[xen master] xen/riscv: introduce flushtlb.h

[patchbot@xxxxxxx]

commit 05ff18b4f0fd3586a305971d46b243da92d63569
Author:     Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
AuthorDate: Mon Feb 5 16:32:17 2024 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Feb 13 09:30:42 2024 +0100

    xen/riscv: introduce flushtlb.h
    
    Signed-off-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
    Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/arch/riscv/include/asm/flushtlb.h | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/xen/arch/riscv/include/asm/flushtlb.h 
b/xen/arch/riscv/include/asm/flushtlb.h
new file mode 100644
index 0000000000..7ce32bea0b
--- /dev/null
+++ b/xen/arch/riscv/include/asm/flushtlb.h
@@ -0,0 +1,34 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef __ASM_RISCV_FLUSHTLB_H__
+#define __ASM_RISCV_FLUSHTLB_H__
+
+#include <xen/bug.h>
+#include <xen/cpumask.h>
+
+/*
+ * Filter the given set of CPUs, removing those that definitely flushed their
+ * TLB since @page_timestamp.
+ */
+/* XXX lazy implementation just doesn't clear anything.... */
+static inline void tlbflush_filter(cpumask_t *mask, uint32_t page_timestamp) {}
+
+#define tlbflush_current_time() (0)
+
+static inline void page_set_tlbflush_timestamp(struct page_info *page)
+{
+    BUG_ON("unimplemented");
+}
+
+/* Flush specified CPUs' TLBs */
+void arch_flush_tlb_mask(const cpumask_t *mask);
+
+#endif /* __ASM_RISCV_FLUSHTLB_H__ */
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
--
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