linux-kernel - [PATCH v2 02/25] KVM: TDX: Get TDX global information

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Message-ID: <20241030190039.77971-3-rick.p.edgecombe@intel.com>
Date: Wed, 30 Oct 2024 12:00:15 -0700
From: Rick Edgecombe <rick.p.edgecombe@...el.com>
To: pbonzini@...hat.com,
	seanjc@...gle.com
Cc: rick.p.edgecombe@...el.com,
	yan.y.zhao@...el.com,
	isaku.yamahata@...il.com,
	kai.huang@...el.com,
	kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	tony.lindgren@...ux.intel.com,
	xiaoyao.li@...el.com,
	reinette.chatre@...el.com
Subject: [PATCH v2 02/25] KVM: TDX: Get TDX global information

From: Kai Huang <kai.huang@...el.com>

KVM will need to consult some essential TDX global information to create
and run TDX guests.  Get the global information after initializing TDX.

Signed-off-by: Kai Huang <kai.huang@...el.com>
Signed-off-by: Rick Edgecombe <rick.p.edgecombe@...el.com>
---
uAPI breakout v2:
 - New patch
---
 arch/x86/kvm/vmx/tdx.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c
index 8651599822d5..f95a4dbcaf4a 100644
--- a/arch/x86/kvm/vmx/tdx.c
+++ b/arch/x86/kvm/vmx/tdx.c
@@ -12,6 +12,8 @@ module_param_named(tdx, enable_tdx, bool, 0444);
 
 static enum cpuhp_state tdx_cpuhp_state;
 
+static const struct tdx_sys_info *tdx_sysinfo;
+
 static int tdx_online_cpu(unsigned int cpu)
 {
 	unsigned long flags;
@@ -91,11 +93,20 @@ static int __init __tdx_bringup(void)
 	if (r)
 		goto tdx_bringup_err;
 
+	/* Get TDX global information for later use */
+	tdx_sysinfo = tdx_get_sysinfo();
+	if (WARN_ON_ONCE(!tdx_sysinfo)) {
+		r = -EINVAL;
+		goto get_sysinfo_err;
+	}
+
 	/*
 	 * Leave hardware virtualization enabled after TDX is enabled
 	 * successfully.  TDX CPU hotplug depends on this.
 	 */
 	return 0;
+get_sysinfo_err:
+	__do_tdx_cleanup();
 tdx_bringup_err:
 	kvm_disable_virtualization();
 	return r;
-- 
2.47.0