Hi, On 9/7/21 2:51 PM, Peter Maydell wrote: > On Sun, 22 Aug 2021 at 15:45, Marc Zyngier <maz@xxxxxxxxxx> wrote: >> The documentation for the 'highmem' option indicates that it controls >> the placement of both devices and RAM. The actual behaviour of QEMU >> seems to be that RAM is allowed to go beyond the 4GiB limit, and >> that only devices are constraint by this option. >> >> Align the documentation with the actual behaviour. > I think it would be better to align the behaviour with the documentation. > > The intent of 'highmem' is to allow a configuration for use with guests > that can't address more than 32 bits (originally, 32-bit guests without > LPAE support compiled in). It seems like a bug that we allow the user > to specify more RAM than will fit into that 32-bit range. We should > instead make QEMU exit with an error if the user tries to specify > both highmem=off and a memory size that's too big to fit. That's my opinion too Thanks Eric > > thanks > -- PMM >
