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Message-ID: <CAAhR5DFMwVsTMkCR-inY=5UFHJTpfx6qyrUbki=8oag5OU8MmA@mail.gmail.com>
Date: Thu, 14 Dec 2023 15:22:52 -0800
From: Sagi Shahar <sagis@...gle.com>
To: isaku.yamahata@...el.com
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
isaku.yamahata@...il.com, Paolo Bonzini <pbonzini@...hat.com>, erdemaktas@...gle.com,
Sean Christopherson <seanjc@...gle.com>, David Matlack <dmatlack@...gle.com>, Kai Huang <kai.huang@...el.com>,
Zhi Wang <zhi.wang.linux@...il.com>, chen.bo@...el.com, hang.yuan@...el.com,
tina.zhang@...el.com
Subject: Re: [PATCH v17 007/116] KVM: TDX: Make TDX VM type supported
On Tue, Nov 7, 2023 at 6:57 AM <isaku.yamahata@...el.com> wrote:
>
> From: Isaku Yamahata <isaku.yamahata@...el.com>
>
> NOTE: This patch is in position of the patch series for developers to be
> able to test codes during the middle of the patch series although this
> patch series doesn't provide functional features until the all the patches
> of this patch series. When merging this patch series, this patch can be
> moved to the end.
>
> As first step TDX VM support, return that TDX VM type supported to device
> model, e.g. qemu. The callback to create guest TD is vm_init callback for
> KVM_CREATE_VM.
>
> Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>
> ---
> arch/x86/kvm/vmx/main.c | 18 ++++++++++++++++--
> arch/x86/kvm/vmx/tdx.c | 6 ++++++
> arch/x86/kvm/vmx/vmx.c | 6 ------
> arch/x86/kvm/vmx/x86_ops.h | 3 ++-
> 4 files changed, 24 insertions(+), 9 deletions(-)
>
> diff --git a/arch/x86/kvm/vmx/main.c b/arch/x86/kvm/vmx/main.c
> index 2b805bb95b9e..73a1c4b64819 100644
> --- a/arch/x86/kvm/vmx/main.c
> +++ b/arch/x86/kvm/vmx/main.c
> @@ -10,6 +10,12 @@
> static bool enable_tdx __ro_after_init;
> module_param_named(tdx, enable_tdx, bool, 0444);
>
> +static bool vt_is_vm_type_supported(unsigned long type)
> +{
> + return __kvm_is_vm_type_supported(type) ||
> + (enable_tdx && tdx_is_vm_type_supported(type));
> +}
> +
> static int vt_hardware_enable(void)
> {
> int ret;
> @@ -37,6 +43,14 @@ static __init int vt_hardware_setup(void)
> return 0;
> }
>
> +static int vt_vm_init(struct kvm *kvm)
> +{
> + if (is_td(kvm))
> + return -EOPNOTSUPP; /* Not ready to create guest TD yet. */
> +
> + return vmx_vm_init(kvm);
> +}
> +
> #define VMX_REQUIRED_APICV_INHIBITS \
> (BIT(APICV_INHIBIT_REASON_DISABLE)| \
> BIT(APICV_INHIBIT_REASON_ABSENT) | \
> @@ -57,9 +71,9 @@ struct kvm_x86_ops vt_x86_ops __initdata = {
> .hardware_disable = vmx_hardware_disable,
> .has_emulated_msr = vmx_has_emulated_msr,
>
> - .is_vm_type_supported = vmx_is_vm_type_supported,
> + .is_vm_type_supported = vt_is_vm_type_supported,
I don't see is_vm_type_supported defined at HEAD.
I could only find it here:
https://lore.kernel.org/lkml/ab9d8654bd98ae24de05788a2ecaa4bea6c0c44b.1689893403.git.isaku.yamahata@intel.com/#r
Is [RFC PATCH v4 00/10] KVM: guest_memfd(), X86: Common base ..." a
dependency for this patch series?
> .vm_size = sizeof(struct kvm_vmx),
> - .vm_init = vmx_vm_init,
> + .vm_init = vt_vm_init,
> .vm_destroy = vmx_vm_destroy,
>
> .vcpu_precreate = vmx_vcpu_precreate,
> diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c
> index 1c9884164566..9d3f593eacb8 100644
> --- a/arch/x86/kvm/vmx/tdx.c
> +++ b/arch/x86/kvm/vmx/tdx.c
> @@ -24,6 +24,12 @@ static int __init tdx_module_setup(void)
> return 0;
> }
>
> +bool tdx_is_vm_type_supported(unsigned long type)
> +{
> + /* enable_tdx check is done by the caller. */
> + return type == KVM_X86_TDX_VM;
> +}
> +
> struct vmx_tdx_enabled {
> cpumask_var_t vmx_enabled;
> atomic_t err;
> diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
> index 34165a3c99fa..83b0b62cab6c 100644
> --- a/arch/x86/kvm/vmx/vmx.c
> +++ b/arch/x86/kvm/vmx/vmx.c
> @@ -7532,12 +7532,6 @@ int vmx_vcpu_create(struct kvm_vcpu *vcpu)
> return err;
> }
>
> -bool vmx_is_vm_type_supported(unsigned long type)
> -{
> - /* TODO: Check if TDX is supported. */
> - return __kvm_is_vm_type_supported(type);
> -}
> -
> #define L1TF_MSG_SMT "L1TF CPU bug present and SMT on, data leak possible. See CVE-2018-3646 and https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/l1tf.html for details.\n"
> #define L1TF_MSG_L1D "L1TF CPU bug present and virtualization mitigation disabled, data leak possible. See CVE-2018-3646 and https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/l1tf.html for details.\n"
>
> diff --git a/arch/x86/kvm/vmx/x86_ops.h b/arch/x86/kvm/vmx/x86_ops.h
> index 86c8ee6954e5..ed9147f7b958 100644
> --- a/arch/x86/kvm/vmx/x86_ops.h
> +++ b/arch/x86/kvm/vmx/x86_ops.h
> @@ -28,7 +28,6 @@ void vmx_hardware_unsetup(void);
> int vmx_check_processor_compat(void);
> int vmx_hardware_enable(void);
> void vmx_hardware_disable(void);
> -bool vmx_is_vm_type_supported(unsigned long type);
> int vmx_vm_init(struct kvm *kvm);
> void vmx_vm_destroy(struct kvm *kvm);
> int vmx_vcpu_precreate(struct kvm *kvm);
> @@ -137,8 +136,10 @@ void vmx_setup_mce(struct kvm_vcpu *vcpu);
>
> #ifdef CONFIG_INTEL_TDX_HOST
> int __init tdx_hardware_setup(struct kvm_x86_ops *x86_ops);
> +bool tdx_is_vm_type_supported(unsigned long type);
> #else
> static inline int tdx_hardware_setup(struct kvm_x86_ops *x86_ops) { return -EOPNOTSUPP; }
> +static inline bool tdx_is_vm_type_supported(unsigned long type) { return false; }
> #endif
>
> #endif /* __KVM_X86_VMX_X86_OPS_H */
> --
> 2.25.1
>
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