Merge tag 'pull-riscv-to-apply-20230224' of github.com:palmer-dabbelt/qemu into staging

Fourth RISC-V PR for QEMU 8.0, Attempt 2

* A triplet of cleanups to the kernel/initrd loader that avoids
  duplication between the various boards.
* Weiwei Li, Daniel Henrique Barboza, and Liu Zhiwei have been added as
  reviewers.  Thanks for the help!
* A fix for PMP matching to avoid incorrectly appling the default
  permissions on PMP permission violations.
* A cleanup to avoid an unnecessary avoid env_archcpu() in
  cpu_get_tb_cpu_state().
* Fixes for the vector slide instructions to avoid truncating 64-bit
  values (such as doubles) on 32-bit targets.

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# gpg: Signature made Fri 24 Feb 2023 18:49:35 GMT
# gpg:                using RSA key 2B3C3747446843B24A943A7A2E1319F35FBB1889
# gpg:                issuer "palmer@dabbelt.com"
# gpg: Good signature from "Palmer Dabbelt <palmer@dabbelt.com>" [unknown]
# gpg:                 aka "Palmer Dabbelt <palmerdabbelt@google.com>" [unknown]
# gpg: WARNING: This key is not certified with a trusted signature!
# gpg:          There is no indication that the signature belongs to the owner.
# Primary key fingerprint: 00CE 76D1 8349 60DF CE88  6DF8 EF4C A150 2CCB AB41
#      Subkey fingerprint: 2B3C 3747 4468 43B2 4A94  3A7A 2E13 19F3 5FBB 1889

* tag 'pull-riscv-to-apply-20230224' of github.com:palmer-dabbelt/qemu:
  target/riscv: Fix vslide1up.vf and vslide1down.vf
  target/riscv: avoid env_archcpu() in cpu_get_tb_cpu_state()
  target/riscv: Smepmp: Skip applying default rules when address matches
  MAINTAINERS: Add some RISC-V reviewers
  target/riscv: Remove privileged spec version restriction for RVV
  hw/riscv/boot.c: make riscv_load_initrd() static
  hw/riscv/boot.c: consolidate all kernel init in riscv_load_kernel()
  hw/riscv: handle 32 bit CPUs kernel_entry in riscv_load_kernel()

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

7 files changed, 76 insertions, 79 deletions

diff --git a/hw/riscv/boot.c b/hw/riscv/boot.c
index c7e0e50bd8..52bf8e67de 100644
--- a/hw/riscv/boot.c
+++ b/hw/riscv/boot.c
@@ -173,12 +173,55 @@ target_ulong riscv_load_firmware(const char *firmware_filename,
     exit(1);
 }
 
+static void riscv_load_initrd(MachineState *machine, uint64_t kernel_entry)
+{
+    const char *filename = machine->initrd_filename;
+    uint64_t mem_size = machine->ram_size;
+    void *fdt = machine->fdt;
+    hwaddr start, end;
+    ssize_t size;
+
+    g_assert(filename != NULL);
+
+    /*
+     * We want to put the initrd far enough into RAM that when the
+     * kernel is uncompressed it will not clobber the initrd. However
+     * on boards without much RAM we must ensure that we still leave
+     * enough room for a decent sized initrd, and on boards with large
+     * amounts of RAM we must avoid the initrd being so far up in RAM
+     * that it is outside lowmem and inaccessible to the kernel.
+     * So for boards with less  than 256MB of RAM we put the initrd
+     * halfway into RAM, and for boards with 256MB of RAM or more we put
+     * the initrd at 128MB.
+     */
+    start = kernel_entry + MIN(mem_size / 2, 128 * MiB);
+
+    size = load_ramdisk(filename, start, mem_size - start);
+    if (size == -1) {
+        size = load_image_targphys(filename, start, mem_size - start);
+        if (size == -1) {
+            error_report("could not load ramdisk '%s'", filename);
+            exit(1);
+        }
+    }
+
+    /* Some RISC-V machines (e.g. opentitan) don't have a fdt. */
+    if (fdt) {
+        end = start + size;
+        qemu_fdt_setprop_cell(fdt, "/chosen", "linux,initrd-start", start);
+        qemu_fdt_setprop_cell(fdt, "/chosen", "linux,initrd-end", end);
+    }
+}
+
 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);
 
@@ -192,61 +235,43 @@ target_ulong riscv_load_kernel(MachineState *machine,
     if (load_elf_ram_sym(kernel_filename, NULL, NULL, NULL,
                          NULL, &kernel_load_base, NULL, NULL, 0,
                          EM_RISCV, 1, 0, NULL, true, sym_cb) > 0) {
-        return kernel_load_base;
+        kernel_entry = kernel_load_base;
+        goto out;
     }
 
     if (load_uimage_as(kernel_filename, &kernel_entry, NULL, NULL,
                        NULL, NULL, NULL) > 0) {
-        return kernel_entry;
+        goto out;
     }
 
     if (load_image_targphys_as(kernel_filename, kernel_start_addr,
                                current_machine->ram_size, NULL) > 0) {
-        return kernel_start_addr;
+        kernel_entry = kernel_start_addr;
+        goto out;
     }
 
     error_report("could not load kernel '%s'", kernel_filename);
     exit(1);
-}
-
-void riscv_load_initrd(MachineState *machine, uint64_t kernel_entry)
-{
-    const char *filename = machine->initrd_filename;
-    uint64_t mem_size = machine->ram_size;
-    void *fdt = machine->fdt;
-    hwaddr start, end;
-    ssize_t size;
-
-    g_assert(filename != NULL);
 
+out:
     /*
-     * We want to put the initrd far enough into RAM that when the
-     * kernel is uncompressed it will not clobber the initrd. However
-     * on boards without much RAM we must ensure that we still leave
-     * enough room for a decent sized initrd, and on boards with large
-     * amounts of RAM we must avoid the initrd being so far up in RAM
-     * that it is outside lowmem and inaccessible to the kernel.
-     * So for boards with less  than 256MB of RAM we put the initrd
-     * halfway into RAM, and for boards with 256MB of RAM or more we put
-     * the initrd at 128MB.
+     * For 32 bit CPUs 'kernel_entry' can be sign-extended by
+     * load_elf_ram_sym().
      */
-    start = kernel_entry + MIN(mem_size / 2, 128 * MiB);
+    if (riscv_is_32bit(harts)) {
+        kernel_entry = extract64(kernel_entry, 0, 32);
+    }
 
-    size = load_ramdisk(filename, start, mem_size - start);
-    if (size == -1) {
-        size = load_image_targphys(filename, start, mem_size - start);
-        if (size == -1) {
-            error_report("could not load ramdisk '%s'", filename);
-            exit(1);
-        }
+    if (load_initrd && machine->initrd_filename) {
+        riscv_load_initrd(machine, kernel_entry);
     }
 
-    /* Some RISC-V machines (e.g. opentitan) don't have a fdt. */
-    if (fdt) {
-        end = start + size;
-        qemu_fdt_setprop_cell(fdt, "/chosen", "linux,initrd-start", start);
-        qemu_fdt_setprop_cell(fdt, "/chosen", "linux,initrd-end", end);
+    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 2b91e49561..e81bbd12df 100644
--- a/hw/riscv/microchip_pfsoc.c
+++ b/hw/riscv/microchip_pfsoc.c
@@ -629,16 +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);
-
-        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_entry = riscv_load_kernel(machine, &s->soc.u_cpus,
+                                         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 353f030d80..b06944d382 100644
--- a/hw/riscv/opentitan.c
+++ b/hw/riscv/opentitan.c
@@ -101,7 +101,9 @@ static void opentitan_board_init(MachineState *machine)
     }
 
     if (machine->kernel_filename) {
-        riscv_load_kernel(machine, memmap[IBEX_DEV_RAM].base, NULL);
+        riscv_load_kernel(machine, &s->soc.cpus,
+                          memmap[IBEX_DEV_RAM].base,
+                          false, NULL);
     }
 }
 
diff --git a/hw/riscv/sifive_e.c b/hw/riscv/sifive_e.c
index 3e3f4b0088..04939b60c3 100644
--- a/hw/riscv/sifive_e.c
+++ b/hw/riscv/sifive_e.c
@@ -114,7 +114,9 @@ static void sifive_e_machine_init(MachineState *machine)
                           memmap[SIFIVE_E_DEV_MROM].base, &address_space_memory);
 
     if (machine->kernel_filename) {
-        riscv_load_kernel(machine, memmap[SIFIVE_E_DEV_DTIM].base, NULL);
+        riscv_load_kernel(machine, &s->soc.cpus,
+                          memmap[SIFIVE_E_DEV_DTIM].base,
+                          false, NULL);
     }
 }
 
diff --git a/hw/riscv/sifive_u.c b/hw/riscv/sifive_u.c
index d3ab7a9cda..ad3bb35b34 100644
--- a/hw/riscv/sifive_u.c
+++ b/hw/riscv/sifive_u.c
@@ -598,16 +598,8 @@ static void sifive_u_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);
-
-        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_entry = riscv_load_kernel(machine, &s->soc.u_cpus,
+                                         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 cc3f6dac17..a584d5b3a2 100644
--- a/hw/riscv/spike.c
+++ b/hw/riscv/spike.c
@@ -305,17 +305,9 @@ static void spike_board_init(MachineState *machine)
         kernel_start_addr = riscv_calc_kernel_start_addr(&s->soc[0],
                                                          firmware_end_addr);
 
-        kernel_entry = riscv_load_kernel(machine, 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);
-        }
+        kernel_entry = riscv_load_kernel(machine, &s->soc[0],
+                                         kernel_start_addr,
+                                         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 b81081c70b..86c4adc0c9 100644
--- a/hw/riscv/virt.c
+++ b/hw/riscv/virt.c
@@ -1277,16 +1277,8 @@ static void virt_machine_done(Notifier *notifier, void *data)
         kernel_start_addr = riscv_calc_kernel_start_addr(&s->soc[0],
                                                          firmware_end_addr);
 
-        kernel_entry = riscv_load_kernel(machine, 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_entry = riscv_load_kernel(machine, &s->soc[0],
+                                         kernel_start_addr, true, NULL);
     } else {
        /*
         * If dynamic firmware is used, it doesn't know where is the next mode