm_mmu_invalidate_end(kvm);
 	KVM_MMU_UNLOCK(kvm);
 
@@ -2463,7 +2467,7 @@ static int kvm_vm_ioctl_set_mem_attributes(struct kvm *kvm,
 	attrs->address = i << PAGE_SHIFT;
 	attrs->size = (end - i) << PAGE_SHIFT;
 
-	return 0;
+	return err;
 }
 #endif /* CONFIG_KVM_GENERIC_MEMORY_ATTRIBUTES */
 
-- 
2.25.1