Alexander Graf wrote:
Hi,
When transitioning from KVM to the qemu userspace, we try to get and
push a whole bunch of MSR values, including the SYSENTER ones. While
this is basically a good idea, qemu doesn't know anything about
SYSENTER on x86_64, which is an additional feature only available on
Intel CPUs and thus defines SYSENTER_EIP and SYSENTER_ESP as 32-bit
values.
Because we're saving/restoring the SYSENTER values on transitions to
userspace and the values in env->cpu only hold 32 bits, they get
truncated to 32-bit. The easiest way around this is to widen the
fields to 64 bits. This should not disturb the current functionality,
but allows us to run 32-bit code on x86_64 using VMX.
As this is KVM specific for now, I'll only CC the qemu mailinglist,
but wouldn't encourage qemu to take the patch for now, as it's not
necessary when emulating an AMD CPU.
Applied, thanks. I imagine save/restore support needs updating as
well? That should go into qemuy btw since maintaining the save/restore
format across forks isn't possible.
--
error compiling committee.c: too many arguments to function
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