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qemu/0047-exec-add-ram_debug_ops-support.patch
Bruce Rogers f3c3b22dd7 Accepting request 574394 from home:bfrogers:branches:Virtualization 
- Add AMD SEV (Secure Encrypted Virtualization) support by taking the v7 series of the patches posted to qemu ml. (fate#322124)
- Update python3 related patches now that they are upstream

OBS-URL: https://build.opensuse.org/request/show/574394
OBS-URL: https://build.opensuse.org/package/show/Virtualization/qemu?expand=0&rev=390
2018-02-08 19:55:31 +00:00

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From faf4862946a9e236e8e4fb956adad2dc11577fe0 Mon Sep 17 00:00:00 2001
From: Brijesh Singh <brijesh.singh@amd.com>
Date: Tue, 6 Feb 2018 19:08:07 -0600
Subject: [PATCH] exec: add ram_debug_ops support
Currently, the guest memory access for the debug purpose is performed
using the memcpy(). Lets extend the 'struct MemoryRegion' to include
ram_debug_ops callbacks. The ram_debug_ops can be used to override
memcpy() with something else.
The feature can be used by encrypted guest -- which can register
callbacks to override memcpy() with memory encryption/decryption APIs.
a typical usage:
mem_read(uint8_t *dst, uint8_t *src, uint32_t len, MemTxAttrs *attrs);
mem_write(uint8_t *dst, uint8_t *src, uint32_t len, MemTxAttrs *attrs);
MemoryRegionRAMReadWriteOps ops;
ops.read = mem_read;
ops.write = mem_write;
memory_region_init_ram(mem, NULL, "memory", size, NULL);
memory_region_set_ram_debug_ops(mem, ops);
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Peter Crosthwaite <crosthwaite.peter@gmail.com>
Cc: Richard Henderson <rth@twiddle.net>
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
[BR: FATE#322124]
Signed-off-by: Bruce Rogers <brogers@suse.com>
---
exec.c | 66 ++++++++++++++++++++++++++++++++++++++-------------
include/exec/memory.h | 28 ++++++++++++++++++++++
2 files changed, 78 insertions(+), 16 deletions(-)
diff --git a/exec.c b/exec.c
index 1ca0f9e0ab..5da6a782e1 100644
--- a/exec.c
+++ b/exec.c
@@ -2983,7 +2983,11 @@ static MemTxResult flatview_write_continue(FlatView *fv, hwaddr addr,
} else {
/* RAM case */
ptr = qemu_ram_ptr_length(mr->ram_block, addr1, &l, false);
- memcpy(ptr, buf, l);
+ if (attrs.debug && mr->ram_debug_ops) {
+ mr->ram_debug_ops->write(ptr, buf, l, attrs);
+ } else {
+ memcpy(ptr, buf, l);
+ }
invalidate_and_set_dirty(mr, addr1, l);
}
@@ -3081,7 +3085,11 @@ MemTxResult flatview_read_continue(FlatView *fv, hwaddr addr,
} else {
/* RAM case */
ptr = qemu_ram_ptr_length(mr->ram_block, addr1, &l, false);
- memcpy(buf, ptr, l);
+ if (attrs.debug && mr->ram_debug_ops) {
+ mr->ram_debug_ops->read(buf, ptr, l, attrs);
+ } else {
+ memcpy(buf, ptr, l);
+ }
}
if (release_lock) {
@@ -3151,11 +3159,13 @@ void cpu_physical_memory_rw(hwaddr addr, uint8_t *buf,
enum write_rom_type {
WRITE_DATA,
+ READ_DATA,
FLUSH_CACHE,
};
-static inline void cpu_physical_memory_write_rom_internal(AddressSpace *as,
- hwaddr addr, const uint8_t *buf, int len, enum write_rom_type type)
+static inline void cpu_physical_memory_rw_internal(AddressSpace *as,
+ hwaddr addr, uint8_t *buf, int len, MemTxAttrs attrs,
+ enum write_rom_type type)
{
hwaddr l;
uint8_t *ptr;
@@ -3170,12 +3180,33 @@ static inline void cpu_physical_memory_write_rom_internal(AddressSpace *as,
if (!(memory_region_is_ram(mr) ||
memory_region_is_romd(mr))) {
l = memory_access_size(mr, l, addr1);
+ /* Pass MMIO down to address address_space_rw */
+ switch (type) {
+ case READ_DATA:
+ case WRITE_DATA:
+ address_space_rw(as, addr1, attrs, buf, l,
+ type == WRITE_DATA);
+ break;
+ case FLUSH_CACHE:
+ break;
+ }
} else {
/* ROM/RAM case */
ptr = qemu_map_ram_ptr(mr->ram_block, addr1);
switch (type) {
+ case READ_DATA:
+ if (mr->ram_debug_ops) {
+ mr->ram_debug_ops->read(buf, ptr, l, attrs);
+ } else {
+ memcpy(buf, ptr, l);
+ }
+ break;
case WRITE_DATA:
- memcpy(ptr, buf, l);
+ if (mr->ram_debug_ops) {
+ mr->ram_debug_ops->write(ptr, buf, l, attrs);
+ } else {
+ memcpy(ptr, buf, l);
+ }
invalidate_and_set_dirty(mr, addr1, l);
break;
case FLUSH_CACHE:
@@ -3194,7 +3225,8 @@ static inline void cpu_physical_memory_write_rom_internal(AddressSpace *as,
void cpu_physical_memory_write_rom(AddressSpace *as, hwaddr addr,
const uint8_t *buf, int len)
{
- cpu_physical_memory_write_rom_internal(as, addr, buf, len, WRITE_DATA);
+ cpu_physical_memory_rw_internal(as, addr, (uint8_t *)buf, len,
+ MEMTXATTRS_UNSPECIFIED, WRITE_DATA);
}
void cpu_flush_icache_range(hwaddr start, int len)
@@ -3209,8 +3241,10 @@ void cpu_flush_icache_range(hwaddr start, int len)
return;
}
- cpu_physical_memory_write_rom_internal(&address_space_memory,
- start, NULL, len, FLUSH_CACHE);
+ cpu_physical_memory_rw_internal(&address_space_memory,
+ start, NULL, len,
+ MEMTXATTRS_UNSPECIFIED,
+ FLUSH_CACHE);
}
typedef struct {
@@ -3516,6 +3550,7 @@ int cpu_memory_rw_debug(CPUState *cpu, target_ulong addr,
int l;
hwaddr phys_addr;
target_ulong page;
+ int type = is_write ? WRITE_DATA : READ_DATA;
cpu_synchronize_state(cpu);
while (len > 0) {
@@ -3525,6 +3560,10 @@ int cpu_memory_rw_debug(CPUState *cpu, target_ulong addr,
page = addr & TARGET_PAGE_MASK;
phys_addr = cpu_get_phys_page_attrs_debug(cpu, page, &attrs);
asidx = cpu_asidx_from_attrs(cpu, attrs);
+
+ /* set debug attrs to indicate memory access is from the debugger */
+ attrs.debug = 1;
+
/* if no physical page mapped, return an error */
if (phys_addr == -1)
return -1;
@@ -3532,14 +3571,9 @@ int cpu_memory_rw_debug(CPUState *cpu, target_ulong addr,
if (l > len)
l = len;
phys_addr += (addr & ~TARGET_PAGE_MASK);
- if (is_write) {
- cpu_physical_memory_write_rom(cpu->cpu_ases[asidx].as,
- phys_addr, buf, l);
- } else {
- address_space_rw(cpu->cpu_ases[asidx].as, phys_addr,
- MEMTXATTRS_UNSPECIFIED,
- buf, l, 0);
- }
+ cpu_physical_memory_rw_internal(cpu->cpu_ases[asidx].as,
+ phys_addr, buf, l, attrs,
+ type);
len -= l;
buf += l;
addr += l;
diff --git a/include/exec/memory.h b/include/exec/memory.h
index 5ed4042f87..557f75c7ae 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -215,6 +215,18 @@ typedef struct IOMMUMemoryRegionClass {
typedef struct CoalescedMemoryRange CoalescedMemoryRange;
typedef struct MemoryRegionIoeventfd MemoryRegionIoeventfd;
+/* Memory Region RAM debug callback */
+typedef struct MemoryRegionRAMReadWriteOps MemoryRegionRAMReadWriteOps;
+
+struct MemoryRegionRAMReadWriteOps {
+ /* Write data into guest memory */
+ int (*write) (uint8_t *dest, const uint8_t *src,
+ uint32_t len, MemTxAttrs attrs);
+ /* Read data from guest memory */
+ int (*read) (uint8_t *dest, const uint8_t *src,
+ uint32_t len, MemTxAttrs attrs);
+};
+
struct MemoryRegion {
Object parent_obj;
@@ -254,6 +266,7 @@ struct MemoryRegion {
const char *name;
unsigned ioeventfd_nb;
MemoryRegionIoeventfd *ioeventfds;
+ const MemoryRegionRAMReadWriteOps *ram_debug_ops;
};
struct IOMMUMemoryRegion {
@@ -620,6 +633,21 @@ void memory_region_init_rom_device_nomigrate(MemoryRegion *mr,
uint64_t size,
Error **errp);
+/**
+ * memory_region_set_ram_debug_ops: Set debug access ops for a given memory
+ * region.
+ *
+ * @mr: the #MemoryRegion to be initialized
+ * @ops: a function that will be used for when accessing @target region during
+ * debug
+ */
+static inline void
+memory_region_set_ram_debug_ops(MemoryRegion *mr,
+ const MemoryRegionRAMReadWriteOps *ops)
+{
+ mr->ram_debug_ops = ops;
+}
+
/**
* memory_region_init_reservation: Initialize a memory region that reserves
* I/O space.
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