riscv: Enable cbo.zero only when all harts support Zicboz

Currently, we enable cbo.zero for usermode on each hart that supports
the Zicboz extension. This means that the [ms]envcfg CSR value may
differ between harts. Other features, such as pointer masking and CFI,
require setting [ms]envcfg bits on a per-thread basis. The combination
of these two adds quite some complexity and overhead to context
switching, as we would need to maintain two separate masks for the
per-hart and per-thread bits. Andrew Jones, who originally added Zicboz
support, writes[1][2]:

  I've approached Zicboz the same way I would approach all
  extensions, which is to be per-hart. I'm not currently aware of
  a platform that is / will be composed of harts where some have
  Zicboz and others don't, but there's nothing stopping a platform
  like that from being built.

  So, how about we add code that confirms Zicboz is on all harts.
  If any hart does not have it, then we complain loudly and disable
  it on all the other harts. If it was just a hardware description
  bug, then it'll get fixed. If there's actually a platform which
  doesn't have Zicboz on all harts, then, when the issue is reported,
  we can decide to not support it, support it with defconfig, or
  support it under a Kconfig guard which must be enabled by the user.

Let's follow his suggested solution and require the extension to be
available on all harts, so the envcfg CSR value does not need to change
when a thread migrates between harts. Since we are doing this for all
extensions with fields in envcfg, the CSR itself only needs to be saved/
restored when it is present on all harts.

This should not be a regression as no known hardware has asymmetric
Zicboz support, but if anyone reports seeing the warning, we will
re-evaluate our solution.

Link: https://lore.kernel.org/linux-riscv/20240322-168f191eeb8479b2ea169a5e@orel/ [1]
Link: https://lore.kernel.org/linux-riscv/20240323-28943722feb57a41fb0ff488@orel/ [2]
Reviewed-by: Andrew Jones <[email protected]>
Reviewed-by: Conor Dooley <[email protected]>
Reviewed-by: Deepak Gupta <[email protected]>
Signed-off-by: Samuel Holland <[email protected]>
Reviewed-by: Charlie Jenkins <[email protected]>
Tested-by: Charlie Jenkins <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Palmer Dabbelt <[email protected]>

Author: SiFiveHolland

arch/riscv/kernel/cpufeature.c

@@ -28,6 +28,8 @@
 
 #define NUM_ALPHA_EXTS ('z' - 'a' + 1)
 
+static bool any_cpu_has_zicboz;
+
 unsigned long elf_hwcap __read_mostly;
 
 /* Host ISA bitmap */
@@ -98,6 +100,7 @@ static int riscv_ext_zicboz_validate(const struct riscv_isa_ext_data *data,
 		pr_err("Zicboz disabled as cboz-block-size present, but is not a power-of-2\n");
 		return -EINVAL;
 	}
+	any_cpu_has_zicboz = true;
 	return 0;
 }
 
@@ -919,8 +922,10 @@ unsigned long riscv_get_elf_hwcap(void)
 
 void riscv_user_isa_enable(void)
 {
-	if (riscv_cpu_has_extension_unlikely(smp_processor_id(), RISCV_ISA_EXT_ZICBOZ))
+	if (riscv_has_extension_unlikely(RISCV_ISA_EXT_ZICBOZ))
 		csr_set(CSR_ENVCFG, ENVCFG_CBZE);
+	else if (any_cpu_has_zicboz)
+		pr_warn_once("Zicboz disabled as it is unavailable on some harts\n");
 }
 
 #ifdef CONFIG_RISCV_ALTERNATIVE

arch/riscv/kernel/suspend.c

@@ -14,7 +14,7 @@
 
 void suspend_save_csrs(struct suspend_context *context)
 {
-	if (riscv_cpu_has_extension_unlikely(smp_processor_id(), RISCV_ISA_EXT_XLINUXENVCFG))
+	if (riscv_has_extension_unlikely(RISCV_ISA_EXT_XLINUXENVCFG))
 		context->envcfg = csr_read(CSR_ENVCFG);
 	context->tvec = csr_read(CSR_TVEC);
 	context->ie = csr_read(CSR_IE);
@@ -37,7 +37,7 @@ void suspend_save_csrs(struct suspend_context *context)
 void suspend_restore_csrs(struct suspend_context *context)
 {
 	csr_write(CSR_SCRATCH, 0);
-	if (riscv_cpu_has_extension_unlikely(smp_processor_id(), RISCV_ISA_EXT_XLINUXENVCFG))
+	if (riscv_has_extension_unlikely(RISCV_ISA_EXT_XLINUXENVCFG))
 		csr_write(CSR_ENVCFG, context->envcfg);
 	csr_write(CSR_TVEC, context->tvec);
 	csr_write(CSR_IE, context->ie);