diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2018-05-11 12:30:34 -0700 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-05-11 12:30:34 -0700 |
commit | 84c3a0979c4c29711807747280dfecbb54b8af7c (patch) | |
tree | 1df3ac089378c58fa97e24532680c7795e8ba379 /arch/x86 | |
parent | be83bbf806822b1b89e0a0f23cd87cddc409e429 (diff) | |
parent | d1ecfa9d1f402366b1776fbf84e635678a51414f (diff) | |
download | op-kernel-dev-84c3a0979c4c29711807747280dfecbb54b8af7c.zip op-kernel-dev-84c3a0979c4c29711807747280dfecbb54b8af7c.tar.gz |
Merge tag 'for-linus-4.17-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip
Pull xen fix from Juergen Gross:
"One fix for the kernel running as a fully virtualized guest using PV
drivers on old Xen hypervisor versions"
* tag 'for-linus-4.17-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
x86/xen: Reset VCPU0 info pointer after shared_info remap
Diffstat (limited to 'arch/x86')
-rw-r--r-- | arch/x86/xen/enlighten_hvm.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/x86/xen/enlighten_hvm.c b/arch/x86/xen/enlighten_hvm.c index 8268987..19c1ff5 100644 --- a/arch/x86/xen/enlighten_hvm.c +++ b/arch/x86/xen/enlighten_hvm.c @@ -65,6 +65,19 @@ static void __init xen_hvm_init_mem_mapping(void) { early_memunmap(HYPERVISOR_shared_info, PAGE_SIZE); HYPERVISOR_shared_info = __va(PFN_PHYS(shared_info_pfn)); + + /* + * The virtual address of the shared_info page has changed, so + * the vcpu_info pointer for VCPU 0 is now stale. + * + * The prepare_boot_cpu callback will re-initialize it via + * xen_vcpu_setup, but we can't rely on that to be called for + * old Xen versions (xen_have_vector_callback == 0). + * + * It is, in any case, bad to have a stale vcpu_info pointer + * so reset it now. + */ + xen_vcpu_info_reset(0); } static void __init init_hvm_pv_info(void) |