From: Jan Beulich Date: Tue, 4 Dec 2018 13:02:46 +0000 (+0100) Subject: x86emul: skip VIF processing in VME mode for 16-bit POPF at IOPL 3 X-Git-Tag: archive/raspbian/4.14.0+80-gd101b417b7-1+rpi1^2~63^2~2805 X-Git-Url: https://dgit.raspbian.org/%22http:/www.example.com/cgi/%22https://%22%22/%22http:/www.example.com/cgi/%22https:/%22%22?a=commitdiff_plain;h=6b4600b1425ef8006efcd2cdb4c4c986309264f6;p=xen.git x86emul: skip VIF processing in VME mode for 16-bit POPF at IOPL 3 At IOPL 3 CR4.VME is irrelevant. Reported-by: Andrew Cooper Signed-off-by: Jan Beulich Reviewed-by: Andrew Cooper --- diff --git a/xen/arch/x86/x86_emulate/x86_emulate.c b/xen/arch/x86/x86_emulate/x86_emulate.c index 0ae433538e..5313145b63 100644 --- a/xen/arch/x86/x86_emulate/x86_emulate.c +++ b/xen/arch/x86/x86_emulate/x86_emulate.c @@ -4223,7 +4223,8 @@ x86_emulate( if ( op_bytes == 2 ) { dst.val = (uint16_t)dst.val | (_regs.eflags & 0xffff0000u); - if ( cr4 & X86_CR4_VME ) + if ( (cr4 & X86_CR4_VME) && + MASK_EXTR(_regs.eflags, X86_EFLAGS_IOPL) != 3 ) { if ( dst.val & X86_EFLAGS_IF ) {