KVM: x86/speculation: Disable Fill buffer clear within guests

[mirror_ubuntu-jammy-kernel.git] / arch / x86 / kvm / x86.c

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 39e641b87eed19c20f3e5a490aeafe7b4b141718..62298046ea34ad5ddd263d2ec88c47c2b7ea0a60 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1510,6 +1510,9 @@ static u64 kvm_get_arch_capabilities(void)
                 */
        }
 
+       /* Guests don't need to know "Fill buffer clear control" exists */
+       data &= ~ARCH_CAP_FB_CLEAR_CTRL;
+
        return data;
 }