Re: [kvm-unit-tests PATCH v6 1/8] lib: s390x: introduce bitfield for PSW mask

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On 9/4/23 10:22, Nico Boehr wrote:
Changing the PSW mask is currently little clumsy, since there is only the
PSW_MASK_* defines. This makes it hard to change e.g. only the address
space in the current PSW without a lot of bit fiddling.

Introduce a bitfield for the PSW mask. This makes this kind of
modifications much simpler and easier to read.

Signed-off-by: Nico Boehr <nrb@xxxxxxxxxxxxx>
---
  lib/s390x/asm/arch_def.h | 26 +++++++++++++++++++++++++-
  s390x/selftest.c         | 34 ++++++++++++++++++++++++++++++++++
  2 files changed, 59 insertions(+), 1 deletion(-)

diff --git a/lib/s390x/asm/arch_def.h b/lib/s390x/asm/arch_def.h
index bb26e008cc68..5a712f97f129 100644
--- a/lib/s390x/asm/arch_def.h
+++ b/lib/s390x/asm/arch_def.h
@@ -37,12 +37,36 @@ struct stack_frame_int {
  };
struct psw {
-	uint64_t	mask;
+	union {
+		uint64_t	mask;
+		struct {
+			uint64_t reserved00:1;
+			uint64_t per:1;
+			uint64_t reserved02:3;
+			uint64_t dat:1;
+			uint64_t io:1;
+			uint64_t ext:1;
+			uint64_t key:4;
+			uint64_t reserved12:1;
+			uint64_t mchk:1;
+			uint64_t wait:1;
+			uint64_t pstate:1;
+			uint64_t as:2;
+			uint64_t cc:2;
+			uint64_t prg_mask:4;
+			uint64_t reserved24:7;
+			uint64_t ea:1;
+			uint64_t ba:1;
+			uint64_t reserved33:31;
+		};
+	};
  	uint64_t	addr;
  };
+_Static_assert(sizeof(struct psw) == 16, "PSW size");
#define PSW(m, a) ((struct psw){ .mask = (m), .addr = (uint64_t)(a) }) +

We can fix this up when picking.

Other than that:
Reviewed-by: Janosch Frank <frankja@xxxxxxxxxxxxx>



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