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([2001:b07:6468:f312:c8dd:75d4:99ab:290a]) by smtp.gmail.com with ESMTPSA id z4sm15796600wrp.46.2021.07.06.07.44.46 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 06 Jul 2021 07:44:48 -0700 (PDT) Subject: Re: [RFC PATCH v2 57/69] KVM: VMX: Move register caching logic to common code 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: <088bc637ef2c0f40f33a3f7c6a8ed0ed844ad111.1625186503.git.isaku.yamahata@intel.com> From: Paolo Bonzini Message-ID: Date: Tue, 6 Jul 2021 16:44:46 +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: <088bc637ef2c0f40f33a3f7c6a8ed0ed844ad111.1625186503.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 00:05, isaku.yamahata@intel.com wrote: > From: Sean Christopherson > > Move the guts of vmx_cache_reg() to vt_cache_reg() in preparation for > reusing the bulk of the code for TDX, which can access guest state for > debug TDs. > > Use kvm_x86_ops.cache_reg() in ept_update_paging_mode_cr0() rather than > trying to expose vt_cache_reg() to vmx.c, even though it means taking a > retpoline. The code runs if and only if EPT is enabled but unrestricted > guest. Only one generation of CPU, Nehalem, supports EPT but not > unrestricted guest, and disabling unrestricted guest without also > disabling EPT is, to put it bluntly, dumb. > > Signed-off-by: Sean Christopherson > Signed-off-by: Isaku Yamahata > --- > arch/x86/kvm/vmx/main.c | 37 +++++++++++++++++++++++++++++++++++- > arch/x86/kvm/vmx/vmx.c | 42 +---------------------------------------- > 2 files changed, 37 insertions(+), 42 deletions(-) > > diff --git a/arch/x86/kvm/vmx/main.c b/arch/x86/kvm/vmx/main.c > index 0d8d2a0a2979..b619615f77de 100644 > --- a/arch/x86/kvm/vmx/main.c > +++ b/arch/x86/kvm/vmx/main.c > @@ -341,7 +341,42 @@ static void vt_sync_dirty_debug_regs(struct kvm_vcpu *vcpu) > > static void vt_cache_reg(struct kvm_vcpu *vcpu, enum kvm_reg reg) > { > - vmx_cache_reg(vcpu, reg); > + unsigned long guest_owned_bits; > + > + kvm_register_mark_available(vcpu, reg); > + > + switch (reg) { > + case VCPU_REGS_RSP: > + vcpu->arch.regs[VCPU_REGS_RSP] = vmcs_readl(GUEST_RSP); > + break; > + case VCPU_REGS_RIP: > + vcpu->arch.regs[VCPU_REGS_RIP] = vmcs_readl(GUEST_RIP); > + break; > + case VCPU_EXREG_PDPTR: > + if (enable_ept) > + ept_save_pdptrs(vcpu); > + break; > + case VCPU_EXREG_CR0: > + guest_owned_bits = vcpu->arch.cr0_guest_owned_bits; > + > + vcpu->arch.cr0 &= ~guest_owned_bits; > + vcpu->arch.cr0 |= vmcs_readl(GUEST_CR0) & guest_owned_bits; > + break; > + case VCPU_EXREG_CR3: > + if (is_unrestricted_guest(vcpu) || > + (enable_ept && is_paging(vcpu))) > + vcpu->arch.cr3 = vmcs_readl(GUEST_CR3); > + break; > + case VCPU_EXREG_CR4: > + guest_owned_bits = vcpu->arch.cr4_guest_owned_bits; > + > + vcpu->arch.cr4 &= ~guest_owned_bits; > + vcpu->arch.cr4 |= vmcs_readl(GUEST_CR4) & guest_owned_bits; > + break; > + default: > + KVM_BUG_ON(1, vcpu->kvm); > + break; > + } > } > > static unsigned long vt_get_rflags(struct kvm_vcpu *vcpu) > diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c > index e315a46d1566..3c3bfc80d2bb 100644 > --- a/arch/x86/kvm/vmx/vmx.c > +++ b/arch/x86/kvm/vmx/vmx.c > @@ -2326,46 +2326,6 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info) > return ret; > } > > -static void vmx_cache_reg(struct kvm_vcpu *vcpu, enum kvm_reg reg) > -{ > - unsigned long guest_owned_bits; > - > - kvm_register_mark_available(vcpu, reg); > - > - switch (reg) { > - case VCPU_REGS_RSP: > - vcpu->arch.regs[VCPU_REGS_RSP] = vmcs_readl(GUEST_RSP); > - break; > - case VCPU_REGS_RIP: > - vcpu->arch.regs[VCPU_REGS_RIP] = vmcs_readl(GUEST_RIP); > - break; > - case VCPU_EXREG_PDPTR: > - if (enable_ept) > - ept_save_pdptrs(vcpu); > - break; > - case VCPU_EXREG_CR0: > - guest_owned_bits = vcpu->arch.cr0_guest_owned_bits; > - > - vcpu->arch.cr0 &= ~guest_owned_bits; > - vcpu->arch.cr0 |= vmcs_readl(GUEST_CR0) & guest_owned_bits; > - break; > - case VCPU_EXREG_CR3: > - if (is_unrestricted_guest(vcpu) || > - (enable_ept && is_paging(vcpu))) > - vcpu->arch.cr3 = vmcs_readl(GUEST_CR3); > - break; > - case VCPU_EXREG_CR4: > - guest_owned_bits = vcpu->arch.cr4_guest_owned_bits; > - > - vcpu->arch.cr4 &= ~guest_owned_bits; > - vcpu->arch.cr4 |= vmcs_readl(GUEST_CR4) & guest_owned_bits; > - break; > - default: > - KVM_BUG_ON(1, vcpu->kvm); > - break; > - } > -} > - > static __init int vmx_disabled_by_bios(void) > { > return !boot_cpu_has(X86_FEATURE_MSR_IA32_FEAT_CTL) || > @@ -3066,7 +3026,7 @@ static void ept_update_paging_mode_cr0(unsigned long *hw_cr0, > struct vcpu_vmx *vmx = to_vmx(vcpu); > > if (!kvm_register_is_available(vcpu, VCPU_EXREG_CR3)) > - vmx_cache_reg(vcpu, VCPU_EXREG_CR3); > + kvm_x86_ops.cache_reg(vcpu, VCPU_EXREG_CR3); > if (!(cr0 & X86_CR0_PG)) { > /* From paging/starting to nonpaging */ > exec_controls_setbit(vmx, CPU_BASED_CR3_LOAD_EXITING | > This shows the problem with #including vmx.c. You should have a .h file for both vmx.h and main.h (e.g. kvm_intel.h), so that here you can just use vt_cache_reg. Paolo