diff options
| author | H. Peter Anvin (Intel) <hpa@zytor.com> | 2023-12-05 13:50:10 +0300 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2024-02-01 00:02:05 +0300 |
| commit | 58c80cc55e079933205597ecf846583c5e6e4946 (patch) | |
| tree | 2b54393d01a8e565e0baa10a21be3a0fdea1f332 /arch/x86/mm | |
| parent | ad41a14cc2d66229479d73e4a7dc1fda26827666 (diff) | |
| download | linux-58c80cc55e079933205597ecf846583c5e6e4946.tar.xz | |
x86/fred: Make exc_page_fault() work for FRED
On a FRED system, the faulting address (CR2) is passed on the stack,
to avoid the problem of transient state. Thus the page fault address
is read from the FRED stack frame instead of CR2 when FRED is enabled.
Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
Signed-off-by: Xin Li <xin3.li@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Tested-by: Shan Kang <shan.kang@intel.com>
Link: https://lore.kernel.org/r/20231205105030.8698-22-xin3.li@intel.com
Diffstat (limited to 'arch/x86/mm')
| -rw-r--r-- | arch/x86/mm/fault.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c index 679b09cfe241..fa2d69951f25 100644 --- a/arch/x86/mm/fault.c +++ b/arch/x86/mm/fault.c @@ -34,6 +34,7 @@ #include <asm/kvm_para.h> /* kvm_handle_async_pf */ #include <asm/vdso.h> /* fixup_vdso_exception() */ #include <asm/irq_stack.h> +#include <asm/fred.h> #define CREATE_TRACE_POINTS #include <asm/trace/exceptions.h> @@ -1518,8 +1519,10 @@ handle_page_fault(struct pt_regs *regs, unsigned long error_code, DEFINE_IDTENTRY_RAW_ERRORCODE(exc_page_fault) { - unsigned long address = read_cr2(); irqentry_state_t state; + unsigned long address; + + address = cpu_feature_enabled(X86_FEATURE_FRED) ? fred_event_data(regs) : read_cr2(); prefetchw(¤t->mm->mmap_lock); |