From: Hou Wenlong <houwenlong93@linux.alibaba.com>
To: kvm@vger.kernel.org
Cc: Sean Christopherson <seanjc@google.com>,
Marc Zyngier <maz@kernel.org>, James Morse <james.morse@arm.com>,
Alexandru Elisei <alexandru.elisei@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Huacai Chen <chenhuacai@kernel.org>,
Aleksandar Markovic <aleksandar.qemu.devel@gmail.com>,
Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
Paul Mackerras <paulus@ozlabs.org>,
Michael Ellerman <mpe@ellerman.id.au>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Christian Borntraeger <borntraeger@de.ibm.com>,
Janosch Frank <frankja@linux.ibm.com>,
David Hildenbrand <david@redhat.com>,
Cornelia Huck <cohuck@redhat.com>,
Claudio Imbrenda <imbrenda@linux.ibm.com>,
Heiko Carstens <hca@linux.ibm.com>,
Vasily Gorbik <gor@linux.ibm.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
linux-arm-kernel@lists.infradead.org,
kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org,
linux-mips@vger.kernel.org, kvm-ppc@vger.kernel.org,
linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org
Subject: [PATCH v2 1/2] KVM: Refactor kvm_arch_vcpu_fault() to return a struct page pointer
Date: Thu, 12 Aug 2021 04:02:19 +0000 [thread overview]
Message-ID: <1c510b24fc1d7cbae8aa4b69c0799ebd32e65b82.1628739116.git.houwenlong93@linux.alibaba.com> (raw)
In-Reply-To: <YRQcZqCWwVH8bCGc@google.com>
From: Sean Christopherson <seanjc@google.com>
Refactor kvm_arch_vcpu_fault() to return 'struct page *' instead of
'vm_fault_t' to simplify architecture specific implementations that do
more than return SIGBUS. Currently this only applies to s390, but a
future patch will move x86's pio_data handling into x86 where it belongs.
No functional changed intended.
Cc: Hou Wenlong <houwenlong93@linux.alibaba.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Hou Wenlong <houwenlong93@linux.alibaba.com>
---
arch/arm64/kvm/arm.c | 4 ++--
arch/mips/kvm/mips.c | 4 ++--
arch/powerpc/kvm/powerpc.c | 4 ++--
arch/s390/kvm/kvm-s390.c | 12 ++++--------
arch/x86/kvm/x86.c | 4 ++--
include/linux/kvm_host.h | 2 +-
virt/kvm/kvm_main.c | 5 ++++-
7 files changed, 17 insertions(+), 18 deletions(-)
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index e9a2b8f27792..83f4ffe3e4f2 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -161,9 +161,9 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
return ret;
}
-vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
+struct page *kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
{
- return VM_FAULT_SIGBUS;
+ return NULL;
}
diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
index af9dd029a4e1..ae79874e6fd2 100644
--- a/arch/mips/kvm/mips.c
+++ b/arch/mips/kvm/mips.c
@@ -1053,9 +1053,9 @@ int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
return -ENOIOCTLCMD;
}
-vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
+struct page *kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
{
- return VM_FAULT_SIGBUS;
+ return NULL;
}
int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index be33b5321a76..b9c21f9ab784 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -2090,9 +2090,9 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
return r;
}
-vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
+struct page *kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
{
- return VM_FAULT_SIGBUS;
+ return NULL;
}
static int kvm_vm_ioctl_get_pvinfo(struct kvm_ppc_pvinfo *pvinfo)
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 02574d7b3612..e1b69833e228 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -4979,17 +4979,13 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
return r;
}
-vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
+struct page *kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
{
#ifdef CONFIG_KVM_S390_UCONTROL
- if ((vmf->pgoff = KVM_S390_SIE_PAGE_OFFSET)
- && (kvm_is_ucontrol(vcpu->kvm))) {
- vmf->page = virt_to_page(vcpu->arch.sie_block);
- get_page(vmf->page);
- return 0;
- }
+ if (vmf->pgoff = KVM_S390_SIE_PAGE_OFFSET && kvm_is_ucontrol(vcpu->kvm))
+ return virt_to_page(vcpu->arch.sie_block);
#endif
- return VM_FAULT_SIGBUS;
+ return NULL;
}
/* Section: memory related */
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 3cedc7cc132a..1e3bbe5cd33a 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -5347,9 +5347,9 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
return r;
}
-vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
+struct page *kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
{
- return VM_FAULT_SIGBUS;
+ return NULL;
}
static int kvm_vm_ioctl_set_tss_addr(struct kvm *kvm, unsigned long addr)
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 492d183dd7d0..a949de534722 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -995,7 +995,7 @@ long kvm_arch_dev_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg);
long kvm_arch_vcpu_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg);
-vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf);
+struct page *kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf);
int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext);
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 30d322519253..f7d21418971b 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -3448,7 +3448,10 @@ static vm_fault_t kvm_vcpu_fault(struct vm_fault *vmf)
&vcpu->dirty_ring,
vmf->pgoff - KVM_DIRTY_LOG_PAGE_OFFSET);
else
- return kvm_arch_vcpu_fault(vcpu, vmf);
+ page = kvm_arch_vcpu_fault(vcpu, vmf);
+ if (!page)
+ return VM_FAULT_SIGBUS;
+
get_page(page);
vmf->page = page;
return 0;
--
2.31.1
next parent reply other threads:[~2021-08-12 4:02 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <YRQcZqCWwVH8bCGc@google.com>
2021-08-12 4:02 ` Hou Wenlong [this message]
2021-08-12 9:04 ` [PATCH v2 1/2] KVM: Refactor kvm_arch_vcpu_fault() to return a struct page pointer David Hildenbrand
2021-08-12 15:41 ` Paolo Bonzini
2021-08-23 14:12 ` Christian Borntraeger
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