Commit 46fac17d authored by Viktor Prutyanov's avatar Viktor Prutyanov Committed by Paolo Bonzini
Browse files

dump: add kernel_gs_base to QEMU CPU state 



This patch adds field with content of KERNEL_GS_BASE MSR to QEMU note in
ELF dump.

On Windows, if all vCPUs are running usermode tasks at the time the dump is
created, this can be helpful in the discovery of guest system structures
during conversion ELF dump to MEMORY.DMP dump.

Signed-off-by: default avatarViktor Prutyanov <viktor.prutyanov@virtuozzo.com>
Message-Id: <20180714123000.11326-1-viktor.prutyanov@virtuozzo.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 9277d81f

target/i386/arch_dump.c

+10 −0
Original line number Diff line number Diff line
@@ -258,6 +258,12 @@ struct QEMUCPUState { 
    QEMUCPUSegment cs, ds, es, fs, gs, ss;

    QEMUCPUSegment ldt, tr, gdt, idt;

    uint64_t cr[5];

    /*

     * Fields below are optional and are being added at the end without

     * changing the version. External tools may identify their presence

     * by checking 'size' field.

     */

    uint64_t kernel_gs_base;

};



typedef struct QEMUCPUState QEMUCPUState;
@@ -315,6 +321,10 @@ static void qemu_get_cpustate(QEMUCPUState *s, CPUX86State *env) 
    s->cr[2] = env->cr[2];

    s->cr[3] = env->cr[3];

    s->cr[4] = env->cr[4];



#ifdef TARGET_X86_64

    s->kernel_gs_base = env->kernelgsbase;

#endif

}



static inline int cpu_write_qemu_note(WriteCoreDumpFunction f,