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| author |   Ken Hofsass <hofsass@google.com> | 2018-01-31 16:03:36 -0800 |
|---|---|---|
| committer |   Radim Krčmář <rkrcmar@redhat.com> | 2018-03-06 18:40:43 +0100 |
| commit | 01643c51bfcf2460b530854046f62ce1b29713ab (patch) | |
| tree | e7cb32f011945beac52d9bb3c373b57c41a52b6f /virt | |
| parent | KVM: x86: add SYNC_REGS_SIZE_BYTES #define. (diff) | |
| download | linux-dev-01643c51bfcf2460b530854046f62ce1b29713ab.tar.xz linux-dev-01643c51bfcf2460b530854046f62ce1b29713ab.zip | |
KVM: x86: KVM_CAP_SYNC_REGS
This commit implements an enhanced x86 version of S390
KVM_CAP_SYNC_REGS functionality. KVM_CAP_SYNC_REGS "allow[s]
userspace to access certain guest registers without having
to call SET/GET_*REGS”. This reduces ioctl overhead which
is particularly important when userspace is making synchronous
guest state modifications (e.g. when emulating and/or intercepting
instructions).
Originally implemented upstream for the S390, the x86 differences
follow:
- userspace can select the register sets to be synchronized with kvm_run
using bit-flags in the kvm_valid_registers and kvm_dirty_registers
fields.
- vcpu_events is available in addition to the regs and sregs register
sets.
Signed-off-by: Ken Hofsass <hofsass@google.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
[Removed wrapper around check for reserved kvm_valid_regs. - Radim]
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Diffstat (limited to 'virt')
0 files changed, 0 insertions, 0 deletions