From 62c5bc348e39f8b715fb2eac414749ee7e630043 Mon Sep 17 00:00:00 2001 From: Daniel Henrique Barboza Date: Mon, 6 Feb 2023 11:00:20 -0300 Subject: hw/riscv: handle 32 bit CPUs kernel_entry in riscv_load_kernel() MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Next patch will move all calls to riscv_load_initrd() to riscv_load_kernel(). Machines that want to load initrd will be able to do via an extra flag to riscv_load_kernel(). This change will expose a sign-extend behavior that is happening in load_elf_ram_sym() when running 32 bit guests [1]. This is currently obscured by the fact that riscv_load_initrd() is using the return of riscv_load_kernel(), defined as target_ulong, and this return type will crop the higher 32 bits that would be padded with 1s by the sign extension when running in 32 bit targets. The changes to be done will force riscv_load_initrd() to use an uint64_t instead, exposing it to the padding when dealing with 32 bit CPUs. There is a discussion about whether load_elf_ram_sym() should or should not sign extend the value returned by 'lowaddr'. What we can do is to prevent the behavior change that the next patch will end up doing. riscv_load_initrd() wasn't dealing with 64 bit kernel entries when running 32 bit CPUs, and we want to keep it that way. One way of doing it is to use target_ulong in 'kernel_entry' in riscv_load_kernel() and rely on the fact that this var will not be sign extended for 32 bit targets. Another way is to explictly clear the higher 32 bits when running 32 bit CPUs for all possibilities of kernel_entry. We opted for the later. This will allow us to be clear about the design choices made in the function, while also allowing us to add a small comment about what load_elf_ram_sym() is doing. With this change, the consolation patch can do its job without worrying about unintended behavioral changes. [1] https://lists.gnu.org/archive/html/qemu-devel/2023-01/msg02281.html Signed-off-by: Daniel Henrique Barboza Reviewed-by: Philippe Mathieu-Daudé Reviewed-by: Alistair Francis Message-Id: <20230206140022.2748401-2-dbarboza@ventanamicro.com> Signed-off-by: Alistair Francis Signed-off-by: Palmer Dabbelt --- hw/riscv/microchip_pfsoc.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'hw/riscv/microchip_pfsoc.c') diff --git a/hw/riscv/microchip_pfsoc.c b/hw/riscv/microchip_pfsoc.c index 2b91e49561..712625d2a4 100644 --- a/hw/riscv/microchip_pfsoc.c +++ b/hw/riscv/microchip_pfsoc.c @@ -629,7 +629,8 @@ static void microchip_icicle_kit_machine_init(MachineState *machine) kernel_start_addr = riscv_calc_kernel_start_addr(&s->soc.u_cpus, firmware_end_addr); - kernel_entry = riscv_load_kernel(machine, kernel_start_addr, NULL); + kernel_entry = riscv_load_kernel(machine, &s->soc.u_cpus, + kernel_start_addr, NULL); if (machine->initrd_filename) { riscv_load_initrd(machine, kernel_entry); -- cgit 1.4.1 From 487d73fc470d233f2d5da9cec7cd229ae8b88b49 Mon Sep 17 00:00:00 2001 From: Daniel Henrique Barboza Date: Mon, 6 Feb 2023 11:00:21 -0300 Subject: hw/riscv/boot.c: consolidate all kernel init in riscv_load_kernel() MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The microchip_icicle_kit, sifive_u, spike and virt boards are now doing the same steps when '-kernel' is used: - execute load_kernel() - load init_rd() - write kernel_cmdline Let's fold everything inside riscv_load_kernel() to avoid code repetition. To not change the behavior of boards that aren't calling riscv_load_init(), add an 'load_initrd' flag to riscv_load_kernel() and allow these boards to opt out from initrd loading. Cc: Palmer Dabbelt Reviewed-by: Bin Meng Reviewed-by: Alistair Francis Signed-off-by: Daniel Henrique Barboza Reviewed-by: Philippe Mathieu-Daudé Message-Id: <20230206140022.2748401-3-dbarboza@ventanamicro.com> Signed-off-by: Alistair Francis Signed-off-by: Palmer Dabbelt --- hw/riscv/boot.c | 11 +++++++++++ hw/riscv/microchip_pfsoc.c | 11 +---------- hw/riscv/opentitan.c | 3 ++- hw/riscv/sifive_e.c | 3 ++- hw/riscv/sifive_u.c | 11 +---------- hw/riscv/spike.c | 11 +---------- hw/riscv/virt.c | 11 +---------- include/hw/riscv/boot.h | 1 + 8 files changed, 20 insertions(+), 42 deletions(-) (limited to 'hw/riscv/microchip_pfsoc.c') diff --git a/hw/riscv/boot.c b/hw/riscv/boot.c index df6b4a1fba..4954bb9d4b 100644 --- a/hw/riscv/boot.c +++ b/hw/riscv/boot.c @@ -176,10 +176,12 @@ target_ulong riscv_load_firmware(const char *firmware_filename, target_ulong riscv_load_kernel(MachineState *machine, RISCVHartArrayState *harts, target_ulong kernel_start_addr, + bool load_initrd, symbol_fn_t sym_cb) { const char *kernel_filename = machine->kernel_filename; uint64_t kernel_load_base, kernel_entry; + void *fdt = machine->fdt; g_assert(kernel_filename != NULL); @@ -220,6 +222,15 @@ out: kernel_entry = extract64(kernel_entry, 0, 32); } + if (load_initrd && machine->initrd_filename) { + riscv_load_initrd(machine, kernel_entry); + } + + if (fdt && machine->kernel_cmdline && *machine->kernel_cmdline) { + qemu_fdt_setprop_string(fdt, "/chosen", "bootargs", + machine->kernel_cmdline); + } + return kernel_entry; } diff --git a/hw/riscv/microchip_pfsoc.c b/hw/riscv/microchip_pfsoc.c index 712625d2a4..e81bbd12df 100644 --- a/hw/riscv/microchip_pfsoc.c +++ b/hw/riscv/microchip_pfsoc.c @@ -630,16 +630,7 @@ static void microchip_icicle_kit_machine_init(MachineState *machine) firmware_end_addr); kernel_entry = riscv_load_kernel(machine, &s->soc.u_cpus, - kernel_start_addr, NULL); - - if (machine->initrd_filename) { - riscv_load_initrd(machine, kernel_entry); - } - - if (machine->kernel_cmdline && *machine->kernel_cmdline) { - qemu_fdt_setprop_string(machine->fdt, "/chosen", - "bootargs", machine->kernel_cmdline); - } + kernel_start_addr, true, NULL); /* Compute the fdt load address in dram */ fdt_load_addr = riscv_compute_fdt_addr(memmap[MICROCHIP_PFSOC_DRAM_LO].base, diff --git a/hw/riscv/opentitan.c b/hw/riscv/opentitan.c index 7fe4fb5628..b06944d382 100644 --- a/hw/riscv/opentitan.c +++ b/hw/riscv/opentitan.c @@ -102,7 +102,8 @@ static void opentitan_board_init(MachineState *machine) if (machine->kernel_filename) { riscv_load_kernel(machine, &s->soc.cpus, - memmap[IBEX_DEV_RAM].base, NULL); + memmap[IBEX_DEV_RAM].base, + false, NULL); } } diff --git a/hw/riscv/sifive_e.c b/hw/riscv/sifive_e.c index 1a7d381514..04939b60c3 100644 --- a/hw/riscv/sifive_e.c +++ b/hw/riscv/sifive_e.c @@ -115,7 +115,8 @@ static void sifive_e_machine_init(MachineState *machine) if (machine->kernel_filename) { riscv_load_kernel(machine, &s->soc.cpus, - memmap[SIFIVE_E_DEV_DTIM].base, NULL); + memmap[SIFIVE_E_DEV_DTIM].base, + false, NULL); } } diff --git a/hw/riscv/sifive_u.c b/hw/riscv/sifive_u.c index 71be442a50..ad3bb35b34 100644 --- a/hw/riscv/sifive_u.c +++ b/hw/riscv/sifive_u.c @@ -599,16 +599,7 @@ static void sifive_u_machine_init(MachineState *machine) firmware_end_addr); kernel_entry = riscv_load_kernel(machine, &s->soc.u_cpus, - kernel_start_addr, NULL); - - if (machine->initrd_filename) { - riscv_load_initrd(machine, kernel_entry); - } - - if (machine->kernel_cmdline && *machine->kernel_cmdline) { - qemu_fdt_setprop_string(machine->fdt, "/chosen", "bootargs", - machine->kernel_cmdline); - } + kernel_start_addr, true, NULL); } else { /* * If dynamic firmware is used, it doesn't know where is the next mode diff --git a/hw/riscv/spike.c b/hw/riscv/spike.c index 1fa91167ab..a584d5b3a2 100644 --- a/hw/riscv/spike.c +++ b/hw/riscv/spike.c @@ -307,16 +307,7 @@ static void spike_board_init(MachineState *machine) kernel_entry = riscv_load_kernel(machine, &s->soc[0], kernel_start_addr, - htif_symbol_callback); - - if (machine->initrd_filename) { - riscv_load_initrd(machine, kernel_entry); - } - - if (machine->kernel_cmdline && *machine->kernel_cmdline) { - qemu_fdt_setprop_string(machine->fdt, "/chosen", "bootargs", - machine->kernel_cmdline); - } + true, htif_symbol_callback); } else { /* * If dynamic firmware is used, it doesn't know where is the next mode diff --git a/hw/riscv/virt.c b/hw/riscv/virt.c index 797c6084b6..86c4adc0c9 100644 --- a/hw/riscv/virt.c +++ b/hw/riscv/virt.c @@ -1278,16 +1278,7 @@ static void virt_machine_done(Notifier *notifier, void *data) firmware_end_addr); kernel_entry = riscv_load_kernel(machine, &s->soc[0], - kernel_start_addr, NULL); - - if (machine->initrd_filename) { - riscv_load_initrd(machine, kernel_entry); - } - - if (machine->kernel_cmdline && *machine->kernel_cmdline) { - qemu_fdt_setprop_string(machine->fdt, "/chosen", "bootargs", - machine->kernel_cmdline); - } + kernel_start_addr, true, NULL); } else { /* * If dynamic firmware is used, it doesn't know where is the next mode diff --git a/include/hw/riscv/boot.h b/include/hw/riscv/boot.h index 6295316afb..ea1de8b020 100644 --- a/include/hw/riscv/boot.h +++ b/include/hw/riscv/boot.h @@ -46,6 +46,7 @@ target_ulong riscv_load_firmware(const char *firmware_filename, target_ulong riscv_load_kernel(MachineState *machine, RISCVHartArrayState *harts, target_ulong firmware_end_addr, + bool load_initrd, symbol_fn_t sym_cb); void riscv_load_initrd(MachineState *machine, uint64_t kernel_entry); uint64_t riscv_compute_fdt_addr(hwaddr dram_start, uint64_t dram_size, -- cgit 1.4.1