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JIRA: https://issues.redhat.com/browse/RHEL-10019 commit 82b7f88f2316c5442708daeb0b5ec5aa54c8ff7f Author: Ashish Kalra <ashish.kalra@amd.com> Date: Tue May 6 18:35:29 2025 +0000 x86/sev: Make sure pages are not skipped during kdump When shared pages are being converted to private during kdump, additional checks are performed. They include handling the case of a GHCB page being contained within a huge page. Currently, this check incorrectly skips a page just below the GHCB page from being transitioned back to private during kdump preparation. This skipped page causes a 0x404 #VC exception when it is accessed later while dumping guest memory for vmcore generation. Correct the range to be checked for GHCB contained in a huge page. Also, ensure that the skipped huge page containing the GHCB page is transitioned back to private by applying the correct address mask later when changing GHCBs to private at end of kdump preparation. [ bp: Massage commit message. ] Fixes: 3074152e56c9 ("x86/sev: Convert shared memory back to private on kexec") Signed-off-by: Ashish Kalra <ashish.kalra@amd.com> Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com> Tested-by: Srikanth Aithal <sraithal@amd.com> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/20250506183529.289549-1-Ashish.Kalra@amd.com Signed-off-by: Bandan Das <bsd@redhat.com> |
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