linux-kernel - [PATCH v4 18/22] x86/virt/tdx: Configure TDX module with TDMRs and global KeyID

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Message-Id: <3694e51f437049ebf7796c26ddf010e3afb5da4f.1654025431.git.kai.huang@intel.com>
Date:   Wed,  1 Jun 2022 07:39:41 +1200
From:   Kai Huang <kai.huang@...el.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     seanjc@...gle.com, pbonzini@...hat.com, dave.hansen@...el.com,
        len.brown@...el.com, tony.luck@...el.com,
        rafael.j.wysocki@...el.com, reinette.chatre@...el.com,
        dan.j.williams@...el.com, peterz@...radead.org, ak@...ux.intel.com,
        kirill.shutemov@...ux.intel.com,
        sathyanarayanan.kuppuswamy@...ux.intel.com,
        isaku.yamahata@...el.com, kai.huang@...el.com
Subject: [PATCH v4 18/22] x86/virt/tdx: Configure TDX module with TDMRs and global KeyID

After the TDX-usable memory regions are constructed in an array of TDMRs
and the global KeyID is reserved, configure them to the TDX module using
TDH.SYS.CONFIG SEAMCALL.  TDH.SYS.CONFIG can only be called once and can
be done on any logical cpu.

Signed-off-by: Kai Huang <kai.huang@...el.com>
---
 arch/x86/virt/vmx/tdx/tdx.c | 38 +++++++++++++++++++++++++++++++++++++
 arch/x86/virt/vmx/tdx/tdx.h |  2 ++
 2 files changed, 40 insertions(+)

diff --git a/arch/x86/virt/vmx/tdx/tdx.c b/arch/x86/virt/vmx/tdx/tdx.c
index 7e5f685139fe..7d49531e8e0b 100644
--- a/arch/x86/virt/vmx/tdx/tdx.c
+++ b/arch/x86/virt/vmx/tdx/tdx.c
@@ -18,6 +18,7 @@
 #include <linux/sizes.h>
 #include <linux/memblock.h>
 #include <linux/gfp.h>
+#include <linux/slab.h>
 #include <linux/align.h>
 #include <linux/sort.h>
 #include <asm/cpufeatures.h>
@@ -938,6 +939,37 @@ static int construct_tdmrs_memeblock(struct tdmr_info *tdmr_array,
 	return ret;
 }
 
+static int config_tdx_module(struct tdmr_info *tdmr_array, int tdmr_num,
+			     u64 global_keyid)
+{
+	u64 *tdmr_pa_array;
+	int i, array_sz;
+	u64 ret;
+
+	/*
+	 * TDMR_INFO entries are configured to the TDX module via an
+	 * array of the physical address of each TDMR_INFO.  TDX module
+	 * requires the array itself to be 512-byte aligned.  Round up
+	 * the array size to 512-byte aligned so the buffer allocated
+	 * by kzalloc() will meet the alignment requirement.
+	 */
+	array_sz = ALIGN(tdmr_num * sizeof(u64), TDMR_INFO_PA_ARRAY_ALIGNMENT);
+	tdmr_pa_array = kzalloc(array_sz, GFP_KERNEL);
+	if (!tdmr_pa_array)
+		return -ENOMEM;
+
+	for (i = 0; i < tdmr_num; i++)
+		tdmr_pa_array[i] = __pa(tdmr_array_entry(tdmr_array, i));
+
+	ret = seamcall(TDH_SYS_CONFIG, __pa(tdmr_pa_array), tdmr_num,
+				global_keyid, 0, NULL);
+
+	/* Free the array as it is not required any more. */
+	kfree(tdmr_pa_array);
+
+	return ret ? -EFAULT : 0;
+}
+
 /*
  * Detect and initialize the TDX module.
  *
@@ -1005,11 +1037,17 @@ static int init_tdx_module(void)
 	 */
 	tdx_global_keyid = tdx_keyid_start;
 
+	/* Pass the TDMRs and the global KeyID to the TDX module */
+	ret = config_tdx_module(tdmr_array, tdmr_num, tdx_global_keyid);
+	if (ret)
+		goto out_free_pamts;
+
 	/*
 	 * Return -EINVAL until all steps of TDX module initialization
 	 * process are done.
 	 */
 	ret = -EINVAL;
+out_free_pamts:
 	if (ret)
 		tdmrs_free_pamt_all(tdmr_array, tdmr_num);
 	else
diff --git a/arch/x86/virt/vmx/tdx/tdx.h b/arch/x86/virt/vmx/tdx/tdx.h
index 55d6c69ab900..b9bc499b965b 100644
--- a/arch/x86/virt/vmx/tdx/tdx.h
+++ b/arch/x86/virt/vmx/tdx/tdx.h
@@ -53,6 +53,7 @@
 #define TDH_SYS_INIT		33
 #define TDH_SYS_LP_INIT		35
 #define TDH_SYS_LP_SHUTDOWN	44
+#define TDH_SYS_CONFIG		45
 
 struct cmr_info {
 	u64	base;
@@ -120,6 +121,7 @@ struct tdmr_reserved_area {
 } __packed;
 
 #define TDMR_INFO_ALIGNMENT	512
+#define TDMR_INFO_PA_ARRAY_ALIGNMENT	512
 
 struct tdmr_info {
 	u64 base;
-- 
2.35.3