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Date: Thu, 5 May 2022 11:14:05 -0700
From: isaku.yamahata@...el.com
To: kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: isaku.yamahata@...el.com, isaku.yamahata@...il.com,
Paolo Bonzini <pbonzini@...hat.com>, erdemaktas@...gle.com,
Sean Christopherson <seanjc@...gle.com>,
Sagi Shahar <sagis@...gle.com>
Subject: [RFC PATCH v6 011/104] KVM: TDX: Initialize TDX module when loading kvm_intel.ko
From: Isaku Yamahata <isaku.yamahata@...el.com>
To use TDX functionality, TDX module needs to be loaded and initialized.
A TDX host patch series[1] implements the detection of the TDX module,
tdx_detect() and its initialization, tdx_init().
This patch is to call those functions, tdx_detect() and tdx_init(), when
loading kvm_intel.ko.
Add a hook, kvm_arch_post_hardware_enable_setup, to module initialization
while hardware is enabled, i.e. after hardware_enable_all() and before
hardware_disable_all(). Because TDX requires all present CPUs to enable
VMX (VMXON).
[1] https://lore.kernel.org/lkml/cover.1649219184.git.kai.huang@intel.com/
Suggested-by: Sean Christopherson <seanjc@...gle.com>
Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>
---
arch/x86/include/asm/kvm_host.h | 1 +
arch/x86/kvm/vmx/main.c | 11 ++++++
arch/x86/kvm/vmx/tdx.c | 66 +++++++++++++++++++++++++++++++++
arch/x86/kvm/vmx/tdx.h | 4 ++
arch/x86/kvm/x86.c | 8 ++++
include/linux/kvm_host.h | 1 +
virt/kvm/kvm_main.c | 11 ++++++
7 files changed, 102 insertions(+)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 5bea36d2d5a4..24c15cfe6c32 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1543,6 +1543,7 @@ struct kvm_x86_init_ops {
int (*cpu_has_kvm_support)(void);
int (*disabled_by_bios)(void);
int (*hardware_setup)(void);
+ int (*post_hardware_enable_setup)(void);
unsigned int (*handle_intel_pt_intr)(void);
struct kvm_x86_ops *runtime_ops;
diff --git a/arch/x86/kvm/vmx/main.c b/arch/x86/kvm/vmx/main.c
index 349534412216..ac788af17d92 100644
--- a/arch/x86/kvm/vmx/main.c
+++ b/arch/x86/kvm/vmx/main.c
@@ -23,6 +23,16 @@ static __init int vt_hardware_setup(void)
return 0;
}
+static int __init vt_post_hardware_enable_setup(void)
+{
+ enable_tdx = enable_tdx && !tdx_module_setup();
+ /*
+ * Even if it failed to initialize TDX module, conventional VMX is
+ * available. Keep VMX usable.
+ */
+ return 0;
+}
+
struct kvm_x86_ops vt_x86_ops __initdata = {
.name = "kvm_intel",
@@ -165,6 +175,7 @@ struct kvm_x86_init_ops vt_init_ops __initdata = {
.cpu_has_kvm_support = vmx_cpu_has_kvm_support,
.disabled_by_bios = vmx_disabled_by_bios,
.hardware_setup = vt_hardware_setup,
+ .post_hardware_enable_setup = vt_post_hardware_enable_setup,
.handle_intel_pt_intr = NULL,
.runtime_ops = &vt_x86_ops,
diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c
index 5d2b4e87b9b7..34aac9b5d43e 100644
--- a/arch/x86/kvm/vmx/tdx.c
+++ b/arch/x86/kvm/vmx/tdx.c
@@ -13,6 +13,72 @@
static u64 hkid_mask __ro_after_init;
static u8 hkid_start_pos __ro_after_init;
+#define TDX_MAX_NR_CPUID_CONFIGS \
+ ((sizeof(struct tdsysinfo_struct) - \
+ offsetof(struct tdsysinfo_struct, cpuid_configs)) \
+ / sizeof(struct tdx_cpuid_config))
+
+struct tdx_capabilities {
+ u8 tdcs_nr_pages;
+ u8 tdvpx_nr_pages;
+
+ u64 attrs_fixed0;
+ u64 attrs_fixed1;
+ u64 xfam_fixed0;
+ u64 xfam_fixed1;
+
+ u32 nr_cpuid_configs;
+ struct tdx_cpuid_config cpuid_configs[TDX_MAX_NR_CPUID_CONFIGS];
+};
+
+/* Capabilities of KVM + the TDX module. */
+static struct tdx_capabilities tdx_caps;
+
+int __init tdx_module_setup(void)
+{
+ const struct tdsysinfo_struct *tdsysinfo;
+ int ret = 0;
+
+ BUILD_BUG_ON(sizeof(*tdsysinfo) != 1024);
+ BUILD_BUG_ON(TDX_MAX_NR_CPUID_CONFIGS != 37);
+
+ ret = tdx_detect();
+ if (ret) {
+ pr_info("Failed to detect TDX module.\n");
+ return ret;
+ }
+
+ ret = tdx_init();
+ if (ret) {
+ pr_info("Failed to initialize TDX module.\n");
+ return ret;
+ }
+
+ tdsysinfo = tdx_get_sysinfo();
+ if (tdx_caps.nr_cpuid_configs > TDX_MAX_NR_CPUID_CONFIGS)
+ return -EIO;
+
+ tdx_caps = (struct tdx_capabilities) {
+ .tdcs_nr_pages = tdsysinfo->tdcs_base_size / PAGE_SIZE,
+ /*
+ * TDVPS = TDVPR(4K page) + TDVPX(multiple 4K pages).
+ * -1 for TDVPR.
+ */
+ .tdvpx_nr_pages = tdsysinfo->tdvps_base_size / PAGE_SIZE - 1,
+ .attrs_fixed0 = tdsysinfo->attributes_fixed0,
+ .attrs_fixed1 = tdsysinfo->attributes_fixed1,
+ .xfam_fixed0 = tdsysinfo->xfam_fixed0,
+ .xfam_fixed1 = tdsysinfo->xfam_fixed1,
+ .nr_cpuid_configs = tdsysinfo->num_cpuid_config,
+ };
+ if (!memcpy(tdx_caps.cpuid_configs, tdsysinfo->cpuid_configs,
+ tdsysinfo->num_cpuid_config *
+ sizeof(struct tdx_cpuid_config)))
+ return -EIO;
+
+ return 0;
+}
+
int __init tdx_hardware_setup(struct kvm_x86_ops *x86_ops)
{
u32 max_pa;
diff --git a/arch/x86/kvm/vmx/tdx.h b/arch/x86/kvm/vmx/tdx.h
index 060bf48ec3d6..54d7a26ed9ee 100644
--- a/arch/x86/kvm/vmx/tdx.h
+++ b/arch/x86/kvm/vmx/tdx.h
@@ -3,6 +3,8 @@
#define __KVM_X86_TDX_H
#ifdef CONFIG_INTEL_TDX_HOST
+int tdx_module_setup(void);
+
struct kvm_tdx {
struct kvm kvm;
/* TDX specific members follow. */
@@ -37,6 +39,8 @@ static inline struct vcpu_tdx *to_tdx(struct kvm_vcpu *vcpu)
return container_of(vcpu, struct vcpu_tdx, vcpu);
}
#else
+static inline int tdx_module_setup(void) { return -ENODEV; };
+
struct kvm_tdx {
struct kvm kvm;
};
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 65f725a49e67..bf77a8b64647 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -11725,6 +11725,14 @@ int kvm_arch_hardware_setup(void *opaque)
return 0;
}
+int kvm_arch_post_hardware_enable_setup(void *opaque)
+{
+ struct kvm_x86_init_ops *ops = opaque;
+ if (ops->post_hardware_enable_setup)
+ return ops->post_hardware_enable_setup();
+ return 0;
+}
+
void kvm_arch_hardware_unsetup(void)
{
kvm_unregister_perf_callbacks();
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 1aead3921a16..55dd08cca5d2 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1441,6 +1441,7 @@ void kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu, struct dentry *debugfs_
int kvm_arch_hardware_enable(void);
void kvm_arch_hardware_disable(void);
int kvm_arch_hardware_setup(void *opaque);
+int kvm_arch_post_hardware_enable_setup(void *opaque);
void kvm_arch_hardware_unsetup(void);
int kvm_arch_check_processor_compat(void);
int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu);
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 6b9dbc55af9e..6edce5de54ff 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -5686,6 +5686,11 @@ void kvm_unregister_perf_callbacks(void)
}
#endif
+__weak int kvm_arch_post_hardware_enable_setup(void *opaque)
+{
+ return 0;
+}
+
int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
struct module *module)
{
@@ -5720,6 +5725,12 @@ int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
r = hardware_enable_all();
if (r)
goto out_free_2;
+ /*
+ * Arch specific initialization that requires to enable virtualization
+ * feature. e.g. TDX module initialization requires VMXON on all
+ * present CPUs.
+ */
+ kvm_arch_post_hardware_enable_setup(opaque);
hardware_disable_all();
r = cpuhp_setup_state_nocalls(CPUHP_AP_KVM_STARTING, "kvm/cpu:starting",
--
2.25.1
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