search for: get_stack_info

From: Joerg Roedel <jroedel at suse.de> The get_stack_info functionality is needed in the entry code for the #VC exception handler. Provide a version of it in the .text.noinstr section which can be called safely from there. Signed-off-by: Joerg Roedel <jroedel at suse.de> Link: https://lore.kernel.org/r/20200724160336.5435-47-joro at 8bytes.org ---...

...+ goto sync; > + } > + > + /* > + * From here on the the RSP value is trusted - more RSP sanity checks > + * need to happen above. > + * > + * Check whether entry happened from a safe stack. > + */ > + sp = eregs->sp; > + stack = (unsigned long *)sp; > + get_stack_info_noinstr(stack, current, &info); > + > + /* > + * Don't sync to entry stack or other unknown stacks - use the fall-back > + * stack instead. > + */ > + if (info.type == STACK_TYPE_UNKNOWN || info.type == STACK_TYPE_ENTRY || AFAICT, that STACK_TYPE_UNKNOWN gets set only...

...o->end = (unsigned long *)end; + info->next_sp = (unsigned long *)regs->sp; + + return true; +#else + return false; +#endif +} + static bool in_exception_stack(unsigned long *stack, struct stack_info *info) { unsigned long begin, end, stk = (unsigned long)stack; @@ -173,6 +217,9 @@ int get_stack_info(unsigned long *stack, struct task_struct *task, if (in_entry_stack(stack, info)) goto recursion_check; + if (in_vc_exception_stack(stack, info)) + goto recursion_check; + goto unknown; recursion_check: diff --git a/arch/x86/kernel/sev-es.c b/arch/x86/kernel/sev-es.c index e5d87f2af357....

...6/sev-es: Compile early handler code into kernel image x86/sev-es: Setup early #VC handler x86/sev-es: Setup GHCB based boot #VC handler x86/sev-es: Allocate and Map IST stack for #VC handler x86/sev-es: Adjust #VC IST Stack on entering NMI handler x86/dumpstack/64: Add noinstr version of get_stack_info() x86/entry/64: Add entry code for #VC handler x86/sev-es: Wire up existing #VC exit-code handlers x86/sev-es: Handle instruction fetches from user-space x86/sev-es: Handle MMIO String Instructions x86/sev-es: Handle #AC Events x86/sev-es: Handle #DB Events x86/paravirt: Allow hypervi...

...6/sev-es: Compile early handler code into kernel image x86/sev-es: Setup early #VC handler x86/sev-es: Setup GHCB based boot #VC handler x86/sev-es: Allocate and Map IST stack for #VC handler x86/sev-es: Adjust #VC IST Stack on entering NMI handler x86/dumpstack/64: Add noinstr version of get_stack_info() x86/entry/64: Add entry code for #VC handler x86/sev-es: Wire up existing #VC exit-code handlers x86/sev-es: Handle instruction fetches from user-space x86/sev-es: Handle MMIO String Instructions x86/sev-es: Handle #AC Events x86/sev-es: Handle #DB Events x86/paravirt: Allow hypervi...

...image x86/sev-es: Setup early #VC handler x86/sev-es: Setup GHCB based boot #VC handler x86/sev-es: Allocate and Map stacks for #VC handler x86/sev-es: Allocate and setup IST entry for #VC x86/sev-es: Adjust #VC IST Stack on entering NMI handler x86/dumpstack/64: Add noinstr version of get_stack_info() x86/entry/64: Add entry code for #VC handler x86/sev-es: Wire up existing #VC exit-code handlers x86/sev-es: Handle instruction fetches from user-space x86/sev-es: Handle MMIO String Instructions x86/sev-es: Handle #AC Events x86/sev-es: Handle #DB Events x86/paravirt: Allow hypervi...

...image x86/sev-es: Setup early #VC handler x86/sev-es: Setup GHCB based boot #VC handler x86/sev-es: Allocate and Map stacks for #VC handler x86/sev-es: Allocate and setup IST entry for #VC x86/sev-es: Adjust #VC IST Stack on entering NMI handler x86/dumpstack/64: Add noinstr version of get_stack_info() x86/entry/64: Add entry code for #VC handler x86/sev-es: Wire up existing #VC exit-code handlers x86/sev-es: Handle instruction fetches from user-space x86/sev-es: Handle MMIO String Instructions x86/sev-es: Handle #AC Events x86/sev-es: Handle #DB Events x86/paravirt: Allow hypervi...

...6/sev-es: Compile early handler code into kernel image x86/sev-es: Setup early #VC handler x86/sev-es: Setup GHCB based boot #VC handler x86/sev-es: Allocate and Map IST stack for #VC handler x86/sev-es: Adjust #VC IST Stack on entering NMI handler x86/dumpstack/64: Add noinstr version of get_stack_info() x86/entry/64: Add entry code for #VC handler x86/sev-es: Wire up existing #VC exit-code handlers x86/sev-es: Handle instruction fetches from user-space x86/sev-es: Handle MMIO String Instructions x86/sev-es: Handle #AC Events x86/sev-es: Handle #DB Events x86/paravirt: Allow hypervi...

...6/sev-es: Compile early handler code into kernel image x86/sev-es: Setup early #VC handler x86/sev-es: Setup GHCB based boot #VC handler x86/sev-es: Allocate and Map IST stack for #VC handler x86/sev-es: Adjust #VC IST Stack on entering NMI handler x86/dumpstack/64: Add noinstr version of get_stack_info() x86/entry/64: Add entry code for #VC handler x86/sev-es: Wire up existing #VC exit-code handlers x86/sev-es: Handle instruction fetches from user-space x86/sev-es: Handle MMIO String Instructions x86/sev-es: Handle #AC Events x86/sev-es: Handle #DB Events x86/paravirt: Allow hypervi...

Hi, here is the next version of changes to enable Linux to run as an SEV-ES guest. The code was rebased to v5.7-rc3 and got a fair number of changes since the last version. What is SEV-ES ============== SEV-ES is an acronym for 'Secure Encrypted Virtualization - Encrypted State' and means a hardware feature of AMD processors which hides the register state of VCPUs to the hypervisor by

Hi, here is the next version of changes to enable Linux to run as an SEV-ES guest. The code was rebased to v5.7-rc3 and got a fair number of changes since the last version. What is SEV-ES ============== SEV-ES is an acronym for 'Secure Encrypted Virtualization - Encrypted State' and means a hardware feature of AMD processors which hides the register state of VCPUs to the hypervisor by