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b=owGbwMvMwCFmkMcZplerG8N4Wi2JIZ1t5azmxVvPswZHXo+eZV99ILxaoHCZkO2ShWG1fzZfj dj+ce7DjlIWBjEOBlkxRRaB2X/f7Tw9UarWeZYszBxWJpAhDFycAjARy+2MDA/ZrgbNPbtsYlDP rOq9G7Q6V597L3Jqq9sCbs3/wpEGh5MYGb78MV6wNolJSO21T0+OoIGEyFzrXQ6zdnhMFmFb/nZ dCgcA X-Mailer: git-send-email 2.47.0.rc0.187.ge670bccf7e-goog Message-ID: <20241009160438.3884381-9-ardb+git@google.com> Subject: [PATCH v3 2/5] x86/pvh: Use correct size value in GDT descriptor From: Ard Biesheuvel To: linux-kernel@vger.kernel.org Cc: Ard Biesheuvel , Jason Andryuk , Juergen Gross , Boris Ostrovsky , x86@kernel.org, xen-devel@lists.xenproject.org From: Ard Biesheuvel The limit field in a GDT descriptor is an inclusive bound, and therefore one less than the size of the covered range. Reviewed-by: Jason Andryuk Tested-by: Jason Andryuk Signed-off-by: Ard Biesheuvel --- arch/x86/platform/pvh/head.S | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/platform/pvh/head.S b/arch/x86/platform/pvh/head.S index ce4fd8d33da4..5a196fb3ebd8 100644 --- a/arch/x86/platform/pvh/head.S +++ b/arch/x86/platform/pvh/head.S @@ -224,7 +224,7 @@ SYM_CODE_END(pvh_start_xen) .section ".init.data","aw" .balign 8 SYM_DATA_START_LOCAL(gdt) - .word gdt_end - gdt_start + .word gdt_end - gdt_start - 1 .long _pa(gdt_start) /* x86-64 will overwrite if relocated. */ .word 0 SYM_DATA_END(gdt)