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([2001:b07:6468:f312:c8dd:75d4:99ab:290a]) by smtp.gmail.com with ESMTPSA id q23sm1720075edt.22.2021.07.06.06.57.46 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 06 Jul 2021 06:57:48 -0700 (PDT) Subject: Re: [RFC PATCH v2 23/69] KVM: x86: Hoist kvm_dirty_regs check out of sync_regs() To: isaku.yamahata@intel.com, Thomas Gleixner , Ingo Molnar , Borislav Petkov , "H . Peter Anvin" , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , erdemaktas@google.com, Connor Kuehl , Sean Christopherson , x86@kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: isaku.yamahata@gmail.com, Sean Christopherson References: <889017a8d31cea46472e0c64b234ef5919278ed9.1625186503.git.isaku.yamahata@intel.com> From: Paolo Bonzini Message-ID: <98f9f005-67c5-39ba-0be8-8a752604fdd1@redhat.com> Date: Tue, 6 Jul 2021 15:57:46 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: <889017a8d31cea46472e0c64b234ef5919278ed9.1625186503.git.isaku.yamahata@intel.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 03/07/21 00:04, isaku.yamahata@intel.com wrote: > From: Sean Christopherson > > Move the kvm_dirty_regs vs. KVM_SYNC_X86_VALID_FIELDS check out of > sync_regs() and into its sole caller, kvm_arch_vcpu_ioctl_run(). This > allows a future patch to allow synchronizing select state for protected > VMs. > > Signed-off-by: Sean Christopherson > Signed-off-by: Isaku Yamahata > --- > arch/x86/kvm/x86.c | 6 ++---- > 1 file changed, 2 insertions(+), 4 deletions(-) > > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c > index d7110d48cbc1..271245ffc67c 100644 > --- a/arch/x86/kvm/x86.c > +++ b/arch/x86/kvm/x86.c > @@ -9729,7 +9729,8 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu) > goto out; > } > > - if (kvm_run->kvm_valid_regs & ~KVM_SYNC_X86_VALID_FIELDS) { > + if ((kvm_run->kvm_valid_regs & ~KVM_SYNC_X86_VALID_FIELDS) || > + (kvm_run->kvm_dirty_regs & ~KVM_SYNC_X86_VALID_FIELDS)) { > r = -EINVAL; > goto out; > } > @@ -10264,9 +10265,6 @@ static void store_regs(struct kvm_vcpu *vcpu) > > static int sync_regs(struct kvm_vcpu *vcpu) > { > - if (vcpu->run->kvm_dirty_regs & ~KVM_SYNC_X86_VALID_FIELDS) > - return -EINVAL; > - > if (vcpu->run->kvm_dirty_regs & KVM_SYNC_X86_REGS) { > __set_regs(vcpu, &vcpu->run->s.regs.regs); > vcpu->run->kvm_dirty_regs &= ~KVM_SYNC_X86_REGS; > Reviewed-by: Paolo Bonzini