diff options
Diffstat (limited to 'arch/x86/virt')
| -rw-r--r-- | arch/x86/virt/vmx/tdx/tdx.c | 93 | ||||
| -rw-r--r-- | arch/x86/virt/vmx/tdx/tdx.h | 33 |
2 files changed, 123 insertions, 3 deletions
diff --git a/arch/x86/virt/vmx/tdx/tdx.c b/arch/x86/virt/vmx/tdx/tdx.c index e76ad7c2e53b..eeb7bf8c3742 100644 --- a/arch/x86/virt/vmx/tdx/tdx.c +++ b/arch/x86/virt/vmx/tdx/tdx.c @@ -22,6 +22,7 @@ #include <linux/minmax.h> #include <linux/sizes.h> #include <linux/pfn.h> +#include <linux/align.h> #include <asm/msr-index.h> #include <asm/msr.h> #include <asm/cpufeature.h> @@ -34,6 +35,8 @@ static u32 tdx_nr_guest_keyids __ro_after_init; static DEFINE_PER_CPU(bool, tdx_lp_initialized); +static struct tdmr_info_list tdx_tdmr_list; + static enum tdx_module_status_t tdx_module_status; static DEFINE_MUTEX(tdx_module_lock); @@ -313,6 +316,80 @@ static int get_tdx_tdmr_sysinfo(struct tdx_tdmr_sysinfo *tdmr_sysinfo) return 0; } +/* Calculate the actual TDMR size */ +static int tdmr_size_single(u16 max_reserved_per_tdmr) +{ + int tdmr_sz; + + /* + * The actual size of TDMR depends on the maximum + * number of reserved areas. + */ + tdmr_sz = sizeof(struct tdmr_info); + tdmr_sz += sizeof(struct tdmr_reserved_area) * max_reserved_per_tdmr; + + return ALIGN(tdmr_sz, TDMR_INFO_ALIGNMENT); +} + +static int alloc_tdmr_list(struct tdmr_info_list *tdmr_list, + struct tdx_tdmr_sysinfo *tdmr_sysinfo) +{ + size_t tdmr_sz, tdmr_array_sz; + void *tdmr_array; + + tdmr_sz = tdmr_size_single(tdmr_sysinfo->max_reserved_per_tdmr); + tdmr_array_sz = tdmr_sz * tdmr_sysinfo->max_tdmrs; + + /* + * To keep things simple, allocate all TDMRs together. + * The buffer needs to be physically contiguous to make + * sure each TDMR is physically contiguous. + */ + tdmr_array = alloc_pages_exact(tdmr_array_sz, + GFP_KERNEL | __GFP_ZERO); + if (!tdmr_array) + return -ENOMEM; + + tdmr_list->tdmrs = tdmr_array; + + /* + * Keep the size of TDMR to find the target TDMR + * at a given index in the TDMR list. + */ + tdmr_list->tdmr_sz = tdmr_sz; + tdmr_list->max_tdmrs = tdmr_sysinfo->max_tdmrs; + tdmr_list->nr_consumed_tdmrs = 0; + + return 0; +} + +static void free_tdmr_list(struct tdmr_info_list *tdmr_list) +{ + free_pages_exact(tdmr_list->tdmrs, + tdmr_list->max_tdmrs * tdmr_list->tdmr_sz); +} + +/* + * Construct a list of TDMRs on the preallocated space in @tdmr_list + * to cover all TDX memory regions in @tmb_list based on the TDX module + * TDMR global information in @tdmr_sysinfo. + */ +static int construct_tdmrs(struct list_head *tmb_list, + struct tdmr_info_list *tdmr_list, + struct tdx_tdmr_sysinfo *tdmr_sysinfo) +{ + /* + * TODO: + * + * - Fill out TDMRs to cover all TDX memory regions. + * - Allocate and set up PAMTs for each TDMR. + * - Designate reserved areas for each TDMR. + * + * Return -EINVAL until constructing TDMRs is done + */ + return -EINVAL; +} + static int init_tdx_module(void) { struct tdx_tdmr_sysinfo tdmr_sysinfo; @@ -338,11 +415,19 @@ static int init_tdx_module(void) if (ret) goto err_free_tdxmem; + /* Allocate enough space for constructing TDMRs */ + ret = alloc_tdmr_list(&tdx_tdmr_list, &tdmr_sysinfo); + if (ret) + goto err_free_tdxmem; + + /* Cover all TDX-usable memory regions in TDMRs */ + ret = construct_tdmrs(&tdx_memlist, &tdx_tdmr_list, &tdmr_sysinfo); + if (ret) + goto err_free_tdmrs; + /* * TODO: * - * - Construct a list of TDMRs to cover all TDX-usable memory - * regions. * - Configure the TDMRs and the global KeyID to the TDX module. * - Configure the global KeyID on all packages. * - Initialize all TDMRs. @@ -351,7 +436,7 @@ static int init_tdx_module(void) */ ret = -EINVAL; if (ret) - goto err_free_tdxmem; + goto err_free_tdmrs; out_put_tdxmem: /* * @tdx_memlist is written here and read at memory hotplug time. @@ -360,6 +445,8 @@ out_put_tdxmem: put_online_mems(); return ret; +err_free_tdmrs: + free_tdmr_list(&tdx_tdmr_list); err_free_tdxmem: free_tdx_memlist(&tdx_memlist); goto out_put_tdxmem; diff --git a/arch/x86/virt/vmx/tdx/tdx.h b/arch/x86/virt/vmx/tdx/tdx.h index 29cdf5ea5544..9b6b5d70804f 100644 --- a/arch/x86/virt/vmx/tdx/tdx.h +++ b/arch/x86/virt/vmx/tdx/tdx.h @@ -47,6 +47,30 @@ #define MD_FIELD_ID_ELE_SIZE_16BIT 1 +struct tdmr_reserved_area { + u64 offset; + u64 size; +} __packed; + +#define TDMR_INFO_ALIGNMENT 512 + +struct tdmr_info { + u64 base; + u64 size; + u64 pamt_1g_base; + u64 pamt_1g_size; + u64 pamt_2m_base; + u64 pamt_2m_size; + u64 pamt_4k_base; + u64 pamt_4k_size; + /* + * The actual number of reserved areas depends on the value of + * field MD_FIELD_ID_MAX_RESERVED_PER_TDMR in the TDX module + * global metadata. + */ + DECLARE_FLEX_ARRAY(struct tdmr_reserved_area, reserved_areas); +} __packed __aligned(TDMR_INFO_ALIGNMENT); + /* * Do not put any hardware-defined TDX structure representations below * this comment! @@ -72,4 +96,13 @@ struct tdx_tdmr_sysinfo { u16 pamt_entry_size[TDX_PS_NR]; }; +struct tdmr_info_list { + void *tdmrs; /* Flexible array to hold 'tdmr_info's */ + int nr_consumed_tdmrs; /* How many 'tdmr_info's are in use */ + + /* Metadata for finding target 'tdmr_info' and freeing @tdmrs */ + int tdmr_sz; /* Size of one 'tdmr_info' */ + int max_tdmrs; /* How many 'tdmr_info's are allocated */ +}; + #endif |