[qemu-xen stable-4.18] hw/char/riscv_htif: Fix the console syscall on big endian hosts

[patchbot@xxxxxxx]

commit a57e4cc6fe81a0b2ca8a32db91ca45df205c4a8f
Author:     Thomas Huth <thuth@xxxxxxxxxx>
AuthorDate: Fri Jul 21 11:47:20 2023 +0200
Commit:     Michael Tokarev <mjt@xxxxxxxxxx>
CommitDate: Wed Sep 20 10:18:14 2023 +0300

    hw/char/riscv_htif: Fix the console syscall on big endian hosts
    
    Values that have been read via cpu_physical_memory_read() from the
    guest's memory have to be swapped in case the host endianess differs
    from the guest.
    
    Fixes: a6e13e31d5 ("riscv_htif: Support console output via proxy syscall")
    Signed-off-by: Thomas Huth <thuth@xxxxxxxxxx>
    Reviewed-by: Alistair Francis <alistair.francis@xxxxxxx>
    Reviewed-by: Bin Meng <bmeng@xxxxxxxxxxx>
    Reviewed-by: Daniel Henrique Barboza <dbarboza@xxxxxxxxxxxxxxxx>
    Message-Id: <20230721094720.902454-3-thuth@xxxxxxxxxx>
    Signed-off-by: Alistair Francis <alistair.francis@xxxxxxx>
    (cherry picked from commit 058096f1c55ab688db7e1d6814aaefc1bcd87f7a)
    Signed-off-by: Michael Tokarev <mjt@xxxxxxxxxx>
    (Mjt: context fix in hw/char/riscv_htif.c for #include)
---
 hw/char/riscv_htif.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/hw/char/riscv_htif.c b/hw/char/riscv_htif.c
index e6e0fa3015..198175e232 100644
--- a/hw/char/riscv_htif.c
+++ b/hw/char/riscv_htif.c
@@ -29,6 +29,7 @@
 #include "chardev/char-fe.h"
 #include "qemu/timer.h"
 #include "qemu/error-report.h"
+#include "exec/tswap.h"
 
 #define RISCV_DEBUG_HTIF 0
 #define HTIF_DEBUG(fmt, ...)                                                   
\
@@ -167,11 +168,11 @@ static void htif_handle_tohost_write(HTIFState *s, 
uint64_t val_written)
             } else {
                 uint64_t syscall[8];
                 cpu_physical_memory_read(payload, syscall, sizeof(syscall));
-                if (syscall[0] == PK_SYS_WRITE &&
-                    syscall[1] == HTIF_DEV_CONSOLE &&
-                    syscall[3] == HTIF_CONSOLE_CMD_PUTC) {
+                if (tswap64(syscall[0]) == PK_SYS_WRITE &&
+                    tswap64(syscall[1]) == HTIF_DEV_CONSOLE &&
+                    tswap64(syscall[3]) == HTIF_CONSOLE_CMD_PUTC) {
                     uint8_t ch;
-                    cpu_physical_memory_read(syscall[2], &ch, 1);
+                    cpu_physical_memory_read(tswap64(syscall[2]), &ch, 1);
                     qemu_chr_fe_write(&s->chr, &ch, 1);
                     resp = 0x100 | (uint8_t)payload;
                 } else {
--
generated by git-patchbot for /home/xen/git/qemu-xen.git#stable-4.18