Commit b240697863 for qemu.org

commit b2406978634c45377c4ca1bc36741b7c0bb4d76a
Author: Mohamed Mediouni <mohamed@unpredictable.fr>
Date:   Wed Apr 22 23:42:07 2026 +0200

    whpx: i386: tighten APIC base validity check

    Signed-off-by: Mohamed Mediouni <mohamed@unpredictable.fr>
    Link: https://lore.kernel.org/r/20260422214225.2242-20-mohamed@unpredictable.fr
    Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/target/i386/whpx/whpx-all.c b/target/i386/whpx/whpx-all.c
index 4bb99a8e90..8fbce41590 100644
--- a/target/i386/whpx/whpx-all.c
+++ b/target/i386/whpx/whpx-all.c
@@ -2079,6 +2079,10 @@ int whpx_vcpu_run(CPUState *cpu)

             if (vcpu->exit_ctx.MsrAccess.MsrNumber == MSR_IA32_APICBASE) {
                 is_known_msr = 1;
+                if (val & MSR_IA32_APICBASE_RESERVED) {
+                    x86_emul_raise_exception(&X86_CPU(cpu)->env, EXCP0D_GPF, 0);
+                    raises_gpf = true;
+                }
                 if (!vcpu->exit_ctx.MsrAccess.AccessInfo.IsWrite) {
                     /* Read path unreachable on Hyper-V */
                     abort();