linux-kernel - [PATCH 04/12] powerpc/pseries/svm: Add helpers for UV_SHARE_PAGE and UV_UNSHARE

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Date:   Tue, 21 May 2019 01:49:04 -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 04/12] 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     | 14 ++++++++++++++
 2 files changed, 16 insertions(+)

diff --git a/arch/powerpc/include/asm/ultravisor-api.h b/arch/powerpc/include/asm/ultravisor-api.h
index 0e8b72081718..ed68b02869fd 100644
--- a/arch/powerpc/include/asm/ultravisor-api.h
+++ b/arch/powerpc/include/asm/ultravisor-api.h
@@ -20,6 +20,8 @@
 /* opcodes */
 #define UV_WRITE_PATE			0xF104
 #define UV_ESM				0xF110
+#define UV_SHARE_PAGE			0xF130
+#define UV_UNSHARE_PAGE			0xF134
 #define UV_RETURN			0xF11C
 
 #endif /* _ASM_POWERPC_ULTRAVISOR_API_H */
diff --git a/arch/powerpc/include/asm/ultravisor.h b/arch/powerpc/include/asm/ultravisor.h
index 09e0a615d96f..537f7717d21a 100644
--- a/arch/powerpc/include/asm/ultravisor.h
+++ b/arch/powerpc/include/asm/ultravisor.h
@@ -44,6 +44,20 @@ static inline int uv_register_pate(u64 lpid, u64 dw0, u64 dw1)
 	return ucall(UV_WRITE_PATE, retbuf, lpid, dw0, dw1);
 }
 
+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 */