search for: 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 ---...

...6/include/asm/stacktrace.h @@ -21,6 +21,10 @@ enum stack_type { STACK_TYPE_ENTRY, STACK_TYPE_EXCEPTION, STACK_TYPE_EXCEPTION_LAST = STACK_TYPE_EXCEPTION + N_EXCEPTION_STACKS-1, +#ifdef CONFIG_X86_64 + STACK_TYPE_VC, + STACK_TYPE_VC_LAST = STACK_TYPE_VC + N_VC_STACKS - 1, +#endif }; struct stack_info { diff --git a/arch/x86/kernel/dumpstack_64.c b/arch/x86/kernel/dumpstack_64.c index 87b97897a881..2468963c1424 100644 --- a/arch/x86/kernel/dumpstack_64.c +++ b/arch/x86/kernel/dumpstack_64.c @@ -18,6 +18,7 @@ #include <asm/cpu_entry_area.h> #include <asm/stacktrace.h> +#include &l...

...= STACK_TYPE_IRQ) return "IRQ"; @@ -79,6 +81,8 @@ struct estack_pages estack_pages[CEA_ESTACK_PAGES] ____cacheline_aligned = { EPAGERANGE(NMI), EPAGERANGE(DB), EPAGERANGE(MCE), + EPAGERANGE(VC), + EPAGERANGE(VC2), }; static bool in_exception_stack(unsigned long *stack, struct stack_info *info) @@ -88,7 +92,7 @@ static bool in_exception_stack(unsigned long *stack, struct stack_info *info) struct pt_regs *regs; unsigned int k; - BUILD_BUG_ON(N_EXCEPTION_STACKS != 4); + BUILD_BUG_ON(N_EXCEPTION_STACKS != 6); begin = (unsigned long)__this_cpu_read(cea_exception_stacks); /*...

...@@ asmlinkage __visible noinstr struct pt_regs *sync_regs(struct pt_regs *eregs) > return regs; > } > > +#ifdef CONFIG_AMD_MEM_ENCRYPT > +asmlinkage __visible noinstr struct pt_regs *vc_switch_off_ist(struct pt_regs *eregs) > +{ > + unsigned long sp, *stack; > + struct stack_info info; > + struct pt_regs *regs; Let's call those "regs_ret" or so, so that the argument can be "regs" by convention and for better differentiation. > + /* > + * In the SYSCALL entry path the RSP value comes from user-space - don't > + * trust it and switc...

...v-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...

...v-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...

...ge 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...

...ge 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...

...de <asm/traps.h> @@ -674,6 +675,56 @@ asmlinkage __visible noinstr struct pt_regs *sync_regs(struct pt_regs *eregs) return regs; } +#ifdef CONFIG_AMD_MEM_ENCRYPT +asmlinkage __visible noinstr struct pt_regs *vc_switch_off_ist(struct pt_regs *eregs) +{ + unsigned long sp, *stack; + struct stack_info info; + struct pt_regs *regs; + + /* + * In the SYSCALL entry path the RSP value comes from user-space - don't + * trust it and switch to the current kernel stack + */ + if (eregs->ip >= (unsigned long)entry_SYSCALL_64 && + eregs->ip < (unsigned long)entry_SYSCALL_64...

...v-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...

...v-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