linux-kernel - [PATCH v2 04/13] powerpc/pseries/svm: Add helpers for UV_SHARE_PAGE and UV_UNSHARE

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Message-Id: <20190713060023.8479-5-bauerman@linux.ibm.com>
Date:   Sat, 13 Jul 2019 03:00:14 -0300
From:   Thiago Jung Bauermann <bauerman@...ux.ibm.com>
To:     linuxppc-dev@...ts.ozlabs.org
Cc:     linux-kernel@...r.kernel.org, Alexey Kardashevskiy <aik@...abs.ru>,
        Anshuman Khandual <anshuman.linux@...il.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Christoph Hellwig <hch@....de>,
        Michael Ellerman <mpe@...erman.id.au>,
        Mike Anderson <andmike@...ux.ibm.com>,
        Paul Mackerras <paulus@...ba.org>,
        Ram Pai <linuxram@...ibm.com>,
        Claudio Carvalho <cclaudio@...ux.ibm.com>,
        Thiago Jung Bauermann <bauerman@...ux.ibm.com>
Subject: [PATCH v2 04/13] powerpc/pseries/svm: Add helpers for UV_SHARE_PAGE and UV_UNSHARE_PAGE

From: Ram Pai <linuxram@...ibm.com>

These functions are used when the guest wants to grant the hypervisor
access to certain pages.

Signed-off-by: Ram Pai <linuxram@...ibm.com>
Signed-off-by: Thiago Jung Bauermann <bauerman@...ux.ibm.com>
---
 arch/powerpc/include/asm/ultravisor-api.h |  2 ++
 arch/powerpc/include/asm/ultravisor.h     | 15 +++++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/arch/powerpc/include/asm/ultravisor-api.h b/arch/powerpc/include/asm/ultravisor-api.h
index fe9a0d8d7673..c7513bbadf57 100644
--- a/arch/powerpc/include/asm/ultravisor-api.h
+++ b/arch/powerpc/include/asm/ultravisor-api.h
@@ -25,6 +25,8 @@
 #define UV_UNREGISTER_MEM_SLOT		0xF124
 #define UV_PAGE_IN			0xF128
 #define UV_PAGE_OUT			0xF12C
+#define UV_SHARE_PAGE			0xF130
+#define UV_UNSHARE_PAGE			0xF134
 #define UV_PAGE_INVAL			0xF138
 #define UV_SVM_TERMINATE		0xF13C
 
diff --git a/arch/powerpc/include/asm/ultravisor.h b/arch/powerpc/include/asm/ultravisor.h
index f5dc5af739b8..f7418b663a0e 100644
--- a/arch/powerpc/include/asm/ultravisor.h
+++ b/arch/powerpc/include/asm/ultravisor.h
@@ -91,6 +91,21 @@ static inline int uv_svm_terminate(u64 lpid)
 
 	return ucall(UV_SVM_TERMINATE, retbuf, lpid);
 }
+
+static inline int uv_share_page(u64 pfn, u64 npages)
+{
+	unsigned long retbuf[UCALL_BUFSIZE];
+
+	return ucall(UV_SHARE_PAGE, retbuf, pfn, npages);
+}
+
+static inline int uv_unshare_page(u64 pfn, u64 npages)
+{
+	unsigned long retbuf[UCALL_BUFSIZE];
+
+	return ucall(UV_UNSHARE_PAGE, retbuf, pfn, npages);
+}
+
 #endif /* !__ASSEMBLY__ */
 
 #endif	/* _ASM_POWERPC_ULTRAVISOR_H */