github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-07-28 10:09:10 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

KVM: x86: Trace hypercall register *after* truncating values for 32-bit

Browse Source 
When tracing hypercalls, invoke the tracepoint *after* truncating the
register values for 32-bit guests so as not to record unused garbage (in
the extremely unlikely scenario that the guest left garbage in a register
after transitioning from 64-bit mode to 32-bit mode).

Fixes: 229456fc34 ("KVM: convert custom marker based tracing to event traces")
Reviewed-by: Yosry Ahmed <yosry@kernel.org>
Reviewed-by: Binbin Wu <binbin.wu@linux.intel.com>
Link: https://patch.msgid.link/20260529222223.870923-6-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson 2026-05-29 15:21:48 -07:00
parent f43caad54c
commit 16b5d193b2
1 changed files with 2 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/x86/kvm/x86.c
View File

@ -10433,8 +10433,6 @@ int ____kvm_emulate_hypercall(struct kvm_vcpu *vcpu, int cpl,
++vcpu->stat.hypercalls;
trace_kvm_hypercall(nr, a0, a1, a2, a3);
if (!op_64_bit) {
nr &= 0xFFFFFFFF;
a0 &= 0xFFFFFFFF;
@ -10443,6 +10441,8 @@ int ____kvm_emulate_hypercall(struct kvm_vcpu *vcpu, int cpl,
a3 &= 0xFFFFFFFF;
}
trace_kvm_hypercall(nr, a0, a1, a2, a3);
if (cpl) {
ret = -KVM_EPERM;
goto out;