It instructs the remote harts to execute one or more HFENCE.GVMA instructions
by making an SBI call, covering the range of guest physical addresses between
start_addr and start_addr + size only for the given VMID.
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 <oleksii.kuroc...@gmail.com>
---
Changes in V3:
- Drop ASSERT() in sbi_remote_hfence_gvma_vmid() as failure will happen anyway
if
rfence isn't initialized.
- Drop "This function call is only valid for harts implementing hypervisor
extension." from the commit message and the comment above the declaration
of sbi_remote_hfence_gvma_vmid().
- Use proper FID for sbi_remote_hfence_gvma_vmid().
---
Changes in V2:
- New patch.
---
xen/arch/riscv/include/asm/sbi.h | 13 +++++++++++++
xen/arch/riscv/sbi.c | 7 +++++++
2 files changed, 20 insertions(+)
diff --git a/xen/arch/riscv/include/asm/sbi.h b/xen/arch/riscv/include/asm/sbi.h
index 0277aab747..10930dea93 100644
--- a/xen/arch/riscv/include/asm/sbi.h
+++ b/xen/arch/riscv/include/asm/sbi.h
@@ -108,6 +108,19 @@ int sbi_remote_sfence_vma(const cpumask_t *cpu_mask,
vaddr_t start,
int sbi_remote_hfence_gvma(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 between start_addr and
+ * start_addr + size only for the given VMID.
+ *
+ * @cpu_mask a cpu mask containing all the target CPUs (in Xen space).
+ * @param start virtual address start
+ * @param size virtual address range size
+ * @param vmid virtual machine id
+ */
+int sbi_remote_hfence_gvma_vmid(const cpumask_t *cpu_mask, vaddr_t start,
+ size_t size, unsigned long vmid);
+
/*
* Initialize SBI library
*
diff --git a/xen/arch/riscv/sbi.c b/xen/arch/riscv/sbi.c
index 1809f614c5..425dce44c6 100644
--- a/xen/arch/riscv/sbi.c
+++ b/xen/arch/riscv/sbi.c
@@ -265,6 +265,13 @@ int sbi_remote_hfence_gvma(const cpumask_t *cpu_mask,
vaddr_t start,
cpu_mask, start, size, 0, 0);
}
+int sbi_remote_hfence_gvma_vmid(const cpumask_t *cpu_mask, vaddr_t start,
+ size_t size, unsigned long vmid)
+{
+ return sbi_rfence(SBI_EXT_RFENCE_REMOTE_HFENCE_GVMA_VMID,
+ cpu_mask, start, size, vmid, 0);
+}
+
/* This function must always succeed. */
#define sbi_get_spec_version() \
sbi_ext_base_func(SBI_EXT_BASE_GET_SPEC_VERSION)
--
2.50.1
