search for: __nmi_exit

Displaying 2 results from an estimated 2 matches for "__nmi_exit".

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2020 Jun 23
2
Should SEV-ES #VC use IST? (Re: [PATCH] Allow RDTSC and RDTSCP from userspace)
...iles changed, 18 insertions(+), 1 deletion(-) diff --git a/arch/x86/entry/common.c b/arch/x86/entry/common.c index af0d57ed5e69..e38e4f34c90c 100644 --- a/arch/x86/entry/common.c +++ b/arch/x86/entry/common.c @@ -742,6 +742,13 @@ noinstr void idtentry_exit_nmi(struct pt_regs *regs, bool restore) __nmi_exit(); } +noinstr void idtentry_validate_ist(struct pt_regs *regs) +{ + if ((regs->sp & ~(EXCEPTION_STKSZ-1)) == + (_RET_IP_ & ~(EXCEPTION_STKSZ-1))) + die("IST stack recursion", regs, 0); +} + #ifdef CONFIG_XEN_PV #ifndef CONFIG_PREEMPTION /* diff --git a/arch/x86/inclu...
2020 Jun 23
2
Should SEV-ES #VC use IST? (Re: [PATCH] Allow RDTSC and RDTSCP from userspace)
On Tue, Jun 23, 2020 at 02:52:01PM +0200, Peter Zijlstra wrote: > On Tue, Jun 23, 2020 at 02:04:33PM +0200, Joerg Roedel wrote: > > No, the recursion check is fine, because overwriting an already used IST > > stack doesn't matter (as long as it can be detected) if we are going to > > panic anyway. It doesn't matter because the kernel will not leave the > >