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- Fixup comment typo
- Prevent unexpected #VE's from:
- Hosts removing perfectly good guest mappings (SEPT_VE_DISABLE
- Excessive #VE notifications (NOTIFY_ENABLES) which are
delivered via a #VE.
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Merge tag 'x86_tdx_for_6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull Intel Trust Domain Extensions (TDX) updates from Dave Hansen:
"Other than a minor fixup, the content here is to ensure that TDX
guests never see virtualization exceptions (#VE's) that might be
induced by the untrusted VMM.
This is a highly desirable property. Without it, #VE exception
handling would fall somewhere between NMIs, machine checks and total
insanity. With it, #VE handling remains pretty mundane.
Summary:
- Fixup comment typo
- Prevent unexpected #VE's from:
- Hosts removing perfectly good guest mappings (SEPT_VE_DISABLE)
- Excessive #VE notifications (NOTIFY_ENABLES) which are delivered
via a #VE"
* tag 'x86_tdx_for_6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/tdx: Do not corrupt frame-pointer in __tdx_hypercall()
x86/tdx: Disable NOTIFY_ENABLES
x86/tdx: Relax SEPT_VE_DISABLE check for debug TD
x86/tdx: Use ReportFatalError to report missing SEPT_VE_DISABLE
x86/tdx: Expand __tdx_hypercall() to handle more arguments
x86/tdx: Refactor __tdx_hypercall() to allow pass down more arguments
x86/tdx: Add more registers to struct tdx_hypercall_args
x86/tdx: Fix typo in comment in __tdx_hypercall()
This commit is contained in:
Linus Torvalds
commit
d8e473182a
@ -13,6 +13,12 @@
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/*
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* Bitmasks of exposed registers (with VMM).
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*/
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#define TDX_RDX BIT(2)
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#define TDX_RBX BIT(3)
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#define TDX_RSI BIT(6)
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#define TDX_RDI BIT(7)
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#define TDX_R8 BIT(8)
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#define TDX_R9 BIT(9)
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#define TDX_R10 BIT(10)
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#define TDX_R11 BIT(11)
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#define TDX_R12 BIT(12)
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@ -27,9 +33,9 @@
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* details can be found in TDX GHCI specification, section
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* titled "TDCALL [TDG.VP.VMCALL] leaf".
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*/
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#define TDVMCALL_EXPOSE_REGS_MASK ( TDX_R10 | TDX_R11 | \
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TDX_R12 | TDX_R13 | \
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TDX_R14 | TDX_R15 )
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#define TDVMCALL_EXPOSE_REGS_MASK \
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( TDX_RDX | TDX_RBX | TDX_RSI | TDX_RDI | TDX_R8 | TDX_R9 | \
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TDX_R10 | TDX_R11 | TDX_R12 | TDX_R13 | TDX_R14 | TDX_R15 )
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.section .noinstr.text, "ax"
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@ -126,25 +132,38 @@ SYM_FUNC_START(__tdx_hypercall)
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push %r14
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push %r13
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push %r12
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push %rbx
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/* Free RDI and RSI to be used as TDVMCALL arguments */
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movq %rdi, %rax
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push %rsi
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/* Copy hypercall registers from arg struct: */
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movq TDX_HYPERCALL_r8(%rax), %r8
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movq TDX_HYPERCALL_r9(%rax), %r9
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movq TDX_HYPERCALL_r10(%rax), %r10
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movq TDX_HYPERCALL_r11(%rax), %r11
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movq TDX_HYPERCALL_r12(%rax), %r12
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movq TDX_HYPERCALL_r13(%rax), %r13
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movq TDX_HYPERCALL_r14(%rax), %r14
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movq TDX_HYPERCALL_r15(%rax), %r15
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movq TDX_HYPERCALL_rdi(%rax), %rdi
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movq TDX_HYPERCALL_rsi(%rax), %rsi
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movq TDX_HYPERCALL_rbx(%rax), %rbx
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movq TDX_HYPERCALL_rdx(%rax), %rdx
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push %rax
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/* Mangle function call ABI into TDCALL ABI: */
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/* Set TDCALL leaf ID (TDVMCALL (0)) in RAX */
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xor %eax, %eax
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/* Copy hypercall registers from arg struct: */
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movq TDX_HYPERCALL_r10(%rdi), %r10
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movq TDX_HYPERCALL_r11(%rdi), %r11
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movq TDX_HYPERCALL_r12(%rdi), %r12
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movq TDX_HYPERCALL_r13(%rdi), %r13
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movq TDX_HYPERCALL_r14(%rdi), %r14
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movq TDX_HYPERCALL_r15(%rdi), %r15
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movl $TDVMCALL_EXPOSE_REGS_MASK, %ecx
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tdcall
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/*
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* RAX==0 indicates a failure of the TDVMCALL mechanism itself and that
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* RAX!=0 indicates a failure of the TDVMCALL mechanism itself and that
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* something has gone horribly wrong with the TDX module.
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*
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* The return status of the hypercall operation is in a separate
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@ -154,30 +173,46 @@ SYM_FUNC_START(__tdx_hypercall)
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testq %rax, %rax
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jne .Lpanic
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pop %rax
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/* Copy hypercall result registers to arg struct if needed */
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testq $TDX_HCALL_HAS_OUTPUT, (%rsp)
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jz .Lout
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movq %r8, TDX_HYPERCALL_r8(%rax)
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movq %r9, TDX_HYPERCALL_r9(%rax)
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movq %r10, TDX_HYPERCALL_r10(%rax)
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movq %r11, TDX_HYPERCALL_r11(%rax)
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movq %r12, TDX_HYPERCALL_r12(%rax)
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movq %r13, TDX_HYPERCALL_r13(%rax)
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movq %r14, TDX_HYPERCALL_r14(%rax)
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movq %r15, TDX_HYPERCALL_r15(%rax)
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movq %rdi, TDX_HYPERCALL_rdi(%rax)
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movq %rsi, TDX_HYPERCALL_rsi(%rax)
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movq %rbx, TDX_HYPERCALL_rbx(%rax)
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movq %rdx, TDX_HYPERCALL_rdx(%rax)
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.Lout:
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/* TDVMCALL leaf return code is in R10 */
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movq %r10, %rax
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/* Copy hypercall result registers to arg struct if needed */
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testq $TDX_HCALL_HAS_OUTPUT, %rsi
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jz .Lout
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movq %r10, TDX_HYPERCALL_r10(%rdi)
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movq %r11, TDX_HYPERCALL_r11(%rdi)
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movq %r12, TDX_HYPERCALL_r12(%rdi)
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movq %r13, TDX_HYPERCALL_r13(%rdi)
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movq %r14, TDX_HYPERCALL_r14(%rdi)
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movq %r15, TDX_HYPERCALL_r15(%rdi)
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.Lout:
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/*
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* Zero out registers exposed to the VMM to avoid speculative execution
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* with VMM-controlled values. This needs to include all registers
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* present in TDVMCALL_EXPOSE_REGS_MASK (except R12-R15). R12-R15
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* context will be restored.
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* present in TDVMCALL_EXPOSE_REGS_MASK, except RBX, and R12-R15 which
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* will be restored.
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*/
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xor %r8d, %r8d
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xor %r9d, %r9d
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xor %r10d, %r10d
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xor %r11d, %r11d
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xor %rdi, %rdi
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xor %rdx, %rdx
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/* Remove TDX_HCALL_* flags from the stack */
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pop %rsi
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/* Restore callee-saved GPRs as mandated by the x86_64 ABI */
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pop %rbx
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pop %r12
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pop %r13
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pop %r14
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@ -19,9 +19,14 @@
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#define TDX_GET_VEINFO 3
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#define TDX_GET_REPORT 4
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#define TDX_ACCEPT_PAGE 6
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#define TDX_WR 8
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/* TDCS fields. To be used by TDG.VM.WR and TDG.VM.RD module calls */
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#define TDCS_NOTIFY_ENABLES 0x9100000000000010
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/* TDX hypercall Leaf IDs */
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#define TDVMCALL_MAP_GPA 0x10001
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#define TDVMCALL_REPORT_FATAL_ERROR 0x10003
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/* MMIO direction */
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#define EPT_READ 0
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@ -37,6 +42,7 @@
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#define VE_GET_PORT_NUM(e) ((e) >> 16)
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#define VE_IS_IO_STRING(e) ((e) & BIT(4))
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#define ATTR_DEBUG BIT(0)
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#define ATTR_SEPT_VE_DISABLE BIT(28)
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/* TDX Module call error codes */
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@ -141,6 +147,41 @@ int tdx_mcall_get_report0(u8 *reportdata, u8 *tdreport)
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}
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EXPORT_SYMBOL_GPL(tdx_mcall_get_report0);
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static void __noreturn tdx_panic(const char *msg)
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{
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struct tdx_hypercall_args args = {
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.r10 = TDX_HYPERCALL_STANDARD,
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.r11 = TDVMCALL_REPORT_FATAL_ERROR,
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.r12 = 0, /* Error code: 0 is Panic */
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};
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union {
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/* Define register order according to the GHCI */
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struct { u64 r14, r15, rbx, rdi, rsi, r8, r9, rdx; };
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char str[64];
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} message;
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/* VMM assumes '\0' in byte 65, if the message took all 64 bytes */
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strncpy(message.str, msg, 64);
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args.r8 = message.r8;
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args.r9 = message.r9;
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args.r14 = message.r14;
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args.r15 = message.r15;
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args.rdi = message.rdi;
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args.rsi = message.rsi;
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args.rbx = message.rbx;
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args.rdx = message.rdx;
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/*
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* This hypercall should never return and it is not safe
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* to keep the guest running. Call it forever if it
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* happens to return.
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*/
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while (1)
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__tdx_hypercall(&args, 0);
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}
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static void tdx_parse_tdinfo(u64 *cc_mask)
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{
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struct tdx_module_output out;
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@ -172,8 +213,15 @@ static void tdx_parse_tdinfo(u64 *cc_mask)
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* TD-private memory. Only VMM-shared memory (MMIO) will #VE.
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*/
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td_attr = out.rdx;
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if (!(td_attr & ATTR_SEPT_VE_DISABLE))
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panic("TD misconfiguration: SEPT_VE_DISABLE attibute must be set.\n");
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if (!(td_attr & ATTR_SEPT_VE_DISABLE)) {
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const char *msg = "TD misconfiguration: SEPT_VE_DISABLE attribute must be set.";
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/* Relax SEPT_VE_DISABLE check for debug TD. */
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if (td_attr & ATTR_DEBUG)
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pr_warn("%s\n", msg);
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else
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tdx_panic(msg);
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}
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}
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/*
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@ -617,6 +665,11 @@ static int virt_exception_user(struct pt_regs *regs, struct ve_info *ve)
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}
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}
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static inline bool is_private_gpa(u64 gpa)
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{
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return gpa == cc_mkenc(gpa);
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}
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/*
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* Handle the kernel #VE.
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*
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@ -635,6 +688,8 @@ static int virt_exception_kernel(struct pt_regs *regs, struct ve_info *ve)
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case EXIT_REASON_CPUID:
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return handle_cpuid(regs, ve);
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case EXIT_REASON_EPT_VIOLATION:
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if (is_private_gpa(ve->gpa))
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panic("Unexpected EPT-violation on private memory.");
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return handle_mmio(regs, ve);
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case EXIT_REASON_IO_INSTRUCTION:
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return handle_io(regs, ve);
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@ -801,6 +856,9 @@ void __init tdx_early_init(void)
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tdx_parse_tdinfo(&cc_mask);
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cc_set_mask(cc_mask);
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/* Kernel does not use NOTIFY_ENABLES and does not need random #VEs */
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tdx_module_call(TDX_WR, 0, TDCS_NOTIFY_ENABLES, 0, -1ULL, NULL);
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/*
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* All bits above GPA width are reserved and kernel treats shared bit
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* as flag, not as part of physical address.
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@ -21,12 +21,18 @@
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* This is a software only structure and not part of the TDX module/VMM ABI.
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*/
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struct tdx_hypercall_args {
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u64 r8;
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u64 r9;
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u64 r10;
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u64 r11;
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u64 r12;
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u64 r13;
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u64 r14;
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u64 r15;
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u64 rdi;
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u64 rsi;
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u64 rbx;
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u64 rdx;
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};
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/* Used to request services from the VMM */
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@ -76,12 +76,18 @@ static void __used common(void)
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OFFSET(TDX_MODULE_r11, tdx_module_output, r11);
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BLANK();
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OFFSET(TDX_HYPERCALL_r8, tdx_hypercall_args, r8);
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OFFSET(TDX_HYPERCALL_r9, tdx_hypercall_args, r9);
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OFFSET(TDX_HYPERCALL_r10, tdx_hypercall_args, r10);
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OFFSET(TDX_HYPERCALL_r11, tdx_hypercall_args, r11);
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OFFSET(TDX_HYPERCALL_r12, tdx_hypercall_args, r12);
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OFFSET(TDX_HYPERCALL_r13, tdx_hypercall_args, r13);
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OFFSET(TDX_HYPERCALL_r14, tdx_hypercall_args, r14);
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OFFSET(TDX_HYPERCALL_r15, tdx_hypercall_args, r15);
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OFFSET(TDX_HYPERCALL_rdi, tdx_hypercall_args, rdi);
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OFFSET(TDX_HYPERCALL_rsi, tdx_hypercall_args, rsi);
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OFFSET(TDX_HYPERCALL_rbx, tdx_hypercall_args, rbx);
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OFFSET(TDX_HYPERCALL_rdx, tdx_hypercall_args, rdx);
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BLANK();
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OFFSET(BP_scratch, boot_params, scratch);
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