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Message-Id: <20201001112954.6258-2-mlevitsk@redhat.com>
Date: Thu, 1 Oct 2020 14:29:51 +0300
From: Maxim Levitsky <mlevitsk@...hat.com>
To: kvm@...r.kernel.org
Cc: Borislav Petkov <bp@...en8.de>,
x86@...nel.org (maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)),
Wanpeng Li <wanpengli@...cent.com>,
Jim Mattson <jmattson@...gle.com>,
Sean Christopherson <sean.j.christopherson@...el.com>,
Thomas Gleixner <tglx@...utronix.de>,
"H. Peter Anvin" <hpa@...or.com>,
Paolo Bonzini <pbonzini@...hat.com>,
Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
Vitaly Kuznetsov <vkuznets@...hat.com>,
Joerg Roedel <joro@...tes.org>,
Maxim Levitsky <mlevitsk@...hat.com>
Subject: [PATCH v7 1/4] KVM: x86: xen_hvm_config: cleanup return values
Return 1 on errors that are caused by wrong guest behavior
(which will inject #GP to the guest)
And return a negative error value on issues that are
the kernel's fault (e.g -ENOMEM)
Signed-off-by: Maxim Levitsky <mlevitsk@...hat.com>
---
arch/x86/kvm/x86.c | 23 +++++++++--------------
1 file changed, 9 insertions(+), 14 deletions(-)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index c4015a43cc8a7..09a0cad49af51 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2812,24 +2812,19 @@ static int xen_hvm_config(struct kvm_vcpu *vcpu, u64 data)
u32 page_num = data & ~PAGE_MASK;
u64 page_addr = data & PAGE_MASK;
u8 *page;
- int r;
- r = -E2BIG;
if (page_num >= blob_size)
- goto out;
- r = -ENOMEM;
+ return 1;
+
page = memdup_user(blob_addr + (page_num * PAGE_SIZE), PAGE_SIZE);
- if (IS_ERR(page)) {
- r = PTR_ERR(page);
- goto out;
+ if (IS_ERR(page))
+ return PTR_ERR(page);
+
+ if (kvm_vcpu_write_guest(vcpu, page_addr, page, PAGE_SIZE)) {
+ kfree(page);
+ return 1;
}
- if (kvm_vcpu_write_guest(vcpu, page_addr, page, PAGE_SIZE))
- goto out_free;
- r = 0;
-out_free:
- kfree(page);
-out:
- return r;
+ return 0;
}
static inline bool kvm_pv_async_pf_enabled(struct kvm_vcpu *vcpu)
--
2.26.2
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