diff options
| author | Juergen Gross <[email protected]> | 2024-10-17 15:27:31 +0200 |
|---|---|---|
| committer | Juergen Gross <[email protected]> | 2024-12-17 08:23:42 +0100 |
| commit | 7fa0da5373685e7ed249af3fa317ab1e1ba8b0a6 (patch) | |
| tree | fd857217441f169e495b8f32663340f0341ff134 /arch/x86/xen/enlighten_hvm.c | |
| parent | b1c2cb86f4a7861480ad54bb9a58df3cbebf8e92 (diff) | |
x86/xen: remove hypercall page
The hypercall page is no longer needed. It can be removed, as from the
Xen perspective it is optional.
But, from Linux's perspective, it removes naked RET instructions that
escape the speculative protections that Call Depth Tracking and/or
Untrain Ret are trying to achieve.
This is part of XSA-466 / CVE-2024-53241.
Reported-by: Andrew Cooper <[email protected]>
Signed-off-by: Juergen Gross <[email protected]>
Reviewed-by: Andrew Cooper <[email protected]>
Reviewed-by: Jan Beulich <[email protected]>
Diffstat (limited to 'arch/x86/xen/enlighten_hvm.c')
| -rw-r--r-- | arch/x86/xen/enlighten_hvm.c | 9 |
1 files changed, 1 insertions, 8 deletions
diff --git a/arch/x86/xen/enlighten_hvm.c b/arch/x86/xen/enlighten_hvm.c index 973a74fc966a..fe57ff85d004 100644 --- a/arch/x86/xen/enlighten_hvm.c +++ b/arch/x86/xen/enlighten_hvm.c @@ -106,15 +106,8 @@ static void __init init_hvm_pv_info(void) /* PVH set up hypercall page in xen_prepare_pvh(). */ if (xen_pvh_domain()) pv_info.name = "Xen PVH"; - else { - u64 pfn; - uint32_t msr; - + else pv_info.name = "Xen HVM"; - msr = cpuid_ebx(base + 2); - pfn = __pa(hypercall_page); - wrmsr_safe(msr, (u32)pfn, (u32)(pfn >> 32)); - } xen_setup_features(); |