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Wed, 23 Apr 2025 04:10:45 -0700 (PDT) Date: Wed, 23 Apr 2025 13:09:54 +0200 In-Reply-To: <20250423110948.1103030-13-ardb+git@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250423110948.1103030-13-ardb+git@google.com> X-Developer-Key: i=ardb@kernel.org; a=openpgp; fpr=F43D03328115A198C90016883D200E9CA6329909 X-Developer-Signature: v=1; a=openpgp-sha256; l=817; i=ardb@kernel.org; h=from:subject; bh=gr1xEJNEV0/G705MfiH6XFvAxAGrVlSXWj5oMivvbko=; b=owGbwMvMwCFmkMcZplerG8N4Wi2JIYPj1MSYzaq8bAvjXRmYvxjVT/56yl2u9Jbwh5sbjtelH M5ZmGbRUcrCIMbBICumyCIw+++7nacnStU6z5KFmcPKBDKEgYtTACYit4SR4eOBbQznXtnqriye sCdmakdI+3OF8H1Zd3JOPtv/+vxLZieG/wn6OxJbCuUOKBgGpHuzWTd6NjRJWC7aIdqRwv/oSGM WAwA= X-Mailer: git-send-email 2.49.0.805.g082f7c87e0-goog Message-ID: <20250423110948.1103030-18-ardb+git@google.com> Subject: [RFC PATCH PoC 05/11] HACK: provide __pti_set_user_pgtbl() to startup code From: Ard Biesheuvel To: linux-kernel@vger.kernel.org Cc: x86@kernel.org, mingo@kernel.org, Ard Biesheuvel Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Ard Biesheuvel The SME startup code may call out to pti_set_user_pgtbl(), which is not part of the code corpus that is explicitly built to tolerate execution from the 1:1 mapping of memory. Hack around this for now by providing an alternative that just returns the pgd. Signed-off-by: Ard Biesheuvel --- arch/x86/boot/startup/sme.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/x86/boot/startup/sme.c b/arch/x86/boot/startup/sme.c index 5738b31c8e60..d55b24cd4d08 100644 --- a/arch/x86/boot/startup/sme.c +++ b/arch/x86/boot/startup/sme.c @@ -564,3 +564,8 @@ void __head sme_enable(struct boot_params *bp) cc_vendor =3D CC_VENDOR_AMD; cc_set_mask(me_mask); } + +pgd_t __pti_set_user_pgtbl(pgd_t *pgdp, pgd_t pgd) +{ + return pgd; +} --=20 2.49.0.805.g082f7c87e0-goog