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75d090fd16
Hookup TDX-specific code to accept memory. Accepting the memory is done with ACCEPT_PAGE module call on every page in the range. MAP_GPA hypercall is not required as the unaccepted memory is considered private already. Extract the part of tdx_enc_status_changed() that does memory acceptance in a new helper. Move the helper tdx-shared.c. It is going to be used by both main kernel and decompressor. [ bp: Fix the INTEL_TDX_GUEST=y, KVM_GUEST=n build. ] Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Link: https://lore.kernel.org/r/20230606142637.5171-10-kirill.shutemov@linux.intel.com
72 lines
1.5 KiB
C
72 lines
1.5 KiB
C
#include <asm/tdx.h>
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#include <asm/pgtable.h>
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static unsigned long try_accept_one(phys_addr_t start, unsigned long len,
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enum pg_level pg_level)
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{
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unsigned long accept_size = page_level_size(pg_level);
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u64 tdcall_rcx;
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u8 page_size;
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if (!IS_ALIGNED(start, accept_size))
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return 0;
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if (len < accept_size)
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return 0;
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/*
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* Pass the page physical address to the TDX module to accept the
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* pending, private page.
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*
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* Bits 2:0 of RCX encode page size: 0 - 4K, 1 - 2M, 2 - 1G.
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*/
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switch (pg_level) {
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case PG_LEVEL_4K:
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page_size = 0;
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break;
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case PG_LEVEL_2M:
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page_size = 1;
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break;
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case PG_LEVEL_1G:
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page_size = 2;
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break;
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default:
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return 0;
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}
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tdcall_rcx = start | page_size;
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if (__tdx_module_call(TDX_ACCEPT_PAGE, tdcall_rcx, 0, 0, 0, NULL))
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return 0;
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return accept_size;
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}
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bool tdx_accept_memory(phys_addr_t start, phys_addr_t end)
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{
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/*
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* For shared->private conversion, accept the page using
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* TDX_ACCEPT_PAGE TDX module call.
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*/
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while (start < end) {
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unsigned long len = end - start;
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unsigned long accept_size;
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/*
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* Try larger accepts first. It gives chance to VMM to keep
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* 1G/2M Secure EPT entries where possible and speeds up
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* process by cutting number of hypercalls (if successful).
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*/
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accept_size = try_accept_one(start, len, PG_LEVEL_1G);
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if (!accept_size)
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accept_size = try_accept_one(start, len, PG_LEVEL_2M);
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if (!accept_size)
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accept_size = try_accept_one(start, len, PG_LEVEL_4K);
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if (!accept_size)
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return false;
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start += accept_size;
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}
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return true;
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}
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