From: Ashish Kalra Date: Tue, 6 May 2025 18:35:29 +0000 (+0000) Subject: x86/sev: Make sure pages are not skipped during kdump X-Git-Tag: v6.15-rc7~6^2~2 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=82b7f88f2316c5442708daeb0b5ec5aa54c8ff7f;p=thirdparty%2Flinux.git 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 Signed-off-by: Borislav Petkov (AMD) Reviewed-by: Tom Lendacky Tested-by: Srikanth Aithal Cc: stable@vger.kernel.org Link: https://lore.kernel.org/20250506183529.289549-1-Ashish.Kalra@amd.com --- diff --git a/arch/x86/coco/sev/core.c b/arch/x86/coco/sev/core.c index 41060ba41b5c4..36beaac713c12 100644 --- a/arch/x86/coco/sev/core.c +++ b/arch/x86/coco/sev/core.c @@ -1101,7 +1101,8 @@ static void unshare_all_memory(void) data = per_cpu(runtime_data, cpu); ghcb = (unsigned long)&data->ghcb_page; - if (addr <= ghcb && ghcb <= addr + size) { + /* Handle the case of a huge page containing the GHCB page */ + if (addr <= ghcb && ghcb < addr + size) { skipped_addr = true; break; } @@ -1213,8 +1214,8 @@ static void shutdown_all_aps(void) void snp_kexec_finish(void) { struct sev_es_runtime_data *data; + unsigned long size, addr; unsigned int level, cpu; - unsigned long size; struct ghcb *ghcb; pte_t *pte; @@ -1242,8 +1243,10 @@ void snp_kexec_finish(void) ghcb = &data->ghcb_page; pte = lookup_address((unsigned long)ghcb, &level); size = page_level_size(level); - set_pte_enc(pte, level, (void *)ghcb); - snp_set_memory_private((unsigned long)ghcb, (size / PAGE_SIZE)); + /* Handle the case of a huge page containing the GHCB page */ + addr = (unsigned long)ghcb & page_level_mask(level); + set_pte_enc(pte, level, (void *)addr); + snp_set_memory_private(addr, (size / PAGE_SIZE)); } }