This series is split in two parts:
- patch 7 fixes a bug in string I/O emulation for SEV-ES, where
the size of the GHCB buffer can exceed the size of vcpu->arch.pio_data.
If that happens, we need to go over the GHCB buffer in multiple passes.
There are some preliminary cleanups in patches 1/3/6 too.
- the other patches clean emulator_pio_in and emulator_pio_in_out. The
first changes (patches 2/3/5) are more localized; they make the final
SEV code a little easier to follow, and they remove unnecessary
function arguments so that it is clearer which functions consume
vcpu->arch.pio and which don't. Patches starting from 8 on, instead,
remove all usage of vcpu->arch.pio unless a userspace KVM_EXIT_IO is
required. In the end, IN is split clearly into a function that
(if needed) fills in vcpu->arch.pio, and one that is intended for
completion callbacks and consumes it.
Tested by booting a SEV-ES guest and with "regular" kvm-unit-tests.
Paolo
Paolo Bonzini (13):
KVM: SEV-ES: rename guest_ins_data to sev_pio_data
KVM: x86: leave vcpu->arch.pio.count alone in emulator_pio_in_out
KVM: SEV-ES: clean up kvm_sev_es_ins/outs
KVM: x86: split the two parts of emulator_pio_in
KVM: x86: remove unnecessary arguments from complete_emulator_pio_in
KVM: SEV-ES: keep INS functions together
KVM: SEV-ES: go over the sev_pio_data buffer in multiple passes if
needed
KVM: x86: inline kernel_pio into its sole caller
KVM: x86: move all vcpu->arch.pio* setup in emulator_pio_in_out
KVM: x86: wean in-kernel PIO from vcpu->arch.pio*
KVM: x86: wean fast IN from emulator_pio_in
KVM: x86: de-underscorify __emulator_pio_in
KVM: SEV-ES: reuse advance_sev_es_emulated_ins for OUT too
arch/x86/include/asm/kvm_host.h | 3 +-
arch/x86/kvm/trace.h | 2 +-
arch/x86/kvm/x86.c | 193 +++++++++++++++++++-------------
3 files changed, 117 insertions(+), 81 deletions(-)
--
2.27.0
