From f64ee2f615f9d02bce647ce2255182a192cf67f6 Mon Sep 17 00:00:00 2001 From: Oleksii Kurochko Date: Wed, 6 Aug 2025 14:46:29 +0200 Subject: [PATCH] xen/riscv: implement sbi_remote_hfence_gvma() Instruct the remote harts to execute one or more HFENCE.GVMA instructions, covering the range of guest physical addresses between start_addr and start_addr + size for all VMIDs. The remote fence operation applies to the entire address space if either: - start_addr and size are both 0, or - size is equal to 2^XLEN-1. Signed-off-by: Oleksii Kurochko Acked-by: Jan Beulich --- xen/arch/riscv/include/asm/sbi.h | 19 +++++++++++++++++++ xen/arch/riscv/sbi.c | 7 +++++++ 2 files changed, 26 insertions(+) diff --git a/xen/arch/riscv/include/asm/sbi.h b/xen/arch/riscv/include/asm/sbi.h index 527d773277..560dca3be4 100644 --- a/xen/arch/riscv/include/asm/sbi.h +++ b/xen/arch/riscv/include/asm/sbi.h @@ -89,6 +89,25 @@ bool sbi_has_rfence(void); int sbi_remote_sfence_vma(const cpumask_t *cpu_mask, vaddr_t start, size_t size); +/* + * Instruct the remote harts to execute one or more HFENCE.GVMA + * instructions, covering the range of guest physical addresses + * in [start_addr, start_addr + size) for all VMIDs. + * + * Returns 0 if IPI was sent to all the targeted harts successfully + * or negative value if start_addr or size is not valid. + * + * The remote fence operation applies to the entire address space if either: + * - start_addr and size are both 0, or + * - size is equal to 2^XLEN-1. + * + * @cpu_mask a cpu mask containing all the target CPUs (in Xen space). + * @param start virtual address start + * @param size virtual address range size + */ +int sbi_remote_hfence_gvma(const cpumask_t *cpu_mask, vaddr_t start, + size_t size); + /* * Initialize SBI library * diff --git a/xen/arch/riscv/sbi.c b/xen/arch/riscv/sbi.c index 4209520389..1809f614c5 100644 --- a/xen/arch/riscv/sbi.c +++ b/xen/arch/riscv/sbi.c @@ -258,6 +258,13 @@ int sbi_remote_sfence_vma(const cpumask_t *cpu_mask, vaddr_t start, cpu_mask, start, size, 0, 0); } +int sbi_remote_hfence_gvma(const cpumask_t *cpu_mask, vaddr_t start, + size_t size) +{ + return sbi_rfence(SBI_EXT_RFENCE_REMOTE_HFENCE_GVMA, + cpu_mask, start, size, 0, 0); +} + /* This function must always succeed. */ #define sbi_get_spec_version() \ sbi_ext_base_func(SBI_EXT_BASE_GET_SPEC_VERSION)