target/i386/mshv: use the register page to set registers
Update mshv_store_regs to use the register page when it is mmapped and valid to set registers. Otherwise use the ioctls to set the registers. Signed-off-by: Doru Blânzeanu <dblanzeanu@linux.microsoft.com> Reviewed-By: Magnus Kulke <magnuskulke@linux.microsoft.com> Reviewed-by: Mohamed Mediouni <mohamed@unpredictable.fr> Link: https://lore.kernel.org/r/20260428135053.251200-7-dblanzeanu@linux.microsoft.com Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Doru Blânzeanu committed
Apr 28, 2026 at 16:50 UTC
80c7f8e9cd17b1dfa2eb913293aa91c78884ede8
1 file changed
+40
-4
target/i386/mshv/mshv-cpu.c
+40
-4
@@ -457,14 +457,50 @@ static int set_standard_regs(const CPUState *cpu)
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return 0;
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}
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+static void mshv_set_standard_regs_vp_page(CPUState *cpu)
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+{
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+ X86CPU *x86cpu = X86_CPU(cpu);
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+ CPUX86State *env = &x86cpu->env;
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+
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+ env->regs_page->rax = env->regs[R_EAX];
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+ env->regs_page->rbx = env->regs[R_EBX];
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+ env->regs_page->rcx = env->regs[R_ECX];
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+ env->regs_page->rdx = env->regs[R_EDX];
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+ env->regs_page->rsi = env->regs[R_ESI];
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+ env->regs_page->rdi = env->regs[R_EDI];
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+ env->regs_page->rsp = env->regs[R_ESP];
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+ env->regs_page->rbp = env->regs[R_EBP];
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+ env->regs_page->r8 = env->regs[R_R8];
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+ env->regs_page->r9 = env->regs[R_R9];
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+ env->regs_page->r10 = env->regs[R_R10];
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+ env->regs_page->r11 = env->regs[R_R11];
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+ env->regs_page->r12 = env->regs[R_R12];
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+ env->regs_page->r13 = env->regs[R_R13];
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+ env->regs_page->r14 = env->regs[R_R14];
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+ env->regs_page->r15 = env->regs[R_R15];
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+ env->regs_page->rip = env->eip;
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+ lflags_to_rflags(env);
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+ env->regs_page->rflags = env->eflags;
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+
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+ env->regs_page->dirty |= (1u << HV_X64_REGISTER_CLASS_GENERAL)
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+ | (1u << HV_X64_REGISTER_CLASS_IP)
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+ | (1u << HV_X64_REGISTER_CLASS_FLAGS);
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+}
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+
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static int store_regs(CPUState *cpu)
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{
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+ X86CPU *x86cpu = X86_CPU(cpu);
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+ CPUX86State *env = &x86cpu->env;
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int ret;
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- ret = set_standard_regs(cpu);
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- if (ret < 0) {
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- error_report("Failed to store standard registers");
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- return -1;
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+ /* Use register vp page to optimize registers access */
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+ if (env->regs_page && env->regs_page->isvalid != 0) {
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+ mshv_set_standard_regs_vp_page(cpu);
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+ } else {
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+ ret = set_standard_regs(cpu);
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+ if (ret < 0) {
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+ return ret;
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+ }
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}
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ret = set_special_regs(cpu);