From 45adec566b073b39f4edfc1307843d12fe8105c8 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= Date: Tue, 31 Aug 2021 18:50:33 +0100 Subject: [PATCH 1/2] target/i386: add missing bits to CR4_RESERVED_MASK MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Booting Fedora kernels with -cpu max hangs very early in boot. Disabling the la57 CPUID bit fixes the problem. git bisect traced the regression to commit 213ff024a2f92020290296cb9dc29c2af3d4a221 (HEAD, refs/bisect/bad) Author: Lara Lazier Date: Wed Jul 21 17:26:50 2021 +0200 target/i386: Added consistency checks for CR4 All MBZ bits in CR4 must be zero. (APM2 15.5) Added reserved bitmask and added checks in both helper_vmrun and helper_write_crN. Signed-off-by: Lara Lazier Message-Id: <20210721152651.14683-2-laramglazier@gmail.com> Signed-off-by: Paolo Bonzini In this commit CR4_RESERVED_MASK is missing CR4_LA57_MASK and two others. Adding this lets Fedora kernels boot once again. Signed-off-by: Daniel P. Berrangé --- target/i386/cpu.h | 1 + 1 file changed, 1 insertion(+) diff --git a/target/i386/cpu.h b/target/i386/cpu.h index 6c50d3ab4f..ce85f1a29d 100644 --- a/target/i386/cpu.h +++ b/target/i386/cpu.h @@ -257,6 +257,7 @@ typedef enum X86Seg { | CR4_DE_MASK | CR4_PSE_MASK | CR4_PAE_MASK \ | CR4_MCE_MASK | CR4_PGE_MASK | CR4_PCE_MASK \ | CR4_OSFXSR_MASK | CR4_OSXMMEXCPT_MASK |CR4_UMIP_MASK \ + | CR4_LA57_MASK | CR4_VMXE_MASK | CR4_SMXE_MASK \ | CR4_FSGSBASE_MASK | CR4_PCIDE_MASK | CR4_OSXSAVE_MASK \ | CR4_SMEP_MASK | CR4_SMAP_MASK | CR4_PKE_MASK | CR4_PKS_MASK)) -- 2.32.0