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X-Received-From: 2607:f8b0:4864:20::434 Subject: [Qemu-devel] [PATCH v3 22/23] target/ppc: Use qemu_guest_getrandom for DARN X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: qemu-ppc@nongnu.org, David Gibson Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" We now have an interface for guest visible random numbers. Cc: qemu-ppc@nongnu.org Cc: David Gibson Signed-off-by: Richard Henderson Acked-by: David Gibson --- target/ppc/int_helper.c | 38 +++++++++++++++++++++++++++----------- 1 file changed, 27 insertions(+), 11 deletions(-) diff --git a/target/ppc/int_helper.c b/target/ppc/int_helper.c index 162add561e..c26531e598 100644 --- a/target/ppc/int_helper.c +++ b/target/ppc/int_helper.c @@ -23,6 +23,8 @@ #include "exec/helper-proto.h" #include "crypto/aes.h" #include "fpu/softfloat.h" +#include "qapi/error.h" +#include "qemu/guest-random.h" =20 #include "helper_regs.h" /*************************************************************************= ****/ @@ -156,25 +158,39 @@ uint32_t helper_cmpeqb(target_ulong ra, target_ulong = rb) #undef haszero #undef hasvalue =20 -/* Return invalid random number. - * - * FIXME: Add rng backend or other mechanism to get cryptographically suit= able - * random number - */ target_ulong helper_darn32(void) { - return -1; + Error *err =3D NULL; + uint32_t ret; + + if (qemu_guest_getrandom(&ret, 4, &err) < 0) { + qemu_log_mask(LOG_UNIMP, "darn: Crypto failure: %s", + error_get_pretty(err)); + error_free(err); + return -1; + } + + return ret; } =20 target_ulong helper_darn64(void) { - return -1; + Error *err =3D NULL; + uint64_t ret; + + do { + if (qemu_guest_getrandom(&ret, 8, &err) < 0) { + qemu_log_mask(LOG_UNIMP, "darn: Crypto failure: %s", + error_get_pretty(err)); + error_free(err); + return -1; + } + /* Since -1 is the error condition, try again for that case. */ + } while (unlikely(ret =3D=3D -1)); + + return ret; } =20 -#endif - -#if defined(TARGET_PPC64) - uint64_t helper_bpermd(uint64_t rs, uint64_t rb) { int i; --=20 2.17.2