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Date: Wed, 9 Jun 2021 14:50:44 -0700
From: Kuppuswamy Sathyanarayanan
<sathyanarayanan.kuppuswamy@...ux.intel.com>
To: Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
Peter Zijlstra <peterz@...radead.org>,
Andy Lutomirski <luto@...nel.org>
Cc: Peter H Anvin <hpa@...or.com>, Dave Hansen <dave.hansen@...el.com>,
Tony Luck <tony.luck@...el.com>,
Dan Williams <dan.j.williams@...el.com>,
Andi Kleen <ak@...ux.intel.com>,
Kirill Shutemov <kirill.shutemov@...ux.intel.com>,
Sean Christopherson <seanjc@...gle.com>,
Kuppuswamy Sathyanarayanan <knsathya@...nel.org>,
x86@...nel.org, linux-kernel@...r.kernel.org,
Sean Christopherson <sean.j.christopherson@...el.com>
Subject: [PATCH v1 2/5] x86/boot: Avoid #VE during boot for TDX platforms
From: Sean Christopherson <sean.j.christopherson@...el.com>
There are a few MSRs and control register bits which the kernel
normally needs to modify during boot. But, TDX disallows
modification of these registers to help provide consistent
security guarantees. Fortunately, TDX ensures that these are all
in the correct state before the kernel loads, which means the
kernel has no need to modify them.
The conditions to avoid are:
* Any writes to the EFER MSR
* Clearing CR0.NE
* Clearing CR3.MCE
This theoretically makes guest boot more fragile. If, for
instance, EFER was set up incorrectly and a WRMSR was performed,
it will trigger early exception panic or a triple fault, if it's
before early exceptions are set up. However, this is likely to
trip up the guest BIOS long before control reaches the kernel. In
any case, these kinds of problems are unlikely to occur in
production environments, and developers have good debug
tools to fix them quickly.
Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
Reviewed-by: Andi Kleen <ak@...ux.intel.com>
Reviewed-by: Dan Williams <dan.j.williams@...el.com>
Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
---
arch/x86/boot/compressed/head_64.S | 16 ++++++++++++----
arch/x86/boot/compressed/pgtable.h | 2 +-
arch/x86/kernel/head_64.S | 20 ++++++++++++++++++--
arch/x86/realmode/rm/trampoline_64.S | 23 +++++++++++++++++++----
4 files changed, 50 insertions(+), 11 deletions(-)
diff --git a/arch/x86/boot/compressed/head_64.S b/arch/x86/boot/compressed/head_64.S
index a2347ded77ea..0c68e3adc940 100644
--- a/arch/x86/boot/compressed/head_64.S
+++ b/arch/x86/boot/compressed/head_64.S
@@ -640,12 +640,20 @@ SYM_CODE_START(trampoline_32bit_src)
movl $MSR_EFER, %ecx
rdmsr
btsl $_EFER_LME, %eax
+ /* Avoid writing EFER if no change was made (for TDX guest) */
+ jc 1f
wrmsr
- popl %edx
+1: popl %edx
popl %ecx
/* Enable PAE and LA57 (if required) paging modes */
- movl $X86_CR4_PAE, %eax
+ movl %cr4, %eax
+ /*
+ * Clear all bits except CR4.MCE, which is preserved.
+ * Clearing CR4.MCE will #VE in TDX guests.
+ */
+ andl $X86_CR4_MCE, %eax
+ orl $X86_CR4_PAE, %eax
testl %edx, %edx
jz 1f
orl $X86_CR4_LA57, %eax
@@ -659,8 +667,8 @@ SYM_CODE_START(trampoline_32bit_src)
pushl $__KERNEL_CS
pushl %eax
- /* Enable paging again */
- movl $(X86_CR0_PG | X86_CR0_PE), %eax
+ /* Enable paging again. Avoid clearing X86_CR0_NE for TDX */
+ movl $(X86_CR0_PG | X86_CR0_NE | X86_CR0_PE), %eax
movl %eax, %cr0
lret
diff --git a/arch/x86/boot/compressed/pgtable.h b/arch/x86/boot/compressed/pgtable.h
index 6ff7e81b5628..cc9b2529a086 100644
--- a/arch/x86/boot/compressed/pgtable.h
+++ b/arch/x86/boot/compressed/pgtable.h
@@ -6,7 +6,7 @@
#define TRAMPOLINE_32BIT_PGTABLE_OFFSET 0
#define TRAMPOLINE_32BIT_CODE_OFFSET PAGE_SIZE
-#define TRAMPOLINE_32BIT_CODE_SIZE 0x70
+#define TRAMPOLINE_32BIT_CODE_SIZE 0x80
#define TRAMPOLINE_32BIT_STACK_END TRAMPOLINE_32BIT_SIZE
diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S
index 04bddaaba8e2..6cf8d126b80a 100644
--- a/arch/x86/kernel/head_64.S
+++ b/arch/x86/kernel/head_64.S
@@ -141,7 +141,13 @@ SYM_INNER_LABEL(secondary_startup_64_no_verify, SYM_L_GLOBAL)
1:
/* Enable PAE mode, PGE and LA57 */
- movl $(X86_CR4_PAE | X86_CR4_PGE), %ecx
+ movq %cr4, %rcx
+ /*
+ * Clear all bits except CR4.MCE, which is preserved.
+ * Clearing CR4.MCE will #VE in TDX guests.
+ */
+ andl $X86_CR4_MCE, %ecx
+ orl $(X86_CR4_PAE | X86_CR4_PGE), %ecx
#ifdef CONFIG_X86_5LEVEL
testl $1, __pgtable_l5_enabled(%rip)
jz 1f
@@ -229,13 +235,23 @@ SYM_INNER_LABEL(secondary_startup_64_no_verify, SYM_L_GLOBAL)
/* Setup EFER (Extended Feature Enable Register) */
movl $MSR_EFER, %ecx
rdmsr
+ /*
+ * Preserve current value of EFER for comparison and to skip
+ * EFER writes if no change was made (for TDX guest)
+ */
+ movl %eax, %edx
btsl $_EFER_SCE, %eax /* Enable System Call */
btl $20,%edi /* No Execute supported? */
jnc 1f
btsl $_EFER_NX, %eax
btsq $_PAGE_BIT_NX,early_pmd_flags(%rip)
-1: wrmsr /* Make changes effective */
+ /* Avoid writing EFER if no change was made (for TDX guest) */
+1: cmpl %edx, %eax
+ je 1f
+ xor %edx, %edx
+ wrmsr /* Make changes effective */
+1:
/* Setup cr0 */
movl $CR0_STATE, %eax
/* Make changes effective */
diff --git a/arch/x86/realmode/rm/trampoline_64.S b/arch/x86/realmode/rm/trampoline_64.S
index ae112a91592f..0fdd74054044 100644
--- a/arch/x86/realmode/rm/trampoline_64.S
+++ b/arch/x86/realmode/rm/trampoline_64.S
@@ -143,13 +143,27 @@ SYM_CODE_START(startup_32)
movl %eax, %cr3
# Set up EFER
+ movl $MSR_EFER, %ecx
+ rdmsr
+ /*
+ * Skip writing to EFER if the register already has desired
+ * value (to avoid #VE for the TDX guest).
+ */
+ cmp pa_tr_efer, %eax
+ jne .Lwrite_efer
+ cmp pa_tr_efer + 4, %edx
+ je .Ldone_efer
+.Lwrite_efer:
movl pa_tr_efer, %eax
movl pa_tr_efer + 4, %edx
- movl $MSR_EFER, %ecx
wrmsr
- # Enable paging and in turn activate Long Mode
- movl $(X86_CR0_PG | X86_CR0_WP | X86_CR0_PE), %eax
+.Ldone_efer:
+ /*
+ * Enable paging and in turn activate Long Mode. Avoid clearing
+ * X86_CR0_NE for TDX.
+ */
+ movl $(X86_CR0_PG | X86_CR0_WP | X86_CR0_NE | X86_CR0_PE), %eax
movl %eax, %cr0
/*
@@ -169,7 +183,8 @@ SYM_CODE_START(pa_trampoline_compat)
movl $rm_stack_end, %esp
movw $__KERNEL_DS, %dx
- movl $X86_CR0_PE, %eax
+ /* Avoid clearing X86_CR0_NE for TDX */
+ movl $(X86_CR0_NE | X86_CR0_PE), %eax
movl %eax, %cr0
ljmpl $__KERNEL32_CS, $pa_startup_32
SYM_CODE_END(pa_trampoline_compat)
--
2.25.1
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