KVM: nSVM: Sync NextRIP to cached vmcb12 after VMRUN of L2

After VMRUN in guest mode, nested_sync_control_from_vmcb02() syncs
fields written by the CPU from vmcb02 to the cached vmcb12. This is
because the cached vmcb12 is used as the authoritative copy of some of
the controls, and is the payload when saving/restoring nested state.

NextRIP is also written by the CPU (in some cases) after VMRUN, but is
not sync'd to the cached vmcb12. As a result, it is corrupted after
save/restore (replaced by the original value written by L1 on nested
VMRUN). This could cause problems for both KVM (e.g. when injecting a
soft IRQ) or L1 (e.g. when using NextRIP to advance RIP after emulating
an instruction).

Fix this by sync'ing NextRIP to the cache after VMRUN of L2, but only
after completing interrupts (not in nested_sync_control_from_vmcb02()),
as KVM may update NextRIP (e.g. when re-injecting a soft IRQ).

Fixes: cc440cdad5b7 ("KVM: nSVM: implement KVM_GET_NESTED_STATE and KVM_SET_NESTED_STATE")
CC: stable@vger.kernel.org
Co-developed-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Yosry Ahmed <yosry@kernel.org>
Link: https://patch.msgid.link/20260225005950.3739782-2-yosry@kernel.org
Signed-off-by: Sean Christopherson <seanjc@google.com>

0 files changed, 0 insertions, 0 deletions