[PATCH][UPDATE] kvm-userspace: simplify mmio callback

[Christian Ehrhardt <ehrhardt-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>]

Subject: [PATCH][UPDATE] kvm-userspace: simplify mmio callback
From: Christian Ehrhardt <ehrhardt-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>

Merging the read[bwlq]/write[bwlq] callback callback pointers to 
mmio_read/write functions simplifies the callback interface.
On the qemu side it now uses the cpu_physical_memory_rw function.
Additonally this patch merges the RedHat 7.1 mmio workaround that
was spread to two code locations.

Signed-off-by: Christian Ehrhardt <ehrhardt-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>

diff --git a/libkvm/libkvm.c b/libkvm/libkvm.c
index 93d7b6b..fd93f44 100644
--- a/libkvm/libkvm.c
+++ b/libkvm/libkvm.c
@@ -826,44 +826,17 @@ static int handle_mmio(kvm_context_t kvm, struct kvm_run *kvm_run)
 {
 	unsigned long addr = kvm_run->mmio.phys_addr;
 	void *data = kvm_run->mmio.data;
-	int r = -1;
 
-	/* hack: Red Hat 7.1 generates these wierd accesses. */
-	if (addr == 0xa0000 && kvm_run->mmio.len == 3)
+	/* hack: Red Hat 7.1 generates these weird accesses. */
+	if ((addr > 0xa0000-4 && addr <= 0xa0000) && kvm_run->mmio.len == 3)
 	    return 0;
 
-	if (kvm_run->mmio.is_write) {
-		switch (kvm_run->mmio.len) {
-		case 1:
-			r = kvm->callbacks->writeb(kvm->opaque, addr, *(uint8_t *)data);
-			break;
-		case 2:
-			r = kvm->callbacks->writew(kvm->opaque, addr, *(uint16_t *)data);
-			break;
-		case 4:
-			r = kvm->callbacks->writel(kvm->opaque, addr, *(uint32_t *)data);
-			break;
-		case 8:
-			r = kvm->callbacks->writeq(kvm->opaque, addr, *(uint64_t *)data);
-			break;
-		}
-	} else {
-		switch (kvm_run->mmio.len) {
-		case 1:
-			r = kvm->callbacks->readb(kvm->opaque, addr, (uint8_t *)data);
-			break;
-		case 2:
-			r = kvm->callbacks->readw(kvm->opaque, addr, (uint16_t *)data);
-			break;
-		case 4:
-			r = kvm->callbacks->readl(kvm->opaque, addr, (uint32_t *)data);
-			break;
-		case 8:
-			r = kvm->callbacks->readq(kvm->opaque, addr, (uint64_t *)data);
-			break;
-		}
-	}
-	return r;
+	if (kvm_run->mmio.is_write)
+		return kvm->callbacks->mmio_write(kvm->opaque, addr, data,
+					kvm_run->mmio.len);
+	else
+		return kvm->callbacks->mmio_read(kvm->opaque, addr, data,
+					kvm_run->mmio.len);
 }
 
 int handle_io_window(kvm_context_t kvm)
diff --git a/libkvm/libkvm.h b/libkvm/libkvm.h
index 110912a..62407f5 100644
--- a/libkvm/libkvm.h
+++ b/libkvm/libkvm.h
@@ -45,22 +45,12 @@ struct kvm_callbacks {
     int (*outw)(void *opaque, uint16_t addr, uint16_t data);
 	/// For 32bit IO writes from the guest (Usually when executing 'outl')
     int (*outl)(void *opaque, uint16_t addr, uint32_t data);
-	/// For 8bit memory reads from unmapped memory (For MMIO devices)
-    int (*readb)(void *opaque, uint64_t addr, uint8_t *data);
-	/// For 16bit memory reads from unmapped memory (For MMIO devices)
-    int (*readw)(void *opaque, uint64_t addr, uint16_t *data);
-	/// For 32bit memory reads from unmapped memory (For MMIO devices)
-    int (*readl)(void *opaque, uint64_t addr, uint32_t *data);
-	/// For 64bit memory reads from unmapped memory (For MMIO devices)
-    int (*readq)(void *opaque, uint64_t addr, uint64_t *data);
-	/// For 8bit memory writes to unmapped memory (For MMIO devices)
-    int (*writeb)(void *opaque, uint64_t addr, uint8_t data);
-	/// For 16bit memory writes to unmapped memory (For MMIO devices)
-    int (*writew)(void *opaque, uint64_t addr, uint16_t data);
-	/// For 32bit memory writes to unmapped memory (For MMIO devices)
-    int (*writel)(void *opaque, uint64_t addr, uint32_t data);
-	/// For 64bit memory writes to unmapped memory (For MMIO devices)
-    int (*writeq)(void *opaque, uint64_t addr, uint64_t data);
+	/// generic memory reads to unmapped memory (For MMIO devices)
+    int (*mmio_read)(void *opaque, uint64_t addr, uint8_t *data,
+					int len);
+	/// generic memory writes to unmapped memory (For MMIO devices)
+    int (*mmio_write)(void *opaque, uint64_t addr, uint8_t *data,
+					int len);
     int (*debug)(void *opaque, int vcpu);
 	/*!
 	 * \brief Called when the VCPU issues an 'hlt' instruction.
diff --git a/qemu/qemu-kvm.c b/qemu/qemu-kvm.c
index cc47ca2..8027ed1 100644
--- a/qemu/qemu-kvm.c
+++ b/qemu/qemu-kvm.c
@@ -477,58 +477,18 @@ static int kvm_outl(void *opaque, uint16_t addr, uint32_t data)
     return 0;
 }
 
-static int kvm_readb(void *opaque, uint64_t addr, uint8_t *data)
+static int kvm_mmio_read(void *opaque, uint64_t addr,
+					uint8_t *data, int len, int is_write)
 {
-    *data = ldub_phys(addr);
-    return 0;
-}
- 
-static int kvm_readw(void *opaque, uint64_t addr, uint16_t *data)
-{
-    *data = lduw_phys(addr);
-    return 0;
-}
-
-static int kvm_readl(void *opaque, uint64_t addr, uint32_t *data)
-{
-    /* hack: Red Hat 7.1 generates some wierd accesses. */
-    if (addr > 0xa0000 - 4 && addr < 0xa0000) {
-	*data = 0;
+	cpu_physical_memory_rw(addr, data, len, 0);
 	return 0;
-    }
-
-    *data = ldl_phys(addr);
-    return 0;
-}
-
-static int kvm_readq(void *opaque, uint64_t addr, uint64_t *data)
-{
-    *data = ldq_phys(addr);
-    return 0;
 }
 
-static int kvm_writeb(void *opaque, uint64_t addr, uint8_t data)
+static int kvm_mmio_write(void *opaque, uint64_t addr,
+					uint8_t *data, int len, int is_write)
 {
-    stb_phys(addr, data);
-    return 0;
-}
-
-static int kvm_writew(void *opaque, uint64_t addr, uint16_t data)
-{
-    stw_phys(addr, data);
-    return 0;
-}
-
-static int kvm_writel(void *opaque, uint64_t addr, uint32_t data)
-{
-    stl_phys(addr, data);
-    return 0;
-}
-
-static int kvm_writeq(void *opaque, uint64_t addr, uint64_t data)
-{
-    stq_phys(addr, data);
-    return 0;
+	cpu_physical_memory_rw(addr, data, len, 1);
+	return 0;
 }
 
 static int kvm_io_window(void *opaque)
@@ -556,14 +516,8 @@ static struct kvm_callbacks qemu_kvm_ops = {
     .outb  = kvm_outb,
     .outw  = kvm_outw,
     .outl  = kvm_outl,
-    .readb = kvm_readb,
-    .readw = kvm_readw,
-    .readl = kvm_readl,
-    .readq = kvm_readq,
-    .writeb = kvm_writeb,
-    .writew = kvm_writew,
-    .writel = kvm_writel,
-    .writeq = kvm_writeq,
+    .mmio_read = kvm_mmio_read,
+    .mmio_write = kvm_mmio_write,
     .halt  = kvm_halt,
     .shutdown = kvm_shutdown,
     .io_window = kvm_io_window,
diff --git a/user/main.c b/user/main.c
index 213b019..4d870fa 100644
--- a/user/main.c
+++ b/user/main.c
@@ -366,7 +366,7 @@ static int test_pre_kvm_run(void *opaque, int vcpu)
 	return 0;
 }
 
-static int test_mem_read(uint64_t addr, void *data, unsigned len)
+static int test_mem_read(void *opaque, uint64_t addr, void *data, unsigned len)
 {
 	if (addr < IORAM_BASE_PHYS || addr + len > IORAM_BASE_PHYS + IORAM_LEN)
 		return 1;
@@ -374,7 +374,7 @@ static int test_mem_read(uint64_t addr, void *data, unsigned len)
 	return 0;
 }
 
-static int test_mem_write(uint64_t addr, void *data, unsigned len)
+static int test_mem_write(void *opaque, uint64_t addr, void *data, unsigned len)
 {
 	if (addr < IORAM_BASE_PHYS || addr + len > IORAM_BASE_PHYS + IORAM_LEN)
 		return 1;
@@ -382,46 +382,6 @@ static int test_mem_write(uint64_t addr, void *data, unsigned len)
 	return 0;
 }
 
-static int test_readb(void *opaque, uint64_t addr, uint8_t *data)
-{
-	return test_mem_read(addr, data, 1);
-}
-
-static int test_readw(void *opaque, uint64_t addr, uint16_t *data)
-{
-	return test_mem_read(addr, data, 2);
-}
-
-static int test_readl(void *opaque, uint64_t addr, uint32_t *data)
-{
-	return test_mem_read(addr, data, 4);
-
-}
-static int test_readq(void *opaque, uint64_t addr, uint64_t *data)
-{
-	return test_mem_read(addr, data, 8);
-}
-
-static int test_writeb(void *opaque, uint64_t addr, uint8_t data)
-{
-	return test_mem_write(addr, &data, 1);
-}
-
-static int test_writew(void *opaque, uint64_t addr, uint16_t data)
-{
-	return test_mem_write(addr, &data, 2);
-}
-
-static int test_writel(void *opaque, uint64_t addr, uint32_t data)
-{
-	return test_mem_write(addr, &data, 4);
-}
-
-static int test_writeq(void *opaque, uint64_t addr, uint64_t data)
-{
-	return test_mem_write(addr, &data, 8);
-}
-
 static struct kvm_callbacks test_callbacks = {
 	.inb         = test_inb,
 	.inw         = test_inw,
@@ -429,14 +389,8 @@ static struct kvm_callbacks test_callbacks = {
 	.outb        = test_outb,
 	.outw        = test_outw,
 	.outl        = test_outl,
-	.readb       = test_readb,
-	.readw       = test_readw,
-	.readl       = test_readl,
-	.readq       = test_readq,
-	.writeb      = test_writeb,
-	.writew      = test_writew,
-	.writel      = test_writel,
-	.writeq      = test_writeq,
+	.mmio_read   = test_mem_read,
+	.mmio_write  = test_mem_write,
 	.debug       = test_debug,
 	.halt        = test_halt,
 	.io_window = test_io_window,

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