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Avoid address_space_rw() with a constant is_write argument

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The address_space_rw() function allows either reads or writes
depending on the is_write argument passed to it; this is useful
when the direction of the access is determined programmatically
(as for instance when handling the KVM_EXIT_MMIO exit reason).
Under the hood it just calls either address_space_write() or
address_space_read_full().

We also use it a lot with a constant is_write argument, though,
which has two issues:
 * when reading "address_space_rw(..., 1)" this is less
   immediately clear to the reader as being a write than
   "address_space_write(...)"
 * calling address_space_rw() bypasses the optimization
   in address_space_read() that fast-paths reads of a
   fixed length

This commit was produced with the included Coccinelle script
scripts/coccinelle/exec_rw_const.cocci.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Reviewed-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Acked-by: David Gibson <david@gibson.dropbear.id.au>
Message-Id: <20200218112457.22712-1-peter.maydell@linaro.org>
[PMD: Update macvm_set_cr0() reported by Laurent Vivier]
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
This commit is contained in:
Peter Maydell 2020-02-18 11:24:57 +00:00 • committed by Philippe Mathieu-Daudé
parent 1ccda935d4
commit 19f7034773
13 changed files with 119 additions and 107 deletions
Download patch file Download diff file Expand all files Collapse all files

7
target/i386/hvf/vmx.h
View file

@ -125,10 +125,9 @@ static inline void macvm_set_cr0(hv_vcpuid_t vcpu, uint64_t cr0)
if ((cr0 & CR0_PG) && (rvmcs(vcpu, VMCS_GUEST_CR4) & CR4_PAE) &&
!(efer & MSR_EFER_LME)) {
address_space_rw(&address_space_memory,
rvmcs(vcpu, VMCS_GUEST_CR3) & ~0x1f,
MEMTXATTRS_UNSPECIFIED,
pdpte, 32, false);
address_space_read(&address_space_memory,
rvmcs(vcpu, VMCS_GUEST_CR3) & ~0x1f,
MEMTXATTRS_UNSPECIFIED, pdpte, 32);
/* Only set PDPTE when appropriate. */
for (i = 0; i < 4; i++) {
wvmcs(vcpu, VMCS_GUEST_PDPTE0 + i * 2, pdpte[i]);

12
target/i386/hvf/x86_mmu.c
View file

@ -88,8 +88,8 @@ static bool get_pt_entry(struct CPUState *cpu, struct gpt_translation *pt,
}
index = gpt_entry(pt->gva, level, pae);
address_space_rw(&address_space_memory, gpa + index * pte_size(pae),
MEMTXATTRS_UNSPECIFIED, &pte, pte_size(pae), false);
address_space_read(&address_space_memory, gpa + index * pte_size(pae),
MEMTXATTRS_UNSPECIFIED, &pte, pte_size(pae));
pt->pte[level - 1] = pte;
@ -238,8 +238,8 @@ void vmx_write_mem(struct CPUState *cpu, target_ulong gva, void *data, int bytes
if (!mmu_gva_to_gpa(cpu, gva, &gpa)) {
VM_PANIC_EX("%s: mmu_gva_to_gpa %llx failed\n", __func__, gva);
} else {
address_space_rw(&address_space_memory, gpa,
MEMTXATTRS_UNSPECIFIED, data, copy, true);
address_space_write(&address_space_memory, gpa,
MEMTXATTRS_UNSPECIFIED, data, copy);
}
bytes -= copy;
@ -259,8 +259,8 @@ void vmx_read_mem(struct CPUState *cpu, void *data, target_ulong gva, int bytes)
if (!mmu_gva_to_gpa(cpu, gva, &gpa)) {
VM_PANIC_EX("%s: mmu_gva_to_gpa %llx failed\n", __func__, gva);
}
address_space_rw(&address_space_memory, gpa, MEMTXATTRS_UNSPECIFIED,
data, copy, false);
address_space_read(&address_space_memory, gpa, MEMTXATTRS_UNSPECIFIED,
data, copy);
bytes -= copy;
gva += copy;