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x86/fred: Fix 64bit identifier in fred_ss

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FRED can only be enabled in Long Mode.  This is the 64bit mode (as opposed to
compatibility mode) identifier, rather than being something hard-wired at 1.

No functional change.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Xin Li (Intel) <xin@zytor.com>
Reviewed-by: H. Peter Anvin (Intel) <hpa@zytor.com>
Acked-by: H. Peter Anvin (Intel) <hpa@zytor.com>
This commit is contained in:
Andrew Cooper
2025-09-03 00:01:17 +01:00
committed by Dave Hansen
parent 3a86608788
commit 4ab13be5ed
3 changed files with 5 additions and 5 deletions
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4
arch/x86/entry/entry_fred.c
View File

@@ -78,13 +78,13 @@ static noinstr void fred_intx(struct pt_regs *regs)
static __always_inline void fred_other(struct pt_regs *regs)
{
/* The compiler can fold these conditions into a single test */
if (likely(regs->fred_ss.vector == FRED_SYSCALL && regs->fred_ss.lm)) {
if (likely(regs->fred_ss.vector == FRED_SYSCALL && regs->fred_ss.l)) {
regs->orig_ax = regs->ax;
regs->ax = -ENOSYS;
do_syscall_64(regs, regs->orig_ax);
return;
} else if (ia32_enabled() &&
likely(regs->fred_ss.vector == FRED_SYSENTER && !regs->fred_ss.lm)) {
likely(regs->fred_ss.vector == FRED_SYSENTER && !regs->fred_ss.l)) {
regs->orig_ax = regs->ax;
regs->ax = -ENOSYS;
do_fast_syscall_32(regs);

2
arch/x86/include/asm/fred.h
View File

@@ -79,7 +79,7 @@ static __always_inline void fred_entry_from_kvm(unsigned int type, unsigned int
.type = type,
.vector = vector,
.nmi = type == EVENT_TYPE_NMI,
.lm = 1,
.l = 1,
};
asm_fred_entry_from_kvm(ss);

4
arch/x86/include/asm/ptrace.h
View File

@@ -84,8 +84,8 @@ struct fred_ss {
: 4,
/* Event was incident to enclave execution */
enclave : 1,
/* CPU was in long mode */
lm : 1,
/* CPU was in 64-bit mode */
l : 1,
/*
* Nested exception during FRED delivery, not set
* for #DF.