[PATCH] vmx: Introduce vcpu single context VPID invalidation

["Teddy Astie" <teddy.astie@xxxxxxxxxx>]

Introduce vpid_sync_vcpu_context to do a single-context invalidation
on the vpid attached to the vcpu as a alternative to per-gva and all-contexts
invlidations.

Signed-off-by: Teddy Astie <teddy.astie@xxxxxxxxxx>
---
Extracted from SEV series.
This will be used for instance in fixed-ASID patches (in SEV series).
---
 xen/arch/x86/include/asm/hvm/vmx/vmx.h | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/xen/arch/x86/include/asm/hvm/vmx/vmx.h 
b/xen/arch/x86/include/asm/hvm/vmx/vmx.h
index d85b52b9d5..1269c318dc 100644
--- a/xen/arch/x86/include/asm/hvm/vmx/vmx.h
+++ b/xen/arch/x86/include/asm/hvm/vmx/vmx.h
@@ -451,6 +451,23 @@ static inline void ept_sync_all(void)
 
 void ept_sync_domain(struct p2m_domain *p2m);
 
+static inline void vpid_sync_vcpu_context(struct vcpu *v)
+{
+    int type = INVVPID_SINGLE_CONTEXT;
+
+    /*
+     * If single context invalidation is not supported, we escalate to
+     * use all context invalidation.
+     */
+    if ( likely(cpu_has_vmx_vpid_invvpid_single_context) )
+        goto execute_invvpid;
+
+    type = INVVPID_ALL_CONTEXT;
+
+execute_invvpid:
+    __invvpid(type, v->arch.hvm.n1asid.asid, 0);
+}
+
 static inline void vpid_sync_vcpu_gva(struct vcpu *v, unsigned long gva)
 {
     int type = INVVPID_INDIVIDUAL_ADDR;
-- 
2.49.0



Teddy Astie | Vates XCP-ng Developer

XCP-ng & Xen Orchestra - Vates solutions

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