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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=57.103.84.229; envelope-from=mohamed@unpredictable.fr; helo=outbound.qs.icloud.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @unpredictable.fr) X-ZM-MESSAGEID: 1774305375038154100 Content-Type: text/plain; charset="utf-8" OS boot triggers a Cs segment limit assertion, while Hyper-V reports that Granularity =3D 0 despite the limit being 0xffffffff. Signed-off-by: Mohamed Mediouni --- target/i386/whpx/whpx-all.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/target/i386/whpx/whpx-all.c b/target/i386/whpx/whpx-all.c index f278a52451..d87afceb08 100644 --- a/target/i386/whpx/whpx-all.c +++ b/target/i386/whpx/whpx-all.c @@ -916,6 +916,25 @@ static void read_segment_descriptor(CPUState *cpu, WHV_X64_SEGMENT_REGISTER reg; whpx_read_segment_descriptor(cpu, ®, seg_idx); whpx_segment_to_x86_descriptor(cpu, ®, desc); + + /* + * Workaround: vcpu->exit_ctx.VpContext.Cs.Granularity is 0... + * + * OS boot triggers a Cs segment limit assertion, while + * Hyper-V reports that Granularity =3D 0 despite the + * limit being 0xffffffff. + * + * This particular issue is much easier to trigger with + * the instruction_stream logic disabled. With that enabled, + * plenty of guests boot just fine as they don't trigger the + * immediate in CS read from a trapped instruction case. + * + * However, 32-bit Linux on AMD triggers specifically in + * https://lore.kernel.org/20250422234830.2840784-6-superm1@kernel.org + */ + if (seg_idx =3D=3D R_CS) { + desc->g =3D 1; + } } =20 static bool is_protected_mode(CPUState *cpu) --=20 2.50.1 (Apple Git-155)