Add Kazu and Dave in cc On 12/20/18 at 01:40pm, Lianbo Jiang wrote: > This patchset did two things: > a. add a new document for vmcoreinfo > > This document lists some variables that export to vmcoreinfo, and briefly > describles what these variables indicate. It should be instructive for > many people who do not know the vmcoreinfo, and it also normalizes the > exported variable as a convention between kernel and use-space. > > b. export the value of sme mask to vmcoreinfo > > For AMD machine with SME feature, makedumpfile tools need to know whether > the crash kernel was encrypted or not. If SME is enabled in the first > kernel, the crash kernel's page table(pgd/pud/pmd/pte) contains the > memory encryption mask, so need to remove the sme mask to obtain the true > physical address. > > Changes since v1: > 1. No need to export a kernel-internal mask to userspace, so copy the > value of sme_me_mask to a local variable 'sme_mask' and write the value > of sme_mask to vmcoreinfo. > 2. Add comment for the code. > 3. Improve the patch log. > 4. Add the vmcoreinfo documentation. > > Changes since v2: > 1. Improve the vmcoreinfo document, add more descripts for these > variables exported. > 2. Fix spelling errors in the document. > > Changes since v3: > 1. Still improve the vmcoreinfo document, and make it become more > clear and easy to read. > 2. Move sme_mask comments in the code to the vmcoreinfo document. > 3. Improve patch log. > > Lianbo Jiang (2): > kdump: add the vmcoreinfo documentation > kdump,vmcoreinfo: Export the value of sme mask to vmcoreinfo > > Documentation/kdump/vmcoreinfo.txt | 513 +++++++++++++++++++++++++++++ > arch/x86/kernel/machine_kexec_64.c | 3 + > 2 files changed, 516 insertions(+) > create mode 100644 Documentation/kdump/vmcoreinfo.txt > > -- > 2.17.1 >
