Messages in this thread | | | Date | Fri, 20 May 2022 17:33:05 +0000 | From | Sean Christopherson <> | Subject | Re: [PATCHv2 1/3] x86/tdx: Fix early #VE handling |
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On Fri, May 20, 2022, Sean Christopherson wrote: > On Fri, May 20, 2022, Kirill A. Shutemov wrote: > > Move RIP in tdx_early_handle_ve() after handling the exception. Failure > > to do that leads to infinite loop of exceptions. > > > > Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> > > Fixes: 32e72854fa5f ("x86/tdx: Port I/O: Add early boot support") > > --- > > arch/x86/coco/tdx/tdx.c | 6 +++++- > > 1 file changed, 5 insertions(+), 1 deletion(-) > > > > diff --git a/arch/x86/coco/tdx/tdx.c b/arch/x86/coco/tdx/tdx.c > > index 03deb4d6920d..faae53f8d559 100644 > > --- a/arch/x86/coco/tdx/tdx.c > > +++ b/arch/x86/coco/tdx/tdx.c > > @@ -447,13 +447,17 @@ static bool handle_io(struct pt_regs *regs, u32 exit_qual) > > __init bool tdx_early_handle_ve(struct pt_regs *regs) > > { > > struct ve_info ve; > > + bool ret; > > > > tdx_get_ve_info(&ve); > > > > if (ve.exit_reason != EXIT_REASON_IO_INSTRUCTION) > > return false; > > > > - return handle_io(regs, ve.exit_qual); > > + ret = handle_io(regs, ve.exit_qual); > > + if (ret) > > Ugh, the boolean returns instead of 0/-errno are fugly. At first glance I thought > this was wrong, i.e. advancing RIP on failure. > > Assuming moving away from booleans isn't happening anytime soon maybe s/ret/success > or s/ret/handled to make it more obvious that it's a happy path?
Doh, should have looked at patch 2...
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