search for: e38e4f34c90c

Displaying 2 results from an estimated 2 matches for "e38e4f34c90c".

2020 Jun 23
2
Should SEV-ES #VC use IST? (Re: [PATCH] Allow RDTSC and RDTSCP from userspace)
...ething like this... #DF already dies and NMI is 'magic' --- arch/x86/entry/common.c | 7 +++++++ arch/x86/include/asm/idtentry.h | 12 +++++++++++- 2 files 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_...
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 > >